rxvt-unicode/src/command.C

/*--------------------------------*-C-*---------------------------------*
 * File:        command.c
 *----------------------------------------------------------------------*
 * $Id: command.C,v 1.14 2003/11/23 19:45:54 root Exp $
 *
 * All portions of code are copyright by their respective author/s.
 * Copyright (c) 1992      John Bovey, University of Kent at Canterbury <jdb@ukc.ac.uk>
 *                              - original version
 * Copyright (c) 1994      Robert Nation <nation@rocket.sanders.lockheed.com>
 *                              - extensive modifications
 * Copyright (c) 1995      Garrett D'Amore <garrett@netcom.com>
 *                              - vt100 printing
 * Copyright (c) 1995      Steven Hirsch <hirsch@emba.uvm.edu>
 *                              - X11 mouse report mode and support for
 *                                DEC "private mode" save/restore functions.
 * Copyright (c) 1995      Jakub Jelinek <jj@gnu.ai.mit.edu>
 *                              - key-related changes to handle Shift+function
 *                                keys properly.
 * Copyright (c) 1997      MJ Olesen <olesen@me.queensu.ca>
 *                              - extensive modifications
 * Copyright (c) 1997      Raul Garcia Garcia <rgg@tid.es>
 *                              - modification and cleanups for Solaris 2.x
 *                                and Linux 1.2.x
 * Copyright (c) 1997,1998 Oezguer Kesim <kesim@math.fu-berlin.de>
 * Copyright (c) 1998-2001 Geoff Wing <gcw@pobox.com>
 *                              - extensive modifications
 * Copyright (c) 1998      Alfredo K. Kojima <kojima@windowmaker.org>
 * Copyright (c) 2001      Marius Gedminas
 *                              - Ctrl/Mod4+Tab works like Meta+Tab (options)
 * Copyright (c) 2003      Rob McMullen <robm@flipturn.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *----------------------------------------------------------------------*/

/*{{{ includes: */
#include "../config.h"          /* NECESSARY */
#include "rxvt.h"               /* NECESSARY */
#include "version.h"
#include "command.h"

/*----------------------------------------------------------------------*/

/*{{{ Convert the keypress event into a string */
/* INTPROTO */
void
rxvt_lookup_key(pR_ XKeyEvent *ev)
{
    int             ctrl, meta, shft, len;
    unsigned int    newlen;
    KeySym          keysym;
#ifdef DEBUG_CMD
    static int      debug_key = 1;      /* accessible by a debugger only */
#endif
#ifdef USE_XIM
    int             valid_keysym;
#endif
    unsigned char  *kbuf = R->h->kbuf;

/*
 * use Num_Lock to toggle Keypad on/off.  If Num_Lock is off, allow an
 * escape sequence to toggle the Keypad.
 *
 * Always permit `shift' to override the current setting
 */
    shft = (ev->state & ShiftMask);
    ctrl = (ev->state & ControlMask);
    meta = (ev->state & R->h->ModMetaMask);
    if (R->numlock_state || (ev->state & R->h->ModNumLockMask)) {
        R->numlock_state = (ev->state & R->h->ModNumLockMask);
        PrivMode((!R->numlock_state), PrivMode_aplKP);
    }
#ifdef USE_XIM
    if (R->h->Input_Context != NULL) {
        Status          status_return;

        kbuf[0] = '\0';
#ifdef X_HAVE_UTF8_STRING
        len = Xutf8LookupString(R->h->Input_Context, ev, (char *)kbuf,
                              KBUFSZ, &keysym, &status_return);
#else
        len = XmbLookupString(R->h->Input_Context, ev, (char *)kbuf,
                              KBUFSZ, &keysym, &status_return);
#endif
        valid_keysym = ((status_return == XLookupKeySym)
                        || (status_return == XLookupBoth));
    } else {
        len = XLookupString(ev, (char *)kbuf, KBUFSZ, &keysym,
                            &R->h->compose);
        valid_keysym = 1;
    }
#else                           /* USE_XIM */
    len = XLookupString(ev, (char *)kbuf, KBUFSZ, &keysym,
                        &R->h->compose);
/*
 * map unmapped Latin[2-4]/Katakana/Arabic/Cyrillic/Greek entries -> Latin1
 * good for installations with correct fonts, but without XLOCALE
 */
    if (!len) {
        if ((keysym >= 0x0100) && (keysym < 0x0800)) {
            kbuf[0] = (keysym & 0xFF);
            kbuf[1] = '\0';
            len = 1;
        } else
            kbuf[0] = '\0';
    }
#endif                          /* USE_XIM */

#ifdef USE_XIM
    if (valid_keysym)
#endif
    {
/* for some backwards compatibility */
#if defined(HOTKEY_CTRL) || defined(HOTKEY_META)
# ifdef HOTKEY_CTRL
        if (ctrl) {
# else
        if (meta) {
# endif
            if (keysym == R->h->ks_bigfont) {
                rxvt_change_font(aR_ 0, FONT_UP);
                return;
            } else if (keysym == R->h->ks_smallfont) {
                rxvt_change_font(aR_ 0, FONT_DN);
                return;
            }
        }
#endif

        if (R->TermWin.saveLines) {
#ifdef UNSHIFTED_SCROLLKEYS
            if (!ctrl && !meta) {
#else
            if (IS_SCROLL_MOD) {
#endif
                int             lnsppg;

#ifdef PAGING_CONTEXT_LINES
                lnsppg = R->TermWin.nrow - PAGING_CONTEXT_LINES;
#else
                lnsppg = R->TermWin.nrow * 4 / 5;
#endif
                if (keysym == XK_Prior) {
                    rxvt_scr_page(aR_ UP, lnsppg);
                    return;
                } else if (keysym == XK_Next) {
                    rxvt_scr_page(aR_ DN, lnsppg);
                    return;
                }
            }
#ifdef SCROLL_ON_UPDOWN_KEYS
            if (IS_SCROLL_MOD) {
                if (keysym == XK_Up) {
                    rxvt_scr_page(aR_ UP, 1);
                    return;
                } else if (keysym == XK_Down) {
                    rxvt_scr_page(aR_ DN, 1);
                    return;
                }
            }
#endif
#ifdef SCROLL_ON_HOMEEND_KEYS
            if (IS_SCROLL_MOD) {
                if (keysym == XK_Home) {
                    rxvt_scr_move_to(aR_ 0, 1);
                    return;
                } else if (keysym == XK_End) {
                    rxvt_scr_move_to(aR_ 1, 0);
                    return;
                }
            }
#endif
        }

        if (shft) {
        /* Shift + F1 - F10 generates F11 - F20 */
            if (keysym >= XK_F1 && keysym <= XK_F10) {
                keysym += (XK_F11 - XK_F1);
                shft = 0;       /* turn off Shift */
            } else if (!ctrl && !meta && (R->h->PrivateModes & PrivMode_ShiftKeys)) {
                switch (keysym) {
                /* normal XTerm key bindings */
                case XK_Insert: /* Shift+Insert = paste mouse selection */
                    rxvt_selection_request(aR_ ev->time, 0, 0);
                    return;
                /* rxvt extras */
                case XK_KP_Add: /* Shift+KP_Add = bigger font */
                    rxvt_change_font(aR_ 0, FONT_UP);
                    return;
                case XK_KP_Subtract:    /* Shift+KP_Subtract = smaller font */
                    rxvt_change_font(aR_ 0, FONT_DN);
                    return;
                }
            }
        }
#ifdef PRINTPIPE
        if (keysym == XK_Print) {
            rxvt_scr_printscreen(aR_ ctrl | shft);
            return;
        }
#endif
#ifdef GREEK_SUPPORT
        if (keysym == R->h->ks_greekmodeswith) {
            R->h->greek_mode = !R->h->greek_mode;
            if (R->h->greek_mode) {
                rxvt_xterm_seq(aR_ XTerm_title,
                               (greek_getmode() == GREEK_ELOT928
                                ? "[Greek: iso]" : "[Greek: ibm]"), CHAR_ST);
                greek_reset();
            } else
                rxvt_xterm_seq(aR_ XTerm_title, APL_NAME "-" VERSION, CHAR_ST);
            return;
        }
#endif

        if (keysym >= 0xFF00 && keysym <= 0xFFFF) {
#ifdef KEYSYM_RESOURCE
            if (!(shft | ctrl) && R->h->Keysym_map[keysym & 0xFF] != NULL) {
                unsigned int    l;
                const unsigned char *kbuf0;
                const unsigned char ch = C0_ESC;

                kbuf0 = (R->h->Keysym_map[keysym & 0xFF]);
                l = (unsigned int)*kbuf0++;

            /* escape prefix */
                if (meta)
# ifdef META8_OPTION
                    if (R->h->meta_char == C0_ESC)
# endif
                        rxvt_tt_write(aR_ &ch, 1);
                rxvt_tt_write(aR_ kbuf0, l);
                return;
            } else
#endif
            {
                newlen = 1;
                switch (keysym) {
#ifndef NO_BACKSPACE_KEY
                case XK_BackSpace:
                    if (R->h->PrivateModes & PrivMode_HaveBackSpace) {
                        kbuf[0] = (!!(R->h->PrivateModes & PrivMode_BackSpace)
                                   ^ !!ctrl) ? '\b' : '\177';
                        kbuf[1] = '\0';
                    } else
                        STRCPY(kbuf, R->h->key_backspace);
# ifdef MULTICHAR_SET
                    if ((R->Options & Opt_mc_hack) && R->screen.cur.col > 0) {
                        int             col, row;

                        newlen = STRLEN(kbuf);
                        col = R->screen.cur.col - 1;
                        row = R->screen.cur.row + R->TermWin.saveLines;
                        if (IS_MULTI2(R->screen.rend[row][col]))
                            MEMMOVE(kbuf + newlen, kbuf, newlen + 1);
                    }
# endif
                    break;
#endif
#ifndef NO_DELETE_KEY
                case XK_Delete:
                    STRCPY(kbuf, R->h->key_delete);
# ifdef MULTICHAR_SET
                    if (R->Options & Opt_mc_hack) {
                        int             col, row;
 
                        newlen = STRLEN(kbuf);
                        col = R->screen.cur.col;
                        row = R->screen.cur.row + R->TermWin.saveLines;
                        if (IS_MULTI1(R->screen.rend[row][col]))
                            MEMMOVE(kbuf + newlen, kbuf, newlen + 1);
                    }
# endif
                    break;
#endif
                case XK_Tab:
                    if (shft)
                        STRCPY(kbuf, "\033[Z");
                    else {
#ifdef CTRL_TAB_MAKES_META
                        if (ctrl)
                            meta = 1;
#endif
#ifdef MOD4_TAB_MAKES_META
                        if (ev->state & Mod4Mask)
                            meta = 1;
#endif
                        newlen = 0;
                    }
                    break;


#ifdef XK_KP_Left
                case XK_KP_Up:          /* \033Ox or standard */
                case XK_KP_Down:        /* \033Or or standard */
                case XK_KP_Right:       /* \033Ov or standard */
                case XK_KP_Left:        /* \033Ot or standard */
                    if ((R->h->PrivateModes & PrivMode_aplKP) ? !shft : shft) {
                        STRCPY(kbuf, "\033OZ");
                        kbuf[2] = ("txvr"[keysym - XK_KP_Left]);
                        break;
                    } else
                    /* translate to std. cursor key */
                        keysym = XK_Left + (keysym - XK_KP_Left);
                /* FALLTHROUGH */
#endif
                case XK_Up:     /* "\033[A" */
                case XK_Down:   /* "\033[B" */
                case XK_Right:  /* "\033[C" */
                case XK_Left:   /* "\033[D" */
                    STRCPY(kbuf, "\033[Z");
                    kbuf[2] = ("DACB"[keysym - XK_Left]);
                /* do Shift first */
                    if (shft)
                        kbuf[2] = ("dacb"[keysym - XK_Left]);
                    else if (ctrl) {
                        kbuf[1] = 'O';
                        kbuf[2] = ("dacb"[keysym - XK_Left]);
                    } else if (R->h->PrivateModes & PrivMode_aplCUR)
                        kbuf[1] = 'O';
#ifdef MULTICHAR_SET
                    //TODO: ??
                    if (R->Options & Opt_mc_hack) {
                        int             col, row, m;

                        col = R->screen.cur.col;
                        row = R->screen.cur.row + R->TermWin.saveLines;
                        m = 0;
                        if (keysym == XK_Right
                            && IS_MULTI1(R->screen.rend[row][col]))
                            m = 1;
                        else if (keysym == XK_Left) {
                            if (col > 0) {
                                if (IS_MULTI2(R->screen.rend[row][col - 1]))
                                    m = 1;
                            } else if (R->screen.cur.row > 0) {
                                col = R->screen.tlen[--row];
                                if (col == -1)
                                    col = R->TermWin.ncol - 1;
                                else
                                    col--;
                                if (col > 0
                                    && IS_MULTI2(R->screen.rend[row][col]))
                                    m = 1;
                            }
                        }
                        if (m)
                            MEMMOVE(kbuf + 3, kbuf, 3 + 1);
                    }
#endif
                    break;

#ifndef UNSHIFTED_SCROLLKEYS
# ifdef XK_KP_Prior
                case XK_KP_Prior:
                /* allow shift to override */
                    if ((R->h->PrivateModes & PrivMode_aplKP) ? !shft : shft) {
                        STRCPY(kbuf, "\033Oy");
                        break;
                    }
                /* FALLTHROUGH */
# endif
                case XK_Prior:
                    STRCPY(kbuf, "\033[5~");
                    break;
# ifdef XK_KP_Next
                case XK_KP_Next:
                /* allow shift to override */
                    if ((R->h->PrivateModes & PrivMode_aplKP) ? !shft : shft) {
                        STRCPY(kbuf, "\033Os");
                        break;
                    }
                /* FALLTHROUGH */
# endif
                case XK_Next:
                    STRCPY(kbuf, "\033[6~");
                    break;
#endif
                case XK_KP_Enter:
                /* allow shift to override */
                    if ((R->h->PrivateModes & PrivMode_aplKP) ? !shft : shft) {
                        STRCPY(kbuf, "\033OM");
                    } else {
                        kbuf[0] = '\r';
                        kbuf[1] = '\0';
                    }
                    break;

#ifdef XK_KP_Begin
                case XK_KP_Begin:
                    STRCPY(kbuf, "\033Ou");
                    break;

                case XK_KP_Insert:
                    STRCPY(kbuf, "\033Op");
                    break;

                case XK_KP_Delete:
                    STRCPY(kbuf, "\033On");
                    break;
#endif
                case XK_KP_F1:  /* "\033OP" */
                case XK_KP_F2:  /* "\033OQ" */
                case XK_KP_F3:  /* "\033OR" */
                case XK_KP_F4:  /* "\033OS" */
                    STRCPY(kbuf, "\033OP");
                    kbuf[2] += (keysym - XK_KP_F1);
                    break;

                case XK_KP_Multiply:    /* "\033Oj" : "*" */
                case XK_KP_Add:         /* "\033Ok" : "+" */
                case XK_KP_Separator:   /* "\033Ol" : "," */
                case XK_KP_Subtract:    /* "\033Om" : "-" */
                case XK_KP_Decimal:     /* "\033On" : "." */
                case XK_KP_Divide:      /* "\033Oo" : "/" */
                case XK_KP_0:           /* "\033Op" : "0" */
                case XK_KP_1:           /* "\033Oq" : "1" */
                case XK_KP_2:           /* "\033Or" : "2" */
                case XK_KP_3:           /* "\033Os" : "3" */
                case XK_KP_4:           /* "\033Ot" : "4" */
                case XK_KP_5:           /* "\033Ou" : "5" */
                case XK_KP_6:           /* "\033Ov" : "6" */
                case XK_KP_7:           /* "\033Ow" : "7" */
                case XK_KP_8:           /* "\033Ox" : "8" */
                case XK_KP_9:           /* "\033Oy" : "9" */
                /* allow shift to override */
                    if ((R->h->PrivateModes & PrivMode_aplKP) ? !shft : shft) {
                        STRCPY(kbuf, "\033Oj");
                        kbuf[2] += (keysym - XK_KP_Multiply);
                    } else {
                        kbuf[0] = ('*' + (keysym - XK_KP_Multiply));
                        kbuf[1] = '\0';
                    }
                    break;

                case XK_Find:
                    STRCPY(kbuf, "\033[1~");
                    break;
                case XK_Insert:
                    STRCPY(kbuf, "\033[2~");
                    break;
#ifdef DXK_Remove               /* support for DEC remove like key */
                case DXK_Remove:
                /* FALLTHROUGH */
#endif
                case XK_Execute:
                    STRCPY(kbuf, "\033[3~");
                    break;
                case XK_Select:
                    STRCPY(kbuf, "\033[4~");
                    break;
#ifdef XK_KP_End
                case XK_KP_End:
                /* allow shift to override */
                    if ((R->h->PrivateModes & PrivMode_aplKP) ? !shft : shft) {
                        STRCPY(kbuf, "\033Oq");
                        break;
                    }
                /* FALLTHROUGH */
#endif
                case XK_End:
                    STRCPY(kbuf, KS_END);
                    break;
#ifdef XK_KP_Home
                case XK_KP_Home:
                /* allow shift to override */
                    if ((R->h->PrivateModes & PrivMode_aplKP) ? !shft : shft) {
                        STRCPY(kbuf, "\033Ow");
                        break;
                    }
                /* FALLTHROUGH */
#endif
                case XK_Home:
                    STRCPY(kbuf, KS_HOME);
                    break;

#define FKEY(n, fkey)                                                   \
    sprintf((char *)kbuf,"\033[%2d~", (int)((n) + (keysym - fkey)))

                case XK_F1:     /* "\033[11~" */
                case XK_F2:     /* "\033[12~" */
                case XK_F3:     /* "\033[13~" */
                case XK_F4:     /* "\033[14~" */
                case XK_F5:     /* "\033[15~" */
                    FKEY(11, XK_F1);
                    break;
                case XK_F6:     /* "\033[17~" */
                case XK_F7:     /* "\033[18~" */
                case XK_F8:     /* "\033[19~" */
                case XK_F9:     /* "\033[20~" */
                case XK_F10:    /* "\033[21~" */
                    FKEY(17, XK_F6);
                    break;
                case XK_F11:    /* "\033[23~" */
                case XK_F12:    /* "\033[24~" */
                case XK_F13:    /* "\033[25~" */
                case XK_F14:    /* "\033[26~" */
                    FKEY(23, XK_F11);
                    break;
                case XK_F15:    /* "\033[28~" */
                case XK_F16:    /* "\033[29~" */
                    FKEY(28, XK_F15);
                    break;
                case XK_Help:   /* "\033[28~" */
                    FKEY(28, XK_Help);
                    break;
                case XK_Menu:   /* "\033[29~" */
                    FKEY(29, XK_Menu);
                    break;
                case XK_F17:    /* "\033[31~" */
                case XK_F18:    /* "\033[32~" */
                case XK_F19:    /* "\033[33~" */
                case XK_F20:    /* "\033[34~" */
                case XK_F21:    /* "\033[35~" */
                case XK_F22:    /* "\033[36~" */
                case XK_F23:    /* "\033[37~" */
                case XK_F24:    /* "\033[38~" */
                case XK_F25:    /* "\033[39~" */
                case XK_F26:    /* "\033[40~" */
                case XK_F27:    /* "\033[41~" */
                case XK_F28:    /* "\033[42~" */
                case XK_F29:    /* "\033[43~" */
                case XK_F30:    /* "\033[44~" */
                case XK_F31:    /* "\033[45~" */
                case XK_F32:    /* "\033[46~" */
                case XK_F33:    /* "\033[47~" */
                case XK_F34:    /* "\033[48~" */
                case XK_F35:    /* "\033[49~" */
                    FKEY(31, XK_F17);
                    break;
#undef FKEY
                default:
                    newlen = 0;
                    break;
                }
                if (newlen)
                    len = STRLEN(kbuf);
            }
        /*
         * Pass meta for all function keys, if 'meta' option set
         */
#ifdef META8_OPTION
            if (meta && (R->h->meta_char == 0x80) && len > 0)
                kbuf[len - 1] |= 0x80;
#endif
        } else if (ctrl && keysym == XK_minus) {
            len = 1;
            kbuf[0] = '\037';   /* Ctrl-Minus generates ^_ (31) */
        } else {
#ifdef META8_OPTION
        /* set 8-bit on */
            if (meta && (R->h->meta_char == 0x80)) {
                unsigned char  *ch;

                for (ch = kbuf; ch < kbuf + len; ch++)
                    *ch |= 0x80;
                meta = 0;
            }
#endif
#ifdef GREEK_SUPPORT
            if (R->h->greek_mode)
                len = greek_xlat(kbuf, len);
#endif
        /* nil */ ;
        }
    }

    if (len <= 0)
        return;                 /* not mapped */

    if (R->Options & Opt_scrollTtyKeypress)
        if (R->TermWin.view_start) {
            R->TermWin.view_start = 0;
            R->h->want_refresh = 1;
        }

/*
 * these modifications only affect the static keybuffer
 * pass Shift/Control indicators for function keys ending with `~'
 *
 * eg,
 *   Prior = "ESC[5~"
 *   Shift+Prior = "ESC[5$"
 *   Ctrl+Prior = "ESC[5^"
 *   Ctrl+Shift+Prior = "ESC[5@"
 * Meta adds an Escape prefix (with META8_OPTION, if meta == <escape>).
 */
    if (kbuf[0] == C0_ESC && kbuf[1] == '[' && kbuf[len - 1] == '~')
        kbuf[len - 1] = (shft ? (ctrl ? '@' : '$') : (ctrl ? '^' : '~'));

/* escape prefix */
    if (meta
#ifdef META8_OPTION
        && (R->h->meta_char == C0_ESC)
#endif
        ) {
        const unsigned char ch = C0_ESC;

        rxvt_tt_write(aR_ &ch, 1);
    }
#ifdef DEBUG_CMD
    if (debug_key) {            /* Display keyboard buffer contents */
        char           *p;
        int             i;

        fprintf(stderr, "key 0x%04X [%d]: `", (unsigned int)keysym, len);
        for (i = 0, p = kbuf; i < len; i++, p++)
            fprintf(stderr, (*p >= ' ' && *p < '\177' ? "%c" : "\\%03o"), *p);
        fprintf(stderr, "'\n");
    }
#endif                          /* DEBUG_CMD */
    rxvt_tt_write(aR_ kbuf, (unsigned int)len);
}
/*}}} */

#if (MENUBAR_MAX)
/*{{{ rxvt_cmd_write(), rxvt_cmd_getc() */
/* attempt to `write' count to the input buffer */
/* EXTPROTO */
unsigned int
rxvt_cmd_write(pR_ const unsigned char *str, unsigned int count)
{
    unsigned int    n, s;
    unsigned char  *cmdbuf_base = R->h->cmdbuf_base,
                   *cmdbuf_endp = R->h->cmdbuf_endp,
                   *cmdbuf_ptr = R->h->cmdbuf_ptr;

    n = cmdbuf_ptr - cmdbuf_base;
    s = cmdbuf_base + BUFSIZ - 1 - cmdbuf_endp;
    if (n > 0 && s < count) {
        MEMMOVE(cmdbuf_base, cmdbuf_ptr,
                (unsigned int)(cmdbuf_endp - cmdbuf_ptr));
        cmdbuf_ptr = cmdbuf_base;
        cmdbuf_endp -= n;
        s += n;
    }
    if (count > s) {
        rxvt_print_error("data loss: cmd_write too large");
        count = s;
    }
    for (; count--;)
        *cmdbuf_endp++ = *str++;
    R->h->cmdbuf_ptr = cmdbuf_ptr;
    R->h->cmdbuf_endp = cmdbuf_endp;
    return 0;
}
#endif                          /* MENUBAR_MAX */

// read the next character, currently handles UTF-8
// will probably handle all sorts of other stuff in the future
static uint32_t
next_char (pR)
{
  rxvt_hidden *h = R->h;
  mbstate &s = h->mbstate;

  while (h->cmdbuf_ptr < h->cmdbuf_endp)
    {
      uint8_t ch = *h->cmdbuf_ptr;

      if (s.cnt)
        {
          if ((ch & 0xc0) == 0x80)
            {
              h->cmdbuf_ptr++;

              /* continuation */
              s.reg = (s.reg << 6) | (ch & 0x7f);

              if (--s.cnt == 0 && s.reg >= 128) /* if !inrange then corruption or hacking */
                return s.reg;

              continue;
            }
          else
            {
              s.cnt = 0;
              return s.orig; /* the _occasional_ non-utf-8 character may slip through... */
            }
        }
      
      if ((ch & 0xc0) == 0xc0)
        {
          h->cmdbuf_ptr++;

          /* first byte */
          s.orig = ch; /* for broken encodings */
          s.reg = ch;
          if ((ch & 0xe0) == 0xc0) { s.reg &= 0x1f; s.cnt = 1; }
          if ((ch & 0xf0) == 0xe0) { s.reg &= 0x0f; s.cnt = 2; }
          if ((ch & 0xf8) == 0xf0) { s.reg &= 0x07; s.cnt = 3; }
          if ((ch & 0xfc) == 0xf8) { s.reg &= 0x03; s.cnt = 4; }
          if ((ch & 0xfe) == 0xfc) { s.reg &= 0x01; s.cnt = 5; }
        }
      else
        {
          h->cmdbuf_ptr++; /* _occasional_ non-utf8 may slip through... */
          return ch;
        }
    }

  return NOCHAR;
}

/* rxvt_cmd_getc() - Return next input character */
/*
 * Return the next input character after first passing any keyboard input
 * to the command.
 */
/* INTPROTO */
uint32_t
rxvt_cmd_getc(pR)
{
#define TIMEOUT_USEC    5000
    fd_set          readfds;
    int             quick_timeout, select_res;
    int             want_motion_time, want_keypress_time;
    struct timeval  value;
#if defined(POINTER_BLANK) || defined(CURSOR_BLINK)
    struct timeval  tp;
#endif
    struct rxvt_hidden *h = R->h;

    uint32_t c = next_char (aR);
    if (c != NOCHAR)
      return c;

    for (;;) {
    /* loop until we can return something */

        if (h->v_bufstr < h->v_bufptr)  /* output any pending chars */
            rxvt_tt_write(aR_ NULL, 0);

#if defined(POINTER_BLANK) || defined(CURSOR_BLINK)
        tp.tv_sec = 0;          /* presume == 0 implies time not yet retrieved */
#endif
#if defined(CURSOR_BLINK)
        want_keypress_time = 0;
#endif
#if defined(POINTER_BLANK)
        want_motion_time = 0;
#endif

        while (XPending(R->Xdisplay)) { /* process pending X events */
            XEvent          xev;

            XNextEvent(R->Xdisplay, &xev);
#if defined(CURSOR_BLINK)
            if ((R->Options & Opt_cursorBlink)
                && xev.type == KeyPress) {
                if (h->hidden_cursor) {
                    h->hidden_cursor = 0;
                    h->want_refresh = 1;
                }
                want_keypress_time = 1;
            }
#endif
#if defined(POINTER_BLANK)
            if ((R->Options & Opt_pointerBlank)
                && (h->pointerBlankDelay > 0)) {
                if (xev.type == MotionNotify
                    || xev.type == ButtonPress
                    || xev.type == ButtonRelease) {
                    if (R->h->hidden_pointer)
                        rxvt_pointer_unblank(aR);
                    want_motion_time = 1;
                }
                if (xev.type == KeyPress && R->h->hidden_pointer == 0)
                    rxvt_pointer_blank(aR);
            }
#endif
#ifdef USE_XIM
            if (!XFilterEvent(&xev, xev.xany.window))
                rxvt_process_x_event(aR_ &xev);
            h->event_type = xev.type;
#else
            rxvt_process_x_event(aR_ &xev);
#endif
        /* in case button actions pushed chars to cmdbuf */
            if (h->cmdbuf_ptr < h->cmdbuf_endp)
                return *h->cmdbuf_ptr++;
        }

#if defined(CURSOR_BLINK)
        if (want_keypress_time) {
            (void)gettimeofday(&tp, NULL);
            h->lastcursorchange.tv_sec = tp.tv_sec;
            h->lastcursorchange.tv_usec = tp.tv_usec;
        }
#endif
#if defined(POINTER_BLANK)
        if (want_motion_time) {
            if (!tp.tv_sec)
                (void)gettimeofday(&tp, NULL);
            h->lastmotion.tv_sec = tp.tv_sec;
            h->lastmotion.tv_usec = tp.tv_usec;
        }
#endif

/*
 * the command input buffer is empty and we have no pending X events
 */
        quick_timeout = 0;

#if defined(MOUSE_WHEEL) && defined(MOUSE_SLIP_WHEELING)
        if (h->mouse_slip_wheel_speed) {
            quick_timeout = 1;
            if (!h->mouse_slip_wheel_delay--
                && rxvt_scr_page(aR_ h->mouse_slip_wheel_speed > 0 ? UP : DN,
                                 abs(h->mouse_slip_wheel_speed))) {
                h->mouse_slip_wheel_delay = SCROLLBAR_CONTINUOUS_DELAY;
                h->refresh_type |= SMOOTH_REFRESH;
                h->want_refresh = 1;
            }
        }
#endif /* MOUSE_WHEEL && MOUSE_SLIP_WHEELING */
#ifdef SELECTION_SCROLLING
        if (h->pending_scroll_selection) {
            quick_timeout = 1;
            if (!h->scroll_selection_delay--
                && rxvt_scr_page(aR_ h->scroll_selection_dir,
                    h->scroll_selection_lines)) {
                rxvt_selection_extend(aR_ h->selection_save_x,
                    h->selection_save_y, h->selection_save_state);
                h->scroll_selection_delay = SCROLLBAR_CONTINUOUS_DELAY;
                h->refresh_type |= SMOOTH_REFRESH;
                h->want_refresh = 1;
            }
        }
#endif
#ifndef NO_SCROLLBAR_BUTTON_CONTINUAL_SCROLLING
        if (scrollbar_isUp() || scrollbar_isDn()) {
            quick_timeout = 1;
            if (!h->scroll_arrow_delay--
                && rxvt_scr_page(aR_ scrollbar_isUp() ? UP : DN, 1)) {
                h->scroll_arrow_delay = SCROLLBAR_CONTINUOUS_DELAY;
                h->refresh_type |= SMOOTH_REFRESH;
                h->want_refresh = 1;
            }
        }
#endif                          /* NO_SCROLLBAR_BUTTON_CONTINUAL_SCROLLING */

        FD_ZERO(&readfds);
        FD_SET(R->cmd_fd, &readfds);
        FD_SET(R->Xfd, &readfds);
        value.tv_usec = TIMEOUT_USEC;
        value.tv_sec = 0;

        if (!R->TermWin.mapped)
            quick_timeout = 0;
        else {
            quick_timeout |= h->want_refresh;
#ifdef TRANSPARENT
            quick_timeout |= h->want_full_refresh;
#endif
        }

#if defined(POINTER_BLANK) || defined(CURSOR_BLINK)
        {
            int             set_quick_timeout = 0;
            long            csdiff, psdiff;

#define BLINK_TIME      500000L
            csdiff = psdiff = 60000000L;        /* or, say, LONG_MAX */
# if defined(CURSOR_BLINK)
            if (R->Options & Opt_cursorBlink) {
                if (!tp.tv_sec) /* didn't get it before so get it now */
                    (void)gettimeofday(&tp, NULL);

                csdiff = (tp.tv_sec - h->lastcursorchange.tv_sec) * 1000000L
                         + tp.tv_usec - h->lastcursorchange.tv_usec;
                if (csdiff > BLINK_TIME) { /* XXX: settable blink times */
                    h->lastcursorchange.tv_sec = tp.tv_sec;
                    h->lastcursorchange.tv_usec = tp.tv_usec;
                    h->hidden_cursor = !h->hidden_cursor;
                    csdiff = 0;
                } else
                    csdiff = BLINK_TIME - csdiff;
                set_quick_timeout = 1;
            }
# endif
# if defined(POINTER_BLANK)
        /*
         * If we haven't moved the pointer for a while
         */
            if ((R->Options & Opt_pointerBlank)
                && (h->pointerBlankDelay > 0)
                && (h->hidden_pointer == 0)) {
                long            pdelay;

                if (!tp.tv_sec) /* didn't get it before so get it now */
                    (void)gettimeofday(&tp, NULL);
                psdiff = (tp.tv_sec - h->lastmotion.tv_sec) * 1000000L
                         + tp.tv_usec - h->lastmotion.tv_usec;
                pdelay = h->pointerBlankDelay * 1000000L;
                if (psdiff >= pdelay)
                    rxvt_pointer_blank(aR);
                else {
                    set_quick_timeout = 1;
                    psdiff = pdelay - psdiff;
                }
            }
# endif
            if (!quick_timeout && set_quick_timeout) {
                MIN_IT(csdiff, psdiff);
                value.tv_sec =  csdiff / 1000000L;
                value.tv_usec = csdiff % 1000000L;
                quick_timeout = 1;
            }
        }
#endif

        if ((select_res = select(R->num_fds, &readfds, NULL, NULL,
                                 (quick_timeout ? &value : NULL))) == 0) {
        /* select statement timed out - we're not hard and fast scrolling */
            h->refresh_limit = 1;
        }
#if defined(CURSOR_BLINK)
        if (R->Options & Opt_cursorBlink)
            h->want_refresh = 1;
#endif

    /* See if we can read new data from the application */
        if (select_res > 0 && FD_ISSET(R->cmd_fd, &readfds)) {
            int             n;
            unsigned int    count;

            h->cmdbuf_ptr = h->cmdbuf_endp = h->cmdbuf_base;
            for (count = BUFSIZ; count; count -= n, h->cmdbuf_endp += n)
                if ((n = read(R->cmd_fd, h->cmdbuf_endp, count)) > 0)
                    continue;
                else if (n == 0 || (n < 0 && errno == EAGAIN))
                    break;
                else {
                    rxvt_clean_exit();
                    exit(EXIT_FAILURE); /* bad order of events? */
                }

            if (count != BUFSIZ)        /* some characters read in */
              {
                uint32_t c = next_char (aR);
                if (c != NOCHAR)
                  return c;
              }
        }
#ifdef TRANSPARENT
        if (h->want_full_refresh) {
            h->want_full_refresh = 0;
            rxvt_scr_clear(aR);
            rxvt_scr_touch(aR_ False);
            h->want_refresh = 1;
        }
#endif
        if (h->want_refresh) {
            rxvt_scr_refresh(aR_ h->refresh_type);
            rxvt_scrollbar_show(aR_ 1);
#ifdef USE_XIM
            rxvt_IMSendSpot(aR);
#endif
        }
    }
/* NOTREACHED */
}
/*}}} */

/* EXTPROTO */
void
rxvt_pointer_unblank(pR)
{
    XDefineCursor(R->Xdisplay, R->TermWin.vt, R->TermWin_cursor);
    rxvt_recolour_cursor(aR);
#ifdef POINTER_BLANK
    R->h->hidden_pointer = 0;
    if (R->h->pointerBlankDelay > 0) {
        struct timeval  tp;

        (void)gettimeofday(&tp, NULL);
        R->h->lastmotion.tv_sec = tp.tv_sec;
        R->h->lastmotion.tv_usec = tp.tv_usec;
    }
#endif
}

#ifdef POINTER_BLANK
/* INTPROTO */
void
rxvt_pointer_blank(pR)
{
    XDefineCursor(R->Xdisplay, R->TermWin.vt, R->h->pointer_blank);
    XFlush(R->Xdisplay);
    R->h->hidden_pointer = 1;
}
#endif

/* INTPROTO */
void
rxvt_mouse_report(pR_ const XButtonEvent *ev)
{
    int             button_number, key_state = 0;
    int             x, y;

    x = ev->x;
    y = ev->y;
    rxvt_pixel_position(aR_ &x, &y);

    if (R->h->MEvent.button == AnyButton) {
        button_number = 3;
    } else {
        button_number = R->h->MEvent.button - Button1;
        /* add 0x3D for wheel events, like xterm does */
        if (button_number >= 3)
            button_number += (64 - 3);
    }

    if (R->h->PrivateModes & PrivMode_MouseX10) {
    /*
     * do not report ButtonRelease
     * no state info allowed
     */
        key_state = 0;
        if (button_number == 3)
            return;
    } else {
    /* XTerm mouse reporting needs these values:
     *   4 = Shift
     *   8 = Meta
     *  16 = Control
     * plus will add in our own Double-Click reporting
     *  32 = Double Click
     */
        key_state = ((R->h->MEvent.state & ShiftMask) ? 4 : 0)
                     + ((R->h->MEvent.state & R->h->ModMetaMask) ? 8 : 0)
                     + ((R->h->MEvent.state & ControlMask) ? 16 : 0);
#ifdef MOUSE_REPORT_DOUBLECLICK
        key_state += ((R->h->MEvent.clicks > 1) ? 32 : 0);
#endif
    }

#ifdef DEBUG_MOUSEREPORT
    fprintf(stderr, "Mouse [");
    if (key_state & 16)
        fputc('C', stderr);
    if (key_state & 4)
        fputc('S', stderr);
    if (key_state & 8)
        fputc('A', stderr);
    if (key_state & 32)
        fputc('2', stderr);
    fprintf(stderr, "]: <%d>, %d/%d\n",
            button_number,
            x + 1,
            y + 1);
#else
    rxvt_tt_printf(aR_ "\033[M%c%c%c",
              (32 + button_number + key_state),
              (32 + x + 1),
              (32 + y + 1));
#endif
}

#ifdef USING_W11LIB
/* EXTPROTO */
void
rxvt_W11_process_x_event(XEvent *ev)
{
    rxvt_t         *r = rxvt_get_r();

    rxvt_process_x_event(aR_ ev);
}
#endif

/*{{{ process an X event */
/* INTPROTO */
void
rxvt_process_x_event(pR_ XEvent *ev)
{
    int             i, want_timeout;
    Window          unused_root, unused_child;
    int             unused_root_x, unused_root_y;
    unsigned int    unused_mask;
    struct timeval  tp;
    struct rxvt_hidden *h = R->h;
#ifdef DEBUG_X
    const char *const eventnames[] =
    {                           /* mason - this matches my system */
        "",
        "",
        "KeyPress",
        "KeyRelease",
        "ButtonPress",
        "ButtonRelease",
        "MotionNotify",
        "EnterNotify",
        "LeaveNotify",
        "FocusIn",
        "FocusOut",
        "KeymapNotify",
        "Expose",
        "GraphicsExpose",
        "NoExpose",
        "VisibilityNotify",
        "CreateNotify",
        "DestroyNotify",
        "UnmapNotify",
        "MapNotify",
        "MapRequest",
        "ReparentNotify",
        "ConfigureNotify",
        "ConfigureRequest",
        "GravityNotify",
        "ResizeRequest",
        "CirculateNotify",
        "CirculateRequest",
        "PropertyNotify",
        "SelectionClear",
        "SelectionRequest",
        "SelectionNotify",
        "ColormapNotify",
        "ClientMessage",
        "MappingNotify"
    };
    struct tm      *ltt;
#endif

    /*
     * check if we need to get the time for any timeouts
     */

    for (i = NUM_TIMEOUTS; i--; )
        if (h->timeout[i].tv_sec) {
            want_timeout = 1;
            break;
        }

#ifndef DEBUG_X
    if (want_timeout)
#endif
        (void)gettimeofday(&tp, NULL);

#ifdef DEBUG_X
    ltt = localtime(&(tp.tv_sec));
    D_X((stderr, "Event: %-16s %-7s %08lx (%4d-%02d-%02d %02d:%02d:%02d.%.6ld) %s %lu", eventnames[ev->type], (ev->xany.window == R->TermWin.parent[0] ? "parent" : (ev->xany.window == R->TermWin.vt ? "vt" : (ev->xany.window == R->scrollBar.win ? "scroll" : (ev->xany.window == R->menuBar.win ? "menubar" : "UNKNOWN")))), (ev->xany.window == R->TermWin.parent[0] ? R->TermWin.parent[0] : (ev->xany.window == R->TermWin.vt ? R->TermWin.vt : (ev->xany.window == R->scrollBar.win ? R->scrollBar.win : (ev->xany.window == R->menuBar.win ? R->menuBar.win : 0)))), ltt->tm_year + 1900, ltt->tm_mon + 1, ltt->tm_mday, ltt->tm_hour, ltt->tm_min, ltt->tm_sec, tp.tv_usec, ev->xany.send_event ? "S" : " ", ev->xany.serial));
#endif

    /* X event timeouts */
    if (want_timeout)
        for (i = NUM_TIMEOUTS; i--; ) {
            if (h->timeout[i].tv_sec == 0)
                continue;
            if ((tp.tv_sec < h->timeout[i].tv_sec)
                || (tp.tv_sec == h->timeout[i].tv_sec
                    && tp.tv_usec < h->timeout[i].tv_usec))
                continue;
            h->timeout[i].tv_sec = 0;
            switch(i) {
            case TIMEOUT_INCR:
                rxvt_print_error("data loss: timeout on INCR selection paste");
                h->selection_wait = Sel_none;
                break;
            default:
                break;
            }
        }

    switch (ev->type) {
    case KeyPress:
        rxvt_lookup_key(aR_ (XKeyEvent *)ev);
        break;

#if defined(MOUSE_WHEEL) && defined(MOUSE_SLIP_WHEELING)
    case KeyRelease:
        {
            if (!(ev->xkey.state & ControlMask))
                h->mouse_slip_wheel_speed = 0;
            else {
                KeySym          ks;
                
                ks = XKeycodeToKeysym(R->Xdisplay, ev->xkey.keycode, 0);
                if (ks == XK_Control_L || ks == XK_Control_R)
                    h->mouse_slip_wheel_speed = 0;
            }
            break;
        }
#endif

    case ButtonPress:
        rxvt_button_press(aR_ (XButtonEvent *)ev);
        break;

    case ButtonRelease:
        rxvt_button_release(aR_ (XButtonEvent *)ev);
        break;

    case ClientMessage:
        if (ev->xclient.format == 32
            && (Atom)ev->xclient.data.l[0] == h->xa[XA_WMDELETEWINDOW])
            exit(EXIT_SUCCESS);
#ifdef OFFIX_DND
    /* OffiX Dnd (drag 'n' drop) protocol */
        if (ev->xclient.message_type == h->xa[XA_DNDPROTOCOL]
            && (ev->xclient.data.l[0] == DndFile
                || ev->xclient.data.l[0] == DndDir
                || ev->xclient.data.l[0] == DndLink)) {
        /* Get Dnd data */
            Atom            ActualType;
            int             ActualFormat;
            unsigned char  *data;
            unsigned long   Size, RemainingBytes;

            XGetWindowProperty(R->Xdisplay, Xroot,
                               R->h->xa[XA_DNDSELECTION],
                               0L, 1000000L,
                               False, AnyPropertyType,
                               &ActualType, &ActualFormat,
                               &Size, &RemainingBytes,
                               &data);
            XChangeProperty(R->Xdisplay, Xroot,
                            XA_CUT_BUFFER0, XA_STRING,
                            8, PropModeReplace,
                            data, STRLEN(data));
            rxvt_selection_paste(aR_ Xroot, XA_CUT_BUFFER0, True);
            XSetInputFocus(R->Xdisplay, Xroot, RevertToNone, CurrentTime);
        }
#endif                          /* OFFIX_DND */
        break;

    case MappingNotify:
        XRefreshKeyboardMapping(&(ev->xmapping));
        break;

    /*
     * XXX: this is not the _current_ arrangement
     * Here's my conclusion:
     * If the window is completely unobscured, use bitblt's
     * to scroll. Even then, they're only used when doing partial
     * screen scrolling. When partially obscured, we have to fill
     * in the GraphicsExpose parts, which means that after each refresh,
     * we need to wait for the graphics expose or Noexpose events,
     * which ought to make things real slow!
     */
    case VisibilityNotify:
        switch (ev->xvisibility.state) {
        case VisibilityUnobscured:
            h->refresh_type = FAST_REFRESH;
            break;
        case VisibilityPartiallyObscured:
            h->refresh_type = SLOW_REFRESH;
            break;
        default:
            h->refresh_type = NO_REFRESH;
            break;
        }
        break;

    case FocusIn:
        if (!R->TermWin.focus) {
            R->TermWin.focus = 1;
            h->want_refresh = 1;
#ifdef USE_XIM
            if (h->Input_Context != NULL)
                XSetICFocus(h->Input_Context);
#endif
        }
        break;

    case FocusOut:
        if (R->TermWin.focus) {
            R->TermWin.focus = 0;
            h->want_refresh = 1;
#ifdef USE_XIM
            if (h->Input_Context != NULL)
                XUnsetICFocus(h->Input_Context);
#endif
        }
        break;

    case ConfigureNotify:
        if (ev->xconfigure.window == R->TermWin.parent[0]) {
            int             height, width;

            do {        /* Wrap lots of configures into one */
                width = ev->xconfigure.width;
                height = ev->xconfigure.height;
                D_SIZE((stderr, "Size: ConfigureNotify: %4d x %4d", width, height));
            } while (XCheckTypedWindowEvent(R->Xdisplay, ev->xconfigure.window,
                                            ConfigureNotify, ev));
            if (R->szHint.width != width || R->szHint.height != height) {
                D_SIZE((stderr, "Size: Resizing from: %4d x %4d", R->szHint.width, R->szHint.height));
                rxvt_resize_all_windows(aR_ (unsigned int)width,
                                        (unsigned int)height, 1);
            }
#ifdef DEBUG_SIZE
            else {
                D_SIZE((stderr, "Size: Not resizing"));
            }
#endif
#ifdef TRANSPARENT              /* XXX: maybe not needed - leave in for now */
            if (R->Options & Opt_transparent) {
                rxvt_check_our_parents(aR);
                if (h->am_transparent)
                    h->want_full_refresh = 1;
            }
#endif
        }
        break;

    case SelectionClear:
        rxvt_selection_clear(aR);
        break;

    case SelectionNotify:
        if (h->selection_wait == Sel_normal)
            rxvt_selection_paste(aR_ ev->xselection.requestor,
                                 ev->xselection.property, True);
        break;

    case SelectionRequest:
        rxvt_selection_send(aR_ &(ev->xselectionrequest));
        break;

    case UnmapNotify:
        R->TermWin.mapped = 0;
        break;

    case MapNotify:
        R->TermWin.mapped = 1;
        break;

    case PropertyNotify:
        if (ev->xproperty.atom == h->xa[XA_VT_SELECTION]) {
            if (ev->xproperty.state == PropertyNewValue)
                rxvt_selection_property(aR_ ev->xproperty.window,
                                        ev->xproperty.atom);
            break;
        }
#ifdef TRANSPARENT
    /*
     * if user used some Esetroot compatible prog to set the root bg,
     * use the property to determine the pixmap.  We use it later on.
     */
        if (h->xa[XA_XROOTPMAPID] == 0)
            h->xa[XA_XROOTPMAPID] = XInternAtom(R->Xdisplay,
                                               "_XROOTPMAP_ID", False);
        if (ev->xproperty.atom != h->xa[XA_XROOTPMAPID])
            break;
    /* FALLTHROUGH */
    case ReparentNotify:
        if ((R->Options & Opt_transparent) && rxvt_check_our_parents(aR)) {
            if (h->am_transparent)
                h->want_full_refresh = 1;
        }
#endif                          /* TRANSPARENT */
        break;

    case GraphicsExpose:
    case Expose:
        if (ev->xany.window == R->TermWin.vt) {
#ifdef NO_SLOW_LINK_SUPPORT
            rxvt_scr_expose(aR_ ev->xexpose.x, ev->xexpose.y,
                            ev->xexpose.width, ev->xexpose.height, False);
#else
            // don't understand this, so commented it out
            rxvt_scr_expose(aR_ ev->xexpose.x, ev->xexpose.y,
                            ev->xexpose.width, ev->xexpose.height, False);
            //rxvt_scr_expose(aR_ ev->xexpose.x, 0,
            //              ev->xexpose.width, R->TermWin.height, False);
#endif
            h->want_refresh = 1;
        } else {
            XEvent          unused_xevent;

            while (XCheckTypedWindowEvent(R->Xdisplay, ev->xany.window,
                                          Expose,
                                          &unused_xevent)) ;
            while (XCheckTypedWindowEvent(R->Xdisplay, ev->xany.window,
                                          GraphicsExpose,
                                          &unused_xevent)) ;
            if (isScrollbarWindow(ev->xany.window)) {
                scrollbar_setIdle();
                rxvt_scrollbar_show(aR_ 0);
            }
#ifdef MENUBAR
            if (menubar_visible(aR) && isMenuBarWindow(ev->xany.window))
                rxvt_menubar_expose(aR);
#endif
#ifdef RXVT_GRAPHICS
            rxvt_Gr_expose(aR_ ev->xany.window);
#endif
        }
        break;

    case MotionNotify:
#ifdef POINTER_BLANK
        if (R->h->hidden_pointer)
            rxvt_pointer_unblank(aR);
#endif
#if MENUBAR
        if (isMenuBarWindow(ev->xany.window)) {
            rxvt_menubar_control(aR_ &(ev->xbutton));
            break;
        }
#endif
        if ((h->PrivateModes & PrivMode_mouse_report) && !(h->bypass_keystate))
            break;

        if (ev->xany.window == R->TermWin.vt) {
            if ((ev->xbutton.state & (Button1Mask | Button3Mask))) {
                while (XCheckTypedWindowEvent(R->Xdisplay, R->TermWin.vt,
                                              MotionNotify, ev)) ;
                XQueryPointer(R->Xdisplay, R->TermWin.vt,
                              &unused_root, &unused_child,
                              &unused_root_x, &unused_root_y,
                              &(ev->xbutton.x), &(ev->xbutton.y),
                              &unused_mask);
#ifdef MOUSE_THRESHOLD
            /* deal with a `jumpy' mouse */
                if ((ev->xmotion.time - h->MEvent.time) > MOUSE_THRESHOLD) {
#endif
                    rxvt_selection_extend(aR_ (ev->xbutton.x), (ev->xbutton.y),
                                  (ev->xbutton.state & Button3Mask) ? 2 : 0);
#ifdef SELECTION_SCROLLING
                    if (ev->xbutton.y<R->TermWin.int_bwidth ||
                        Pixel2Row(ev->xbutton.y)>(R->TermWin.nrow-1)) {
                        int dist;
                        
                        h->pending_scroll_selection=1;
                        
                          /* don't clobber the current delay if we are
                           * already in the middle of scrolling.
                           */
                        if (h->scroll_selection_delay<=0)
                            h->scroll_selection_delay=SCROLLBAR_CONTINUOUS_DELAY;

                          /* save the event params so we can highlight
                           * the selection in the pending-scroll loop
                           */
                        h->selection_save_x=ev->xbutton.x;
                        h->selection_save_y=ev->xbutton.y;
                        h->selection_save_state=
                            (ev->xbutton.state & Button3Mask) ? 2 : 0;

                          /* calc number of lines to scroll */
                        if (ev->xbutton.y<R->TermWin.int_bwidth) {
                            h->scroll_selection_dir = UP;
                            dist = R->TermWin.int_bwidth - ev->xbutton.y;
                        }
                        else {
                            h->scroll_selection_dir = DN;
                            dist = ev->xbutton.y -
                                (R->TermWin.int_bwidth + R->TermWin.height);
                        }
                        h->scroll_selection_lines=(Pixel2Height(dist)/
                            SELECTION_SCROLL_LINE_SPEEDUP)+1;
                        MIN_IT(h->scroll_selection_lines,
                            SELECTION_SCROLL_MAX_LINES);
                    }
                    else {
                          /* we are within the text window, so we
                           * shouldn't be scrolling
                           */
                        h->pending_scroll_selection = 0;
                    }
#endif
#ifdef MOUSE_THRESHOLD
                }
#endif
            }
        } else if (isScrollbarWindow(ev->xany.window) && scrollbar_isMotion()) {
            while (XCheckTypedWindowEvent(R->Xdisplay, R->scrollBar.win,
                                          MotionNotify, ev)) ;
            XQueryPointer(R->Xdisplay, R->scrollBar.win,
                          &unused_root, &unused_child,
                          &unused_root_x, &unused_root_y,
                          &(ev->xbutton.x), &(ev->xbutton.y),
                          &unused_mask);
            rxvt_scr_move_to(aR_ scrollbar_position(ev->xbutton.y) - h->csrO,
                             scrollbar_size());
            rxvt_scr_refresh(aR_ h->refresh_type);
            h->refresh_limit = 0;
            rxvt_scrollbar_show(aR_ 1);
        }
        break;
    }
}

/* INTPROTO */
void
rxvt_button_press(pR_ XButtonEvent *ev)
{
    int             reportmode = 0, clickintime;
    struct rxvt_hidden *h = R->h;

    h->bypass_keystate = ev->state & (h->ModMetaMask | ShiftMask);
    if (!h->bypass_keystate)
        reportmode = !!(h->PrivateModes & PrivMode_mouse_report);
/*
 * VT window processing of button press
 */
    if (ev->window == R->TermWin.vt)
      {
#if RXVT_GRAPHICS
        if (ev->subwindow != None)
          rxvt_Gr_ButtonPress(ev->x, ev->y);
        else
#endif
          {
            clickintime = ev->time - h->MEvent.time < MULTICLICK_TIME;
            if (reportmode)
              {
                /* mouse report from vt window */
                /* save the xbutton state (for ButtonRelease) */
                h->MEvent.state = ev->state;
#ifdef MOUSE_REPORT_DOUBLECLICK
                if (ev->button == h->MEvent.button && clickintime)
                  {
                    /* same button, within alloted time */
                    h->MEvent.clicks++;
                    if (h->MEvent.clicks > 1)
                      {
                        /* only report double clicks */
                        h->MEvent.clicks = 2;
                        rxvt_mouse_report(aR_ ev);

                        /* don't report the release */
                        h->MEvent.clicks = 0;
                        h->MEvent.button = AnyButton;
                      }
                  }
                else
                  {
                    /* different button, or time expired */
                    h->MEvent.clicks = 1;
                    h->MEvent.button = ev->button;
                    rxvt_mouse_report(aR_ ev);
                  }
#else
                h->MEvent.button = ev->button;
                rxvt_mouse_report(aR_ ev);
#endif                          /* MOUSE_REPORT_DOUBLECLICK */
              }
            else
              {
                if (ev->button != h->MEvent.button)
                    h->MEvent.clicks = 0;
                switch (ev->button)
                  {
                    case Button1:
                        if (h->MEvent.button == Button1 && clickintime)
                          h->MEvent.clicks++;
                        else
                          h->MEvent.clicks = 1;
                        rxvt_selection_click(aR_ h->MEvent.clicks, ev->x, ev->y);
                        h->MEvent.button = Button1;
                        break;

                    case Button3:
                        if (h->MEvent.button == Button3 && clickintime)
                          rxvt_selection_rotate(aR_ ev->x, ev->y);
                        else
                          rxvt_selection_extend(aR_ ev->x, ev->y, 1);
                        h->MEvent.button = Button3;
                        break;
                  }
              }
            h->MEvent.time = ev->time;
            return;
          }
      }

/*
 * Scrollbar window processing of button press
 */
    if (isScrollbarWindow(ev->window))
      {
        scrollbar_setIdle();
        /*
         * Rxvt-style scrollbar:
         * move up if mouse is above slider
         * move dn if mouse is below slider
         *
         * XTerm-style scrollbar:
         * Move display proportional to pointer location
         * pointer near top -> scroll one line
         * pointer near bot -> scroll full page
         */
#ifndef NO_SCROLLBAR_REPORT
        if (reportmode) {
            /*
             * Mouse report disabled scrollbar:
             * arrow buttons - send up/down
             * click on scrollbar - send pageup/down
             */
            if ((R->scrollBar.style == R_SB_NEXT
                 && scrollbarnext_upButton(ev->y))
                || (R->scrollBar.style == R_SB_RXVT
                    && scrollbarrxvt_upButton(ev->y)))
                rxvt_tt_printf(aR_ "\033[A");
            else if ((R->scrollBar.style == R_SB_NEXT
                      && scrollbarnext_dnButton(ev->y))
                     || (R->scrollBar.style == R_SB_RXVT
                         && scrollbarrxvt_dnButton(ev->y)))
                rxvt_tt_printf(aR_ "\033[B");
            else
                switch (ev->button) {
                case Button2:
                    rxvt_tt_printf(aR_ "\014");
                    break;
                case Button1:
                    rxvt_tt_printf(aR_ "\033[6~");
                    break;
                case Button3:
                    rxvt_tt_printf(aR_ "\033[5~");
                    break;
                }
          }
        else
#endif                          /* NO_SCROLLBAR_REPORT */
          {
            char            upordown = 0;

            if (R->scrollBar.style == R_SB_NEXT) {
                if (scrollbarnext_upButton(ev->y))
                    upordown = -1;      /* up */
                else if (scrollbarnext_dnButton(ev->y))
                    upordown = 1;       /* down */
            } else if (R->scrollBar.style == R_SB_RXVT) {
                if (scrollbarrxvt_upButton(ev->y))
                    upordown = -1;      /* up */
                else if (scrollbarrxvt_dnButton(ev->y))
                    upordown = 1;       /* down */
            }
            if (upordown) { 
#ifndef NO_SCROLLBAR_BUTTON_CONTINUAL_SCROLLING
                h->scroll_arrow_delay = SCROLLBAR_INITIAL_DELAY;
#endif
                if (rxvt_scr_page(aR_ upordown < 0 ? UP : DN, 1)) {
                    if (upordown < 0)
                        scrollbar_setUp();
                    else
                        scrollbar_setDn();
                }
            } else
                switch (ev->button) {
                case Button2:
                    switch (h->scrollbar_align) {
                    case R_SB_ALIGN_TOP:
                        h->csrO = 0;
                        break;
                    case R_SB_ALIGN_CENTRE:
                        h->csrO = (R->scrollBar.bot - R->scrollBar.top) / 2;
                        break;
                    case R_SB_ALIGN_BOTTOM:
                        h->csrO = R->scrollBar.bot - R->scrollBar.top;
                        break;
                    }
                    if (R->scrollBar.style == R_SB_XTERM
                        || scrollbar_above_slider(ev->y)
                        || scrollbar_below_slider(ev->y))
                        rxvt_scr_move_to(aR_
                                         scrollbar_position(ev->y) - h->csrO,
                                         scrollbar_size());
                    scrollbar_setMotion();
                    break;

                case Button1:
                    if (h->scrollbar_align == R_SB_ALIGN_CENTRE)
                        h->csrO = ev->y - R->scrollBar.top;
                    /* FALLTHROUGH */

                case Button3:
                    if (R->scrollBar.style != R_SB_XTERM) {
                        if (scrollbar_above_slider(ev->y))
# ifdef RXVT_SCROLL_FULL
                            rxvt_scr_page(aR_ UP, R->TermWin.nrow - 1);
# else
                            rxvt_scr_page(aR_ UP, R->TermWin.nrow / 4);
# endif
                        else if (scrollbar_below_slider(ev->y))
# ifdef RXVT_SCROLL_FULL
                            rxvt_scr_page(aR_ DN, R->TermWin.nrow - 1);
# else
                            rxvt_scr_page(aR_ DN, R->TermWin.nrow / 4);
# endif
                        else
                            scrollbar_setMotion();
                    } else {
                        rxvt_scr_page(aR_ (ev->button == Button1 ? DN : UP),
                                      (R->TermWin.nrow
                                       * scrollbar_position(ev->y)
                                       / scrollbar_size()));
                    }
                    break;
                }
          }
        return;
    }
#if MENUBAR
    /*
     * Menubar window processing of button press
     */
    if (isMenuBarWindow(ev->window))
        rxvt_menubar_control(aR_ ev);
#endif
}

/* INTPROTO */
void
rxvt_button_release(pR_ XButtonEvent *ev)
{
    int             reportmode = 0;

    R->h->csrO = 0;             /* reset csr Offset */
    if (!R->h->bypass_keystate)
        reportmode = !!(R->h->PrivateModes & PrivMode_mouse_report);

    if (scrollbar_isUpDn()) {
        scrollbar_setIdle();
        rxvt_scrollbar_show(aR_ 0);
#ifndef NO_SCROLLBAR_BUTTON_CONTINUAL_SCROLLING
        R->h->refresh_type &= ~SMOOTH_REFRESH;
#endif
    }
#ifdef SELECTION_SCROLLING
    R->h->pending_scroll_selection=0;
#endif
    if (ev->window == R->TermWin.vt) 
      {
#ifdef RXVT_GRAPHICS
        if (ev->subwindow != None)
          rxvt_Gr_ButtonRelease(ev->x, ev->y);
        else 
#endif
          {
            if (reportmode) 
              {
                /* mouse report from vt window */
                /* don't report release of wheel "buttons" */
                if (ev->button >= 4)
                    return;
#ifdef MOUSE_REPORT_DOUBLECLICK
                /* only report the release of 'slow' single clicks */
                if (R->h->MEvent.button != AnyButton
                    && (ev->button != R->h->MEvent.button
                        || (ev->time - R->h->MEvent.time
                            > MULTICLICK_TIME / 2))) 
                  {
                    R->h->MEvent.clicks = 0;
                    R->h->MEvent.button = AnyButton;
                    rxvt_mouse_report(aR_ ev);
                  }
#else                           /* MOUSE_REPORT_DOUBLECLICK */
                R->h->MEvent.button = AnyButton;
                rxvt_mouse_report(aR_ ev);
#endif                          /* MOUSE_REPORT_DOUBLECLICK */
                return;
            }
            /*
             * dumb hack to compensate for the failure of click-and-drag
             * when overriding mouse reporting
             */
            if (R->h->PrivateModes & PrivMode_mouse_report
                && R->h->bypass_keystate
                && ev->button == Button1 && R->h->MEvent.clicks <= 1)
                rxvt_selection_extend(aR_ ev->x, ev->y, 0);

            switch (ev->button) {
            case Button1:
            case Button3:
                rxvt_selection_make(aR_ ev->time);
                break;
            case Button2:
                rxvt_selection_request(aR_ ev->time, ev->x, ev->y);
                break;
#ifdef MOUSE_WHEEL
            case Button4:
            case Button5:
                  {
                    int             i, v;

                    v = (ev->button == Button4) ? UP : DN;
                    if (ev->state & ShiftMask)
                        i = 1;
                    else if ((R->Options & Opt_mouseWheelScrollPage))
                        i = R->TermWin.nrow - 1;
                    else
                        i = 5;
# ifdef MOUSE_SLIP_WHEELING
                    if (ev->state & ControlMask) 
                      {
                        R->h->mouse_slip_wheel_speed += (v ? -1 : 1);
                        R->h->mouse_slip_wheel_delay = SCROLLBAR_CONTINUOUS_DELAY;
                      }
# endif
# ifdef JUMP_MOUSE_WHEEL
                    rxvt_scr_page(aR_ v, i);
                    rxvt_scr_refresh(aR_ SMOOTH_REFRESH);
                    rxvt_scrollbar_show(aR_ 1);
# else
                    for (; i--;)
                      {
                        rxvt_scr_page(aR_ v, 1);
                        rxvt_scr_refresh(aR_ SMOOTH_REFRESH);
                        rxvt_scrollbar_show(aR_ 1);
                      }
# endif
                  }
                break;
#endif
              }
          }
      }
#ifdef MENUBAR
    else if (isMenuBarWindow(ev->window))
        rxvt_menubar_control(aR_ ev);
#endif
}


#ifdef TRANSPARENT
/*
 * Check our parents are still who we think they are.
 * Do transparency updates if required
 */
/* EXTPROTO */
int
rxvt_check_our_parents(pR)
{
    int             i, pchanged, aformat, have_pixmap, rootdepth;
    unsigned long   nitems, bytes_after;
    Atom            atype;
    unsigned char   *prop = NULL;
    Window          root, oldp, *list;
    Pixmap          rootpixmap = None;
    XWindowAttributes wattr, wrootattr;

    pchanged = 0;

    if (!(R->Options & Opt_transparent))
        return pchanged;        /* Don't try any more */

    XGetWindowAttributes(R->Xdisplay, Xroot, &wrootattr);
    rootdepth = wrootattr.depth;

    XGetWindowAttributes(R->Xdisplay, R->TermWin.parent[0], &wattr);
    if (rootdepth != wattr.depth) {
        if (R->h->am_transparent) {
            pchanged = 1;
            XSetWindowBackground(R->Xdisplay, R->TermWin.vt,
                                 R->PixColors[Color_bg]);
            R->h->am_transparent = R->h->am_pixmap_trans = 0;
        }
        return pchanged;        /* Don't try any more */
    }

/* Get all X ops out of the queue so that our information is up-to-date. */
    XSync(R->Xdisplay, False);

/*
 * Make the frame window set by the window manager have
 * the root background. Some window managers put multiple nested frame
 * windows for each client, so we have to take care about that.
 */
    i = (R->h->xa[XA_XROOTPMAPID] != 0
         && (XGetWindowProperty(R->Xdisplay, Xroot, R->h->xa[XA_XROOTPMAPID],
                                0L, 1L, False, XA_PIXMAP, &atype, &aformat,
                                &nitems, &bytes_after, &prop) == Success));
    if (!i || prop == NULL)
        have_pixmap = 0;
    else {
        have_pixmap = 1;
        rootpixmap = *((Pixmap *)prop);
        XFree(prop);
    }
    if (have_pixmap) {
/*
 * Copy Xroot pixmap transparency
 */
        int             sx, sy, nx, ny;
        unsigned int    nw, nh;
        Window          cr;
        XImage         *image;
        GC              gc;
        XGCValues       gcvalue;

        XTranslateCoordinates(R->Xdisplay, R->TermWin.parent[0], Xroot,
                              0, 0, &sx, &sy, &cr);
        nw = (unsigned int)R->szHint.width;
        nh = (unsigned int)R->szHint.height;
        nx = ny = 0;
        if (sx < 0) {
            nw += sx;
            nx = -sx;
            sx = 0;
        }
        if (sy < 0) {
            nh += sy;
            ny = -sy;
            sy = 0;
        }
        MIN_IT(nw, (unsigned int)(wrootattr.width - sx));
        MIN_IT(nh, (unsigned int)(wrootattr.height - sy));
        R->h->allowedxerror = -1;
        image = XGetImage(R->Xdisplay, rootpixmap, sx, sy, nw, nh, AllPlanes,
                          ZPixmap);
        /* XXX: handle BadMatch - usually because we're outside the pixmap */
        /* XXX: may need a delay here? */
        R->h->allowedxerror = 0;
        if (image == NULL) {
            if (R->h->am_transparent && R->h->am_pixmap_trans) {
                pchanged = 1;
                if (R->TermWin.pixmap != None) {
                    XFreePixmap(R->Xdisplay, R->TermWin.pixmap);
                    R->TermWin.pixmap = None;
                }
            }
            R->h->am_pixmap_trans = 0;
        } else {
            if (R->TermWin.pixmap != None)
                XFreePixmap(R->Xdisplay, R->TermWin.pixmap);
            R->TermWin.pixmap = XCreatePixmap(R->Xdisplay, R->TermWin.vt,
                                              (unsigned int)R->szHint.width,
                                              (unsigned int)R->szHint.height,
                                              (unsigned int)image->depth);
            gc = XCreateGC(R->Xdisplay, R->TermWin.vt, 0UL, &gcvalue);
            XPutImage(R->Xdisplay, R->TermWin.pixmap, gc, image, 0, 0,
                      nx, ny, (unsigned int)image->width,
                      (unsigned int)image->height);
            XFreeGC(R->Xdisplay, gc);
            XDestroyImage(image);
            XSetWindowBackgroundPixmap(R->Xdisplay, R->TermWin.vt,
                                       R->TermWin.pixmap);
            if (!R->h->am_transparent || !R->h->am_pixmap_trans)
                pchanged = 1;
            R->h->am_transparent = R->h->am_pixmap_trans = 1;
        }
    }
    if (!R->h->am_pixmap_trans) {
        unsigned int    n;
/*
 * InheritPixmap transparency
 */
        D_X((stderr, "InheritPixmap Seeking to  %08lx", Xroot));
        for (i = 1; i < (int)(sizeof(R->TermWin.parent) / sizeof(Window));
             i++) {
            oldp = R->TermWin.parent[i];
            XQueryTree(R->Xdisplay, R->TermWin.parent[i - 1], &root,
                       &R->TermWin.parent[i], &list, &n);
            XFree(list);
            D_X((stderr, "InheritPixmap Parent[%d] = %08lx", i, R->TermWin.parent[i]));
            if (R->TermWin.parent[i] == Xroot) {
                if (oldp != None)
                    pchanged = 1;
                break;
            }
            if (oldp != R->TermWin.parent[i])
                pchanged = 1;
        }
        n = 0;
        if (pchanged) {
            for (; n < (unsigned int)i; n++) {
                XGetWindowAttributes(R->Xdisplay, R->TermWin.parent[n], &wattr);
                D_X((stderr, "InheritPixmap Checking Parent[%d]: %s", n, (wattr.depth == rootdepth && wattr.class != InputOnly) ? "OK" : "FAIL"));
                if (wattr.depth != rootdepth || wattr.class == InputOnly) {
                    n = (int)(sizeof(R->TermWin.parent) / sizeof(Window)) + 1;
                    break;
                }
            }
        }
        if (n > (int)(sizeof(R->TermWin.parent)
                      / sizeof(R->TermWin.parent[0]))) {
            D_X((stderr, "InheritPixmap Turning off"));
            XSetWindowBackground(R->Xdisplay, R->TermWin.parent[0],
                                 R->PixColors[Color_fg]);
            XSetWindowBackground(R->Xdisplay, R->TermWin.vt,
                                 R->PixColors[Color_bg]);
            R->h->am_transparent = 0;
            /* XXX: also turn off Opt_transparent? */
        } else {
            /* wait (an arbitrary period) for the WM to do its thing
             * needed for fvwm2.2.2 (and before?) */
# ifdef HAVE_NANOSLEEP
            struct timespec rqt;

            rqt.tv_sec = 1;
            rqt.tv_nsec = 0;
            nanosleep(&rqt, NULL);
# else
            sleep(1);   
# endif
            D_X((stderr, "InheritPixmap Turning on (%d parents)", i - 1));
            for (n = 0; n < (unsigned int)i; n++)
                XSetWindowBackgroundPixmap(R->Xdisplay, R->TermWin.parent[n],
                                           ParentRelative);
            XSetWindowBackgroundPixmap(R->Xdisplay, R->TermWin.vt,
                                       ParentRelative);
            R->h->am_transparent = 1;
        }
        for (; i < (int)(sizeof(R->TermWin.parent) / sizeof(Window)); i++)
            R->TermWin.parent[i] = None;
    }
    return pchanged;
}
#endif

/*}}} */

/*{{{ print pipe */
/*----------------------------------------------------------------------*/
#ifdef PRINTPIPE
/* EXTPROTO */
FILE           *
rxvt_popen_printer(pR)
{
    FILE           *stream = popen(R->h->rs[Rs_print_pipe], "w");

    if (stream == NULL)
        rxvt_print_error("can't open printer pipe");
    return stream;
}

/* EXTPROTO */
int
rxvt_pclose_printer(FILE *stream)
{
    fflush(stream);
/* pclose() reported not to work on SunOS 4.1.3 */
# if defined (__sun__)          /* TODO: RESOLVE THIS */
/* pclose works provided SIGCHLD handler uses waitpid */
    return pclose(stream);      /* return fclose (stream); */
# else
    return pclose(stream);
# endif
}

/*
 * simulate attached vt100 printer
 */
/* INTPROTO */
void
rxvt_process_print_pipe(pR)
{
    int             done;
    FILE           *fd;

    if ((fd = rxvt_popen_printer(aR)) == NULL)
        return;

/*
 * Send all input to the printer until either ESC[4i or ESC[?4i
 * is received.
 */
    for (done = 0; !done;) {
        unsigned char   buf[8];
        unsigned char   ch;
        unsigned int    i, len;

        if ((ch = rxvt_cmd_getc(aR)) != C0_ESC) {
            if (putc(ch, fd) == EOF)
                break;          /* done = 1 */
        } else {
            len = 0;
            buf[len++] = ch;

            if ((buf[len++] = rxvt_cmd_getc(aR)) == '[') {
                if ((ch = rxvt_cmd_getc(aR)) == '?') {
                    buf[len++] = '?';
                    ch = rxvt_cmd_getc(aR);
                }
                if ((buf[len++] = ch) == '4') {
                    if ((buf[len++] = rxvt_cmd_getc(aR)) == 'i')
                        break;  /* done = 1 */
                }
            }
            for (i = 0; i < len; i++)
                if (putc(buf[i], fd) == EOF) {
                    done = 1;
                    break;
                }
        }
    }
    rxvt_pclose_printer(fd);
}
#endif                          /* PRINTPIPE */
/*}}} */

/* *INDENT-OFF* */
enum {
    C1_40 = 0x40,
            C1_41 , C1_BPH, C1_NBH, C1_44 , C1_NEL, C1_SSA, C1_ESA,
    C1_HTS, C1_HTJ, C1_VTS, C1_PLD, C1_PLU, C1_RI , C1_SS2, C1_SS3,
    C1_DCS, C1_PU1, C1_PU2, C1_STS, C1_CCH, C1_MW , C1_SPA, C1_EPA,
    C1_SOS, C1_59 , C1_SCI, C1_CSI, CS_ST , C1_OSC, C1_PM , C1_APC
};
/* *INDENT-ON* */

/*{{{ process non-printing single characters */
/* INTPROTO */
void
rxvt_process_nonprinting(pR_ unsigned char ch)
{
    switch (ch) {
    case C0_ENQ:        /* terminal Status */
        if (R->h->rs[Rs_answerbackstring])
            rxvt_tt_write(aR_
                (const unsigned char *)R->h->rs[Rs_answerbackstring],
                (unsigned int)STRLEN(R->h->rs[Rs_answerbackstring]));
        else
            rxvt_tt_write(aR_ (unsigned char *)VT100_ANS,
                          (unsigned int)STRLEN(VT100_ANS));
        break;
    case C0_BEL:        /* bell */
        rxvt_scr_bell(aR);
        break;
    case C0_BS:         /* backspace */
        rxvt_scr_backspace(aR);
        break;
    case C0_HT:         /* tab */
        rxvt_scr_tab(aR_ 1);
        break;
    case C0_CR:         /* carriage return */
        rxvt_scr_gotorc(aR_ 0, 0, R_RELATIVE);
        break;
    case C0_VT:         /* vertical tab, form feed */
    case C0_FF:
    case C0_LF:         /* line feed */
        rxvt_scr_index(aR_ UP);
        break;
    case C0_SO:         /* shift out - acs */
        rxvt_scr_charset_choose(aR_ 1);
        break;
    case C0_SI:         /* shift in - acs */
        rxvt_scr_charset_choose(aR_ 0);
        break;
    }
}
/*}}} */


/*{{{ process VT52 escape sequences */
/* INTPROTO */
void
rxvt_process_escape_vt52(pR_ unsigned char ch)
{
    int row, col;
    
    switch (ch) {
    case 'A':           /* cursor up */
        rxvt_scr_gotorc(aR_ -1, 0, R_RELATIVE | C_RELATIVE);    
        break;
    case 'B':           /* cursor down */
        rxvt_scr_gotorc(aR_ 1, 0, R_RELATIVE | C_RELATIVE);     
        break;
    case 'C':           /* cursor right */
        rxvt_scr_gotorc(aR_ 0, 1, R_RELATIVE | C_RELATIVE);     
        break;
    case 'D':           /* cursor left */
        rxvt_scr_gotorc(aR_ 0, -1, R_RELATIVE | C_RELATIVE);    
        break;
    case 'H':           /* cursor home */
        rxvt_scr_gotorc(aR_ 0, 0, 0);   
        break;
    case 'I':           /* cursor up and scroll down if needed */
        rxvt_scr_index(aR_ DN);
        break;
    case 'J':           /* erase to end of screen */
        rxvt_scr_erase_screen(aR_ 0);
        break;
    case 'K':           /* erase to end of line */
        rxvt_scr_erase_line(aR_ 0);
        break;
    case 'Y':           /* move to specified row and col */
          /* full command is 'ESC Y row col' where row and col
           * are encoded by adding 32 and sending the ascii
           * character.  eg. SPACE = 0, '+' = 13, '0' = 18,
           * etc. */
        row = rxvt_cmd_getc(aR) - ' ';
        col = rxvt_cmd_getc(aR) - ' ';
        rxvt_scr_gotorc(aR_ row, col, 0);
        break;
    case 'Z':           /* identify the terminal type */
        rxvt_tt_printf(aR_ "\033/Z");   /* I am a VT100 emulating a VT52 */
        break;
    case '<':           /* turn off VT52 mode */
        PrivMode(0, PrivMode_vt52);
        break;
    case 'F':           /* use special graphics character set */
    case 'G':           /* use regular character set */
          /* unimplemented */
        break;
    case '=':           /* use alternate keypad mode */
    case '>':           /* use regular keypad mode */
          /* unimplemented */
        break;
    }
}
/*}}} */


/*{{{ process escape sequences */
/* INTPROTO */
void
rxvt_process_escape_seq(pR)
{
    unsigned char   ch = rxvt_cmd_getc(aR);

    if (R->h->PrivateModes & PrivMode_vt52) {
        rxvt_process_escape_vt52(aR_ ch);
        return;
    }
    
    switch (ch) {
    /* case 1:        do_tek_mode (); break; */
    case '#':
        if (rxvt_cmd_getc(aR) == '8')
            rxvt_scr_E(aR);
        break;
    case '(':
        rxvt_scr_charset_set(aR_ 0, (unsigned int)rxvt_cmd_getc(aR));
        break;
    case ')':
        rxvt_scr_charset_set(aR_ 1, (unsigned int)rxvt_cmd_getc(aR));
        break;
    case '*':
        rxvt_scr_charset_set(aR_ 2, (unsigned int)rxvt_cmd_getc(aR));
        break;
    case '+':
        rxvt_scr_charset_set(aR_ 3, (unsigned int)rxvt_cmd_getc(aR));
        break;
#ifdef MULTICHAR_SET
    case '$':
        rxvt_scr_charset_set(aR_ -2, (unsigned int)rxvt_cmd_getc(aR));
        break;
#endif
#ifndef NO_FRILLS
    case '6':
        rxvt_scr_backindex(aR);
        break;
#endif
    case '7':
        rxvt_scr_cursor(aR_ SAVE);
        break;
    case '8':
        rxvt_scr_cursor(aR_ RESTORE);
        break;
#ifndef NO_FRILLS
    case '9':
        rxvt_scr_forwardindex(aR);
        break;
#endif
    case '=':
    case '>':
        PrivMode((ch == '='), PrivMode_aplKP);
        break;

    case C1_40:
        rxvt_cmd_getc(aR);
        break;
    case C1_44:
        rxvt_scr_index(aR_ UP);
        break;

    /* 8.3.87: NEXT LINE */
    case C1_NEL:                /* ESC E */
        {
          uint32_t nlcr[] = { '\n', '\r' };
          rxvt_scr_add_lines(aR_ nlcr, 1, 2);
        }
        break;

    /* kidnapped escape sequence: Should be 8.3.48 */
    case C1_ESA:                /* ESC G */
        rxvt_process_graphics(aR);
        break;

    /* 8.3.63: CHARACTER TABULATION SET */
    case C1_HTS:                /* ESC H */
        rxvt_scr_set_tab(aR_ 1);
        break;

    /* 8.3.105: REVERSE LINE FEED */
    case C1_RI:                 /* ESC M */
        rxvt_scr_index(aR_ DN);
        break;

    /* 8.3.142: SINGLE-SHIFT TWO */
    /*case C1_SS2: scr_single_shift (2);   break; */

    /* 8.3.143: SINGLE-SHIFT THREE */
    /*case C1_SS3: scr_single_shift (3);   break; */

    /* 8.3.27: DEVICE CONTROL STRING */
    case C1_DCS:                /* ESC P */
        rxvt_process_dcs_seq(aR);
        break;

    /* 8.3.110: SINGLE CHARACTER INTRODUCER */
    case C1_SCI:                /* ESC Z */
        rxvt_tt_write(aR_ (const unsigned char *)ESCZ_ANSWER,
                      (unsigned int)(sizeof(ESCZ_ANSWER) - 1));
        break;                  /* steal obsolete ESC [ c */

    /* 8.3.16: CONTROL SEQUENCE INTRODUCER */
    case C1_CSI:                /* ESC [ */
        rxvt_process_csi_seq(aR);
        break;

    /* 8.3.90: OPERATING SYSTEM COMMAND */
    case C1_OSC:                /* ESC ] */
        rxvt_process_osc_seq(aR);
        break;

    /* 8.3.106: RESET TO INITIAL STATE */
    case 'c':
        rxvt_scr_poweron(aR);
        rxvt_scrollbar_show(aR_ 1);
        break;

    /* 8.3.79: LOCKING-SHIFT TWO (see ISO2022) */
    case 'n':
        rxvt_scr_charset_choose(aR_ 2);
        break;

    /* 8.3.81: LOCKING-SHIFT THREE (see ISO2022) */
    case 'o':
        rxvt_scr_charset_choose(aR_ 3);
        break;
    }
}
/*}}} */

/*{{{ process CONTROL SEQUENCE INTRODUCER (CSI) sequences `ESC[' */
/* *INDENT-OFF* */
enum {
    CSI_ICH = 0x40,
             CSI_CUU, CSI_CUD, CSI_CUF, CSI_CUB, CSI_CNL, CSI_CPL, CSI_CHA,
    CSI_CUP, CSI_CHT, CSI_ED , CSI_EL , CSI_IL , CSI_DL , CSI_EF , CSI_EA ,
    CSI_DCH, CSI_SEE, CSI_CPR, CSI_SU , CSI_SD , CSI_NP , CSI_PP , CSI_CTC,
    CSI_ECH, CSI_CVT, CSI_CBT, CSI_SRS, CSI_PTX, CSI_SDS, CSI_SIMD, CSI_5F,
    CSI_HPA, CSI_HPR, CSI_REP, CSI_DA , CSI_VPA, CSI_VPR, CSI_HVP, CSI_TBC,
    CSI_SM , CSI_MC , CSI_HPB, CSI_VPB, CSI_RM , CSI_SGR, CSI_DSR, CSI_DAQ,
    CSI_70 , CSI_71 , CSI_72 , CSI_73 , CSI_74 , CSI_75 , CSI_76 , CSI_77 ,
    CSI_78 , CSI_79 , CSI_7A , CSI_7B , CSI_7C , CSI_7D , CSI_7E , CSI_7F 
};

#define make_byte(b7,b6,b5,b4,b3,b2,b1,b0)                      \
    (((b7) << 7) | ((b6) << 6) | ((b5) << 5) | ((b4) << 4)      \
     | ((b3) << 3) | ((b2) << 2) | ((b1) << 1) | (b0))
#define get_byte_array_bit(array, bit)                          \
    (!!((array)[(bit) / 8] & (128 >> ((bit) & 7))))

const unsigned char csi_defaults[] = {
    make_byte(1,1,1,1,1,1,1,1), /* @, A, B, C, D, E, F, G, */
    make_byte(1,1,0,0,1,1,0,0), /* H, I, J, K, L, M, N, O, */
    make_byte(1,0,1,1,1,1,1,0), /* P, Q, R, S, T, U, V, W, */
    make_byte(1,1,1,0,0,0,1,0), /* X, Y, Z, [, \, ], ^, _, */
    make_byte(1,1,1,0,1,1,1,0), /* `, a, b, c, d, e, f, g, */
    make_byte(0,0,1,1,0,0,0,0), /* h, i, j, k, l, m, n, o, */
    make_byte(0,0,0,0,0,0,0,0), /* p, q, r, s, t, u, v, w, */
    make_byte(0,0,0,0,0,0,0,0)  /* x, y, z, {, |, }, ~,    */
};
/* *INDENT-ON* */

/* INTPROTO */
void
rxvt_process_csi_seq(pR)
{
    unsigned char   ch, priv, i;
    unsigned int    nargs, p;
    int             n, ndef;
    int             arg[ESC_ARGS];

    for (nargs = ESC_ARGS; nargs > 0;)
        arg[--nargs] = 0;

    priv = 0;
    ch = rxvt_cmd_getc(aR);
    if (ch >= '<' && ch <= '?') {       /* '<' '=' '>' '?' */
        priv = ch;
        ch = rxvt_cmd_getc(aR);
    }
/* read any numerical arguments */
    for (n = -1; ch < CSI_ICH; ) {
        if (isdigit(ch)) {
            if (n < 0)
                n = ch - '0';
            else
                n = n * 10 + ch - '0';
        } else if (ch == ';') {
            if (nargs < ESC_ARGS)
                arg[nargs++] = n;
            n = -1;
        } else if (ch == '\b') {
            rxvt_scr_backspace(aR);
        } else if (ch == C0_ESC) {
            rxvt_process_escape_seq(aR);
            return;
        } else if (ch < ' ') {
            rxvt_process_nonprinting(aR_ ch);
        }
        ch = rxvt_cmd_getc(aR);
    }

    if (ch > CSI_7F)
        return;

    if (nargs < ESC_ARGS)
        arg[nargs++] = n;

    i = ch - CSI_ICH;
    ndef = get_byte_array_bit(csi_defaults, i);
    for (p = 0; p < nargs; p++)
        if (arg[p] == -1)
            arg[p] = ndef;

#ifdef DEBUG_CMD
    fprintf(stderr, "CSI ");
    for (p = 0; p < nargs; p++)
        fprintf(stderr, "%d%s", arg[p], p < nargs - 1 ? ";" : "");
    fprintf(stderr, "%c\n", ch);
#endif

/*
 * private mode handling
 */
    if (priv) {
        switch (priv) {
        case '>':
            if (ch == CSI_DA)   /* secondary device attributes */
                rxvt_tt_printf(aR_ "\033[>%d;%-.8s;0c", 'R', VSTRING);
            break;
        case '?':
            if (ch == 'h' || ch == 'l' || ch == 'r' || ch == 's' || ch == 't')
                rxvt_process_terminal_mode(aR_ ch, priv, nargs, arg);
            break;
        }
        return;
    }

    switch (ch) {
/*
 * ISO/IEC 6429:1992(E) CSI sequences (defaults in parentheses)
 */
#ifdef PRINTPIPE
    case CSI_MC:                /* 8.3.83: (0) MEDIA COPY */
        switch (arg[0]) {
        case 0:                 /* initiate transfer to primary aux device */
            rxvt_scr_printscreen(aR_ 0);
            break;
        case 5:                 /* start relay to primary aux device */
            rxvt_process_print_pipe(aR);
            break;
        }
        break;
#endif

    case CSI_CUU:               /* 8.3.22: (1) CURSOR UP */
    case CSI_VPR:               /* 8.3.161: (1) LINE POSITION FORWARD */
        arg[0] = -arg[0];
    /* FALLTHROUGH */
    case CSI_CUD:               /* 8.3.19: (1) CURSOR DOWN */
    case CSI_VPB:               /* 8.3.160: (1) LINE POSITION BACKWARD */
        rxvt_scr_gotorc(aR_ arg[0], 0, RELATIVE);
        break;

    case CSI_CUB:               /* 8.3.18: (1) CURSOR LEFT */
    case CSI_HPB:               /* 8.3.59: (1) CHARACTER POSITION BACKWARD */
#ifdef ISO6429
        arg[0] = -arg[0];
#else                           /* emulate common DEC VTs */
        arg[0] = arg[0] ? -arg[0] : -1;
#endif
    /* FALLTHROUGH */
    case CSI_CUF:               /* 8.3.20: (1) CURSOR RIGHT */
    case CSI_HPR:               /* 8.3.60: (1) CHARACTER POSITION FORWARD */
#ifdef ISO6429
        rxvt_scr_gotorc(aR_ 0, arg[0], RELATIVE);
#else                           /* emulate common DEC VTs */
        rxvt_scr_gotorc(aR_ 0, arg[0] ? arg[0] : 1, RELATIVE);
#endif
        break;

    case CSI_CPL:               /* 8.3.13: (1) CURSOR PRECEDING LINE */
        arg[0] = -arg[0];
    /* FALLTHROUGH */
    case CSI_CNL:               /* 8.3.12: (1) CURSOR NEXT LINE */
        rxvt_scr_gotorc(aR_ arg[0], 0, R_RELATIVE);
        break;

    case CSI_CHA:               /* 8.3.9: (1) CURSOR CHARACTER ABSOLUTE */
    case CSI_HPA:               /* 8.3.58: (1) CURSOR POSITION ABSOLUTE */
        rxvt_scr_gotorc(aR_ 0, arg[0] - 1, R_RELATIVE);
        break;

    case CSI_VPA:               /* 8.3.159: (1) LINE POSITION ABSOLUTE */
        rxvt_scr_gotorc(aR_ arg[0] - 1, 0, C_RELATIVE);
        break;

    case CSI_CUP:               /* 8.3.21: (1,1) CURSOR POSITION */
    case CSI_HVP:               /* 8.3.64: (1,1) CHARACTER AND LINE POSITION */
        rxvt_scr_gotorc(aR_ arg[0] - 1, nargs < 2 ? 0 : (arg[1] - 1), 0);
        break;

    case CSI_CBT:               /* 8.3.7: (1) CURSOR BACKWARD TABULATION */
        arg[0] = -arg[0];
    /* FALLTHROUGH */
    case CSI_CHT:               /* 8.3.10: (1) CURSOR FORWARD TABULATION */
        rxvt_scr_tab(aR_ arg[0]);
        break;

    case CSI_ED:                /* 8.3.40: (0) ERASE IN PAGE */
        rxvt_scr_erase_screen(aR_ arg[0]);
        break;

    case CSI_EL:                /* 8.3.42: (0) ERASE IN LINE */
        rxvt_scr_erase_line(aR_ arg[0]);
        break;

    case CSI_ICH:               /* 8.3.65: (1) INSERT CHARACTER */
        rxvt_scr_insdel_chars(aR_ arg[0], INSERT);
        break;

    case CSI_IL:                /* 8.3.68: (1) INSERT LINE */
        rxvt_scr_insdel_lines(aR_ arg[0], INSERT);
        break;

    case CSI_DL:                /* 8.3.33: (1) DELETE LINE */
        rxvt_scr_insdel_lines(aR_ arg[0], DELETE);
        break;

    case CSI_ECH:               /* 8.3.39: (1) ERASE CHARACTER */
        rxvt_scr_insdel_chars(aR_ arg[0], ERASE);
        break;

    case CSI_DCH:               /* 8.3.26: (1) DELETE CHARACTER */
        rxvt_scr_insdel_chars(aR_ arg[0], DELETE);
        break;

    case CSI_SD:                /* 8.3.114: (1) SCROLL DOWN */
        arg[0] = -arg[0];
    /* FALLTHROUGH */
    case CSI_SU:                /* 8.3.148: (1) SCROLL UP */
        rxvt_scroll_text(aR_ R->screen.tscroll, R->screen.bscroll, arg[0], 0);
        break;

    case CSI_DA:                /* 8.3.24: (0) DEVICE ATTRIBUTES */
        rxvt_tt_write(aR_ (const unsigned char *)VT100_ANS,
                      (unsigned int)(sizeof(VT100_ANS) - 1));
        break;

    case CSI_SGR:               /* 8.3.118: (0) SELECT GRAPHIC RENDITION */
        rxvt_process_sgr_mode(aR_ nargs, arg);
        break;

    case CSI_DSR:               /* 8.3.36: (0) DEVICE STATUS REPORT */
        switch (arg[0]) {
        case 5:                 /* DSR requested */
            rxvt_tt_printf(aR_ "\033[0n");
            break;
        case 6:                 /* CPR requested */
            rxvt_scr_report_position(aR);
            break;
#if defined (ENABLE_DISPLAY_ANSWER)
        case 7:                 /* unofficial extension */
            rxvt_tt_printf(aR_ "%-.250s\n", R->h->rs[Rs_display_name]);
            break;
#endif
        case 8:                 /* unofficial extension */
            rxvt_xterm_seq(aR_ XTerm_title, APL_NAME "-" VERSION, CHAR_ST);
            break;
        }
        break;

    case CSI_TBC:               /* 8.3.155: (0) TABULATION CLEAR */
        switch (arg[0]) {
        case 0:                 /* char tab stop cleared at active position */
            rxvt_scr_set_tab(aR_ 0);
            break;
        /* case 1: */           /* line tab stop cleared in active line */
        /* case 2: */           /* char tab stops cleared in active line */
        case 3:                 /* all char tab stops are cleared */
        /* case 4: */           /* all line tab stops are cleared */
        case 5:                 /* all tab stops are cleared */
            rxvt_scr_set_tab(aR_ -1);
            break;
        }
        break;

    case CSI_CTC:               /* 8.3.17: (0) CURSOR TABULATION CONTROL */
        switch (arg[0]) {
        case 0:                 /* char tab stop set at active position */
            rxvt_scr_set_tab(aR_ 1);
            break;              /* = ESC H */
        /* case 1: */           /* line tab stop set at active line */
        case 2:                 /* char tab stop cleared at active position */
            rxvt_scr_set_tab(aR_ 0);
            break;              /* = ESC [ 0 g */
        /* case 3: */           /* line tab stop cleared at active line */
        /* case 4: */           /* char tab stops cleared at active line */
        case 5:                 /* all char tab stops are cleared */
            rxvt_scr_set_tab(aR_ -1);
            break;              /* = ESC [ 3 g */
        /* case 6: */           /* all line tab stops are cleared */
        }
        break;

    case CSI_RM:                /* 8.3.107: RESET MODE */
        if (arg[0] == 4)
            rxvt_scr_insert_mode(aR_ 0);
        break;

    case CSI_SM:                /* 8.3.126: SET MODE */
        if (arg[0] == 4)
            rxvt_scr_insert_mode(aR_ 1);
        break;

/*
 * PRIVATE USE beyond this point.  All CSI_7? sequences here
 */ 
    case CSI_72:                /* DECSTBM: set top and bottom margins */
        if (nargs == 1)
            rxvt_scr_scroll_region(aR_ arg[0] - 1, MAX_ROWS - 1);
        else if (nargs == 0 || arg[0] >= arg[1])
            rxvt_scr_scroll_region(aR_ 0, MAX_ROWS - 1);
        else 
            rxvt_scr_scroll_region(aR_ arg[0] - 1, arg[1] - 1);
        break;

    case CSI_73:
        rxvt_scr_cursor(aR_ SAVE);
        break;
    case CSI_75:
        rxvt_scr_cursor(aR_ RESTORE);
        break;

#ifndef NO_FRILLS
    case CSI_74:
        rxvt_process_window_ops(aR_ arg, nargs);
        break;
#endif

    case CSI_78:                /* DECREQTPARM */
        if (arg[0] == 0 || arg[0] == 1)
            rxvt_tt_printf(aR_ "\033[%d;1;1;112;112;1;0x", arg[0] + 2);
    /* FALLTHROUGH */

    default:
        break;
    }
}
/*}}} */

#ifndef NO_FRILLS
/* ARGSUSED */
/* INTPROTO */
void
rxvt_process_window_ops(pR_ const int *args, unsigned int nargs)
{
    int             x, y;
#if 0
    char           *s;
#endif
    XWindowAttributes wattr;
    Window          wdummy;

    if (nargs == 0)
        return;
    switch (args[0]) {
    /*
     * commands
     */
    case 1:                     /* deiconify window */
        XMapWindow(R->Xdisplay, R->TermWin.parent[0]);
        break;
    case 2:                     /* iconify window */
        XIconifyWindow(R->Xdisplay, R->TermWin.parent[0],
                       DefaultScreen(R->Xdisplay));
        break;
    case 3:                     /* set position (pixels) */
        XMoveWindow(R->Xdisplay, R->TermWin.parent[0], args[1], args[2]);
        break;
    case 4:                     /* set size (pixels) */
        rxvt_set_widthheight(aR_ (unsigned int)args[2], (unsigned int)args[1]);
        break;
    case 5:                     /* raise window */
        XRaiseWindow(R->Xdisplay, R->TermWin.parent[0]);
        break;
    case 6:                     /* lower window */
        XLowerWindow(R->Xdisplay, R->TermWin.parent[0]);
        break;
    case 7:                     /* refresh window */
        rxvt_scr_touch(aR_ True);
        break;
    case 8:                     /* set size (chars) */
        rxvt_set_widthheight(aR_ (unsigned int)(args[2] * R->TermWin.fwidth),
                             (unsigned int)(args[1] * R->TermWin.fheight));
        break;
    default:
        if (args[0] >= 24)      /* set height (chars) */
            rxvt_set_widthheight(aR_ (unsigned int)R->TermWin.width,
                                 (unsigned int)(args[1] * R->TermWin.fheight));
        break;
    /*
     * reports - some output format copied from XTerm
     */
    case 11:                    /* report window state */
        XGetWindowAttributes(R->Xdisplay, R->TermWin.parent[0], &wattr);
        rxvt_tt_printf(aR_ "\033[%dt", wattr.map_state == IsViewable ? 1 : 2);
        break;
    case 13:                    /* report window position */
        XGetWindowAttributes(R->Xdisplay, R->TermWin.parent[0], &wattr);
        XTranslateCoordinates(R->Xdisplay, R->TermWin.parent[0], wattr.root,
                              -wattr.border_width, -wattr.border_width,
                              &x, &y, &wdummy);
        rxvt_tt_printf(aR_ "\033[3;%d;%dt", x, y);
        break;
    case 14:                    /* report window size (pixels) */
        XGetWindowAttributes(R->Xdisplay, R->TermWin.parent[0], &wattr);
        rxvt_tt_printf(aR_ "\033[4;%d;%dt", wattr.height, wattr.width);
        break;
    case 18:                    /* report window size (chars) */
        rxvt_tt_printf(aR_ "\033[8;%d;%dt", R->TermWin.nrow, R->TermWin.ncol);
        break;
#if 0 /* XXX: currently disabled due to security concerns */
    case 20:                    /* report icon label */
        XGetIconName(R->Xdisplay, R->TermWin.parent[0], &s);
        rxvt_tt_printf(aR_ "\033]L%-.200s\234", s ? s : "");    /* 8bit ST */
        break;
    case 21:                    /* report window title */
        XFetchName(R->Xdisplay, R->TermWin.parent[0], &s);
        rxvt_tt_printf(aR_ "\033]l%-.200s\234", s ? s : "");    /* 8bit ST */
        break;
#endif
    }
}
#endif

/*----------------------------------------------------------------------*/
/*
 * get input up until STRING TERMINATOR (or BEL)
 * ends_how is terminator used.  returned input must be free()d
 */
/* INTPROTO */
unsigned char  *
rxvt_get_to_st(pR_ unsigned char *ends_how)
{
    int             seen_esc = 0;       /* seen escape? */
    unsigned int    n = 0;
    unsigned char  *s;
    unsigned char   ch, string[STRING_MAX];

    for (; (ch = rxvt_cmd_getc(aR));) {
        if (ch == C0_BEL
            || ch == CHAR_ST
            || (ch == 0x5c && seen_esc))        /* 7bit ST */
            break;
        if (ch == C0_ESC) {
            seen_esc = 1;
            continue;
        } else if (ch == '\t')
            ch = ' ';   /* translate '\t' to space */
        else if (ch < 0x08 || (ch > 0x0d && ch < 0x20))
            return NULL;        /* other control character - exit */
        if (n < sizeof(string) - 1)
            string[n++] = ch;
        seen_esc = 0;
    }
    string[n++] = '\0';
    if ((s = (unsigned char *)rxvt_malloc(n)) == NULL)
        return NULL;
    *ends_how = (ch == 0x5c ? C0_ESC : ch);
    STRNCPY(s, string, n);
    return s;
}

/*----------------------------------------------------------------------*/
/*
 * process DEVICE CONTROL STRING `ESC P ... (ST|BEL)' or `0x90 ... (ST|BEL)'
 */
/* INTPROTO */
void
rxvt_process_dcs_seq(pR)
{
    unsigned char    eh, *s;
/*
 * Not handled yet
 */
    s = rxvt_get_to_st(aR_ &eh);
    if (s)
        free(s);
    return;
}

/*----------------------------------------------------------------------*/
/*
 * process OPERATING SYSTEM COMMAND sequence `ESC ] Ps ; Pt (ST|BEL)'
 */
/* INTPROTO */
void
rxvt_process_osc_seq(pR)
{
    unsigned char   ch, eh, *s;
    int             arg;

    ch = rxvt_cmd_getc(aR);
    for (arg = 0; isdigit(ch); ch = rxvt_cmd_getc(aR))
        arg = arg * 10 + (ch - '0');

    if (ch == ';') {
        s = rxvt_get_to_st(aR_ &eh);
        if (s) {
    /*
     * rxvt_menubar_dispatch() violates the constness of the string,
     * so do it here
     */
            if (arg == XTerm_Menu)
#if 0 /* XXX: currently disabled due to security concerns */
                rxvt_menubar_dispatch(aR_ (char *)s);
#else
                0;
#endif
            else
                rxvt_xterm_seq(aR_ arg, (char *)s, eh);
            free(s);
        }
    }
}
/*
 * XTerm escape sequences: ESC ] Ps;Pt (ST|BEL)
 *       0 = change iconName/title
 *       1 = change iconName
 *       2 = change title
 *       4 = change color
 *      12 = change text color
 *      13 = change mouse foreground color 
 *      17 = change highlight character colour
 *      18 = change bold character color
 *      19 = change underlined character color 
 *      46 = change logfile (not implemented)
 *      50 = change font
 *
 * rxvt extensions:
 *      10 = menu (may change in future)
 *      20 = bg pixmap
 *      39 = change default fg color
 *      49 = change default bg color
 *      55 = dump scrollback buffer and all of screen
 */
/* EXTPROTO */
void
rxvt_xterm_seq(pR_ int op, const char *str, unsigned char resp __attribute__((unused)))
{
    int             changed = 0;
    int             color;
    char           *buf, *name;

    assert(str != NULL);
    switch (op) {
    case XTerm_name:
        rxvt_set_title(aR_ str);
    /* FALLTHROUGH */
    case XTerm_iconName:
        rxvt_set_iconName(aR_ str);
        break;
    case XTerm_title:
        rxvt_set_title(aR_ str);
        break;
    case XTerm_Color:
        for (buf = (char *)str; buf && *buf;) {
            if ((name = STRCHR(buf, ';')) == NULL)
                break;
            *name++ = '\0';
            color = atoi(buf);
            if (color < 0 || color >= TOTAL_COLORS)
                break;
            if ((buf = STRCHR(name, ';')) != NULL)
                *buf++ = '\0';
            rxvt_set_window_color(aR_ color + minCOLOR, name);
        }
        break;
#ifndef NO_CURSORCOLOR
    case XTerm_Color_cursor:
        rxvt_set_window_color(aR_ Color_cursor, str);
        break;
#endif
    case XTerm_Color_pointer:
        rxvt_set_window_color(aR_ Color_pointer, str);
        break;
#ifndef NO_BOLD_UNDERLINE_REVERSE
    case XTerm_Color_BD:
        rxvt_set_window_color(aR_ Color_BD, str);
        break;
    case XTerm_Color_UL:
        rxvt_set_window_color(aR_ Color_UL, str);
        break;
    case XTerm_Color_RV:
        rxvt_set_window_color(aR_ Color_RV, str);
        break;
#endif

    case XTerm_Menu:
        /*
         * rxvt_menubar_dispatch() violates the constness of the string,
         * so DON'T do it here
         */
        break;
    case XTerm_Pixmap:
        if (*str != ';') {
#if XPM_BACKGROUND
            rxvt_scale_pixmap(aR_ "");  /* reset to default scaling */
            rxvt_set_bgPixmap(aR_ str); /* change pixmap */
#endif
            rxvt_scr_touch(aR_ True);
        }
        while ((str = STRCHR(str, ';')) != NULL) {
            str++;
#if XPM_BACKGROUND
            changed += rxvt_scale_pixmap(aR_ str);
#endif
        }
        if (changed) {
#ifdef XPM_BACKGROUND
            rxvt_resize_pixmap(aR);
#endif
            rxvt_scr_touch(aR_ True);
        }
        break;

    case XTerm_restoreFG:
        rxvt_set_window_color(aR_ Color_fg, str);
        break;
    case XTerm_restoreBG:
        rxvt_set_window_color(aR_ Color_bg, str);
        break;
    case XTerm_logfile:
        break;
    case XTerm_font:
        rxvt_change_font(aR_ 0, str);
        break;
#if 0
    case XTerm_dumpscreen:      /* no error notices */
        {
            int             fd;
            if ((fd = open(str, O_RDWR | O_CREAT | O_EXCL, 0600)) >= 0) {
                rxvt_scr_dump(aR_ fd);
                close(fd);
            }
        }
        break;
#endif
    }
}
/*----------------------------------------------------------------------*/

/*{{{ process DEC private mode sequences `ESC [ ? Ps mode' */
/*
 * mode can only have the following values:
 *      'l' = low
 *      'h' = high
 *      's' = save
 *      'r' = restore
 *      't' = toggle
 * so no need for fancy checking
 */
/* INTPROTO */
int
rxvt_privcases(pR_ int mode, unsigned long bit)
{
    int             state;

    if (mode == 's') {
        R->h->SavedModes |= (R->h->PrivateModes & bit);
        return -1;
    } else {
        if (mode == 'r')
            state = (R->h->SavedModes & bit) ? 1 : 0;   /* no overlapping */
        else
            state = (mode == 't') ? !(R->h->PrivateModes & bit) : mode;
        PrivMode(state, bit);
    }
    return state;
}

/* we're not using priv _yet_ */
/* INTPROTO */
void
rxvt_process_terminal_mode(pR_ int mode, int priv __attribute__((unused)), unsigned int nargs, const int *arg)
{
    unsigned int    i, j;
    int             state;
    static const struct {
        const int       argval;
        const unsigned long bit;
    } argtopriv[] = {
        { 1, PrivMode_aplCUR },
        { 2, PrivMode_vt52 },
        { 3, PrivMode_132 },
        { 4, PrivMode_smoothScroll },
        { 5, PrivMode_rVideo },
        { 6, PrivMode_relOrigin },
        { 7, PrivMode_Autowrap },
        { 9, PrivMode_MouseX10 },
#ifdef menuBar_esc
        { menuBar_esc, PrivMode_menuBar },
#endif
#ifdef scrollBar_esc
        { scrollBar_esc, PrivMode_scrollBar },
#endif
        { 25, PrivMode_VisibleCursor },
        { 35, PrivMode_ShiftKeys },
        { 40, PrivMode_132OK },
        { 47, PrivMode_Screen },
        { 66, PrivMode_aplKP },
#ifndef NO_BACKSPACE_KEY
        { 67, PrivMode_BackSpace },
#endif
        { 1000, PrivMode_MouseX11 },
        { 1010, PrivMode_TtyOutputInh },
        { 1011, PrivMode_Keypress },
        { 1047, PrivMode_Screen },
    };

    if (nargs == 0)
        return;

/* make lo/hi boolean */
    if (mode == 'l')
        mode = 0;               /* reset */
    else if (mode == 'h')
        mode = 1;               /* set */

    for (i = 0; i < nargs; i++) {
        state = -1;

        /* basic handling */
        for (j = 0; j < (sizeof(argtopriv)/sizeof(argtopriv[0])); j++)
            if (argtopriv[j].argval == arg[i]) {
                state = rxvt_privcases(aR_ mode, argtopriv[j].bit);
                break;
            }
        
        /* extra handling for values with state unkept  */
        if (state == -1)
            switch (arg[i]) {
            case 1048:          /* alternative cursor save */
                if (mode == 0)
                    rxvt_scr_cursor(aR_ RESTORE);
                else if (mode == 1)
                    rxvt_scr_cursor(aR_ SAVE);
            /* FALLTHROUGH */
            default:
                continue;       /* for(;i;) */
            }

        /* extra handling for values with valid 0 or 1 state */
        switch (arg[i]) {
        /* case 1:      - application cursor keys */
        case 2:                 /* VT52 mode */
              /* oddball mode.  should be set regardless of set/reset
               * parameter.  Return from VT52 mode with an ESC < from
               * within VT52 mode
               */
            PrivMode(1, PrivMode_vt52);
            break;
        case 3:                 /* 80/132 */
            if (R->h->PrivateModes & PrivMode_132OK)
                rxvt_set_widthheight(aR_
                    (unsigned int)((state ? 132 : 80) * R->TermWin.fwidth),
                    (unsigned int)R->TermWin.height);
            break;
        case 4:                 /* smooth scrolling */
            if (state)
                R->Options &= ~Opt_jumpScroll;
            else
                R->Options |= Opt_jumpScroll;
            break;
        case 5:                 /* reverse video */
            rxvt_scr_rvideo_mode(aR_ state);
            break;
        case 6:                 /* relative/absolute origins  */
            rxvt_scr_relative_origin(aR_ state);
            break;
        case 7:                 /* autowrap */
            rxvt_scr_autowrap(aR_ state);
            break;
        /* case 8:      - auto repeat, can't do on a per window basis */
        case 9:                 /* X10 mouse reporting */
            if (state)          /* orthogonal */
                R->h->PrivateModes &= ~(PrivMode_MouseX11);
            break;
#ifdef menuBar_esc
        case menuBar_esc:
#ifdef MENUBAR
            rxvt_map_menuBar(aR_ state);
#endif
            break;
#endif
#ifdef scrollBar_esc
        case scrollBar_esc:
            if (rxvt_scrollbar_mapping(aR_ state)) {
                rxvt_resize_all_windows(aR_ 0, 0, 0);
                rxvt_scr_touch(aR_ True);
            }
            break;
#endif
        case 25:                /* visible/invisible cursor */
            rxvt_scr_cursor_visible(aR_ state);
            break;
        /* case 35:     - shift keys */
        /* case 40:     - 80 <--> 132 mode */
        case 47:                /* secondary screen */
            rxvt_scr_change_screen(aR_ state);
            break;
        /* case 66:     - application key pad */
        /* case 67:     - backspace key */
        case 1000:              /* X11 mouse reporting */
            if (state)          /* orthogonal */
                R->h->PrivateModes &= ~(PrivMode_MouseX10);
            break;
#if 0
        case 1001:
            break;              /* X11 mouse highlighting */
#endif
        case 1010:              /* scroll to bottom on TTY output inhibit */
            if (state)
                R->Options &= ~Opt_scrollTtyOutput;
            else
                R->Options |= Opt_scrollTtyOutput;
            break;
        case 1011:              /* scroll to bottom on key press */
            if (state)
                R->Options |= Opt_scrollTtyKeypress;
            else
                R->Options &= ~Opt_scrollTtyKeypress;
            break;
        case 1047:              /* secondary screen w/ clearing */
            if (R->h->current_screen != PRIMARY)
                rxvt_scr_erase_screen(aR_ 2);
            rxvt_scr_change_screen(aR_ state);
        /* FALLTHROUGH */
        default:
            break;
        }
    }
}
/*}}} */

/*{{{ process sgr sequences */
/* INTPROTO */
void
rxvt_process_sgr_mode(pR_ unsigned int nargs, const int *arg)
{
    unsigned int    i;
    short           rendset;
    int             rendstyle;

    if (nargs == 0) {
        rxvt_scr_rendition(aR_ 0, ~RS_None);
        return;
    }
    for (i = 0; i < nargs; i++) {
        rendset = -1;
        switch (arg[i]) {
        case 0:
            rendset = 0, rendstyle = ~RS_None;
            break;
        case 1:
            rendset = 1, rendstyle = RS_Bold;
            break;
        case 4:
            rendset = 1, rendstyle = RS_Uline;
            break;
        case 5:
            rendset = 1, rendstyle = RS_Blink;
            break;
        case 7:
            rendset = 1, rendstyle = RS_RVid;
            break;
        case 22:
            rendset = 0, rendstyle = RS_Bold;
            break;
        case 24:
            rendset = 0, rendstyle = RS_Uline;
            break;
        case 25:
            rendset = 0, rendstyle = RS_Blink;
            break;
        case 27:
            rendset = 0, rendstyle = RS_RVid;
            break;
        }
        if (rendset != -1) {
            rxvt_scr_rendition(aR_ rendset, rendstyle);
            continue;           /* for(;i;) */
        }

        switch (arg[i]) {
        case 30:
        case 31:                /* set fg color */
        case 32:
        case 33:
        case 34:
        case 35:
        case 36:
        case 37:
            rxvt_scr_color(aR_ (unsigned int)(minCOLOR + (arg[i] - 30)),
                           Color_fg);
            break;
#ifdef TTY_256COLOR
        case 38:
            if (nargs > i + 2 && arg[i + 1] == 5) {
                rxvt_scr_color(aR_ (unsigned int)(minCOLOR + arg[i + 2]),
                               Color_fg);
                i += 2;
            }
            break;
#endif
        case 39:                /* default fg */
            rxvt_scr_color(aR_ Color_fg, Color_fg);
            break;

        case 40:
        case 41:                /* set bg color */
        case 42:
        case 43:
        case 44:
        case 45:
        case 46:
        case 47:
            rxvt_scr_color(aR_ (unsigned int)(minCOLOR + (arg[i] - 40)),
                           Color_bg);
            break;
#ifdef TTY_256COLOR
        case 48:
            if (nargs > i + 2 && arg[i + 1] == 5) {
                rxvt_scr_color(aR_ (unsigned int)(minCOLOR + arg[i + 2]),
                               Color_bg);
                i += 2;
            }
            break;
#endif
        case 49:                /* default bg */
            rxvt_scr_color(aR_ Color_bg, Color_bg);
            break;

#ifndef NO_BRIGHTCOLOR
        case 90:
        case 91:                /* set bright fg color */
        case 92:
        case 93:
        case 94:
        case 95:
        case 96:
        case 97:
            rxvt_scr_color(aR_ (unsigned int)(minBrightCOLOR + (arg[i] - 90)),
                           Color_fg);
            break;
        case 100:
        case 101:               /* set bright bg color */
        case 102:
        case 103:
        case 104:
        case 105:
        case 106:
        case 107:
            rxvt_scr_color(aR_ (unsigned int)(minBrightCOLOR + (arg[i] - 100)),
                           Color_bg);
            break;
#endif
        }
    }
}
/*}}} */

/*{{{ process Rob Nation's own graphics mode sequences */
/* INTPROTO */
void
rxvt_process_graphics(pR)
{
    unsigned char   ch, cmd = rxvt_cmd_getc(aR);

#ifndef RXVT_GRAPHICS
    if (cmd == 'Q') {           /* query graphics */
        rxvt_tt_printf(aR_ "\033G0\n"); /* no graphics */
        return;
    }
/* swallow other graphics sequences until terminating ':' */
    do
        ch = rxvt_cmd_getc(aR);
    while (ch != ':');
#else
    unsigned int    nargs;
    int             args[NGRX_PTS];
    unsigned char  *text = NULL;

    if (cmd == 'Q') {           /* query graphics */
        rxvt_tt_printf(aR_ "\033G1\n"); /* yes, graphics (color) */
        return;
    }
    for (nargs = 0; nargs < (sizeof(args) / sizeof(args[0])) - 1;) {
        int             neg;

        ch = rxvt_cmd_getc(aR);
        neg = (ch == '-');
        if (neg || ch == '+')
            ch = rxvt_cmd_getc(aR);

        for (args[nargs] = 0; isdigit(ch); ch = rxvt_cmd_getc(aR))
            args[nargs] = args[nargs] * 10 + (ch - '0');
        if (neg)
            args[nargs] = -args[nargs];

        nargs++;
        args[nargs] = 0;
        if (ch != ';')
            break;
    }

    if ((cmd == 'T') && (nargs >= 5)) {
        int             i, len = args[4];

        text = rxvt_malloc((len + 1) * sizeof(char));

        if (text != NULL) {
            for (i = 0; i < len; i++)
                text[i] = rxvt_cmd_getc(aR);
            text[len] = '\0';
        }
    }
    rxvt_Gr_do_graphics(aR_ cmd, nargs, args, text);
#endif
}
/*}}} */

/* ------------------------------------------------------------------------- */

/*{{{ Read and process output from the application */
/* LIBPROTO */
void
rxvt_main_loop(pR)
{
    uint32_t ch, *str, buf[BUFSIZ];
    int nlines, refreshnow;
    struct rxvt_hidden *h = R->h;

    h->cmdbuf_ptr = h->cmdbuf_endp = h->cmdbuf_base;

    /* once we know the shell is running, send the screen size.  Again! */
    ch = rxvt_cmd_getc(aR);     /* wait for something */
    rxvt_tt_winsize(R->cmd_fd, R->TermWin.ncol, R->TermWin.nrow, R->h->cmd_pid);

    refreshnow = 0;
    for (;;) {
        if (ch == NOCHAR)
          ch = rxvt_cmd_getc(aR);

        if (ch >= ' ' || ch == '\t' || ch == '\n' || ch == '\r')
          {
            /* Read a text string from the input buffer */
            nlines = 0;
            str = buf;
            *str++ = ch;
            for (;;)
              {
                ch = next_char (aR);

                if (ch == NOCHAR || (ch < ' ' && ch != '\t' && ch != '\n' && ch != '\r'))
                  break;
                else
                  {
                    *str++ = ch;

                    if (ch == '\n')
                      {
                        nlines++;
                        h->refresh_count++;
                        if (!(R->Options & Opt_jumpScroll)
                            || (h->refresh_count >= (h->refresh_limit
                                                     * (R->TermWin.nrow - 1))))
                          {
                            refreshnow = 1;
                            ch = NOCHAR;
                            break;
                          }
                      }

                    if (str >= buf + BUFSIZ)
                      {
                        ch = NOCHAR;
                        break;
                      }
                  }
              }

            rxvt_scr_add_lines(aR_ buf, nlines, str - buf);

            /*
             * If there have been a lot of new lines, then update the screen
             * What the heck I'll cheat and only refresh less than every page-full.
             * the number of pages between refreshes is h->refresh_limit, which
             * is incremented here because we must be doing flat-out scrolling.
             *
             * refreshing should be correct for small scrolls, because of the
             * time-out
             */

            //TODO: REFRESH_PERIOD is one, fix it
            if (refreshnow)
              {
                refreshnow = 0;

                if ((R->Options & Opt_jumpScroll) && h->refresh_limit < REFRESH_PERIOD)
                  h->refresh_limit++;

                rxvt_scr_refresh(aR_ h->refresh_type);
              }

          }
        else
          {
            switch (ch)
              {
                default:
                    rxvt_process_nonprinting(aR_ ch);
                    break;
                case C0_ESC:    /* escape char */
                    rxvt_process_escape_seq(aR);
                    break;
                /* case 0x9b: */        /* CSI */
                /*  rxvt_process_csi_seq(aR); */
              }

            ch = NOCHAR;
          }
    }
/* NOTREACHED */
}

/*
 * Send printf() formatted output to the command.
 * Only use for small amounts of data.
 */
/* EXTPROTO */
void
rxvt_tt_printf(pR_ const char *fmt,...)
{
    va_list         arg_ptr;
    unsigned char   buf[256];

    va_start(arg_ptr, fmt);
    vsprintf((char *)buf, fmt, arg_ptr);
    va_end(arg_ptr);
    rxvt_tt_write(aR_ buf, (unsigned int)STRLEN(buf));
}

/* ---------------------------------------------------------------------- */
/* Addresses pasting large amounts of data and rxvt hang
 * code pinched from xterm (v_write()) and applied originally to
 * rxvt-2.18 - Hops
 * Write data to the pty as typed by the user, pasted with the mouse,
 * or generated by us in response to a query ESC sequence.
 */
/* EXTPROTO */
void
rxvt_tt_write(pR_ const unsigned char *d, unsigned int len)
{
#define MAX_PTY_WRITE 256       /* POSIX minimum MAX_INPUT */
    int             riten;
    unsigned int    p;
    unsigned char  *v_buffer,   /* start of physical buffer        */
                   *v_bufstr,   /* start of current buffer pending */
                   *v_bufptr,   /* end of current buffer pending   */
                   *v_bufend;   /* end of physical buffer          */

    if (R->h->v_bufstr == NULL && len > 0) {
        p = (len / MAX_PTY_WRITE + 1) * MAX_PTY_WRITE;
        v_buffer = v_bufstr = v_bufptr = (unsigned char *)rxvt_malloc(p);
        v_bufend = v_buffer + p;
    } else {
        v_buffer = R->h->v_buffer;
        v_bufstr = R->h->v_bufstr;
        v_bufptr = R->h->v_bufptr;
        v_bufend = R->h->v_bufend;
    }

    /*
     * Append to the block we already have.  Always doing this simplifies the
     * code, and isn't too bad, either.  If this is a short block, it isn't
     * too expensive, and if this is a long block, we won't be able to write
     * it all anyway.
     */
    if (len > 0) {
        if (v_bufend < v_bufptr + len) {        /* run out of room */
            if (v_bufstr != v_buffer) {
            /* there is unused space, move everything down */
                MEMMOVE(v_buffer, v_bufstr,
                        (unsigned int)(v_bufptr - v_bufstr));
                v_bufptr -= v_bufstr - v_buffer;
                v_bufstr = v_buffer;
            }
            if (v_bufend < v_bufptr + len) {
            /* still won't fit: get more space */
            /* use most basic realloc because an error is not fatal. */
                unsigned int    size = v_bufptr - v_buffer;
                unsigned int    reallocto;

                reallocto = ((size + len) / MAX_PTY_WRITE + 1) * MAX_PTY_WRITE;
                v_buffer = (unsigned char *)realloc(v_buffer, reallocto);
            /* save across realloc */
                if (v_buffer) {
                    v_bufstr = v_buffer;
                    v_bufptr = v_buffer + size;
                    v_bufend = v_buffer + reallocto;
                } else {        /* no memory: ignore entire write request */
                    rxvt_print_error("data loss: cannot allocate buffer space");
                    v_buffer = v_bufstr;        /* restore clobbered pointer */
                }
            }
        }
        if (v_bufend >= v_bufptr + len) {       /* new stuff will fit */
            MEMCPY(v_bufptr, d, len);
            v_bufptr += len;
        }
    }

    /*
     * Write out as much of the buffer as we can.
     * Be careful not to overflow the pty's input silo.
     * We are conservative here and only write a small amount at a time.
     *
     * If we can't push all the data into the pty yet, we expect write
     * to return a non-negative number less than the length requested
     * (if some data written) or -1 and set errno to EAGAIN,
     * EWOULDBLOCK, or EINTR (if no data written).
     *
     * (Not all systems do this, sigh, so the code is actually
     * a little more forgiving.)
     */
    if ((p = v_bufptr - v_bufstr) > 0) {
        riten = write(R->cmd_fd, v_bufstr, min(p, MAX_PTY_WRITE));
        if (riten < 0)
            riten = 0;
        v_bufstr += riten;
        if (v_bufstr >= v_bufptr)       /* we wrote it all */
            v_bufstr = v_bufptr = v_buffer;
    }
    /*
     * If we have lots of unused memory allocated, return it
     */
    if (v_bufend - v_bufptr > MAX_PTY_WRITE * 8) { /* arbitrary hysteresis */
    /* save pointers across realloc */
        unsigned int    start = v_bufstr - v_buffer;
        unsigned int    size = v_bufptr - v_buffer;
        unsigned int    reallocto;
        
        reallocto = (size / MAX_PTY_WRITE + 1) * MAX_PTY_WRITE;
        v_buffer = (unsigned char *)realloc(v_buffer, reallocto);
        if (v_buffer) {
            v_bufstr = v_buffer + start;
            v_bufptr = v_buffer + size;
            v_bufend = v_buffer + reallocto;
        } else {
        /* should we print a warning if couldn't return memory? */
            v_buffer = v_bufstr - start;        /* restore clobbered pointer */
        }
    }
    R->h->v_buffer = v_buffer;
    R->h->v_bufstr = v_bufstr;
    R->h->v_bufptr = v_bufptr;
    R->h->v_bufend = v_bufend;
}
/*----------------------- end-of-file (C source) -----------------------*/

Revision:	1.2
Committed:	Mon Nov 24 17:31:27 2003 UTC (20 years, 5 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+0 -0 lines
Log Message:	* empty log message *