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terminal.c

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

#include <time.h>
#include <assert.h>
#include "putty.h"
#include "terminal.h"

#define poslt(p1,p2) ( (p1).y < (p2).y || ( (p1).y == (p2).y && (p1).x < (p2).x ) )
#define posle(p1,p2) ( (p1).y < (p2).y || ( (p1).y == (p2).y && (p1).x <= (p2).x ) )
#define poseq(p1,p2) ( (p1).y == (p2).y && (p1).x == (p2).x )
#define posdiff(p1,p2) ( ((p1).y - (p2).y) * (term->cols+1) + (p1).x - (p2).x )

/* Product-order comparisons for rectangular block selection. */
#define posPlt(p1,p2) ( (p1).y <= (p2).y && (p1).x < (p2).x )
#define posPle(p1,p2) ( (p1).y <= (p2).y && (p1).x <= (p2).x )

#define incpos(p) ( (p).x == term->cols ? ((p).x = 0, (p).y++, 1) : ((p).x++, 0) )
#define decpos(p) ( (p).x == 0 ? ((p).x = term->cols, (p).y--, 1) : ((p).x--, 0) )

#define VT52_PLUS

#define CL_ANSIMIN      0x0001             /* Codes in all ANSI like terminals. */
#define CL_VT100  0x0002             /* VT100 */
#define CL_VT100AVO     0x0004             /* VT100 +AVO; 132x24 (not 132x14) & attrs */
#define CL_VT102  0x0008             /* VT102 */
#define CL_VT220  0x0010             /* VT220 */
#define CL_VT320  0x0020             /* VT320 */
#define CL_VT420  0x0040             /* VT420 */
#define CL_VT510  0x0080             /* VT510, NB VT510 includes ANSI */
#define CL_VT340TEXT    0x0100             /* VT340 extensions that appear in the VT420 */
#define CL_SCOANSI      0x1000             /* SCOANSI not in ANSIMIN. */
#define CL_ANSI         0x2000             /* ANSI ECMA-48 not in the VT100..VT420 */
#define CL_OTHER  0x4000             /* Others, Xterm, linux, putty, dunno, etc */

#define TM_VT100  (CL_ANSIMIN|CL_VT100)
#define TM_VT100AVO     (TM_VT100|CL_VT100AVO)
#define TM_VT102  (TM_VT100AVO|CL_VT102)
#define TM_VT220  (TM_VT102|CL_VT220)
#define TM_VTXXX  (TM_VT220|CL_VT340TEXT|CL_VT510|CL_VT420|CL_VT320)
#define TM_SCOANSI      (CL_ANSIMIN|CL_SCOANSI)

#define TM_PUTTY  (0xFFFF)

#define compatibility(x) \
    if ( ((CL_##x)&term->compatibility_level) == 0 ) {      \
       term->termstate=TOPLEVEL;                \
       break;                                   \
    }
#define compatibility2(x,y) \
    if ( ((CL_##x|CL_##y)&term->compatibility_level) == 0 ) { \
       term->termstate=TOPLEVEL;                \
       break;                                   \
    }

#define has_compat(x) ( ((CL_##x)&term->compatibility_level) != 0 )

const char sco2ansicolour[] = { 0, 4, 2, 6, 1, 5, 3, 7 };

#define sel_nl_sz  (sizeof(sel_nl)/sizeof(wchar_t))
const wchar_t sel_nl[] = SEL_NL;

/*
 * Fetch the character at a particular position in a line array,
 * for purposes of `wordtype'. The reason this isn't just a simple
 * array reference is that if the character we find is UCSWIDE,
 * then we must look one space further to the left.
 */
#define UCSGET(a, x) \
    ( (x)>0 && ((a)[(x)] & (CHAR_MASK | CSET_MASK)) == UCSWIDE ? \
      (a)[(x)-1] : (a)[(x)] )

/*
 * Internal prototypes.
 */
static unsigned long *resizeline(unsigned long *, int);
static unsigned long *lineptr(Terminal *, int, int);
static void do_paint(Terminal *, Context, int);
static void erase_lots(Terminal *, int, int, int);
static void swap_screen(Terminal *, int, int, int);
static void update_sbar(Terminal *);
static void deselect(Terminal *);
static void term_print_finish(Terminal *);
#ifdef OPTIMISE_SCROLL
static void scroll_display(Terminal *, int, int, int);
#endif /* OPTIMISE_SCROLL */

/*
 * Resize a line to make it `cols' columns wide.
 */
static unsigned long *resizeline(unsigned long *line, int cols)
{
    int i, oldlen;
    unsigned long lineattrs;

    if (line[0] != (unsigned long)cols) {
      /*
       * This line is the wrong length, which probably means it
       * hasn't been accessed since a resize. Resize it now.
       */
      oldlen = line[0];
      lineattrs = line[oldlen + 1];
      line = sresize(line, 2 + cols, TTYPE);
      line[0] = cols;
      for (i = oldlen; i < cols; i++)
          line[i + 1] = ERASE_CHAR;
      line[cols + 1] = lineattrs & LATTR_MODE;
    }

    return line;
}

/*
 * Get the number of lines in the scrollback.
 */
static int sblines(Terminal *term)
{
    int sblines = count234(term->scrollback);
    if (term->cfg.erase_to_scrollback &&
      term->alt_which && term->alt_screen) {
          sblines += term->alt_sblines;
    }
    return sblines;
}

/*
 * Retrieve a line of the screen or of the scrollback, according to
 * whether the y coordinate is non-negative or negative
 * (respectively).
 */
static unsigned long *lineptr(Terminal *term, int y, int lineno)
{
    unsigned long *line, *newline;
    tree234 *whichtree;
    int treeindex;

    if (y >= 0) {
      whichtree = term->screen;
      treeindex = y;
    } else {
      int altlines = 0;
      if (term->cfg.erase_to_scrollback &&
          term->alt_which && term->alt_screen) {
          altlines = term->alt_sblines;
      }
      if (y < -altlines) {
          whichtree = term->scrollback;
          treeindex = y + altlines + count234(term->scrollback);
      } else {
          whichtree = term->alt_screen;
          treeindex = y + term->alt_sblines;
          /* treeindex = y + count234(term->alt_screen); */
      }
    }
    line = index234(whichtree, treeindex);

    /* We assume that we don't screw up and retrieve something out of range. */
    assert(line != NULL);

    newline = resizeline(line, term->cols);
    if (newline != line) {
      delpos234(whichtree, treeindex);
      addpos234(whichtree, newline, treeindex);
        line = newline;
    }

    return line + 1;
}

#define lineptr(x) lineptr(term,x,__LINE__)

/*
 * Set up power-on settings for the terminal.
 */
static void power_on(Terminal *term)
{
    term->curs.x = term->curs.y = 0;
    term->alt_x = term->alt_y = 0;
    term->savecurs.x = term->savecurs.y = 0;
    term->alt_t = term->marg_t = 0;
    if (term->rows != -1)
      term->alt_b = term->marg_b = term->rows - 1;
    else
      term->alt_b = term->marg_b = 0;
    if (term->cols != -1) {
      int i;
      for (i = 0; i < term->cols; i++)
          term->tabs[i] = (i % 8 == 0 ? TRUE : FALSE);
    }
    term->alt_om = term->dec_om = term->cfg.dec_om;
    term->alt_ins = term->insert = FALSE;
    term->alt_wnext = term->wrapnext = term->save_wnext = FALSE;
    term->alt_wrap = term->wrap = term->cfg.wrap_mode;
    term->alt_cset = term->cset = term->save_cset = 0;
    term->alt_utf = term->utf = term->save_utf = 0;
    term->utf_state = 0;
    term->alt_sco_acs = term->sco_acs = term->save_sco_acs = 0;
    term->cset_attr[0] = term->cset_attr[1] = term->save_csattr = ATTR_ASCII;
    term->rvideo = 0;
    term->in_vbell = FALSE;
    term->cursor_on = 1;
    term->big_cursor = 0;
    term->default_attr = term->save_attr = term->curr_attr = ATTR_DEFAULT;
    term->term_editing = term->term_echoing = FALSE;
    term->app_cursor_keys = term->cfg.app_cursor;
    term->app_keypad_keys = term->cfg.app_keypad;
    term->use_bce = term->cfg.bce;
    term->blink_is_real = term->cfg.blinktext;
    term->erase_char = ERASE_CHAR;
    term->alt_which = 0;
    term_print_finish(term);
    {
      int i;
      for (i = 0; i < 256; i++)
          term->wordness[i] = term->cfg.wordness[i];
    }
    if (term->screen) {
      swap_screen(term, 1, FALSE, FALSE);
      erase_lots(term, FALSE, TRUE, TRUE);
      swap_screen(term, 0, FALSE, FALSE);
      erase_lots(term, FALSE, TRUE, TRUE);
    }
}

/*
 * Force a screen update.
 */
void term_update(Terminal *term)
{
    Context ctx;
    ctx = get_ctx(term->frontend);
    if (ctx) {
      int need_sbar_update = term->seen_disp_event;
      if (term->seen_disp_event && term->cfg.scroll_on_disp) {
          term->disptop = 0;         /* return to main screen */
          term->seen_disp_event = 0;
          need_sbar_update = TRUE;
      }
      if (need_sbar_update)
          update_sbar(term);
      do_paint(term, ctx, TRUE);
      sys_cursor(term->frontend, term->curs.x, term->curs.y - term->disptop);
      free_ctx(ctx);
    }
}

/*
 * Called from front end when a keypress occurs, to trigger
 * anything magical that needs to happen in that situation.
 */
void term_seen_key_event(Terminal *term)
{
    /*
     * On any keypress, clear the bell overload mechanism
     * completely, on the grounds that large numbers of
     * beeps coming from deliberate key action are likely
     * to be intended (e.g. beeps from filename completion
     * blocking repeatedly).
     */
    term->beep_overloaded = FALSE;
    while (term->beephead) {
      struct beeptime *tmp = term->beephead;
      term->beephead = tmp->next;
      sfree(tmp);
    }
    term->beeptail = NULL;
    term->nbeeps = 0;

    /*
     * Reset the scrollback on keypress, if we're doing that.
     */
    if (term->cfg.scroll_on_key) {
      term->disptop = 0;             /* return to main screen */
      term->seen_disp_event = 1;
    }
}

/*
 * Same as power_on(), but an external function.
 */
void term_pwron(Terminal *term)
{
    power_on(term);
    if (term->ldisc)                 /* cause ldisc to notice changes */
      ldisc_send(term->ldisc, NULL, 0, 0);
    fix_cpos;
    term->disptop = 0;
    deselect(term);
    term_update(term);
}

/*
 * When the user reconfigures us, we need to check the forbidden-
 * alternate-screen config option, disable raw mouse mode if the
 * user has disabled mouse reporting, and abandon a print job if
 * the user has disabled printing.
 */
void term_reconfig(Terminal *term, Config *cfg)
{
    /*
     * Before adopting the new config, check all those terminal
     * settings which control power-on defaults; and if they've
     * changed, we will modify the current state as well as the
     * default one. The full list is: Auto wrap mode, DEC Origin
     * Mode, BCE, blinking text, character classes.
     */
    int reset_wrap, reset_decom, reset_bce, reset_blink, reset_charclass;
    int i;

    reset_wrap = (term->cfg.wrap_mode != cfg->wrap_mode);
    reset_decom = (term->cfg.dec_om != cfg->dec_om);
    reset_bce = (term->cfg.bce != cfg->bce);
    reset_blink = (term->cfg.blinktext != cfg->blinktext);
    reset_charclass = 0;
    for (i = 0; i < lenof(term->cfg.wordness); i++)
      if (term->cfg.wordness[i] != cfg->wordness[i])
          reset_charclass = 1;

    term->cfg = *cfg;                /* STRUCTURE COPY */

    if (reset_wrap)
      term->alt_wrap = term->wrap = term->cfg.wrap_mode;
    if (reset_decom)
      term->alt_om = term->dec_om = term->cfg.dec_om;
    if (reset_bce) {
      term->use_bce = term->cfg.bce;
      if (term->use_bce)
          term->erase_char = (' ' | ATTR_ASCII |
                        (term->curr_attr &
                         (ATTR_FGMASK | ATTR_BGMASK)));
      else
          term->erase_char = ERASE_CHAR;
    }
    if (reset_blink)
      term->blink_is_real = term->cfg.blinktext;
    if (reset_charclass)
      for (i = 0; i < 256; i++)
          term->wordness[i] = term->cfg.wordness[i];

    if (term->cfg.no_alt_screen)
      swap_screen(term, 0, FALSE, FALSE);
    if (term->cfg.no_mouse_rep) {
      term->xterm_mouse = 0;
      set_raw_mouse_mode(term->frontend, 0);
    }
    if (term->cfg.no_remote_charset) {
      term->cset_attr[0] = term->cset_attr[1] = ATTR_ASCII;
      term->sco_acs = term->alt_sco_acs = 0;
      term->utf = 0;
    }
    if (!*term->cfg.printer) {
      term_print_finish(term);
    }
}

/*
 * Clear the scrollback.
 */
void term_clrsb(Terminal *term)
{
    unsigned long *line;
    term->disptop = 0;
    while ((line = delpos234(term->scrollback, 0)) != NULL) {
      sfree(line);
    }
    term->tempsblines = 0;
    term->alt_sblines = 0;
    update_sbar(term);
}

/*
 * Initialise the terminal.
 */
Terminal *term_init(Config *mycfg, struct unicode_data *ucsdata,
                void *frontend)
{
    Terminal *term;

    /*
     * Allocate a new Terminal structure and initialise the fields
     * that need it.
     */
    term = snew(Terminal);
    term->frontend = frontend;
    term->ucsdata = ucsdata;
    term->cfg = *mycfg;              /* STRUCTURE COPY */
    term->logctx = NULL;
    term->compatibility_level = TM_PUTTY;
    strcpy(term->id_string, "\033[?6c");
    term->last_blink = term->last_tblink = 0;
    term->paste_buffer = NULL;
    term->paste_len = 0;
    term->last_paste = 0;
    bufchain_init(&term->inbuf);
    bufchain_init(&term->printer_buf);
    term->printing = term->only_printing = FALSE;
    term->print_job = NULL;
    term->vt52_mode = FALSE;
    term->cr_lf_return = FALSE;
    term->seen_disp_event = FALSE;
    term->xterm_mouse = term->mouse_is_down = FALSE;
    term->reset_132 = FALSE;
    term->blinker = term->tblinker = 0;
    term->has_focus = 1;
    term->repeat_off = FALSE;
    term->termstate = TOPLEVEL;
    term->selstate = NO_SELECTION;
    term->curstype = 0;

    term->screen = term->alt_screen = term->scrollback = NULL;
    term->tempsblines = 0;
    term->alt_sblines = 0;
    term->disptop = 0;
    term->disptext = term->dispcurs = NULL;
    term->tabs = NULL;
    deselect(term);
    term->rows = term->cols = -1;
    power_on(term);
    term->beephead = term->beeptail = NULL;
#ifdef OPTIMISE_SCROLL
    term->scrollhead = term->scrolltail = NULL;
#endif /* OPTIMISE_SCROLL */
    term->nbeeps = 0;
    term->lastbeep = FALSE;
    term->beep_overloaded = FALSE;
    term->attr_mask = 0xffffffff;
    term->resize_fn = NULL;
    term->resize_ctx = NULL;
    term->in_term_out = FALSE;

    return term;
}

void term_free(Terminal *term)
{
    unsigned long *line;
    struct beeptime *beep;

    while ((line = delpos234(term->scrollback, 0)) != NULL)
      sfree(line);
    freetree234(term->scrollback);
    while ((line = delpos234(term->screen, 0)) != NULL)
      sfree(line);
    freetree234(term->screen);
    while ((line = delpos234(term->alt_screen, 0)) != NULL)
      sfree(line);
    freetree234(term->alt_screen);
    sfree(term->disptext);
    while (term->beephead) {
      beep = term->beephead;
      term->beephead = beep->next;
      sfree(beep);
    }
    bufchain_clear(&term->inbuf);
    if(term->print_job)
      printer_finish_job(term->print_job);
    bufchain_clear(&term->printer_buf);
    sfree(term->paste_buffer);
    sfree(term);
}

/*
 * Set up the terminal for a given size.
 */
void term_size(Terminal *term, int newrows, int newcols, int newsavelines)
{
    tree234 *newalt;
    unsigned long *newdisp, *line;
    int i, j;
    int sblen;
    int save_alt_which = term->alt_which;

    if (newrows == term->rows && newcols == term->cols &&
      newsavelines == term->savelines)
      return;                        /* nothing to do */

    deselect(term);
    swap_screen(term, 0, FALSE, FALSE);

    term->alt_t = term->marg_t = 0;
    term->alt_b = term->marg_b = newrows - 1;

    if (term->rows == -1) {
      term->scrollback = newtree234(NULL);
      term->screen = newtree234(NULL);
      term->tempsblines = 0;
      term->rows = 0;
    }

    /*
     * Resize the screen and scrollback. We only need to shift
     * lines around within our data structures, because lineptr()
     * will take care of resizing each individual line if
     * necessary. So:
     * 
     *  - If the new screen is longer, we shunt lines in from temporary
     *    scrollback if possible, otherwise we add new blank lines at
     *    the bottom.
     *
     *  - If the new screen is shorter, we remove any blank lines at
     *    the bottom if possible, otherwise shunt lines above the cursor
     *    to scrollback if possible, otherwise delete lines below the
     *    cursor.
     * 
     *  - Then, if the new scrollback length is less than the
     *    amount of scrollback we actually have, we must throw some
     *    away.
     */
    sblen = count234(term->scrollback);
    /* Do this loop to expand the screen if newrows > rows */
    assert(term->rows == count234(term->screen));
    while (term->rows < newrows) {
      if (term->tempsblines > 0) {
          /* Insert a line from the scrollback at the top of the screen. */
          assert(sblen >= term->tempsblines);
          line = delpos234(term->scrollback, --sblen);
          term->tempsblines -= 1;
          addpos234(term->screen, line, 0);
          term->curs.y += 1;
          term->savecurs.y += 1;
      } else {
          /* Add a new blank line at the bottom of the screen. */
          line = snewn(newcols + 2, TTYPE);
          line[0] = newcols;
          for (j = 0; j < newcols; j++)
            line[j + 1] = ERASE_CHAR;
            line[newcols + 1] = LATTR_NORM;
          addpos234(term->screen, line, count234(term->screen));
      }
      term->rows += 1;
    }
    /* Do this loop to shrink the screen if newrows < rows */
    while (term->rows > newrows) {
      if (term->curs.y < term->rows - 1) {
          /* delete bottom row, unless it contains the cursor */
          sfree(delpos234(term->screen, term->rows - 1));
      } else {
          /* push top row to scrollback */
          line = delpos234(term->screen, 0);
          addpos234(term->scrollback, line, sblen++);
          term->tempsblines += 1;
          term->curs.y -= 1;
          term->savecurs.y -= 1;
      }
      term->rows -= 1;
    }
    assert(term->rows == newrows);
    assert(count234(term->screen) == newrows);

    /* Delete any excess lines from the scrollback. */
    while (sblen > newsavelines) {
      line = delpos234(term->scrollback, 0);
      sfree(line);
      sblen--;
    }
    if (sblen < term->tempsblines)
      term->tempsblines = sblen;
    assert(count234(term->scrollback) <= newsavelines);
    assert(count234(term->scrollback) >= term->tempsblines);
    term->disptop = 0;

    /* Make a new displayed text buffer. */
    newdisp = snewn(newrows * (newcols + 1), TTYPE);
    for (i = 0; i < newrows * (newcols + 1); i++)
      newdisp[i] = ATTR_INVALID;
    sfree(term->disptext);
    term->disptext = newdisp;
    term->dispcurs = NULL;

    /* Make a new alternate screen. */
    newalt = newtree234(NULL);
    for (i = 0; i < newrows; i++) {
      line = snewn(newcols + 2, TTYPE);
      line[0] = newcols;
      for (j = 0; j < newcols; j++)
          line[j + 1] = term->erase_char;
        line[newcols + 1] = LATTR_NORM;
      addpos234(newalt, line, i);
    }
    if (term->alt_screen) {
      while (NULL != (line = delpos234(term->alt_screen, 0)))
          sfree(line);
      freetree234(term->alt_screen);
    }
    term->alt_screen = newalt;
    term->alt_sblines = 0;

    term->tabs = sresize(term->tabs, newcols, unsigned char);
    {
      int i;
      for (i = (term->cols > 0 ? term->cols : 0); i < newcols; i++)
          term->tabs[i] = (i % 8 == 0 ? TRUE : FALSE);
    }

    /* Check that the cursor positions are still valid. */
    if (term->savecurs.y < 0)
      term->savecurs.y = 0;
    if (term->savecurs.y >= newrows)
      term->savecurs.y = newrows - 1;
    if (term->curs.y < 0)
      term->curs.y = 0;
    if (term->curs.y >= newrows)
      term->curs.y = newrows - 1;
    if (term->curs.x >= newcols)
      term->curs.x = newcols - 1;
    term->alt_x = term->alt_y = 0;
    term->wrapnext = term->alt_wnext = FALSE;

    term->rows = newrows;
    term->cols = newcols;
    term->savelines = newsavelines;
    fix_cpos;

    swap_screen(term, save_alt_which, FALSE, FALSE);

    update_sbar(term);
    term_update(term);
    if (term->resize_fn)
      term->resize_fn(term->resize_ctx, term->cols, term->rows);
}

/*
 * Hand a function and context pointer to the terminal which it can
 * use to notify a back end of resizes.
 */
void term_provide_resize_fn(Terminal *term,
                      void (*resize_fn)(void *, int, int),
                      void *resize_ctx)
{
    term->resize_fn = resize_fn;
    term->resize_ctx = resize_ctx;
    if (term->cols > 0 && term->rows > 0)
      resize_fn(resize_ctx, term->cols, term->rows);
}

/* Find the bottom line on the screen that has any content.
 * If only the top line has content, returns 0.
 * If no lines have content, return -1.
 */ 
static int find_last_nonempty_line(Terminal * term, tree234 * screen)
{
    int i;
    for (i = count234(screen) - 1; i >= 0; i--) {
      unsigned long *line = index234(screen, i);
      int j;
      int cols = line[0];
      for (j = 0; j < cols; j++) {
          if (line[j + 1] != term->erase_char) break;
      }
      if (j != cols) break;
    }
    return i;
}

/*
 * Swap screens. If `reset' is TRUE and we have been asked to
 * switch to the alternate screen, we must bring most of its
 * configuration from the main screen and erase the contents of the
 * alternate screen completely. (This is even true if we're already
 * on it! Blame xterm.)
 */
static void swap_screen(Terminal *term, int which, int reset, int keep_cur_pos)
{
    int t;
    tree234 *ttr;

    if (!which)
      reset = FALSE;                 /* do no weird resetting if which==0 */

    if (which != term->alt_which) {
      term->alt_which = which;

      ttr = term->alt_screen;
      term->alt_screen = term->screen;
      term->screen = ttr;
      term->alt_sblines = find_last_nonempty_line(term, term->alt_screen) + 1;
      t = term->curs.x;
      if (!reset && !keep_cur_pos)
          term->curs.x = term->alt_x;
      term->alt_x = t;
      t = term->curs.y;
      if (!reset && !keep_cur_pos)
          term->curs.y = term->alt_y;
      term->alt_y = t;
      t = term->marg_t;
      if (!reset) term->marg_t = term->alt_t;
      term->alt_t = t;
      t = term->marg_b;
      if (!reset) term->marg_b = term->alt_b;
      term->alt_b = t;
      t = term->dec_om;
      if (!reset) term->dec_om = term->alt_om;
      term->alt_om = t;
      t = term->wrap;
      if (!reset) term->wrap = term->alt_wrap;
      term->alt_wrap = t;
      t = term->wrapnext;
      if (!reset) term->wrapnext = term->alt_wnext;
      term->alt_wnext = t;
      t = term->insert;
      if (!reset) term->insert = term->alt_ins;
      term->alt_ins = t;
      t = term->cset;
      if (!reset) term->cset = term->alt_cset;
      term->alt_cset = t;
      t = term->utf;
      if (!reset) term->utf = term->alt_utf;
      term->alt_utf = t;
      t = term->sco_acs;
      if (!reset) term->sco_acs = term->alt_sco_acs;
      term->alt_sco_acs = t;
    }

    if (reset && term->screen) {
      /*
       * Yes, this _is_ supposed to honour background-colour-erase.
       */
      erase_lots(term, FALSE, TRUE, TRUE);
    }

    /*
     * This might not be possible if we're called during
     * initialisation.
     */
    if (term->screen)
      fix_cpos;
}

/*
 * Update the scroll bar.
 */
static void update_sbar(Terminal *term)
{
    int nscroll = sblines(term);
    set_sbar(term->frontend, nscroll + term->rows,
           nscroll + term->disptop, term->rows);
}

/*
 * Check whether the region bounded by the two pointers intersects
 * the scroll region, and de-select the on-screen selection if so.
 */
static void check_selection(Terminal *term, pos from, pos to)
{
    if (poslt(from, term->selend) && poslt(term->selstart, to))
      deselect(term);
}

/*
 * Scroll the screen. (`lines' is +ve for scrolling forward, -ve
 * for backward.) `sb' is TRUE if the scrolling is permitted to
 * affect the scrollback buffer.
 * 
 * NB this function invalidates all pointers into lines of the
 * screen data structures. In particular, you MUST call fix_cpos
 * after calling scroll() and before doing anything else that
 * uses the cpos shortcut pointer.
 */
static void scroll(Terminal *term, int topline, int botline, int lines, int sb)
{
    unsigned long *line, *line2;
    int i, seltop, olddisptop, shift;

    if (topline != 0 || term->alt_which != 0)
      sb = FALSE;

    olddisptop = term->disptop;
    shift = lines;
    if (lines < 0) {
      while (lines < 0) {
          line = delpos234(term->screen, botline);
            line = resizeline(line, term->cols);
          for (i = 0; i < term->cols; i++)
            line[i + 1] = term->erase_char;
          line[term->cols + 1] = 0;
          addpos234(term->screen, line, topline);

          if (term->selstart.y >= topline && term->selstart.y <= botline) {
            term->selstart.y++;
            if (term->selstart.y > botline) {
                term->selstart.y = botline + 1;
                term->selstart.x = 0;
            }
          }
          if (term->selend.y >= topline && term->selend.y <= botline) {
            term->selend.y++;
            if (term->selend.y > botline) {
                term->selend.y = botline + 1;
                term->selend.x = 0;
            }
          }

          lines++;
      }
    } else {
      while (lines > 0) {
          line = delpos234(term->screen, topline);
          if (sb && term->savelines > 0) {
            int sblen = count234(term->scrollback);
            /*
             * We must add this line to the scrollback. We'll
             * remove a line from the top of the scrollback to
             * replace it, or allocate a new one if the
             * scrollback isn't full.
             */
            if (sblen == term->savelines) {
                sblen--, line2 = delpos234(term->scrollback, 0);
            } else {
                line2 = snewn(term->cols + 2, TTYPE);
                line2[0] = term->cols;
                term->tempsblines += 1;
            }
            addpos234(term->scrollback, line, sblen);
            line = line2;

            /*
             * If the user is currently looking at part of the
             * scrollback, and they haven't enabled any options
             * that are going to reset the scrollback as a
             * result of this movement, then the chances are
             * they'd like to keep looking at the same line. So
             * we move their viewpoint at the same rate as the
             * scroll, at least until their viewpoint hits the
             * top end of the scrollback buffer, at which point
             * we don't have the choice any more.
             * 
             * Thanks to Jan Holmen Holsten for the idea and
             * initial implementation.
             */
            if (term->disptop > -term->savelines && term->disptop < 0)
                term->disptop--;
          }
            line = resizeline(line, term->cols);
          for (i = 0; i < term->cols; i++)
            line[i + 1] = term->erase_char;
          line[term->cols + 1] = LATTR_NORM;
          addpos234(term->screen, line, botline);

          /*
           * If the selection endpoints move into the scrollback,
           * we keep them moving until they hit the top. However,
           * of course, if the line _hasn't_ moved into the
           * scrollback then we don't do this, and cut them off
           * at the top of the scroll region.
           * 
           * This applies to selstart and selend (for an existing
           * selection), and also selanchor (for one being
           * selected as we speak).
           */
          seltop = sb ? -term->savelines : topline;

          if (term->selstate != NO_SELECTION) {
            if (term->selstart.y >= seltop &&
                term->selstart.y <= botline) {
                term->selstart.y--;
                if (term->selstart.y < seltop) {
                  term->selstart.y = seltop;
                  term->selstart.x = 0;
                }
            }
            if (term->selend.y >= seltop && term->selend.y <= botline) {
                term->selend.y--;
                if (term->selend.y < seltop) {
                  term->selend.y = seltop;
                  term->selend.x = 0;
                }
            }
            if (term->selanchor.y >= seltop &&
                term->selanchor.y <= botline) {
                term->selanchor.y--;
                if (term->selanchor.y < seltop) {
                  term->selanchor.y = seltop;
                  term->selanchor.x = 0;
                }
            }
          }

          lines--;
      }
    }
#ifdef OPTIMISE_SCROLL
    shift += term->disptop - olddisptop;
    if (shift < term->rows && shift > -term->rows && shift != 0)
      scroll_display(term, topline, botline, shift);
#endif /* OPTIMISE_SCROLL */
}

#ifdef OPTIMISE_SCROLL
/*
 * Add a scroll of a region on the screen into the pending scroll list.
 * `lines' is +ve for scrolling forward, -ve for backward.
 *
 * If the scroll is on the same area as the last scroll in the list,
 * merge them.
 */
static void save_scroll(Terminal *term, int topline, int botline, int lines)
{
    struct scrollregion *newscroll;
    if (term->scrolltail &&
      term->scrolltail->topline == topline && 
      term->scrolltail->botline == botline) {
      term->scrolltail->lines += lines;
    } else {
      newscroll = snew(struct scrollregion);
      newscroll->topline = topline;
      newscroll->botline = botline;
      newscroll->lines = lines;
      newscroll->next = NULL;

      if (!term->scrollhead)
          term->scrollhead = newscroll;
      else
          term->scrolltail->next = newscroll;
      term->scrolltail = newscroll;
    }
}

/*
 * Scroll the physical display, and our conception of it in disptext.
 */
static void scroll_display(Terminal *term, int topline, int botline, int lines)
{
    unsigned long *start, *end;
    int distance, size, i;

    start = term->disptext + topline * (term->cols + 1);
    end = term->disptext + (botline + 1) * (term->cols + 1);
    distance = (lines > 0 ? lines : -lines) * (term->cols + 1);
    size = end - start - distance;
    if (lines > 0) {
      memmove(start, start + distance, size * TSIZE);
      if (term->dispcurs >= start + distance &&
          term->dispcurs <= start + distance + size)
          term->dispcurs -= distance;
      for (i = 0; i < distance; i++)
          (start + size)[i] |= ATTR_INVALID;
    } else {
      memmove(start + distance, start, size * TSIZE);
      if (term->dispcurs >= start && term->dispcurs <= start + size)
          term->dispcurs += distance;
      for (i = 0; i < distance; i++)
          start[i] |= ATTR_INVALID;
    }
    save_scroll(term, topline, botline, lines);
}
#endif /* OPTIMISE_SCROLL */

/*
 * Move the cursor to a given position, clipping at boundaries. We
 * may or may not want to clip at the scroll margin: marg_clip is 0
 * not to, 1 to disallow _passing_ the margins, and 2 to disallow
 * even _being_ outside the margins.
 */
static void move(Terminal *term, int x, int y, int marg_clip)
{
    if (x < 0)
      x = 0;
    if (x >= term->cols)
      x = term->cols - 1;
    if (marg_clip) {
      if ((term->curs.y >= term->marg_t || marg_clip == 2) &&
          y < term->marg_t)
          y = term->marg_t;
      if ((term->curs.y <= term->marg_b || marg_clip == 2) &&
          y > term->marg_b)
          y = term->marg_b;
    }
    if (y < 0)
      y = 0;
    if (y >= term->rows)
      y = term->rows - 1;
    term->curs.x = x;
    term->curs.y = y;
    fix_cpos;
    term->wrapnext = FALSE;
}

/*
 * Save or restore the cursor and SGR mode.
 */
static void save_cursor(Terminal *term, int save)
{
    if (save) {
      term->savecurs = term->curs;
      term->save_attr = term->curr_attr;
      term->save_cset = term->cset;
      term->save_utf = term->utf;
      term->save_wnext = term->wrapnext;
      term->save_csattr = term->cset_attr[term->cset];
      term->save_sco_acs = term->sco_acs;
    } else {
      term->curs = term->savecurs;
      /* Make sure the window hasn't shrunk since the save */
      if (term->curs.x >= term->cols)
          term->curs.x = term->cols - 1;
      if (term->curs.y >= term->rows)
          term->curs.y = term->rows - 1;

      term->curr_attr = term->save_attr;
      term->cset = term->save_cset;
      term->utf = term->save_utf;
      term->wrapnext = term->save_wnext;
      /*
       * wrapnext might reset to False if the x position is no
       * longer at the rightmost edge.
       */
      if (term->wrapnext && term->curs.x < term->cols-1)
          term->wrapnext = FALSE;
      term->cset_attr[term->cset] = term->save_csattr;
      term->sco_acs = term->save_sco_acs;
      fix_cpos;
      if (term->use_bce)
          term->erase_char = (' ' | ATTR_ASCII |
                        (term->curr_attr &
                         (ATTR_FGMASK | ATTR_BGMASK)));
    }
}

/*
 * This function is called before doing _anything_ which affects
 * only part of a line of text. It is used to mark the boundary
 * between two character positions, and it indicates that some sort
 * of effect is going to happen on only one side of that boundary.
 * 
 * The effect of this function is to check whether a CJK
 * double-width character is straddling the boundary, and to remove
 * it and replace it with two spaces if so. (Of course, one or
 * other of those spaces is then likely to be replaced with
 * something else again, as a result of whatever happens next.)
 * 
 * Also, if the boundary is at the right-hand _edge_ of the screen,
 * it implies something deliberate is being done to the rightmost
 * column position; hence we must clear LATTR_WRAPPED2.
 * 
 * The input to the function is the coordinates of the _second_
 * character of the pair.
 */
static void check_boundary(Terminal *term, int x, int y)
{
    unsigned long *ldata;

    /* Validate input coordinates, just in case. */
    if (x == 0 || x > term->cols)
      return;

    ldata = lineptr(y);
    if (x == term->cols) {
      ldata[x] &= ~LATTR_WRAPPED2;
    } else {
      if ((ldata[x] & (CHAR_MASK | CSET_MASK)) == UCSWIDE) {
          ldata[x-1] = ldata[x] =
            (ldata[x-1] &~ (CHAR_MASK | CSET_MASK)) | ATTR_ASCII | ' ';
      }
    }
}

/*
 * Erase a large portion of the screen: the whole screen, or the
 * whole line, or parts thereof.
 */
static void erase_lots(Terminal *term,
                   int line_only, int from_begin, int to_end)
{
    pos start, end;
    int erase_lattr;
    int erasing_lines_from_top = 0;

    if (line_only) {
      start.y = term->curs.y;
      start.x = 0;
      end.y = term->curs.y + 1;
      end.x = 0;
      erase_lattr = FALSE;
    } else {
      start.y = 0;
      start.x = 0;
      end.y = term->rows;
      end.x = 0;
      erase_lattr = TRUE;
    }
    if (!from_begin) {
      start = term->curs;
    }
    if (!to_end) {
      end = term->curs;
      incpos(end);
    }
    if (!from_begin || !to_end)
      check_boundary(term, term->curs.x, term->curs.y);
    check_selection(term, start, end);

    /* Clear screen also forces a full window redraw, just in case. */
    if (start.y == 0 && start.x == 0 && end.y == term->rows)
      term_invalidate(term);

    /* Lines scrolled away shouldn't be brought back on if the terminal
     * resizes. */
    if (start.y == 0 && start.x == 0 && end.x == 0 && erase_lattr)
      erasing_lines_from_top = 1;

    if (term->cfg.erase_to_scrollback && erasing_lines_from_top) {
      /* If it's a whole number of lines, starting at the top, and
       * we're fully erasing them, erase by scrolling and keep the
       * lines in the scrollback. */
      int scrolllines = end.y;
      if (end.y == term->rows) {
          /* Shrink until we find a non-empty row.*/
          scrolllines = find_last_nonempty_line(term, term->screen) + 1;
      }
      if (scrolllines > 0)
          scroll(term, 0, scrolllines - 1, scrolllines, TRUE);
      fix_cpos;
    } else {
      unsigned long *ldata = lineptr(start.y);
      while (poslt(start, end)) {
          if (start.x == term->cols) {
            if (!erase_lattr)
                ldata[start.x] &= ~(LATTR_WRAPPED | LATTR_WRAPPED2);
            else
                ldata[start.x] = LATTR_NORM;
          } else {
            ldata[start.x] = term->erase_char;
          }
          if (incpos(start) && start.y < term->rows)
            ldata = lineptr(start.y);
      }
    }

    /* After an erase of lines from the top of the screen, we shouldn't
     * bring the lines back again if the terminal enlarges (since the user or
     * application has explictly thrown them away). */
    if (erasing_lines_from_top && !(term->alt_which))
      term->tempsblines = 0;
}

/*
 * Insert or delete characters within the current line. n is +ve if
 * insertion is desired, and -ve for deletion.
 */
static void insch(Terminal *term, int n)
{
    int dir = (n < 0 ? -1 : +1);
    int m;
    pos cursplus;
    unsigned long *ldata;

    n = (n < 0 ? -n : n);
    if (n > term->cols - term->curs.x)
      n = term->cols - term->curs.x;
    m = term->cols - term->curs.x - n;
    cursplus.y = term->curs.y;
    cursplus.x = term->curs.x + n;
    check_selection(term, term->curs, cursplus);
    check_boundary(term, term->curs.x, term->curs.y);
    if (dir < 0)
      check_boundary(term, term->curs.x + n, term->curs.y);
    ldata = lineptr(term->curs.y);
    if (dir < 0) {
      memmove(ldata + term->curs.x, ldata + term->curs.x + n, m * TSIZE);
      while (n--)
          ldata[term->curs.x + m++] = term->erase_char;
    } else {
      memmove(ldata + term->curs.x + n, ldata + term->curs.x, m * TSIZE);
      while (n--)
          ldata[term->curs.x + n] = term->erase_char;
    }
}

/*
 * Toggle terminal mode `mode' to state `state'. (`query' indicates
 * whether the mode is a DEC private one or a normal one.)
 */
static void toggle_mode(Terminal *term, int mode, int query, int state)
{
    unsigned long ticks;

    if (query)
      switch (mode) {
        case 1:                /* DECCKM: application cursor keys */
          term->app_cursor_keys = state;
          break;
        case 2:                /* DECANM: VT52 mode */
          term->vt52_mode = !state;
          if (term->vt52_mode) {
            term->blink_is_real = FALSE;
            term->vt52_bold = FALSE;
          } else {
            term->blink_is_real = term->cfg.blinktext;
          }
          break;
        case 3:                /* DECCOLM: 80/132 columns */
          deselect(term);
          if (!term->cfg.no_remote_resize)
            request_resize(term->frontend, state ? 132 : 80, term->rows);
          term->reset_132 = state;
          term->alt_t = term->marg_t = 0;
          term->alt_b = term->marg_b = term->rows - 1;
          move(term, 0, 0, 0);
          erase_lots(term, FALSE, TRUE, TRUE);
          break;
        case 5:                /* DECSCNM: reverse video */
          /*
           * Toggle reverse video. If we receive an OFF within the
           * visual bell timeout period after an ON, we trigger an
           * effective visual bell, so that ESC[?5hESC[?5l will
           * always be an actually _visible_ visual bell.
           */
          ticks = GETTICKCOUNT();
          /* turn off a previous vbell to avoid inconsistencies */
          if (ticks - term->vbell_startpoint >= VBELL_TIMEOUT)
            term->in_vbell = FALSE;
          if (term->rvideo && !state &&    /* we're turning it off... */
            (ticks - term->rvbell_startpoint) < VBELL_TIMEOUT) {/*...soon*/
            /* If there's no vbell timeout already, or this one lasts
             * longer, replace vbell_timeout with ours. */
            if (!term->in_vbell ||
                (term->rvbell_startpoint - term->vbell_startpoint <
                 VBELL_TIMEOUT))
                term->vbell_startpoint = term->rvbell_startpoint;
            term->in_vbell = TRUE; /* may clear rvideo but set in_vbell */
          } else if (!term->rvideo && state) {
            /* This is an ON, so we notice the time and save it. */
            term->rvbell_startpoint = ticks;
          }
          term->rvideo = state;
          term->seen_disp_event = TRUE;
          if (state)
            term_update(term);
          break;
        case 6:                /* DECOM: DEC origin mode */
          term->dec_om = state;
          break;
        case 7:                /* DECAWM: auto wrap */
          term->wrap = state;
          break;
        case 8:                /* DECARM: auto key repeat */
          term->repeat_off = !state;
          break;
        case 10:               /* DECEDM: set local edit mode */
          term->term_editing = state;
          if (term->ldisc)           /* cause ldisc to notice changes */
            ldisc_send(term->ldisc, NULL, 0, 0);
          break;
        case 25:               /* DECTCEM: enable/disable cursor */
          compatibility2(OTHER, VT220);
          term->cursor_on = state;
          term->seen_disp_event = TRUE;
          break;
        case 47:               /* alternate screen */
          compatibility(OTHER);
          deselect(term);
          swap_screen(term, term->cfg.no_alt_screen ? 0 : state, FALSE, FALSE);
          term->disptop = 0;
          break;
        case 1000:                   /* xterm mouse 1 */
          term->xterm_mouse = state ? 1 : 0;
          set_raw_mouse_mode(term->frontend, state);
          break;
        case 1002:                   /* xterm mouse 2 */
          term->xterm_mouse = state ? 2 : 0;
          set_raw_mouse_mode(term->frontend, state);
          break;
        case 1047:                   /* alternate screen */
          compatibility(OTHER);
          deselect(term);
          swap_screen(term, term->cfg.no_alt_screen ? 0 : state, TRUE, TRUE);
          term->disptop = 0;
          break;
        case 1048:                   /* save/restore cursor */
          if (!term->cfg.no_alt_screen)
                save_cursor(term, state);
          if (!state) term->seen_disp_event = TRUE;
          break;
        case 1049:                   /* cursor & alternate screen */
          if (state && !term->cfg.no_alt_screen)
            save_cursor(term, state);
          if (!state) term->seen_disp_event = TRUE;
          compatibility(OTHER);
          deselect(term);
          swap_screen(term, term->cfg.no_alt_screen ? 0 : state, TRUE, FALSE);
          if (!state && !term->cfg.no_alt_screen)
            save_cursor(term, state);
          term->disptop = 0;
          break;
    } else
      switch (mode) {
        case 4:                /* IRM: set insert mode */
          compatibility(VT102);
          term->insert = state;
          break;
        case 12:               /* SRM: set echo mode */
          term->term_echoing = !state;
          if (term->ldisc)           /* cause ldisc to notice changes */
            ldisc_send(term->ldisc, NULL, 0, 0);
          break;
        case 20:               /* LNM: Return sends ... */
          term->cr_lf_return = state;
          break;
        case 34:               /* WYULCURM: Make cursor BIG */
          compatibility2(OTHER, VT220);
          term->big_cursor = !state;
      }
}

/*
 * Process an OSC sequence: set window title or icon name.
 */
static void do_osc(Terminal *term)
{
    if (term->osc_w) {
      while (term->osc_strlen--)
          term->wordness[(unsigned char)
            term->osc_string[term->osc_strlen]] = term->esc_args[0];
    } else {
      term->osc_string[term->osc_strlen] = '\0';
      switch (term->esc_args[0]) {
        case 0:
        case 1:
          if (!term->cfg.no_remote_wintitle)
            set_icon(term->frontend, term->osc_string);
          if (term->esc_args[0] == 1)
            break;
          /* fall through: parameter 0 means set both */
        case 2:
        case 21:
          if (!term->cfg.no_remote_wintitle)
            set_title(term->frontend, term->osc_string);
          break;
      }
    }
}

/*
 * ANSI printing routines.
 */
static void term_print_setup(Terminal *term)
{
    bufchain_clear(&term->printer_buf);
    term->print_job = printer_start_job(term->cfg.printer);
}
static void term_print_flush(Terminal *term)
{
    void *data;
    int len;
    int size;
    while ((size = bufchain_size(&term->printer_buf)) > 5) {
      bufchain_prefix(&term->printer_buf, &data, &len);
      if (len > size-5)
          len = size-5;
      printer_job_data(term->print_job, data, len);
      bufchain_consume(&term->printer_buf, len);
    }
}
static void term_print_finish(Terminal *term)
{
    void *data;
    int len, size;
    char c;

    if (!term->printing && !term->only_printing)
      return;                        /* we need do nothing */

    term_print_flush(term);
    while ((size = bufchain_size(&term->printer_buf)) > 0) {
      bufchain_prefix(&term->printer_buf, &data, &len);
      c = *(char *)data;
      if (c == '\033' || c == '\233') {
          bufchain_consume(&term->printer_buf, size);
          break;
      } else {
          printer_job_data(term->print_job, &c, 1);
          bufchain_consume(&term->printer_buf, 1);
      }
    }
    printer_finish_job(term->print_job);
    term->print_job = NULL;
    term->printing = term->only_printing = FALSE;
}

/*
 * Remove everything currently in `inbuf' and stick it up on the
 * in-memory display. There's a big state machine in here to
 * process escape sequences...
 */
void term_out(Terminal *term)
{
    int c, unget;
    unsigned char localbuf[256], *chars;
    int nchars = 0;

    unget = -1;

    chars = NULL;              /* placate compiler warnings */
    while (nchars > 0 || bufchain_size(&term->inbuf) > 0) {
      if (unget == -1) {
          if (nchars == 0) {
            void *ret;
            bufchain_prefix(&term->inbuf, &ret, &nchars);
            if (nchars > sizeof(localbuf))
                nchars = sizeof(localbuf);
            memcpy(localbuf, ret, nchars);
            bufchain_consume(&term->inbuf, nchars);
            chars = localbuf;
            assert(chars != NULL);
          }
          c = *chars++;
          nchars--;

          /*
           * Optionally log the session traffic to a file. Useful for
           * debugging and possibly also useful for actual logging.
           */
          if (term->cfg.logtype == LGTYP_DEBUG && term->logctx)
            logtraffic(term->logctx, (unsigned char) c, LGTYP_DEBUG);
      } else {
          c = unget;
          unget = -1;
      }

      /* Note only VT220+ are 8-bit VT102 is seven bit, it shouldn't even
       * be able to display 8-bit characters, but I'll let that go 'cause
       * of i18n.
       */

      /*
       * If we're printing, add the character to the printer
       * buffer.
       */
      if (term->printing) {
          bufchain_add(&term->printer_buf, &c, 1);

          /*
           * If we're in print-only mode, we use a much simpler
           * state machine designed only to recognise the ESC[4i
           * termination sequence.
           */
          if (term->only_printing) {
            if (c == '\033')
                term->print_state = 1;
            else if (c == (unsigned char)'\233')
                term->print_state = 2;
            else if (c == '[' && term->print_state == 1)
                term->print_state = 2;
            else if (c == '4' && term->print_state == 2)
                term->print_state = 3;
            else if (c == 'i' && term->print_state == 3)
                term->print_state = 4;
            else
                term->print_state = 0;
            if (term->print_state == 4) {
                term_print_finish(term);
            }
            continue;
          }
      }

      /* First see about all those translations. */
      if (term->termstate == TOPLEVEL) {
          if (in_utf(term))
            switch (term->utf_state) {
              case 0:
                if (c < 0x80) {
                  /* UTF-8 must be stateless so we ignore iso2022. */
                  if (term->ucsdata->unitab_ctrl[c] != 0xFF) 
                       c = term->ucsdata->unitab_ctrl[c];
                  else c = ((unsigned char)c) | ATTR_ASCII;
                  break;
                } else if ((c & 0xe0) == 0xc0) {
                  term->utf_size = term->utf_state = 1;
                  term->utf_char = (c & 0x1f);
                } else if ((c & 0xf0) == 0xe0) {
                  term->utf_size = term->utf_state = 2;
                  term->utf_char = (c & 0x0f);
                } else if ((c & 0xf8) == 0xf0) {
                  term->utf_size = term->utf_state = 3;
                  term->utf_char = (c & 0x07);
                } else if ((c & 0xfc) == 0xf8) {
                  term->utf_size = term->utf_state = 4;
                  term->utf_char = (c & 0x03);
                } else if ((c & 0xfe) == 0xfc) {
                  term->utf_size = term->utf_state = 5;
                  term->utf_char = (c & 0x01);
                } else {
                  c = UCSERR;
                  break;
                }
                continue;
              case 1:
              case 2:
              case 3:
              case 4:
              case 5:
                if ((c & 0xC0) != 0x80) {
                  unget = c;
                  c = UCSERR;
                  term->utf_state = 0;
                  break;
                }
                term->utf_char = (term->utf_char << 6) | (c & 0x3f);
                if (--term->utf_state)
                  continue;

                c = term->utf_char;

                /* Is somebody trying to be evil! */
                if (c < 0x80 ||
                  (c < 0x800 && term->utf_size >= 2) ||
                  (c < 0x10000 && term->utf_size >= 3) ||
                  (c < 0x200000 && term->utf_size >= 4) ||
                  (c < 0x4000000 && term->utf_size >= 5))
                  c = UCSERR;

                /* Unicode line separator and paragraph separator are CR-LF */
                if (c == 0x2028 || c == 0x2029)
                  c = 0x85;

                /* High controls are probably a Baaad idea too. */
                if (c < 0xA0)
                  c = 0xFFFD;

                /* The UTF-16 surrogates are not nice either. */
                /*       The standard give the option of decoding these: 
                 *       I don't want to! */
                if (c >= 0xD800 && c < 0xE000)
                  c = UCSERR;

                /* ISO 10646 characters now limited to UTF-16 range. */
                if (c > 0x10FFFF)
                  c = UCSERR;

                /* This is currently a TagPhobic application.. */
                if (c >= 0xE0000 && c <= 0xE007F)
                  continue;

                /* U+FEFF is best seen as a null. */
                if (c == 0xFEFF)
                  continue;
                /* But U+FFFE is an error. */
                if (c == 0xFFFE || c == 0xFFFF)
                  c = UCSERR;

                /* Oops this is a 16bit implementation */
                if (c >= 0x10000)
                  c = 0xFFFD;
                break;
          }
          /* Are we in the nasty ACS mode? Note: no sco in utf mode. */
          else if(term->sco_acs && 
                (c!='\033' && c!='\n' && c!='\015' && c!='\b'))
          {
             if (term->sco_acs == 2) c |= 0x80;
             c |= ATTR_SCOACS;
          } else {
            switch (term->cset_attr[term->cset]) {
                /* 
                 * Linedraw characters are different from 'ESC ( B'
                 * only for a small range. For ones outside that
                 * range, make sure we use the same font as well as
                 * the same encoding.
                 */
              case ATTR_LINEDRW:
                if (term->ucsdata->unitab_ctrl[c] != 0xFF)
                  c = term->ucsdata->unitab_ctrl[c];
                else
                  c = ((unsigned char) c) | ATTR_LINEDRW;
                break;

              case ATTR_GBCHR:
                /* If UK-ASCII, make the '#' a LineDraw Pound */
                if (c == '#') {
                  c = '}' | ATTR_LINEDRW;
                  break;
                }
              /*FALLTHROUGH*/ case ATTR_ASCII:
                if (term->ucsdata->unitab_ctrl[c] != 0xFF)
                  c = term->ucsdata->unitab_ctrl[c];
                else
                  c = ((unsigned char) c) | ATTR_ASCII;
                break;
            case ATTR_SCOACS:
                if (c>=' ') c = ((unsigned char)c) | ATTR_SCOACS;
                break;
            }
          }
      }

      /* How about C1 controls ? */
      if ((c & -32) == 0x80 && term->termstate < DO_CTRLS &&
          !term->vt52_mode && has_compat(VT220)) {
          term->termstate = SEEN_ESC;
          term->esc_query = FALSE;
          c = '@' + (c & 0x1F);
      }

      /* Or the GL control. */
      if (c == '\177' && term->termstate < DO_CTRLS && has_compat(OTHER)) {
          if (term->curs.x && !term->wrapnext)
            term->curs.x--;
          term->wrapnext = FALSE;
          fix_cpos;
          if (!term->cfg.no_dbackspace)    /* destructive bksp might be disabled */
            *term->cpos = (' ' | term->curr_attr | ATTR_ASCII);
      } else
          /* Or normal C0 controls. */
      if ((c & -32) == 0 && term->termstate < DO_CTRLS) {
          switch (c) {
            case '\005':             /* ENQ: terminal type query */
            /* Strictly speaking this is VT100 but a VT100 defaults to
             * no response. Other terminals respond at their option.
             *
             * Don't put a CR in the default string as this tends to
             * upset some weird software.
             *
             * An xterm returns "xterm" (5 characters)
             */
            compatibility(ANSIMIN);
            if (term->ldisc) {
                char abuf[256], *s, *d;
                int state = 0;
                for (s = term->cfg.answerback, d = abuf; *s; s++) {
                  if (state) {
                      if (*s >= 'a' && *s <= 'z')
                        *d++ = (*s - ('a' - 1));
                      else if ((*s >= '@' && *s <= '_') ||
                             *s == '?' || (*s & 0x80))
                        *d++ = ('@' ^ *s);
                      else if (*s == '~')
                        *d++ = '^';
                      state = 0;
                  } else if (*s == '^') {
                      state = 1;
                  } else
                      *d++ = *s;
                }
                lpage_send(term->ldisc, DEFAULT_CODEPAGE,
                         abuf, d - abuf, 0);
            }
            break;
            case '\007':            /* BEL: Bell */
            {
                struct beeptime *newbeep;
                unsigned long ticks;

                ticks = GETTICKCOUNT();

                if (!term->beep_overloaded) {
                  newbeep = snew(struct beeptime);
                  newbeep->ticks = ticks;
                  newbeep->next = NULL;
                  if (!term->beephead)
                      term->beephead = newbeep;
                  else
                      term->beeptail->next = newbeep;
                  term->beeptail = newbeep;
                  term->nbeeps++;
                }

                /*
                 * Throw out any beeps that happened more than
                 * t seconds ago.
                 */
                while (term->beephead &&
                     term->beephead->ticks < ticks - term->cfg.bellovl_t) {
                  struct beeptime *tmp = term->beephead;
                  term->beephead = tmp->next;
                  sfree(tmp);
                  if (!term->beephead)
                      term->beeptail = NULL;
                  term->nbeeps--;
                }

                if (term->cfg.bellovl && term->beep_overloaded &&
                  ticks - term->lastbeep >= (unsigned)term->cfg.bellovl_s) {
                  /*
                   * If we're currently overloaded and the
                   * last beep was more than s seconds ago,
                   * leave overload mode.
                   */
                  term->beep_overloaded = FALSE;
                } else if (term->cfg.bellovl && !term->beep_overloaded &&
                         term->nbeeps >= term->cfg.bellovl_n) {
                  /*
                   * Now, if we have n or more beeps
                   * remaining in the queue, go into overload
                   * mode.
                   */
                  term->beep_overloaded = TRUE;
                }
                term->lastbeep = ticks;

                /*
                 * Perform an actual beep if we're not overloaded.
                 */
                if (!term->cfg.bellovl || !term->beep_overloaded) {
                  beep(term->frontend, term->cfg.beep);
                  if (term->cfg.beep == BELL_VISUAL) {
                      term->in_vbell = TRUE;
                      term->vbell_startpoint = ticks;
                      term_update(term);
                  }
                }
                term->seen_disp_event = TRUE;
            }
            break;
            case '\b':        /* BS: Back space */
            if (term->curs.x == 0 &&
                (term->curs.y == 0 || term->wrap == 0))
                /* do nothing */ ;
            else if (term->curs.x == 0 && term->curs.y > 0)
                term->curs.x = term->cols - 1, term->curs.y--;
            else if (term->wrapnext)
                term->wrapnext = FALSE;
            else
                term->curs.x--;
            fix_cpos;
            term->seen_disp_event = TRUE;
            break;
            case '\016':            /* LS1: Locking-shift one */
            compatibility(VT100);
            term->cset = 1;
            break;
            case '\017':            /* LS0: Locking-shift zero */
            compatibility(VT100);
            term->cset = 0;
            break;
            case '\033':            /* ESC: Escape */
            if (term->vt52_mode)
                term->termstate = VT52_ESC;
            else {
                compatibility(ANSIMIN);
                term->termstate = SEEN_ESC;
                term->esc_query = FALSE;
            }
            break;
            case '\015':            /* CR: Carriage return */
            term->curs.x = 0;
            term->wrapnext = FALSE;
            fix_cpos;
            term->seen_disp_event = TRUE;
            term->paste_hold = 0;
            if (term->logctx)
                logtraffic(term->logctx, (unsigned char) c, LGTYP_ASCII);
            break;
            case '\014':            /* FF: Form feed */
            if (has_compat(SCOANSI)) {
                move(term, 0, 0, 0);
                erase_lots(term, FALSE, FALSE, TRUE);
                term->disptop = 0;
                term->wrapnext = FALSE;
                term->seen_disp_event = 1;
                break;
            }
            case '\013':            /* VT: Line tabulation */
            compatibility(VT100);
            case '\n':        /* LF: Line feed */
            if (term->curs.y == term->marg_b)
                scroll(term, term->marg_t, term->marg_b, 1, TRUE);
            else if (term->curs.y < term->rows - 1)
                term->curs.y++;
            if (term->cfg.lfhascr)
                term->curs.x = 0;
            fix_cpos;
            term->wrapnext = FALSE;
            term->seen_disp_event = 1;
            term->paste_hold = 0;
            if (term->logctx)
                logtraffic(term->logctx, (unsigned char) c, LGTYP_ASCII);
            break;
            case '\t':        /* HT: Character tabulation */
            {
                pos old_curs = term->curs;
                unsigned long *ldata = lineptr(term->curs.y);

                do {
                  term->curs.x++;
                } while (term->curs.x < term->cols - 1 &&
                       !term->tabs[term->curs.x]);

                if ((ldata[term->cols] & LATTR_MODE) != LATTR_NORM) {
                  if (term->curs.x >= term->cols / 2)
                      term->curs.x = term->cols / 2 - 1;
                } else {
                  if (term->curs.x >= term->cols)
                      term->curs.x = term->cols - 1;
                }

                fix_cpos;
                check_selection(term, old_curs, term->curs);
            }
            term->seen_disp_event = TRUE;
            break;
          }
      } else
          switch (term->termstate) {
            case TOPLEVEL:
            /* Only graphic characters get this far;
             * ctrls are stripped above */
            if (term->wrapnext && term->wrap) {
                term->cpos[1] |= LATTR_WRAPPED;
                if (term->curs.y == term->marg_b)
                  scroll(term, term->marg_t, term->marg_b, 1, TRUE);
                else if (term->curs.y < term->rows - 1)
                  term->curs.y++;
                term->curs.x = 0;
                fix_cpos;
                term->wrapnext = FALSE;
            }
            if (term->insert)
                insch(term, 1);
            if (term->selstate != NO_SELECTION) {
                pos cursplus = term->curs;
                incpos(cursplus);
                check_selection(term, term->curs, cursplus);
            }
            if (((c & CSET_MASK) == ATTR_ASCII || (c & CSET_MASK) == 0) &&
                term->logctx)
                logtraffic(term->logctx, (unsigned char) c, LGTYP_ASCII);
            {
                int width = 0;
                if (DIRECT_CHAR(c))
                  width = 1;
                if (!width)
                  width = wcwidth((wchar_t) c);
                switch (width) {
                  case 2:
                  /*
                   * If we're about to display a double-width
                   * character starting in the rightmost
                   * column, then we do something special
                   * instead. We must print a space in the
                   * last column of the screen, then wrap;
                   * and we also set LATTR_WRAPPED2 which
                   * instructs subsequent cut-and-pasting not
                   * only to splice this line to the one
                   * after it, but to ignore the space in the
                   * last character position as well.
                   * (Because what was actually output to the
                   * terminal was presumably just a sequence
                   * of CJK characters, and we don't want a
                   * space to be pasted in the middle of
                   * those just because they had the
                   * misfortune to start in the wrong parity
                   * column. xterm concurs.)
                   */
                  check_boundary(term, term->curs.x, term->curs.y);
                  check_boundary(term, term->curs.x+2, term->curs.y);
                  if (term->curs.x == term->cols-1) {
                      *term->cpos++ = ATTR_ASCII | ' ' | term->curr_attr;
                      *term->cpos |= LATTR_WRAPPED | LATTR_WRAPPED2;
                      if (term->curs.y == term->marg_b)
                        scroll(term, term->marg_t, term->marg_b,
                               1, TRUE);
                      else if (term->curs.y < term->rows - 1)
                        term->curs.y++;
                      term->curs.x = 0;
                      fix_cpos;
                      /* Now we must check_boundary again, of course. */
                      check_boundary(term, term->curs.x, term->curs.y);
                      check_boundary(term, term->curs.x+2, term->curs.y);
                  }
                  *term->cpos++ = c | term->curr_attr;
                  *term->cpos++ = UCSWIDE | term->curr_attr;
                  term->curs.x++;
                  break;
                  case 1:
                  check_boundary(term, term->curs.x, term->curs.y);
                  check_boundary(term, term->curs.x+1, term->curs.y);
                  *term->cpos++ = c | term->curr_attr;
                  break;
                  default:
                  continue;
                }
            }
            term->curs.x++;
            if (term->curs.x == term->cols) {
                term->cpos--;
                term->curs.x--;
                term->wrapnext = TRUE;
                if (term->wrap && term->vt52_mode) {
                  term->cpos[1] |= LATTR_WRAPPED;
                  if (term->curs.y == term->marg_b)
                      scroll(term, term->marg_t, term->marg_b, 1, TRUE);
                  else if (term->curs.y < term->rows - 1)
                      term->curs.y++;
                  term->curs.x = 0;
                  fix_cpos;
                  term->wrapnext = FALSE;
                }
            }
            term->seen_disp_event = 1;
            break;

            case OSC_MAYBE_ST:
            /*
             * This state is virtually identical to SEEN_ESC, with the
             * exception that we have an OSC sequence in the pipeline,
             * and _if_ we see a backslash, we process it.
             */
            if (c == '\\') {
                do_osc(term);
                term->termstate = TOPLEVEL;
                break;
            }
            /* else fall through */
            case SEEN_ESC:
            if (c >= ' ' && c <= '/') {
                if (term->esc_query)
                  term->esc_query = -1;
                else
                  term->esc_query = c;
                break;
            }
            term->termstate = TOPLEVEL;
            switch (ANSI(c, term->esc_query)) {
              case '[':       /* enter CSI mode */
                term->termstate = SEEN_CSI;
                term->esc_nargs = 1;
                term->esc_args[0] = ARG_DEFAULT;
                term->esc_query = FALSE;
                break;
              case ']':       /* OSC: xterm escape sequences */
                /* Compatibility is nasty here, xterm, linux, decterm yuk! */
                compatibility(OTHER);
                term->termstate = SEEN_OSC;
                term->esc_args[0] = 0;
                break;
              case '7':       /* DECSC: save cursor */
                compatibility(VT100);
                save_cursor(term, TRUE);
                break;
              case '8':       /* DECRC: restore cursor */
                compatibility(VT100);
                save_cursor(term, FALSE);
                term->seen_disp_event = TRUE;
                break;
              case '=':       /* DECKPAM: Keypad application mode */
                compatibility(VT100);
                term->app_keypad_keys = TRUE;
                break;
              case '>':       /* DECKPNM: Keypad numeric mode */
                compatibility(VT100);
                term->app_keypad_keys = FALSE;
                break;
              case 'D':        /* IND: exactly equivalent to LF */
                compatibility(VT100);
                if (term->curs.y == term->marg_b)
                  scroll(term, term->marg_t, term->marg_b, 1, TRUE);
                else if (term->curs.y < term->rows - 1)
                  term->curs.y++;
                fix_cpos;
                term->wrapnext = FALSE;
                term->seen_disp_event = TRUE;
                break;
              case 'E':        /* NEL: exactly equivalent to CR-LF */
                compatibility(VT100);
                term->curs.x = 0;
                if (term->curs.y == term->marg_b)
                  scroll(term, term->marg_t, term->marg_b, 1, TRUE);
                else if (term->curs.y < term->rows - 1)
                  term->curs.y++;
                fix_cpos;
                term->wrapnext = FALSE;
                term->seen_disp_event = TRUE;
                break;
              case 'M':        /* RI: reverse index - backwards LF */
                compatibility(VT100);
                if (term->curs.y == term->marg_t)
                  scroll(term, term->marg_t, term->marg_b, -1, TRUE);
                else if (term->curs.y > 0)
                  term->curs.y--;
                fix_cpos;
                term->wrapnext = FALSE;
                term->seen_disp_event = TRUE;
                break;
              case 'Z':        /* DECID: terminal type query */
                compatibility(VT100);
                if (term->ldisc)
                  ldisc_send(term->ldisc, term->id_string,
                           strlen(term->id_string), 0);
                break;
              case 'c':        /* RIS: restore power-on settings */
                compatibility(VT100);
                power_on(term);
                if (term->ldisc)   /* cause ldisc to notice changes */
                  ldisc_send(term->ldisc, NULL, 0, 0);
                if (term->reset_132) {
                  if (!term->cfg.no_remote_resize)
                      request_resize(term->frontend, 80, term->rows);
                  term->reset_132 = 0;
                }
                fix_cpos;
                term->disptop = 0;
                term->seen_disp_event = TRUE;
                break;
              case 'H':        /* HTS: set a tab */
                compatibility(VT100);
                term->tabs[term->curs.x] = TRUE;
                break;

              case ANSI('8', '#'):  /* DECALN: fills screen with Es :-) */
                compatibility(VT100);
                {
                  unsigned long *ldata;
                  int i, j;
                  pos scrtop, scrbot;

                  for (i = 0; i < term->rows; i++) {
                      ldata = lineptr(i);
                      for (j = 0; j < term->cols; j++)
                        ldata[j] = ATTR_DEFAULT | 'E';
                      ldata[term->cols] = 0;
                  }
                  term->disptop = 0;
                  term->seen_disp_event = TRUE;
                  scrtop.x = scrtop.y = 0;
                  scrbot.x = 0;
                  scrbot.y = term->rows;
                  check_selection(term, scrtop, scrbot);
                }
                break;

              case ANSI('3', '#'):
              case ANSI('4', '#'):
              case ANSI('5', '#'):
              case ANSI('6', '#'):
                compatibility(VT100);
                {
                  unsigned long nlattr;
                  unsigned long *ldata;
                  switch (ANSI(c, term->esc_query)) {
                    case ANSI('3', '#'): /* DECDHL: 2*height, top */
                      nlattr = LATTR_TOP;
                      break;
                    case ANSI('4', '#'): /* DECDHL: 2*height, bottom */
                      nlattr = LATTR_BOT;
                      break;
                    case ANSI('5', '#'): /* DECSWL: normal */
                      nlattr = LATTR_NORM;
                      break;
                    default: /* case ANSI('6', '#'): DECDWL: 2*width */
                      nlattr = LATTR_WIDE;
                      break;
                  }
                  ldata = lineptr(term->curs.y);
                  ldata[term->cols] &= ~LATTR_MODE;
                  ldata[term->cols] |= nlattr;
                }
                break;
              /* GZD4: G0 designate 94-set */
              case ANSI('A', '('):
                compatibility(VT100);
                if (!term->cfg.no_remote_charset)
                  term->cset_attr[0] = ATTR_GBCHR;
                break;
              case ANSI('B', '('):
                compatibility(VT100);
                if (!term->cfg.no_remote_charset)
                  term->cset_attr[0] = ATTR_ASCII;
                break;
              case ANSI('0', '('):
                compatibility(VT100);
                if (!term->cfg.no_remote_charset)
                  term->cset_attr[0] = ATTR_LINEDRW;
                break;
              case ANSI('U', '('): 
                compatibility(OTHER);
                if (!term->cfg.no_remote_charset)
                  term->cset_attr[0] = ATTR_SCOACS; 
                break;
              /* G1D4: G1-designate 94-set */
              case ANSI('A', ')'):
                compatibility(VT100);
                if (!term->cfg.no_remote_charset)
                  term->cset_attr[1] = ATTR_GBCHR;
                break;
              case ANSI('B', ')'):
                compatibility(VT100);
                if (!term->cfg.no_remote_charset)
                  term->cset_attr[1] = ATTR_ASCII;
                break;
              case ANSI('0', ')'):
                compatibility(VT100);
                if (!term->cfg.no_remote_charset)
                  term->cset_attr[1] = ATTR_LINEDRW;
                break;
              case ANSI('U', ')'): 
                compatibility(OTHER);
                if (!term->cfg.no_remote_charset)
                  term->cset_attr[1] = ATTR_SCOACS; 
                break;
              /* DOCS: Designate other coding system */
              case ANSI('8', '%'):  /* Old Linux code */
              case ANSI('G', '%'):
                compatibility(OTHER);
                if (!term->cfg.no_remote_charset)
                  term->utf = 1;
                break;
              case ANSI('@', '%'):
                compatibility(OTHER);
                if (!term->cfg.no_remote_charset)
                  term->utf = 0;
                break;
            }
            break;
            case SEEN_CSI:
            term->termstate = TOPLEVEL;  /* default */
            if (isdigit(c)) {
                if (term->esc_nargs <= ARGS_MAX) {
                  if (term->esc_args[term->esc_nargs - 1] == ARG_DEFAULT)
                      term->esc_args[term->esc_nargs - 1] = 0;
                  term->esc_args[term->esc_nargs - 1] =
                      10 * term->esc_args[term->esc_nargs - 1] + c - '0';
                }
                term->termstate = SEEN_CSI;
            } else if (c == ';') {
                if (++term->esc_nargs <= ARGS_MAX)
                  term->esc_args[term->esc_nargs - 1] = ARG_DEFAULT;
                term->termstate = SEEN_CSI;
            } else if (c < '@') {
                if (term->esc_query)
                  term->esc_query = -1;
                else if (c == '?')
                  term->esc_query = TRUE;
                else
                  term->esc_query = c;
                term->termstate = SEEN_CSI;
            } else
                switch (ANSI(c, term->esc_query)) {
                  case 'A':       /* CUU: move up N lines */
                  move(term, term->curs.x,
                       term->curs.y - def(term->esc_args[0], 1), 1);
                  term->seen_disp_event = TRUE;
                  break;
                  case 'e':         /* VPR: move down N lines */
                  compatibility(ANSI);
                  /* FALLTHROUGH */
                  case 'B':         /* CUD: Cursor down */
                  move(term, term->curs.x,
                       term->curs.y + def(term->esc_args[0], 1), 1);
                  term->seen_disp_event = TRUE;
                  break;
                  case ANSI('c', '>'):    /* DA: report xterm version */
                  compatibility(OTHER);
                  /* this reports xterm version 136 so that VIM can
                     use the drag messages from the mouse reporting */
                  if (term->ldisc)
                      ldisc_send(term->ldisc, "\033[>0;136;0c", 11, 0);
                  break;
                  case 'a':         /* HPR: move right N cols */
                  compatibility(ANSI);
                  /* FALLTHROUGH */
                  case 'C':         /* CUF: Cursor right */ 
                  move(term, term->curs.x + def(term->esc_args[0], 1),
                       term->curs.y, 1);
                  term->seen_disp_event = TRUE;
                  break;
                  case 'D':       /* CUB: move left N cols */
                  move(term, term->curs.x - def(term->esc_args[0], 1),
                       term->curs.y, 1);
                  term->seen_disp_event = TRUE;
                  break;
                  case 'E':       /* CNL: move down N lines and CR */
                  compatibility(ANSI);
                  move(term, 0,
                       term->curs.y + def(term->esc_args[0], 1), 1);
                  term->seen_disp_event = TRUE;
                  break;
                  case 'F':       /* CPL: move up N lines and CR */
                  compatibility(ANSI);
                  move(term, 0,
                       term->curs.y - def(term->esc_args[0], 1), 1);
                  term->seen_disp_event = TRUE;
                  break;
                  case 'G':         /* CHA */
                  case '`':       /* HPA: set horizontal posn */
                  compatibility(ANSI);
                  move(term, def(term->esc_args[0], 1) - 1,
                       term->curs.y, 0);
                  term->seen_disp_event = TRUE;
                  break;
                  case 'd':       /* VPA: set vertical posn */
                  compatibility(ANSI);
                  move(term, term->curs.x,
                       ((term->dec_om ? term->marg_t : 0) +
                        def(term->esc_args[0], 1) - 1),
                       (term->dec_om ? 2 : 0));
                  term->seen_disp_event = TRUE;
                  break;
                  case 'H':        /* CUP */
                  case 'f':      /* HVP: set horz and vert posns at once */
                  if (term->esc_nargs < 2)
                      term->esc_args[1] = ARG_DEFAULT;
                  move(term, def(term->esc_args[1], 1) - 1,
                       ((term->dec_om ? term->marg_t : 0) +
                        def(term->esc_args[0], 1) - 1),
                       (term->dec_om ? 2 : 0));
                  term->seen_disp_event = TRUE;
                  break;
                  case 'J':       /* ED: erase screen or parts of it */
                  {
                      unsigned int i = def(term->esc_args[0], 0) + 1;
                      if (i > 3)
                        i = 0;
                      erase_lots(term, FALSE, !!(i & 2), !!(i & 1));
                  }
                  term->disptop = 0;
                  term->seen_disp_event = TRUE;
                  break;
                  case 'K':       /* EL: erase line or parts of it */
                  {
                      unsigned int i = def(term->esc_args[0], 0) + 1;
                      if (i > 3)
                        i = 0;
                      erase_lots(term, TRUE, !!(i & 2), !!(i & 1));
                  }
                  term->seen_disp_event = TRUE;
                  break;
                  case 'L':       /* IL: insert lines */
                  compatibility(VT102);
                  if (term->curs.y <= term->marg_b)
                      scroll(term, term->curs.y, term->marg_b,
                           -def(term->esc_args[0], 1), FALSE);
                  fix_cpos;
                  term->seen_disp_event = TRUE;
                  break;
                  case 'M':       /* DL: delete lines */
                  compatibility(VT102);
                  if (term->curs.y <= term->marg_b)
                      scroll(term, term->curs.y, term->marg_b,
                           def(term->esc_args[0], 1),
                           TRUE);
                  fix_cpos;
                  term->seen_disp_event = TRUE;
                  break;
                  case '@':       /* ICH: insert chars */
                  /* XXX VTTEST says this is vt220, vt510 manual says vt102 */
                  compatibility(VT102);
                  insch(term, def(term->esc_args[0], 1));
                  term->seen_disp_event = TRUE;
                  break;
                  case 'P':       /* DCH: delete chars */
                  compatibility(VT102);
                  insch(term, -def(term->esc_args[0], 1));
                  term->seen_disp_event = TRUE;
                  break;
                  case 'c':       /* DA: terminal type query */
                  compatibility(VT100);
                  /* This is the response for a VT102 */
                  if (term->ldisc)
                      ldisc_send(term->ldisc, term->id_string,
                               strlen(term->id_string), 0);
                  break;
                  case 'n':       /* DSR: cursor position query */
                  if (term->ldisc) {
                      if (term->esc_args[0] == 6) {
                        char buf[32];
                        sprintf(buf, "\033[%d;%dR", term->curs.y + 1,
                              term->curs.x + 1);
                        ldisc_send(term->ldisc, buf, strlen(buf), 0);
                      } else if (term->esc_args[0] == 5) {
                        ldisc_send(term->ldisc, "\033[0n", 4, 0);
                      }
                  }
                  break;
                  case 'h':       /* SM: toggle modes to high */
                  case ANSI_QUE('h'):
                  compatibility(VT100);
                  {
                      int i;
                      for (i = 0; i < term->esc_nargs; i++)
                        toggle_mode(term, term->esc_args[i],
                                  term->esc_query, TRUE);
                  }
                  break;
                  case 'i':         /* MC: Media copy */
                  case ANSI_QUE('i'):
                  compatibility(VT100);
                  {
                      if (term->esc_nargs != 1) break;
                      if (term->esc_args[0] == 5 && *term->cfg.printer) {
                        term->printing = TRUE;
                        term->only_printing = !term->esc_query;
                        term->print_state = 0;
                        term_print_setup(term);
                      } else if (term->esc_args[0] == 4 &&
                               term->printing) {
                        term_print_finish(term);
                      }
                  }
                  break;                  
                  case 'l':       /* RM: toggle modes to low */
                  case ANSI_QUE('l'):
                  compatibility(VT100);
                  {
                      int i;
                      for (i = 0; i < term->esc_nargs; i++)
                        toggle_mode(term, term->esc_args[i],
                                  term->esc_query, FALSE);
                  }
                  break;
                  case 'g':       /* TBC: clear tabs */
                  compatibility(VT100);
                  if (term->esc_nargs == 1) {
                      if (term->esc_args[0] == 0) {
                        term->tabs[term->curs.x] = FALSE;
                      } else if (term->esc_args[0] == 3) {
                        int i;
                        for (i = 0; i < term->cols; i++)
                            term->tabs[i] = FALSE;
                      }
                  }
                  break;
                  case 'r':       /* DECSTBM: set scroll margins */
                  compatibility(VT100);
                  if (term->esc_nargs <= 2) {
                      int top, bot;
                      top = def(term->esc_args[0], 1) - 1;
                      bot = (term->esc_nargs <= 1
                           || term->esc_args[1] == 0 ?
                           term->rows :
                           def(term->esc_args[1], term->rows)) - 1;
                      if (bot >= term->rows)
                        bot = term->rows - 1;
                      /* VTTEST Bug 9 - if region is less than 2 lines
                       * don't change region.
                       */
                      if (bot - top > 0) {
                        term->marg_t = top;
                        term->marg_b = bot;
                        term->curs.x = 0;
                        /*
                         * I used to think the cursor should be
                         * placed at the top of the newly marginned
                         * area. Apparently not: VMS TPU falls over
                         * if so.
                         *
                         * Well actually it should for
                         * Origin mode - RDB
                         */
                        term->curs.y = (term->dec_om ?
                                    term->marg_t : 0);
                        fix_cpos;
                        term->seen_disp_event = TRUE;
                      }
                  }
                  break;
                  case 'm':       /* SGR: set graphics rendition */
                  {
                      /* 
                       * A VT100 without the AVO only had one
                       * attribute, either underline or
                       * reverse video depending on the
                       * cursor type, this was selected by
                       * CSI 7m.
                       *
                       * case 2:
                       *  This is sometimes DIM, eg on the
                       *  GIGI and Linux
                       * case 8:
                       *  This is sometimes INVIS various ANSI.
                       * case 21:
                       *  This like 22 disables BOLD, DIM and INVIS
                       *
                       * The ANSI colours appear on any
                       * terminal that has colour (obviously)
                       * but the interaction between sgr0 and
                       * the colours varies but is usually
                       * related to the background colour
                       * erase item. The interaction between
                       * colour attributes and the mono ones
                       * is also very implementation
                       * dependent.
                       *
                       * The 39 and 49 attributes are likely
                       * to be unimplemented.
                       */
                      int i;
                      for (i = 0; i < term->esc_nargs; i++) {
                        switch (def(term->esc_args[i], 0)) {
                          case 0:   /* restore defaults */
                            term->curr_attr = term->default_attr;
                            break;
                          case 1:   /* enable bold */
                            compatibility(VT100AVO);
                            term->curr_attr |= ATTR_BOLD;
                            break;
                          case 21:  /* (enable double underline) */
                            compatibility(OTHER);
                          case 4:   /* enable underline */
                            compatibility(VT100AVO);
                            term->curr_attr |= ATTR_UNDER;
                            break;
                          case 5:   /* enable blink */
                            compatibility(VT100AVO);
                            term->curr_attr |= ATTR_BLINK;
                            break;
                          case 6:   /* SCO light bkgrd */
                            compatibility(SCOANSI);
                            term->blink_is_real = FALSE;
                            term->curr_attr |= ATTR_BLINK;
                            break;
                          case 7:   /* enable reverse video */
                            term->curr_attr |= ATTR_REVERSE;
                            break;
                          case 10:      /* SCO acs off */
                            compatibility(SCOANSI);
                            if (term->cfg.no_remote_charset) break;
                            term->sco_acs = 0; break;
                          case 11:      /* SCO acs on */
                            compatibility(SCOANSI);
                            if (term->cfg.no_remote_charset) break;
                            term->sco_acs = 1; break;
                          case 12:      /* SCO acs on, |0x80 */
                            compatibility(SCOANSI);
                            if (term->cfg.no_remote_charset) break;
                            term->sco_acs = 2; break;
                          case 22:  /* disable bold */
                            compatibility2(OTHER, VT220);
                            term->curr_attr &= ~ATTR_BOLD;
                            break;
                          case 24:  /* disable underline */
                            compatibility2(OTHER, VT220);
                            term->curr_attr &= ~ATTR_UNDER;
                            break;
                          case 25:  /* disable blink */
                            compatibility2(OTHER, VT220);
                            term->curr_attr &= ~ATTR_BLINK;
                            break;
                          case 27:  /* disable reverse video */
                            compatibility2(OTHER, VT220);
                            term->curr_attr &= ~ATTR_REVERSE;
                            break;
                          case 30:
                          case 31:
                          case 32:
                          case 33:
                          case 34:
                          case 35:
                          case 36:
                          case 37:
                            /* foreground */
                            term->curr_attr &= ~ATTR_FGMASK;
                            term->curr_attr |=
                              (term->esc_args[i] - 30)<<ATTR_FGSHIFT;
                            break;
                          case 90:
                          case 91:
                          case 92:
                          case 93:
                          case 94:
                          case 95:
                          case 96:
                          case 97:
                            /* xterm-style bright foreground */
                            term->curr_attr &= ~ATTR_FGMASK;
                            term->curr_attr |=
                              ((term->esc_args[i] - 90 + 16)
                                         << ATTR_FGSHIFT);
                            break;
                          case 39:  /* default-foreground */
                            term->curr_attr &= ~ATTR_FGMASK;
                            term->curr_attr |= ATTR_DEFFG;
                            break;
                          case 40:
                          case 41:
                          case 42:
                          case 43:
                          case 44:
                          case 45:
                          case 46:
                          case 47:
                            /* background */
                            term->curr_attr &= ~ATTR_BGMASK;
                            term->curr_attr |=
                              (term->esc_args[i] - 40)<<ATTR_BGSHIFT;
                            break;
                          case 100:
                          case 101:
                          case 102:
                          case 103:
                          case 104:
                          case 105:
                          case 106:
                          case 107:
                            /* xterm-style bright background */
                            term->curr_attr &= ~ATTR_BGMASK;
                            term->curr_attr |=
                              ((term->esc_args[i] - 100 + 16)
                                         << ATTR_BGSHIFT);
                            break;
                          case 49:  /* default-background */
                            term->curr_attr &= ~ATTR_BGMASK;
                            term->curr_attr |= ATTR_DEFBG;
                            break;
                        }
                      }
                      if (term->use_bce)
                        term->erase_char = (' ' | ATTR_ASCII |
                                        (term->curr_attr & 
                                         (ATTR_FGMASK |
                                          ATTR_BGMASK)));
                  }
                  break;
                  case 's':       /* save cursor */
                  save_cursor(term, TRUE);
                  break;
                  case 'u':       /* restore cursor */
                  save_cursor(term, FALSE);
                  term->seen_disp_event = TRUE;
                  break;
                  case 't': /* DECSLPP: set page size - ie window height */
                  /*
                   * VT340/VT420 sequence DECSLPP, DEC only allows values
                   *  24/25/36/48/72/144 other emulators (eg dtterm) use
                   * illegal values (eg first arg 1..9) for window changing 
                   * and reports.
                   */
                  if (term->esc_nargs <= 1
                      && (term->esc_args[0] < 1 ||
                        term->esc_args[0] >= 24)) {
                      compatibility(VT340TEXT);
                      if (!term->cfg.no_remote_resize)
                        request_resize(term->frontend, term->cols,
                                     def(term->esc_args[0], 24));
                      deselect(term);
                  } else if (term->esc_nargs >= 1 &&
                           term->esc_args[0] >= 1 &&
                           term->esc_args[0] < 24) {
                      compatibility(OTHER);

                      switch (term->esc_args[0]) {
                        int x, y, len;
                        char buf[80], *p;
                        case 1:
                        set_iconic(term->frontend, FALSE);
                        break;
                        case 2:
                        set_iconic(term->frontend, TRUE);
                        break;
                        case 3:
                        if (term->esc_nargs >= 3) {
                            if (!term->cfg.no_remote_resize)
                              move_window(term->frontend,
                                        def(term->esc_args[1], 0),
                                        def(term->esc_args[2], 0));
                        }
                        break;
                        case 4:
                        /* We should resize the window to a given
                         * size in pixels here, but currently our
                         * resizing code isn't healthy enough to
                         * manage it. */
                        break;
                        case 5:
                        /* move to top */
                        set_zorder(term->frontend, TRUE);
                        break;
                        case 6:
                        /* move to bottom */
                        set_zorder(term->frontend, FALSE);
                        break;
                        case 7:
                        refresh_window(term->frontend);
                        break;
                        case 8:
                        if (term->esc_nargs >= 3) {
                            if (!term->cfg.no_remote_resize)
                              request_resize(term->frontend,
                                           def(term->esc_args[2], term->cfg.width),
                                           def(term->esc_args[1], term->cfg.height));
                        }
                        break;
                        case 9:
                        if (term->esc_nargs >= 2)
                            set_zoomed(term->frontend,
                                     term->esc_args[1] ?
                                     TRUE : FALSE);
                        break;
                        case 11:
                        if (term->ldisc)
                            ldisc_send(term->ldisc,
                                     is_iconic(term->frontend) ?
                                     "\033[1t" : "\033[2t", 4, 0);
                        break;
                        case 13:
                        if (term->ldisc) {
                            get_window_pos(term->frontend, &x, &y);
                            len = sprintf(buf, "\033[3;%d;%dt", x, y);
                            ldisc_send(term->ldisc, buf, len, 0);
                        }
                        break;
                        case 14:
                        if (term->ldisc) {
                            get_window_pixels(term->frontend, &x, &y);
                            len = sprintf(buf, "\033[4;%d;%dt", x, y);
                            ldisc_send(term->ldisc, buf, len, 0);
                        }
                        break;
                        case 18:
                        if (term->ldisc) {
                            len = sprintf(buf, "\033[8;%d;%dt",
                                      term->rows, term->cols);
                            ldisc_send(term->ldisc, buf, len, 0);
                        }
                        break;
                        case 19:
                        /*
                         * Hmmm. Strictly speaking we
                         * should return `the size of the
                         * screen in characters', but
                         * that's not easy: (a) window
                         * furniture being what it is it's
                         * hard to compute, and (b) in
                         * resize-font mode maximising the
                         * window wouldn't change the
                         * number of characters. *shrug*. I
                         * think we'll ignore it for the
                         * moment and see if anyone
                         * complains, and then ask them
                         * what they would like it to do.
                         */
                        break;
                        case 20:
                        if (term->ldisc &&
                            !term->cfg.no_remote_qtitle) {
                            p = get_window_title(term->frontend, TRUE);
                            len = strlen(p);
                            ldisc_send(term->ldisc, "\033]L", 3, 0);
                            ldisc_send(term->ldisc, p, len, 0);
                            ldisc_send(term->ldisc, "\033\\", 2, 0);
                        }
                        break;
                        case 21:
                        if (term->ldisc &&
                            !term->cfg.no_remote_qtitle) {
                            p = get_window_title(term->frontend,FALSE);
                            len = strlen(p);
                            ldisc_send(term->ldisc, "\033]l", 3, 0);
                            ldisc_send(term->ldisc, p, len, 0);
                            ldisc_send(term->ldisc, "\033\\", 2, 0);
                        }
                        break;
                      }
                  }
                  break;
                  case 'S':         /* SU: Scroll up */
                  compatibility(SCOANSI);
                  scroll(term, term->marg_t, term->marg_b,
                         def(term->esc_args[0], 1), TRUE);
                  fix_cpos;
                  term->wrapnext = FALSE;
                  term->seen_disp_event = TRUE;
                  break;
                  case 'T':         /* SD: Scroll down */
                  compatibility(SCOANSI);
                  scroll(term, term->marg_t, term->marg_b,
                         -def(term->esc_args[0], 1), TRUE);
                  fix_cpos;
                  term->wrapnext = FALSE;
                  term->seen_disp_event = TRUE;
                  break;
                  case ANSI('|', '*'): /* DECSNLS */
                  /* 
                   * Set number of lines on screen
                   * VT420 uses VGA like hardware and can
                   * support any size in reasonable range
                   * (24..49 AIUI) with no default specified.
                   */
                  compatibility(VT420);
                  if (term->esc_nargs == 1 && term->esc_args[0] > 0) {
                      if (!term->cfg.no_remote_resize)
                        request_resize(term->frontend, term->cols,
                                     def(term->esc_args[0],
                                       term->cfg.height));
                      deselect(term);
                  }
                  break;
                  case ANSI('|', '$'): /* DECSCPP */
                  /*
                   * Set number of columns per page
                   * Docs imply range is only 80 or 132, but
                   * I'll allow any.
                   */
                  compatibility(VT340TEXT);
                  if (term->esc_nargs <= 1) {
                      if (!term->cfg.no_remote_resize)
                        request_resize(term->frontend,
                                     def(term->esc_args[0],
                                       term->cfg.width), term->rows);
                      deselect(term);
                  }
                  break;
                  case 'X':     /* ECH: write N spaces w/o moving cursor */
                  /* XXX VTTEST says this is vt220, vt510 manual
                   * says vt100 */
                  compatibility(ANSIMIN);
                  {
                      int n = def(term->esc_args[0], 1);
                      pos cursplus;
                      unsigned long *p = term->cpos;
                      if (n > term->cols - term->curs.x)
                        n = term->cols - term->curs.x;
                      cursplus = term->curs;
                      cursplus.x += n;
                      check_boundary(term, term->curs.x, term->curs.y);
                      check_boundary(term, term->curs.x+n, term->curs.y);
                      check_selection(term, term->curs, cursplus);
                      while (n--)
                        *p++ = term->erase_char;
                      term->seen_disp_event = TRUE;
                  }
                  break;
                  case 'x':       /* DECREQTPARM: report terminal characteristics */
                  compatibility(VT100);
                  if (term->ldisc) {
                      char buf[32];
                      int i = def(term->esc_args[0], 0);
                      if (i == 0 || i == 1) {
                        strcpy(buf, "\033[2;1;1;112;112;1;0x");
                        buf[2] += i;
                        ldisc_send(term->ldisc, buf, 20, 0);
                      }
                  }
                  break;
                  case 'Z':         /* CBT: BackTab for xterm */
                  compatibility(OTHER);
                  {
                      int i = def(term->esc_args[0], 1);
                      pos old_curs = term->curs;

                      for(;i>0 && term->curs.x>0; i--) {
                        do {
                            term->curs.x--;
                        } while (term->curs.x >0 &&
                               !term->tabs[term->curs.x]);
                      }
                      fix_cpos;
                      check_selection(term, old_curs, term->curs);
                  }
                  break;
                  case ANSI('c', '='):      /* Hide or Show Cursor */
                  compatibility(SCOANSI);
                  switch(term->esc_args[0]) {
                    case 0:  /* hide cursor */
                      term->cursor_on = FALSE;
                      break;
                    case 1:  /* restore cursor */
                      term->big_cursor = FALSE;
                      term->cursor_on = TRUE;
                      break;
                    case 2:  /* block cursor */
                      term->big_cursor = TRUE;
                      term->cursor_on = TRUE;
                      break;
                  }
                  break;
                  case ANSI('C', '='):
                  /*
                   * set cursor start on scanline esc_args[0] and
                   * end on scanline esc_args[1].If you set
                   * the bottom scan line to a value less than
                   * the top scan line, the cursor will disappear.
                   */
                  compatibility(SCOANSI);
                  if (term->esc_nargs >= 2) {
                      if (term->esc_args[0] > term->esc_args[1])
                        term->cursor_on = FALSE;
                      else
                        term->cursor_on = TRUE;
                  }
                  break;
                  case ANSI('D', '='):
                  compatibility(SCOANSI);
                  term->blink_is_real = FALSE;
                  if (term->esc_args[0]>=1)
                      term->curr_attr |= ATTR_BLINK;
                  else
                      term->curr_attr &= ~ATTR_BLINK;
                  break;
                  case ANSI('E', '='):
                  compatibility(SCOANSI);
                  term->blink_is_real = (term->esc_args[0] >= 1);
                  break;
                  case ANSI('F', '='):      /* set normal foreground */
                  compatibility(SCOANSI);
                  if (term->esc_args[0] >= 0 && term->esc_args[0] < 16) {
                      long colour =
                        (sco2ansicolour[term->esc_args[0] & 0x7] |
                         ((term->esc_args[0] & 0x8) << 1)) <<
                        ATTR_FGSHIFT;
                      term->curr_attr &= ~ATTR_FGMASK;
                      term->curr_attr |= colour;
                      term->default_attr &= ~ATTR_FGMASK;
                      term->default_attr |= colour;
                  }
                  break;
                  case ANSI('G', '='):      /* set normal background */
                  compatibility(SCOANSI);
                  if (term->esc_args[0] >= 0 && term->esc_args[0] < 16) {
                      long colour =
                        (sco2ansicolour[term->esc_args[0] & 0x7] |
                         ((term->esc_args[0] & 0x8) << 1)) <<
                        ATTR_BGSHIFT;
                      term->curr_attr &= ~ATTR_BGMASK;
                      term->curr_attr |= colour;
                      term->default_attr &= ~ATTR_BGMASK;
                      term->default_attr |= colour;
                  }
                  break;
                  case ANSI('L', '='):
                  compatibility(SCOANSI);
                  term->use_bce = (term->esc_args[0] <= 0);
                  term->erase_char = ERASE_CHAR;
                  if (term->use_bce)
                      term->erase_char = (' ' | ATTR_ASCII |
                                    (term->curr_attr & 
                                     (ATTR_FGMASK | ATTR_BGMASK)));
                  break;
                  case ANSI('p', '"'): /* DECSCL: set compat level */
                  /*
                   * Allow the host to make this emulator a
                   * 'perfect' VT102. This first appeared in
                   * the VT220, but we do need to get back to
                   * PuTTY mode so I won't check it.
                   *
                   * The arg in 40..42,50 are a PuTTY extension.
                   * The 2nd arg, 8bit vs 7bit is not checked.
                   *
                   * Setting VT102 mode should also change
                   * the Fkeys to generate PF* codes as a
                   * real VT102 has no Fkeys. The VT220 does
                   * this, F11..F13 become ESC,BS,LF other
                   * Fkeys send nothing.
                   *
                   * Note ESC c will NOT change this!
                   */

                  switch (term->esc_args[0]) {
                    case 61:
                      term->compatibility_level &= ~TM_VTXXX;
                      term->compatibility_level |= TM_VT102;
                      break;
                    case 62:
                      term->compatibility_level &= ~TM_VTXXX;
                      term->compatibility_level |= TM_VT220;
                      break;

                    default:
                      if (term->esc_args[0] > 60 &&
                        term->esc_args[0] < 70)
                        term->compatibility_level |= TM_VTXXX;
                      break;

                    case 40:
                      term->compatibility_level &= TM_VTXXX;
                      break;
                    case 41:
                      term->compatibility_level = TM_PUTTY;
                      break;
                    case 42:
                      term->compatibility_level = TM_SCOANSI;
                      break;

                    case ARG_DEFAULT:
                      term->compatibility_level = TM_PUTTY;
                      break;
                    case 50:
                      break;
                  }

                  /* Change the response to CSI c */
                  if (term->esc_args[0] == 50) {
                      int i;
                      char lbuf[64];
                      strcpy(term->id_string, "\033[?");
                      for (i = 1; i < term->esc_nargs; i++) {
                        if (i != 1)
                            strcat(term->id_string, ";");
                        sprintf(lbuf, "%d", term->esc_args[i]);
                        strcat(term->id_string, lbuf);
                      }
                      strcat(term->id_string, "c");
                  }
#if 0
                  /* Is this a good idea ? 
                   * Well we should do a soft reset at this point ...
                   */
                  if (!has_compat(VT420) && has_compat(VT100)) {
                      if (!term->cfg.no_remote_resize) {
                        if (term->reset_132)
                            request_resize(132, 24);
                        else
                            request_resize(80, 24);
                      }
                  }
#endif
                  break;
                }
            break;
            case SEEN_OSC:
            term->osc_w = FALSE;
            switch (c) {
              case 'P':        /* Linux palette sequence */
                term->termstate = SEEN_OSC_P;
                term->osc_strlen = 0;
                break;
              case 'R':        /* Linux palette reset */
                palette_reset(term->frontend);
                term_invalidate(term);
                term->termstate = TOPLEVEL;
                break;
              case 'W':        /* word-set */
                term->termstate = SEEN_OSC_W;
                term->osc_w = TRUE;
                break;
              case '0':
              case '1':
              case '2':
              case '3':
              case '4':
              case '5':
              case '6':
              case '7':
              case '8':
              case '9':
                term->esc_args[0] = 10 * term->esc_args[0] + c - '0';
                break;
              case 'L':
                /*
                 * Grotty hack to support xterm and DECterm title
                 * sequences concurrently.
                 */
                if (term->esc_args[0] == 2) {
                  term->esc_args[0] = 1;
                  break;
                }
                /* else fall through */
              default:
                term->termstate = OSC_STRING;
                term->osc_strlen = 0;
            }
            break;
            case OSC_STRING:
            /*
             * This OSC stuff is EVIL. It takes just one character to get into
             * sysline mode and it's not initially obvious how to get out.
             * So I've added CR and LF as string aborts.
             * This shouldn't effect compatibility as I believe embedded 
             * control characters are supposed to be interpreted (maybe?) 
             * and they don't display anything useful anyway.
             *
             * -- RDB
             */
            if (c == '\n' || c == '\015') {
                term->termstate = TOPLEVEL;
            } else if (c == 0234 || c == '\007') {
                /*
                 * These characters terminate the string; ST and BEL
                 * terminate the sequence and trigger instant
                 * processing of it, whereas ESC goes back to SEEN_ESC
                 * mode unless it is followed by \, in which case it is
                 * synonymous with ST in the first place.
                 */
                do_osc(term);
                term->termstate = TOPLEVEL;
            } else if (c == '\033')
                term->termstate = OSC_MAYBE_ST;
            else if (term->osc_strlen < OSC_STR_MAX)
                term->osc_string[term->osc_strlen++] = c;
            break;
            case SEEN_OSC_P:
            {
                int max = (term->osc_strlen == 0 ? 21 : 16);
                int val;
                if (c >= '0' && c <= '9')
                  val = c - '0';
                else if (c >= 'A' && c <= 'A' + max - 10)
                  val = c - 'A' + 10;
                else if (c >= 'a' && c <= 'a' + max - 10)
                  val = c - 'a' + 10;
                else {
                  term->termstate = TOPLEVEL;
                  break;
                }
                term->osc_string[term->osc_strlen++] = val;
                if (term->osc_strlen >= 7) {
                  palette_set(term->frontend, term->osc_string[0],
                            term->osc_string[1] * 16 + term->osc_string[2],
                            term->osc_string[3] * 16 + term->osc_string[4],
                            term->osc_string[5] * 16 + term->osc_string[6]);
                  term_invalidate(term);
                  term->termstate = TOPLEVEL;
                }
            }
            break;
            case SEEN_OSC_W:
            switch (c) {
              case '0':
              case '1':
              case '2':
              case '3':
              case '4':
              case '5':
              case '6':
              case '7':
              case '8':
              case '9':
                term->esc_args[0] = 10 * term->esc_args[0] + c - '0';
                break;
              default:
                term->termstate = OSC_STRING;
                term->osc_strlen = 0;
            }
            break;
            case VT52_ESC:
            term->termstate = TOPLEVEL;
            term->seen_disp_event = TRUE;
            switch (c) {
              case 'A':
                move(term, term->curs.x, term->curs.y - 1, 1);
                break;
              case 'B':
                move(term, term->curs.x, term->curs.y + 1, 1);
                break;
              case 'C':
                move(term, term->curs.x + 1, term->curs.y, 1);
                break;
              case 'D':
                move(term, term->curs.x - 1, term->curs.y, 1);
                break;
                /*
                 * From the VT100 Manual
                 * NOTE: The special graphics characters in the VT100
                 *       are different from those in the VT52
                 *
                 * From VT102 manual:
                 *       137 _  Blank             - Same
                 *       140 `  Reserved          - Humm.
                 *       141 a  Solid rectangle   - Similar
                 *       142 b  1/                - Top half of fraction for the
                 *       143 c  3/                - subscript numbers below.
                 *       144 d  5/
                 *       145 e  7/
                 *       146 f  Degrees           - Same
                 *       147 g  Plus or minus     - Same
                 *       150 h  Right arrow
                 *       151 i  Ellipsis (dots)
                 *       152 j  Divide by
                 *       153 k  Down arrow
                 *       154 l  Bar at scan 0
                 *       155 m  Bar at scan 1
                 *       156 n  Bar at scan 2
                 *       157 o  Bar at scan 3     - Similar
                 *       160 p  Bar at scan 4     - Similar
                 *       161 q  Bar at scan 5     - Similar
                 *       162 r  Bar at scan 6     - Same
                 *       163 s  Bar at scan 7     - Similar
                 *       164 t  Subscript 0
                 *       165 u  Subscript 1
                 *       166 v  Subscript 2
                 *       167 w  Subscript 3
                 *       170 x  Subscript 4
                 *       171 y  Subscript 5
                 *       172 z  Subscript 6
                 *       173 {  Subscript 7
                 *       174 |  Subscript 8
                 *       175 }  Subscript 9
                 *       176 ~  Paragraph
                 *
                 */
              case 'F':
                term->cset_attr[term->cset = 0] = ATTR_LINEDRW;
                break;
              case 'G':
                term->cset_attr[term->cset = 0] = ATTR_ASCII;
                break;
              case 'H':
                move(term, 0, 0, 0);
                break;
              case 'I':
                if (term->curs.y == 0)
                  scroll(term, 0, term->rows - 1, -1, TRUE);
                else if (term->curs.y > 0)
                  term->curs.y--;
                fix_cpos;
                term->wrapnext = FALSE;
                break;
              case 'J':
                erase_lots(term, FALSE, FALSE, TRUE);
                term->disptop = 0;
                break;
              case 'K':
                erase_lots(term, TRUE, FALSE, TRUE);
                break;
#if 0
              case 'V':
                /* XXX Print cursor line */
                break;
              case 'W':
                /* XXX Start controller mode */
                break;
              case 'X':
                /* XXX Stop controller mode */
                break;
#endif
              case 'Y':
                term->termstate = VT52_Y1;
                break;
              case 'Z':
                if (term->ldisc)
                  ldisc_send(term->ldisc, "\033/Z", 3, 0);
                break;
              case '=':
                term->app_keypad_keys = TRUE;
                break;
              case '>':
                term->app_keypad_keys = FALSE;
                break;
              case '<':
                /* XXX This should switch to VT100 mode not current or default
                 *     VT mode. But this will only have effect in a VT220+
                 *     emulation.
                 */
                term->vt52_mode = FALSE;
                term->blink_is_real = term->cfg.blinktext;
                break;
#if 0
              case '^':
                /* XXX Enter auto print mode */
                break;
              case '_':
                /* XXX Exit auto print mode */
                break;
              case ']':
                /* XXX Print screen */
                break;
#endif

#ifdef VT52_PLUS
              case 'E':
                /* compatibility(ATARI) */
                move(term, 0, 0, 0);
                erase_lots(term, FALSE, FALSE, TRUE);
                term->disptop = 0;
                break;
              case 'L':
                /* compatibility(ATARI) */
                if (term->curs.y <= term->marg_b)
                  scroll(term, term->curs.y, term->marg_b, -1, FALSE);
                break;
              case 'M':
                /* compatibility(ATARI) */
                if (term->curs.y <= term->marg_b)
                  scroll(term, term->curs.y, term->marg_b, 1, TRUE);
                break;
              case 'b':
                /* compatibility(ATARI) */
                term->termstate = VT52_FG;
                break;
              case 'c':
                /* compatibility(ATARI) */
                term->termstate = VT52_BG;
                break;
              case 'd':
                /* compatibility(ATARI) */
                erase_lots(term, FALSE, TRUE, FALSE);
                term->disptop = 0;
                break;
              case 'e':
                /* compatibility(ATARI) */
                term->cursor_on = TRUE;
                break;
              case 'f':
                /* compatibility(ATARI) */
                term->cursor_on = FALSE;
                break;
                /* case 'j': Save cursor position - broken on ST */
                /* case 'k': Restore cursor position */
              case 'l':
                /* compatibility(ATARI) */
                erase_lots(term, TRUE, TRUE, TRUE);
                term->curs.x = 0;
                term->wrapnext = FALSE;
                fix_cpos;
                break;
              case 'o':
                /* compatibility(ATARI) */
                erase_lots(term, TRUE, TRUE, FALSE);
                break;
              case 'p':
                /* compatibility(ATARI) */
                term->curr_attr |= ATTR_REVERSE;
                break;
              case 'q':
                /* compatibility(ATARI) */
                term->curr_attr &= ~ATTR_REVERSE;
                break;
              case 'v':        /* wrap Autowrap on - Wyse style */
                /* compatibility(ATARI) */
                term->wrap = 1;
                break;
              case 'w':        /* Autowrap off */
                /* compatibility(ATARI) */
                term->wrap = 0;
                break;

              case 'R':
                /* compatibility(OTHER) */
                term->vt52_bold = FALSE;
                term->curr_attr = ATTR_DEFAULT;
                if (term->use_bce)
                  term->erase_char = (' ' | ATTR_ASCII |
                                  (term->curr_attr & 
                                   (ATTR_FGMASK | ATTR_BGMASK)));
                break;
              case 'S':
                /* compatibility(VI50) */
                term->curr_attr |= ATTR_UNDER;
                break;
              case 'W':
                /* compatibility(VI50) */
                term->curr_attr &= ~ATTR_UNDER;
                break;
              case 'U':
                /* compatibility(VI50) */
                term->vt52_bold = TRUE;
                term->curr_attr |= ATTR_BOLD;
                break;
              case 'T':
                /* compatibility(VI50) */
                term->vt52_bold = FALSE;
                term->curr_attr &= ~ATTR_BOLD;
                break;
#endif
            }
            break;
            case VT52_Y1:
            term->termstate = VT52_Y2;
            move(term, term->curs.x, c - ' ', 0);
            break;
            case VT52_Y2:
            term->termstate = TOPLEVEL;
            move(term, c - ' ', term->curs.y, 0);
            break;

#ifdef VT52_PLUS
            case VT52_FG:
            term->termstate = TOPLEVEL;
            term->curr_attr &= ~ATTR_FGMASK;
            term->curr_attr &= ~ATTR_BOLD;
            term->curr_attr |= (c & 0x7) << ATTR_FGSHIFT;
            if ((c & 0x8) || term->vt52_bold)
                term->curr_attr |= ATTR_BOLD;

            if (term->use_bce)
                term->erase_char = (' ' | ATTR_ASCII |
                              (term->curr_attr &
                               (ATTR_FGMASK | ATTR_BGMASK)));
            break;
            case VT52_BG:
            term->termstate = TOPLEVEL;
            term->curr_attr &= ~ATTR_BGMASK;
            term->curr_attr &= ~ATTR_BLINK;
            term->curr_attr |= (c & 0x7) << ATTR_BGSHIFT;

            /* Note: bold background */
            if (c & 0x8)
                term->curr_attr |= ATTR_BLINK;

            if (term->use_bce)
                term->erase_char = (' ' | ATTR_ASCII |
                              (term->curr_attr &
                               (ATTR_FGMASK | ATTR_BGMASK)));
            break;
#endif
            default: break;          /* placate gcc warning about enum use */
          }
      if (term->selstate != NO_SELECTION) {
          pos cursplus = term->curs;
          incpos(cursplus);
          check_selection(term, term->curs, cursplus);
      }
    }

    term_print_flush(term);
}

#if 0
/*
 * Compare two lines to determine whether they are sufficiently
 * alike to scroll-optimise one to the other. Return the degree of
 * similarity.
 */
static int linecmp(Terminal *term, unsigned long *a, unsigned long *b)
{
    int i, n;

    for (i = n = 0; i < term->cols; i++)
      n += (*a++ == *b++);
    return n;
}
#endif

/*
 * Given a context, update the window. Out of paranoia, we don't
 * allow WM_PAINT responses to do scrolling optimisations.
 */
static void do_paint(Terminal *term, Context ctx, int may_optimise)
{
    int i, j, our_curs_y, our_curs_x;
    unsigned long rv, cursor;
    pos scrpos;
    char ch[1024];
    long cursor_background = ERASE_CHAR;
    unsigned long ticks;
#ifdef OPTIMISE_SCROLL
    struct scrollregion *sr;
#endif /* OPTIMISE_SCROLL */

    /*
     * Check the visual bell state.
     */
    if (term->in_vbell) {
      ticks = GETTICKCOUNT();
      if (ticks - term->vbell_startpoint >= VBELL_TIMEOUT)
          term->in_vbell = FALSE; 
   }

    rv = (!term->rvideo ^ !term->in_vbell ? ATTR_REVERSE : 0);

    /* Depends on:
     * screen array, disptop, scrtop,
     * selection, rv, 
     * cfg.blinkpc, blink_is_real, tblinker, 
     * curs.y, curs.x, blinker, cfg.blink_cur, cursor_on, has_focus, wrapnext
     */

    /* Has the cursor position or type changed ? */
    if (term->cursor_on) {
      if (term->has_focus) {
          if (term->blinker || !term->cfg.blink_cur)
            cursor = TATTR_ACTCURS;
          else
            cursor = 0;
      } else
          cursor = TATTR_PASCURS;
      if (term->wrapnext)
          cursor |= TATTR_RIGHTCURS;
    } else
      cursor = 0;
    our_curs_y = term->curs.y - term->disptop;
    {
      /*
       * Adjust the cursor position in the case where it's
       * resting on the right-hand half of a CJK wide character.
       * xterm's behaviour here, which seems adequate to me, is
       * to display the cursor covering the _whole_ character,
       * exactly as if it were one space to the left.
       */
      unsigned long *ldata = lineptr(term->curs.y);
      our_curs_x = term->curs.x;
      if (our_curs_x > 0 &&
          (ldata[our_curs_x] & (CHAR_MASK | CSET_MASK)) == UCSWIDE)
          our_curs_x--;
    }

    if (term->dispcurs && (term->curstype != cursor ||
                     term->dispcurs !=
                     term->disptext + our_curs_y * (term->cols + 1) +
                     our_curs_x)) {
      if (term->dispcurs > term->disptext && 
          (*term->dispcurs & (CHAR_MASK | CSET_MASK)) == UCSWIDE)
          term->dispcurs[-1] |= ATTR_INVALID;
      if ( (term->dispcurs[1] & (CHAR_MASK | CSET_MASK)) == UCSWIDE)
          term->dispcurs[1] |= ATTR_INVALID;
      *term->dispcurs |= ATTR_INVALID;
      term->curstype = 0;
    }
    term->dispcurs = NULL;

#ifdef OPTIMISE_SCROLL
    /* Do scrolls */
    sr = term->scrollhead;
    while (sr) {
      struct scrollregion *next = sr->next;
      do_scroll(ctx, sr->topline, sr->botline, sr->lines);
      sfree(sr);
      sr = next;
    }
    term->scrollhead = term->scrolltail = NULL;
#endif /* OPTIMISE_SCROLL */

    /* The normal screen data */
    for (i = 0; i < term->rows; i++) {
      unsigned long *ldata;
      int lattr;
      int idx, dirty_line, dirty_run, selected;
      unsigned long attr = 0;
      int updated_line = 0;
      int start = 0;
      int ccount = 0;
      int last_run_dirty = 0;

      scrpos.y = i + term->disptop;
      ldata = lineptr(scrpos.y);
      lattr = (ldata[term->cols] & LATTR_MODE);

      idx = i * (term->cols + 1);
      dirty_run = dirty_line = (ldata[term->cols] !=
                          term->disptext[idx + term->cols]);
      term->disptext[idx + term->cols] = ldata[term->cols];

      for (j = 0; j < term->cols; j++, idx++) {
          unsigned long tattr, tchar;
          unsigned long *d = ldata + j;
          int break_run;
          scrpos.x = j;

          tchar = (*d & (CHAR_MASK | CSET_MASK));
          tattr = (*d & (ATTR_MASK ^ CSET_MASK));
          switch (tchar & CSET_MASK) {
            case ATTR_ASCII:
            tchar = term->ucsdata->unitab_line[tchar & 0xFF];
            break;
            case ATTR_LINEDRW:
            tchar = term->ucsdata->unitab_xterm[tchar & 0xFF];
            break;
            case ATTR_SCOACS:  
            tchar = term->ucsdata->unitab_scoacs[tchar&0xFF]; 
            break;
          }
          tattr |= (tchar & CSET_MASK);
          tchar &= CHAR_MASK;
          if (j < term->cols-1 &&
            (d[1] & (CHAR_MASK | CSET_MASK)) == UCSWIDE)
            tattr |= ATTR_WIDE;

          /* Video reversing things */
          if (term->selstate == DRAGGING || term->selstate == SELECTED) {
            if (term->seltype == LEXICOGRAPHIC)
                selected = (posle(term->selstart, scrpos) &&
                        poslt(scrpos, term->selend));
            else
                selected = (posPle(term->selstart, scrpos) &&
                        posPlt(scrpos, term->selend));
          } else
            selected = FALSE;
          tattr = (tattr ^ rv
                 ^ (selected ? ATTR_REVERSE : 0));

          /* 'Real' blinking ? */
          if (term->blink_is_real && (tattr & ATTR_BLINK)) {
            if (term->has_focus && term->tblinker) {
                tchar = term->ucsdata->unitab_line[(unsigned char)' '];
            }
            tattr &= ~ATTR_BLINK;
          }

          /*
           * Check the font we'll _probably_ be using to see if 
           * the character is wide when we don't want it to be.
           */
          if ((tchar | tattr) != (term->disptext[idx]& ~ATTR_NARROW)) {
            if ((tattr & ATTR_WIDE) == 0 && 
                char_width(ctx, (tchar | tattr) & 0xFFFF) == 2)
                tattr |= ATTR_NARROW;
          } else if (term->disptext[idx]&ATTR_NARROW)
            tattr |= ATTR_NARROW;

          /* Cursor here ? Save the 'background' */
          if (i == our_curs_y && j == our_curs_x) {
            cursor_background = tattr | tchar;
            term->dispcurs = term->disptext + idx;
          }

          if ((term->disptext[idx] ^ tattr) & ATTR_WIDE)
            dirty_line = TRUE;

          break_run = (((tattr ^ attr) & term->attr_mask) ||
            j - start >= sizeof(ch));

          /* Special hack for VT100 Linedraw glyphs */
          if ((attr & CSET_MASK) == 0x2300 && tchar >= 0xBA
            && tchar <= 0xBD) break_run = TRUE;

          if (!term->ucsdata->dbcs_screenfont && !dirty_line) {
            if ((tchar | tattr) == term->disptext[idx])
                break_run = TRUE;
            else if (!dirty_run && ccount == 1)
                break_run = TRUE;
          }

          if (break_run) {
            if ((dirty_run || last_run_dirty) && ccount > 0) {
                do_text(ctx, start, i, ch, ccount, attr, lattr);
                updated_line = 1;
            }
            start = j;
            ccount = 0;
            attr = tattr;
            if (term->ucsdata->dbcs_screenfont)
                last_run_dirty = dirty_run;
            dirty_run = dirty_line;
          }

          if ((tchar | tattr) != term->disptext[idx])
            dirty_run = TRUE;
          ch[ccount++] = (char) tchar;
          term->disptext[idx] = tchar | tattr;

          /* If it's a wide char step along to the next one. */
          if (tattr & ATTR_WIDE) {
            if (++j < term->cols) {
                idx++;
                d++;
                /*
                 * By construction above, the cursor should not
                 * be on the right-hand half of this character.
                 * Ever.
                 */
                assert(!(i == our_curs_y && j == our_curs_x));
                if (term->disptext[idx] != *d)
                  dirty_run = TRUE;
                term->disptext[idx] = *d;
            }
          }
      }
      if (dirty_run && ccount > 0) {
          do_text(ctx, start, i, ch, ccount, attr, lattr);
          updated_line = 1;
      }

      /* Cursor on this line ? (and changed) */
      if (i == our_curs_y && (term->curstype != cursor || updated_line)) {
          ch[0] = (char) (cursor_background & CHAR_MASK);
          attr = (cursor_background & ATTR_MASK) | cursor;
          do_cursor(ctx, our_curs_x, i, ch, 1, attr, lattr);
          term->curstype = cursor;
      }
    }
}

/*
 * Flick the switch that says if blinking things should be shown or hidden.
 */

void term_blink(Terminal *term, int flg)
{
    long now, blink_diff;

    now = GETTICKCOUNT();
    blink_diff = now - term->last_tblink;

    /* Make sure the text blinks no more than 2Hz; we'll use 0.45 s period. */
    if (blink_diff < 0 || blink_diff > (TICKSPERSEC * 9 / 20)) {
      term->last_tblink = now;
      term->tblinker = !term->tblinker;
    }

    if (flg) {
      term->blinker = 1;
      term->last_blink = now;
      return;
    }

    blink_diff = now - term->last_blink;

    /* Make sure the cursor blinks no faster than system blink rate */
    if (blink_diff >= 0 && blink_diff < (long) CURSORBLINK)
      return;

    term->last_blink = now;
    term->blinker = !term->blinker;
}

/*
 * Invalidate the whole screen so it will be repainted in full.
 */
void term_invalidate(Terminal *term)
{
    int i;

    for (i = 0; i < term->rows * (term->cols + 1); i++)
      term->disptext[i] = ATTR_INVALID;
}

/*
 * Paint the window in response to a WM_PAINT message.
 */
void term_paint(Terminal *term, Context ctx,
            int left, int top, int right, int bottom, int immediately)
{
    int i, j;
    if (left < 0) left = 0;
    if (top < 0) top = 0;
    if (right >= term->cols) right = term->cols-1;
    if (bottom >= term->rows) bottom = term->rows-1;

    for (i = top; i <= bottom && i < term->rows; i++) {
      if ((term->disptext[i * (term->cols + 1) + term->cols] &
           LATTR_MODE) == LATTR_NORM)
          for (j = left; j <= right && j < term->cols; j++)
            term->disptext[i * (term->cols + 1) + j] = ATTR_INVALID;
      else
          for (j = left / 2; j <= right / 2 + 1 && j < term->cols; j++)
            term->disptext[i * (term->cols + 1) + j] = ATTR_INVALID;
    }

    /* This should happen soon enough, also for some reason it sometimes 
     * fails to actually do anything when re-sizing ... painting the wrong
     * window perhaps ?
     */
    if (immediately)
        do_paint (term, ctx, FALSE);
}

/*
 * Attempt to scroll the scrollback. The second parameter gives the
 * position we want to scroll to; the first is +1 to denote that
 * this position is relative to the beginning of the scrollback, -1
 * to denote it is relative to the end, and 0 to denote that it is
 * relative to the current position.
 */
void term_scroll(Terminal *term, int rel, int where)
{
    int sbtop = -sblines(term);
#ifdef OPTIMISE_SCROLL
    int olddisptop = term->disptop;
    int shift;
#endif /* OPTIMISE_SCROLL */

    term->disptop = (rel < 0 ? 0 : rel > 0 ? sbtop : term->disptop) + where;
    if (term->disptop < sbtop)
      term->disptop = sbtop;
    if (term->disptop > 0)
      term->disptop = 0;
    update_sbar(term);
#ifdef OPTIMISE_SCROLL
    shift = (term->disptop - olddisptop);
    if (shift < term->rows && shift > -term->rows)
      scroll_display(term, 0, term->rows - 1, shift);
#endif /* OPTIMISE_SCROLL */
    term_update(term);
}

static void clipme(Terminal *term, pos top, pos bottom, int rect, int desel)
{
    wchar_t *workbuf;
    wchar_t *wbptr;                  /* where next char goes within workbuf */
    int old_top_x;
    int wblen = 0;                   /* workbuf len */
    int buflen;                      /* amount of memory allocated to workbuf */

    buflen = 5120;                   /* Default size */
    workbuf = snewn(buflen, wchar_t);
    wbptr = workbuf;                 /* start filling here */
    old_top_x = top.x;               /* needed for rect==1 */

    while (poslt(top, bottom)) {
      int nl = FALSE;
      unsigned long *ldata = lineptr(top.y);
      pos nlpos;

      /*
       * nlpos will point at the maximum position on this line we
       * should copy up to. So we start it at the end of the
       * line...
       */
      nlpos.y = top.y;
      nlpos.x = term->cols;

      /*
       * ... move it backwards if there's unused space at the end
       * of the line (and also set `nl' if this is the case,
       * because in normal selection mode this means we need a
       * newline at the end)...
       */
      if (!(ldata[term->cols] & LATTR_WRAPPED)) {
          while (((ldata[nlpos.x - 1] & 0xFF) == 0x20 ||
                (DIRECT_CHAR(ldata[nlpos.x - 1]) &&
                 (ldata[nlpos.x - 1] & CHAR_MASK) == 0x20))
               && poslt(top, nlpos))
            decpos(nlpos);
          if (poslt(nlpos, bottom))
            nl = TRUE;
      } else if (ldata[term->cols] & LATTR_WRAPPED2) {
          /* Ignore the last char on the line in a WRAPPED2 line. */
          decpos(nlpos);
      }

      /*
       * ... and then clip it to the terminal x coordinate if
       * we're doing rectangular selection. (In this case we
       * still did the above, so that copying e.g. the right-hand
       * column from a table doesn't fill with spaces on the
       * right.)
       */
      if (rect) {
          if (nlpos.x > bottom.x)
            nlpos.x = bottom.x;
          nl = (top.y < bottom.y);
      }

      while (poslt(top, bottom) && poslt(top, nlpos)) {
#if 0
          char cbuf[16], *p;
          sprintf(cbuf, "<U+%04x>", (ldata[top.x] & 0xFFFF));
#else
          wchar_t cbuf[16], *p;
          int uc = (ldata[top.x] & 0xFFFF);
          int set, c;

          if (uc == UCSWIDE) {
            top.x++;
            continue;
          }

          switch (uc & CSET_MASK) {
            case ATTR_LINEDRW:
            if (!term->cfg.rawcnp) {
                uc = term->ucsdata->unitab_xterm[uc & 0xFF];
                break;
            }
            case ATTR_ASCII:
            uc = term->ucsdata->unitab_line[uc & 0xFF];
            break;
            case ATTR_SCOACS:  
            uc = term->ucsdata->unitab_scoacs[uc&0xFF]; 
            break;
          }
          switch (uc & CSET_MASK) {
            case ATTR_ACP:
            uc = term->ucsdata->unitab_font[uc & 0xFF];
            break;
            case ATTR_OEMCP:
            uc = term->ucsdata->unitab_oemcp[uc & 0xFF];
            break;
          }

          set = (uc & CSET_MASK);
          c = (uc & CHAR_MASK);
          cbuf[0] = uc;
          cbuf[1] = 0;

          if (DIRECT_FONT(uc)) {
            if (c >= ' ' && c != 0x7F) {
                char buf[4];
                WCHAR wbuf[4];
                int rv;
                if (is_dbcs_leadbyte(term->ucsdata->font_codepage, (BYTE) c)) {
                  buf[0] = c;
                  buf[1] = (char) (0xFF & ldata[top.x + 1]);
                  rv = mb_to_wc(term->ucsdata->font_codepage, 0, buf, 2, wbuf, 4);
                  top.x++;
                } else {
                  buf[0] = c;
                  rv = mb_to_wc(term->ucsdata->font_codepage, 0, buf, 1, wbuf, 4);
                }

                if (rv > 0) {
                  memcpy(cbuf, wbuf, rv * sizeof(wchar_t));
                  cbuf[rv] = 0;
                }
            }
          }
#endif

          for (p = cbuf; *p; p++) {
            /* Enough overhead for trailing NL and nul */
            if (wblen >= buflen - 16) {
                buflen += 100;
                workbuf = sresize(workbuf, buflen, wchar_t);
                wbptr = workbuf + wblen;
            }
            wblen++;
            *wbptr++ = *p;
          }
          top.x++;
      }
      if (nl) {
          int i;
          for (i = 0; i < sel_nl_sz; i++) {
            wblen++;
            *wbptr++ = sel_nl[i];
          }
      }
      top.y++;
      top.x = rect ? old_top_x : 0;
    }
#if SELECTION_NUL_TERMINATED
    wblen++;
    *wbptr++ = 0;
#endif
    write_clip(term->frontend, workbuf, wblen, desel); /* transfer to clipbd */
    if (buflen > 0)                  /* indicates we allocated this buffer */
      sfree(workbuf);
}

void term_copyall(Terminal *term)
{
    pos top;
    pos bottom;
    tree234 *screen = term->screen;
    top.y = -sblines(term);
    top.x = 0;
    bottom.y = find_last_nonempty_line(term, screen);
    bottom.x = term->cols;
    clipme(term, top, bottom, 0, TRUE);
}

/*
 * The wordness array is mainly for deciding the disposition of the
 * US-ASCII characters.
 */
static int wordtype(Terminal *term, int uc)
{
    struct ucsword {
      int start, end, ctype;
    };
    static const struct ucsword ucs_words[] = {
      {
      128, 160, 0}, {
      161, 191, 1}, {
      215, 215, 1}, {
      247, 247, 1}, {
      0x037e, 0x037e, 1},            /* Greek question mark */
      {
      0x0387, 0x0387, 1},            /* Greek ano teleia */
      {
      0x055a, 0x055f, 1},            /* Armenian punctuation */
      {
      0x0589, 0x0589, 1},            /* Armenian full stop */
      {
      0x0700, 0x070d, 1},            /* Syriac punctuation */
      {
      0x104a, 0x104f, 1},            /* Myanmar punctuation */
      {
      0x10fb, 0x10fb, 1},            /* Georgian punctuation */
      {
      0x1361, 0x1368, 1},            /* Ethiopic punctuation */
      {
      0x166d, 0x166e, 1},            /* Canadian Syl. punctuation */
      {
      0x17d4, 0x17dc, 1},            /* Khmer punctuation */
      {
      0x1800, 0x180a, 1},            /* Mongolian punctuation */
      {
      0x2000, 0x200a, 0},            /* Various spaces */
      {
      0x2070, 0x207f, 2},            /* superscript */
      {
      0x2080, 0x208f, 2},            /* subscript */
      {
      0x200b, 0x27ff, 1},            /* punctuation and symbols */
      {
      0x3000, 0x3000, 0},            /* ideographic space */
      {
      0x3001, 0x3020, 1},            /* ideographic punctuation */
      {
      0x303f, 0x309f, 3},            /* Hiragana */
      {
      0x30a0, 0x30ff, 3},            /* Katakana */
      {
      0x3300, 0x9fff, 3},            /* CJK Ideographs */
      {
      0xac00, 0xd7a3, 3},            /* Hangul Syllables */
      {
      0xf900, 0xfaff, 3},            /* CJK Ideographs */
      {
      0xfe30, 0xfe6b, 1},            /* punctuation forms */
      {
      0xff00, 0xff0f, 1},            /* half/fullwidth ASCII */
      {
      0xff1a, 0xff20, 1},            /* half/fullwidth ASCII */
      {
      0xff3b, 0xff40, 1},            /* half/fullwidth ASCII */
      {
      0xff5b, 0xff64, 1},            /* half/fullwidth ASCII */
      {
      0xfff0, 0xffff, 0},            /* half/fullwidth ASCII */
      {
      0, 0, 0}
    };
    const struct ucsword *wptr;

    uc &= (CSET_MASK | CHAR_MASK);

    switch (uc & CSET_MASK) {
      case ATTR_LINEDRW:
      uc = term->ucsdata->unitab_xterm[uc & 0xFF];
      break;
      case ATTR_ASCII:
      uc = term->ucsdata->unitab_line[uc & 0xFF];
      break;
      case ATTR_SCOACS:  
      uc = term->ucsdata->unitab_scoacs[uc&0xFF]; 
      break;
    }
    switch (uc & CSET_MASK) {
      case ATTR_ACP:
      uc = term->ucsdata->unitab_font[uc & 0xFF];
      break;
      case ATTR_OEMCP:
      uc = term->ucsdata->unitab_oemcp[uc & 0xFF];
      break;
    }

    /* For DBCS font's I can't do anything usefull. Even this will sometimes
     * fail as there's such a thing as a double width space. :-(
     */
    if (term->ucsdata->dbcs_screenfont &&
      term->ucsdata->font_codepage == term->ucsdata->line_codepage)
      return (uc != ' ');

    if (uc < 0x80)
      return term->wordness[uc];

    for (wptr = ucs_words; wptr->start; wptr++) {
      if (uc >= wptr->start && uc <= wptr->end)
          return wptr->ctype;
    }

    return 2;
}

/*
 * Spread the selection outwards according to the selection mode.
 */
static pos sel_spread_half(Terminal *term, pos p, int dir)
{
    unsigned long *ldata;
    short wvalue;
    int topy = -sblines(term);

    ldata = lineptr(p.y);

    switch (term->selmode) {
      case SM_CHAR:
      /*
       * In this mode, every character is a separate unit, except
       * for runs of spaces at the end of a non-wrapping line.
       */
      if (!(ldata[term->cols] & LATTR_WRAPPED)) {
          unsigned long *q = ldata + term->cols;
          while (q > ldata && (q[-1] & CHAR_MASK) == 0x20)
            q--;
          if (q == ldata + term->cols)
            q--;
          if (p.x >= q - ldata)
            p.x = (dir == -1 ? q - ldata : term->cols - 1);
      }
      break;
      case SM_WORD:
      /*
       * In this mode, the units are maximal runs of characters
       * whose `wordness' has the same value.
       */
      wvalue = wordtype(term, UCSGET(ldata, p.x));
      if (dir == +1) {
          while (1) {
            int maxcols = (ldata[term->cols] & LATTR_WRAPPED2 ?
                         term->cols-1 : term->cols);
            if (p.x < maxcols-1) {
                if (wordtype(term, UCSGET(ldata, p.x + 1)) == wvalue)
                  p.x++;
                else
                  break;
            } else {
                if (ldata[term->cols] & LATTR_WRAPPED) {
                  unsigned long *ldata2;
                  ldata2 = lineptr(p.y+1);
                  if (wordtype(term, UCSGET(ldata2, 0)) == wvalue) {
                      p.x = 0;
                      p.y++;
                      ldata = ldata2;
                  } else
                      break;
                } else
                  break;
            }
          }
      } else {
          while (1) {
            if (p.x > 0) {
                if (wordtype(term, UCSGET(ldata, p.x - 1)) == wvalue)
                  p.x--;
                else
                  break;
            } else {
                unsigned long *ldata2;
                int maxcols;
                if (p.y <= topy)
                  break;
                ldata2 = lineptr(p.y-1);
                maxcols = (ldata2[term->cols] & LATTR_WRAPPED2 ?
                        term->cols-1 : term->cols);
                if (ldata2[term->cols] & LATTR_WRAPPED) {
                  if (wordtype(term, UCSGET(ldata2, maxcols-1))
                      == wvalue) {
                      p.x = maxcols-1;
                      p.y--;
                      ldata = ldata2;
                  } else
                      break;
                } else
                  break;
            }
          }
      }
      break;
      case SM_LINE:
      /*
       * In this mode, every line is a unit.
       */
      p.x = (dir == -1 ? 0 : term->cols - 1);
      break;
    }
    return p;
}

static void sel_spread(Terminal *term)
{
    if (term->seltype == LEXICOGRAPHIC) {
      term->selstart = sel_spread_half(term, term->selstart, -1);
      decpos(term->selend);
      term->selend = sel_spread_half(term, term->selend, +1);
      incpos(term->selend);
    }
}

void term_do_paste(Terminal *term)
{
    wchar_t *data;
    int len;

    get_clip(term->frontend, &data, &len);
    if (data && len > 0) {
        wchar_t *p, *q;

      term_seen_key_event(term);     /* pasted data counts */

        if (term->paste_buffer)
            sfree(term->paste_buffer);
        term->paste_pos = term->paste_hold = term->paste_len = 0;
        term->paste_buffer = snewn(len, wchar_t);

        p = q = data;
        while (p < data + len) {
            while (p < data + len &&
                   !(p <= data + len - sel_nl_sz &&
                     !memcmp(p, sel_nl, sizeof(sel_nl))))
                p++;

            {
                int i;
                for (i = 0; i < p - q; i++) {
                    term->paste_buffer[term->paste_len++] = q[i];
                }
            }

            if (p <= data + len - sel_nl_sz &&
                !memcmp(p, sel_nl, sizeof(sel_nl))) {
                term->paste_buffer[term->paste_len++] = '\015';
                p += sel_nl_sz;
            }
            q = p;
        }

        /* Assume a small paste will be OK in one go. */
        if (term->paste_len < 256) {
            if (term->ldisc)
            luni_send(term->ldisc, term->paste_buffer, term->paste_len, 0);
            if (term->paste_buffer)
                sfree(term->paste_buffer);
            term->paste_buffer = 0;
            term->paste_pos = term->paste_hold = term->paste_len = 0;
        }
    }
    get_clip(term->frontend, NULL, NULL);
}

void term_mouse(Terminal *term, Mouse_Button braw, Mouse_Button bcooked,
            Mouse_Action a, int x, int y, int shift, int ctrl, int alt)
{
    pos selpoint;
    unsigned long *ldata;
    int raw_mouse = (term->xterm_mouse &&
                 !term->cfg.no_mouse_rep &&
                 !(term->cfg.mouse_override && shift));
    int default_seltype;

    if (y < 0) {
      y = 0;
      if (a == MA_DRAG && !raw_mouse)
          term_scroll(term, 0, -1);
    }
    if (y >= term->rows) {
      y = term->rows - 1;
      if (a == MA_DRAG && !raw_mouse)
          term_scroll(term, 0, +1);
    }
    if (x < 0) {
      if (y > 0) {
          x = term->cols - 1;
          y--;
      } else
          x = 0;
    }
    if (x >= term->cols)
      x = term->cols - 1;

    selpoint.y = y + term->disptop;
    selpoint.x = x;
    ldata = lineptr(selpoint.y);
    if ((ldata[term->cols] & LATTR_MODE) != LATTR_NORM)
      selpoint.x /= 2;

    if (raw_mouse) {
      int encstate = 0, r, c;
      char abuf[16];

      if (term->ldisc) {

          switch (braw) {
            case MBT_LEFT:
            encstate = 0x20;         /* left button down */
            break;
            case MBT_MIDDLE:
            encstate = 0x21;
            break;
            case MBT_RIGHT:
            encstate = 0x22;
            break;
            case MBT_WHEEL_UP:
            encstate = 0x60;
            break;
            case MBT_WHEEL_DOWN:
            encstate = 0x61;
            break;
            default: break;          /* placate gcc warning about enum use */
          }
          switch (a) {
            case MA_DRAG:
            if (term->xterm_mouse == 1)
                return;
            encstate += 0x20;
            break;
            case MA_RELEASE:
            encstate = 0x23;
            term->mouse_is_down = 0;
            break;
            case MA_CLICK:
            if (term->mouse_is_down == braw)
                return;
            term->mouse_is_down = braw;
            break;
            default: break;          /* placate gcc warning about enum use */
          }
          if (shift)
            encstate += 0x04;
          if (ctrl)
            encstate += 0x10;
          r = y + 33;
          c = x + 33;

          sprintf(abuf, "\033[M%c%c%c", encstate, c, r);
          ldisc_send(term->ldisc, abuf, 6, 0);
      }
      return;
    }

    /*
     * Set the selection type (rectangular or normal) at the start
     * of a selection attempt, from the state of Alt.
     */
    if (!alt ^ !term->cfg.rect_select)
      default_seltype = RECTANGULAR;
    else
      default_seltype = LEXICOGRAPHIC;
      
    if (term->selstate == NO_SELECTION) {
      term->seltype = default_seltype;
    }

    if (bcooked == MBT_SELECT && a == MA_CLICK) {
      deselect(term);
      term->selstate = ABOUT_TO;
      term->seltype = default_seltype;
      term->selanchor = selpoint;
      term->selmode = SM_CHAR;
    } else if (bcooked == MBT_SELECT && (a == MA_2CLK || a == MA_3CLK)) {
      deselect(term);
      term->selmode = (a == MA_2CLK ? SM_WORD : SM_LINE);
      term->selstate = DRAGGING;
      term->selstart = term->selanchor = selpoint;
      term->selend = term->selstart;
      incpos(term->selend);
      sel_spread(term);
    } else if ((bcooked == MBT_SELECT && a == MA_DRAG) ||
             (bcooked == MBT_EXTEND && a != MA_RELEASE)) {
      if (term->selstate == ABOUT_TO && poseq(term->selanchor, selpoint))
          return;
      if (bcooked == MBT_EXTEND && a != MA_DRAG &&
          term->selstate == SELECTED) {
          if (term->seltype == LEXICOGRAPHIC) {
            /*
             * For normal selection, we extend by moving
             * whichever end of the current selection is closer
             * to the mouse.
             */
            if (posdiff(selpoint, term->selstart) <
                posdiff(term->selend, term->selstart) / 2) {
                term->selanchor = term->selend;
                decpos(term->selanchor);
            } else {
                term->selanchor = term->selstart;
            }
          } else {
            /*
             * For rectangular selection, we have a choice of
             * _four_ places to put selanchor and selpoint: the
             * four corners of the selection.
             */
            if (2*selpoint.x < term->selstart.x + term->selend.x)
                term->selanchor.x = term->selend.x-1;
            else
                term->selanchor.x = term->selstart.x;

            if (2*selpoint.y < term->selstart.y + term->selend.y)
                term->selanchor.y = term->selend.y;
            else
                term->selanchor.y = term->selstart.y;
          }
          term->selstate = DRAGGING;
      }
      if (term->selstate != ABOUT_TO && term->selstate != DRAGGING)
          term->selanchor = selpoint;
      term->selstate = DRAGGING;
      if (term->seltype == LEXICOGRAPHIC) {
          /*
           * For normal selection, we set (selstart,selend) to
           * (selpoint,selanchor) in some order.
           */
          if (poslt(selpoint, term->selanchor)) {
            term->selstart = selpoint;
            term->selend = term->selanchor;
            incpos(term->selend);
          } else {
            term->selstart = term->selanchor;
            term->selend = selpoint;
            incpos(term->selend);
          }
      } else {
          /*
           * For rectangular selection, we may need to
           * interchange x and y coordinates (if the user has
           * dragged in the -x and +y directions, or vice versa).
           */
          term->selstart.x = min(term->selanchor.x, selpoint.x);
          term->selend.x = 1+max(term->selanchor.x, selpoint.x);
          term->selstart.y = min(term->selanchor.y, selpoint.y);
          term->selend.y =   max(term->selanchor.y, selpoint.y);
      }
      sel_spread(term);
    } else if ((bcooked == MBT_SELECT || bcooked == MBT_EXTEND) &&
             a == MA_RELEASE) {
      if (term->selstate == DRAGGING) {
          /*
           * We've completed a selection. We now transfer the
           * data to the clipboard.
           */
          clipme(term, term->selstart, term->selend,
               (term->seltype == RECTANGULAR), FALSE);
          term->selstate = SELECTED;
      } else
          term->selstate = NO_SELECTION;
    } else if (bcooked == MBT_PASTE
             && (a == MA_CLICK
#if MULTICLICK_ONLY_EVENT
               || a == MA_2CLK || a == MA_3CLK
#endif
               )) {
      request_paste(term->frontend);
    }

    term_update(term);
}

void term_key(Terminal *term, Key_Sym keysym, wchar_t *text, size_t tlen,
            unsigned int modifiers, unsigned int flags)
{
    char output[10];
    char *p = output;
    int prependesc = FALSE;
#if 0
    int i;

    fprintf(stderr, "keysym = %d, %d chars:", keysym, tlen);
    for (i = 0; i < tlen; i++)
      fprintf(stderr, " %04x", (unsigned)text[i]);
    fprintf(stderr, "\n");
#endif

    /* XXX Num Lock */
    if ((flags & PKF_REPEAT) && term->repeat_off)
      return;

    /* Currently, Meta always just prefixes everything with ESC. */
    if (modifiers & PKM_META)
      prependesc = TRUE;
    modifiers &= ~PKM_META;

    /*
     * Alt is only used for Alt+keypad, which isn't supported yet, so
     * ignore it.
     */
    modifiers &= ~PKM_ALT;

    /* Standard local function keys */
    switch (modifiers & (PKM_SHIFT | PKM_CONTROL)) {
      case PKM_SHIFT:
      if (keysym == PK_PAGEUP)
          /* scroll up one page */;
      if (keysym == PK_PAGEDOWN)
          /* scroll down on page */;
      if (keysym == PK_INSERT)
          term_do_paste(term);
      break;
      case PKM_CONTROL:
      if (keysym == PK_PAGEUP)
          /* scroll up one line */;
      if (keysym == PK_PAGEDOWN)
          /* scroll down one line */;
      /* Control-Numlock for app-keypad mode switch */
      if (keysym == PK_PF1)
          term->app_keypad_keys ^= 1;
      break;
    }

    if (modifiers & PKM_ALT) {
      /* Alt+F4 (close) */
      /* Alt+Return (full screen) */
      /* Alt+Space (system menu) */
    }

    if (keysym == PK_NULL && (modifiers & PKM_CONTROL) && tlen == 1 &&
      text[0] >= 0x20 && text[0] <= 0x7e) {
      /* ASCII chars + Control */
      if ((text[0] >= 0x40 && text[0] <= 0x5f) ||
          (text[0] >= 0x61 && text[0] <= 0x7a))
          text[0] &= 0x1f;
      else {
          /*
           * Control-2 should return ^@ (0x00), Control-6 should return
           * ^^ (0x1E), and Control-Minus should return ^_ (0x1F). Since
           * the DOS keyboard handling did it, and we have nothing better
           * to do with the key combo in question, we'll also map
           * Control-Backquote to ^\ (0x1C).
           */
          switch (text[0]) {
            case ' ': text[0] = 0x00; break;
            case '-': text[0] = 0x1f; break;
            case '/': text[0] = 0x1f; break;
            case '2': text[0] = 0x00; break;
            case '3': text[0] = 0x1b; break;
            case '4': text[0] = 0x1c; break;
            case '5': text[0] = 0x1d; break;
            case '6': text[0] = 0x1e; break;
            case '7': text[0] = 0x1f; break;
            case '8': text[0] = 0x7f; break;
            case '`': text[0] = 0x1c; break;
          }
      }
    }

    /* Nethack keypad */
    if (term->cfg.nethack_keypad) {
      char c = 0;
      switch (keysym) {
        case PK_KP1: c = 'b'; break;
        case PK_KP2: c = 'j'; break;
        case PK_KP3: c = 'n'; break;
        case PK_KP4: c = 'h'; break;
        case PK_KP5: c = '.'; break;
        case PK_KP6: c = 'l'; break;
        case PK_KP7: c = 'y'; break;
        case PK_KP8: c = 'k'; break;
        case PK_KP9: c = 'u'; break;
        default: break; /* else gcc warns `enum value not used' */
      }
      if (c != 0) {
          if (c != '.') {
            if (modifiers & PKM_CONTROL)
                c &= 0x1f;
            else if (modifiers & PKM_SHIFT)
                c = toupper(c);
          }
          *p++ = c;
          goto done;
      }
    }

    /* Numeric Keypad */
    if (PK_ISKEYPAD(keysym)) {
      int xkey = 0;

      /*
       * In VT400 mode, PFn always emits an escape sequence.  In
       * Linux and tilde modes, this only happens in app keypad mode.
       */
      if (term->cfg.funky_type == FUNKY_VT400 ||
          ((term->cfg.funky_type == FUNKY_LINUX ||
            term->cfg.funky_type == FUNKY_TILDE) &&
           term->app_keypad_keys && !term->cfg.no_applic_k)) {
          switch (keysym) {
            case PK_PF1: xkey = 'P'; break;
            case PK_PF2: xkey = 'Q'; break;
            case PK_PF3: xkey = 'R'; break;
            case PK_PF4: xkey = 'S'; break;
            default: break; /* else gcc warns `enum value not used' */
          }
      }
      if (term->app_keypad_keys && !term->cfg.no_applic_k) {
          switch (keysym) {
            case PK_KP0: xkey = 'p'; break;
            case PK_KP1: xkey = 'q'; break;
            case PK_KP2: xkey = 'r'; break;
            case PK_KP3: xkey = 's'; break;
            case PK_KP4: xkey = 't'; break;
            case PK_KP5: xkey = 'u'; break;
            case PK_KP6: xkey = 'v'; break;
            case PK_KP7: xkey = 'w'; break;
            case PK_KP8: xkey = 'x'; break;
            case PK_KP9: xkey = 'y'; break;
            case PK_KPDECIMAL: xkey = 'n'; break;
            case PK_KPENTER: xkey = 'M'; break;
            default: break; /* else gcc warns `enum value not used' */
          }
          if (term->cfg.funky_type == FUNKY_XTERM && tlen > 0) {
            /*
             * xterm can't see the layout of the keypad, so it has
             * to rely on the X keysyms returned by the keys.
             * Hence, we look at the strings here, not the PuTTY
             * keysyms (which describe the layout).
             */
            switch (text[0]) {
              case '+':
                if (modifiers & PKM_SHIFT)
                  xkey = 'l';
                else
                  xkey = 'k';
                break;
              case '/': xkey = 'o'; break;
              case '*': xkey = 'j'; break;
              case '-': xkey = 'm'; break;
            }
          } else {
            /*
             * In all other modes, we try to retain the layout of
             * the DEC keypad in application mode.
             */
            switch (keysym) {
              case PK_KPBIGPLUS:
                /* This key covers the '-' and ',' keys on a VT220 */
                if (modifiers & PKM_SHIFT)
                  xkey = 'm'; /* VT220 '-' */
                else
                  xkey = 'l'; /* VT220 ',' */
                break;
              case PK_KPMINUS: xkey = 'm'; break;
              case PK_KPCOMMA: xkey = 'l'; break;
              default: break; /* else gcc warns `enum value not used' */
            }
          }
      }
      if (xkey) {
          if (term->vt52_mode) {
            if (xkey >= 'P' && xkey <= 'S')
                p += sprintf((char *) p, "\x1B%c", xkey);
            else
                p += sprintf((char *) p, "\x1B?%c", xkey);
          } else
            p += sprintf((char *) p, "\x1BO%c", xkey);
          goto done;
      }
      /* Not in application mode -- treat the number pad as arrow keys? */
      if ((flags & PKF_NUMLOCK) == 0) {
          switch (keysym) {
            case PK_KP0: keysym = PK_INSERT; break;
            case PK_KP1: keysym = PK_END; break;
            case PK_KP2: keysym = PK_DOWN; break;
            case PK_KP3: keysym = PK_PAGEDOWN; break;
            case PK_KP4: keysym = PK_LEFT; break;
            case PK_KP5: keysym = PK_REST; break;
            case PK_KP6: keysym = PK_RIGHT; break;
            case PK_KP7: keysym = PK_HOME; break;
            case PK_KP8: keysym = PK_UP; break;
            case PK_KP9: keysym = PK_PAGEUP; break;
            default: break; /* else gcc warns `enum value not used' */
          }
      }
    }

    /* Miscellaneous keys */
    switch (keysym) {
      case PK_ESCAPE:
      *p++ = 0x1b;
      goto done;
      case PK_BACKSPACE:
          if (modifiers == 0)
            *p++ = (term->cfg.bksp_is_delete ? 0x7F : 0x08);
          else if (modifiers == PKM_SHIFT)
            /* We do the opposite of what is configured */
            *p++ = (term->cfg.bksp_is_delete ? 0x08 : 0x7F);
          else break;
          goto done;
      case PK_TAB:
      if (modifiers == 0)
          *p++ = 0x09;
      else if (modifiers == PKM_SHIFT)
          *p++ = 0x1B, *p++ = '[', *p++ = 'Z';
      else break;
      goto done;
      /* XXX window.c has ctrl+shift+space sending 0xa0 */
      case PK_PAUSE:
      if (modifiers == PKM_CONTROL)
          *p++ = 26;
      else break;
      goto done;
      case PK_RETURN:
      case PK_KPENTER: /* Odd keypad modes handled above */
      if (modifiers == 0) {
          *p++ = 0x0d;
          if (term->cr_lf_return)
            *p++ = 0x0a;
          goto done;
      }
      default: break; /* else gcc warns `enum value not used' */
    }

    /* SCO function keys and editing keys */
    if (term->cfg.funky_type == FUNKY_SCO) {
      if (PK_ISFKEY(keysym) && keysym <= PK_F12) {
          static char const codes[] =
            "MNOPQRSTUVWX" "YZabcdefghij" "klmnopqrstuv" "wxyz@[\\]^_`{";
          int index = keysym - PK_F1;

          if (modifiers & PKM_SHIFT) index += 12;
          if (modifiers & PKM_CONTROL) index += 24;
          p += sprintf((char *) p, "\x1B[%c", codes[index]);
          goto done;
      }
      if (PK_ISEDITING(keysym)) {
          int xkey = 0;

          switch (keysym) {
            case PK_DELETE:   *p++ = 0x7f; goto done;
            case PK_HOME:     xkey = 'H'; break;
            case PK_INSERT:   xkey = 'L'; break;
            case PK_END:      xkey = 'F'; break;
            case PK_PAGEUP:   xkey = 'I'; break;
            case PK_PAGEDOWN: xkey = 'G'; break;
            default: break; /* else gcc warns `enum value not used' */
          }
          p += sprintf((char *) p, "\x1B[%c", xkey);
      }
    }

    if (PK_ISEDITING(keysym) && (modifiers & PKM_SHIFT) == 0) {
      int code;

      if (term->cfg.funky_type == FUNKY_XTERM) {
          /* Xterm shuffles these keys, apparently. */
          switch (keysym) {
            case PK_HOME:     keysym = PK_INSERT;   break;
            case PK_INSERT:   keysym = PK_HOME;     break;
            case PK_DELETE:   keysym = PK_END;      break;
            case PK_END:      keysym = PK_PAGEUP;   break;
            case PK_PAGEUP:   keysym = PK_DELETE;   break;
            case PK_PAGEDOWN: keysym = PK_PAGEDOWN; break;
            default: break; /* else gcc warns `enum value not used' */
          }
      }

      /* RXVT Home/End */
      if (term->cfg.rxvt_homeend &&
          (keysym == PK_HOME || keysym == PK_END)) {
          p += sprintf((char *) p, keysym == PK_HOME ? "\x1B[H" : "\x1BOw");
          goto done;
      }

      if (term->vt52_mode) {
          int xkey;

          /*
           * A real VT52 doesn't have these, and a VT220 doesn't
           * send anything for them in VT52 mode.
           */
          switch (keysym) {
            case PK_HOME:     xkey = 'H'; break;
            case PK_INSERT:   xkey = 'L'; break;
            case PK_DELETE:   xkey = 'M'; break;
            case PK_END:      xkey = 'E'; break;
            case PK_PAGEUP:   xkey = 'I'; break;
            case PK_PAGEDOWN: xkey = 'G'; break;
            default: xkey=0; break; /* else gcc warns `enum value not used'*/
          }
          p += sprintf((char *) p, "\x1B%c", xkey);
          goto done;
      }

      switch (keysym) {
        case PK_HOME:     code = 1; break;
        case PK_INSERT:   code = 2; break;
        case PK_DELETE:   code = 3; break;
        case PK_END:      code = 4; break;
        case PK_PAGEUP:   code = 5; break;
        case PK_PAGEDOWN: code = 6; break;
        default: code = 0; break; /* else gcc warns `enum value not used' */
      }
      p += sprintf((char *) p, "\x1B[%d~", code);
      goto done;
    }

    if (PK_ISFKEY(keysym)) {
      /* Map Shift+F1-F10 to F11-F20 */
      if (keysym >= PK_F1 && keysym <= PK_F10 && (modifiers & PKM_SHIFT))
          keysym += 10;
      if ((term->vt52_mode || term->cfg.funky_type == FUNKY_VT100P) &&
          keysym <= PK_F14) {
          /* XXX This overrides the XTERM/VT52 mode below */
          int offt = 0;
          if (keysym >= PK_F6)  offt++;
          if (keysym >= PK_F12) offt++;
          p += sprintf((char *) p, term->vt52_mode ? "\x1B%c" : "\x1BO%c",
                   'P' + keysym - PK_F1 - offt);
          goto done;
      }
      if (term->cfg.funky_type == FUNKY_LINUX && keysym <= PK_F5) {
          p += sprintf((char *) p, "\x1B[[%c", 'A' + keysym - PK_F1);
          goto done;
      }
      if (term->cfg.funky_type == FUNKY_XTERM && keysym <= PK_F4) {
          if (term->vt52_mode)
            p += sprintf((char *) p, "\x1B%c", 'P' + keysym - PK_F1);
          else
            p += sprintf((char *) p, "\x1BO%c", 'P' + keysym - PK_F1);
          goto done;
      }
      p += sprintf((char *) p, "\x1B[%d~", 11 + keysym - PK_F1);
      goto done;
    }

    if (PK_ISCURSOR(keysym)) {
      int xkey;

      switch (keysym) {
        case PK_UP:    xkey = 'A'; break;
        case PK_DOWN:  xkey = 'B'; break;
        case PK_RIGHT: xkey = 'C'; break;
        case PK_LEFT:  xkey = 'D'; break;
        case PK_REST:  xkey = 'G'; break; /* centre key on number pad */
        default: xkey = 0; break; /* else gcc warns `enum value not used' */
      }
      if (term->vt52_mode)
          p += sprintf((char *) p, "\x1B%c", xkey);
      else {
          int app_flg = (term->app_cursor_keys && !term->cfg.no_applic_c);

          /* Useful mapping of Ctrl-arrows */
          if (modifiers == PKM_CONTROL)
            app_flg = !app_flg;

          if (app_flg)
            p += sprintf((char *) p, "\x1BO%c", xkey);
          else
            p += sprintf((char *) p, "\x1B[%c", xkey);
      }
      goto done;
    }

  done:
    if (p > output || tlen > 0) {
      /*
       * Interrupt an ongoing paste. I'm not sure
       * this is sensible, but for the moment it's
       * preferable to having to faff about buffering
       * things.
       */
      term_nopaste(term);

      /*
       * We need not bother about stdin backlogs
       * here, because in GUI PuTTY we can't do
       * anything about it anyway; there's no means
       * of asking Windows to hold off on KEYDOWN
       * messages. We _have_ to buffer everything
       * we're sent.
       */
      term_seen_key_event(term);

      if (prependesc) {
#if 0
          fprintf(stderr, "sending ESC\n");
#endif
          ldisc_send(term->ldisc, "\x1b", 1, 1);
      }

      if (p > output) {
#if 0
          fprintf(stderr, "sending %d bytes:", p - output);
          for (i = 0; i < p - output; i++)
            fprintf(stderr, " %02x", output[i]);
          fprintf(stderr, "\n");
#endif
          ldisc_send(term->ldisc, output, p - output, 1);
      } else if (tlen > 0) {
#if 0
          fprintf(stderr, "sending %d unichars:", tlen);
          for (i = 0; i < tlen; i++)
            fprintf(stderr, " %04x", (unsigned) text[i]);
          fprintf(stderr, "\n");
#endif
          luni_send(term->ldisc, text, tlen, 1);
      }
    }
}

void term_nopaste(Terminal *term)
{
    if (term->paste_len == 0)
      return;
    sfree(term->paste_buffer);
    term->paste_buffer = NULL;
    term->paste_len = 0;
}

int term_paste_pending(Terminal *term)
{
    return term->paste_len != 0;
}

void term_paste(Terminal *term)
{
    long now, paste_diff;

    if (term->paste_len == 0)
      return;

    /* Don't wait forever to paste */
    if (term->paste_hold) {
      now = GETTICKCOUNT();
      paste_diff = now - term->last_paste;
      if (paste_diff >= 0 && paste_diff < 450)
          return;
    }
    term->paste_hold = 0;

    while (term->paste_pos < term->paste_len) {
      int n = 0;
      while (n + term->paste_pos < term->paste_len) {
          if (term->paste_buffer[term->paste_pos + n++] == '\015')
            break;
      }
      if (term->ldisc)
          luni_send(term->ldisc, term->paste_buffer + term->paste_pos, n, 0);
      term->paste_pos += n;

      if (term->paste_pos < term->paste_len) {
          term->paste_hold = 1;
          return;
      }
    }
    sfree(term->paste_buffer);
    term->paste_buffer = NULL;
    term->paste_len = 0;
}

static void deselect(Terminal *term)
{
    term->selstate = NO_SELECTION;
    term->selstart.x = term->selstart.y = term->selend.x = term->selend.y = 0;
}

void term_deselect(Terminal *term)
{
    deselect(term);
    term_update(term);
}

int term_ldisc(Terminal *term, int option)
{
    if (option == LD_ECHO)
      return term->term_echoing;
    if (option == LD_EDIT)
      return term->term_editing;
    return FALSE;
}

int term_data(Terminal *term, int is_stderr, const char *data, int len)
{
    bufchain_add(&term->inbuf, data, len);

    if (!term->in_term_out) {
      term->in_term_out = TRUE;
      term_blink(term, 1);
      term_out(term);
      term->in_term_out = FALSE;
    }

    /*
     * term_out() always completely empties inbuf. Therefore,
     * there's no reason at all to return anything other than zero
     * from this function, because there _can't_ be a question of
     * the remote side needing to wait until term_out() has cleared
     * a backlog.
     *
     * This is a slightly suboptimal way to deal with SSH2 - in
     * principle, the window mechanism would allow us to continue
     * to accept data on forwarded ports and X connections even
     * while the terminal processing was going slowly - but we
     * can't do the 100% right thing without moving the terminal
     * processing into a separate thread, and that might hurt
     * portability. So we manage stdout buffering the old SSH1 way:
     * if the terminal processing goes slowly, the whole SSH
     * connection stops accepting data until it's ready.
     *
     * In practice, I can't imagine this causing serious trouble.
     */
    return 0;
}

void term_provide_logctx(Terminal *term, void *logctx)
{
    term->logctx = logctx;
}

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