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ed.screen.c

/* $Header: /src/pub/tcsh/ed.screen.c,v 3.50 2003/02/08 20:03:25 christos Exp $ */
/*
 * ed.screen.c: Editor/termcap-curses interface
 */
/*-
 * Copyright (c) 1980, 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
#include "sh.h"

RCSID("$Id: ed.screen.c,v 3.50 2003/02/08 20:03:25 christos Exp $")

#include "ed.h"
#include "tc.h"
#include "ed.defns.h"

#ifndef POSIX
/*
 * We don't prototype these, cause some systems have them wrong!
 */
extern int   tgetent    __P(());
extern char *tgetstr    __P(());
extern int   tgetflag   __P(());
extern int   tgetnum    __P(());
extern char *tgoto      __P(());
# define PUTPURE putpure
# define PUTRAW putraw
#else
extern int   tgetent    __P((char *, char *));
extern char *tgetstr    __P((char *, char **));
extern int   tgetflag   __P((char *));
extern int   tgetnum    __P((char *));
extern char *tgoto      __P((char *, int, int));
extern void  tputs      __P((char *, int, void (*)(int)));
# define PUTPURE ((void (*)__P((int))) putpure)
# define PUTRAW ((void (*)__P((int))) putraw)
#endif


/* #define DEBUG_LITERAL */

/*
 * IMPORTANT NOTE: these routines are allowed to look at the current screen
 * and the current possition assuming that it is correct.  If this is not
 * true, then the update will be WRONG!  This is (should be) a valid
 * assumption...
 */

#define TC_BUFSIZE 2048

#define GoodStr(a) (tstr[a].str != NULL && tstr[a].str[0] != '\0')
#define Str(a) tstr[a].str
#define Val(a) tval[a].val

static struct {
    char   *b_name;
    int     b_rate;
}       baud_rate[] = {

#ifdef B0
    { "0", B0 },
#endif
#ifdef B50
    { "50", B50 },
#endif
#ifdef B75
    { "75", B75 },
#endif
#ifdef B110
    { "110", B110 },
#endif
#ifdef B134
    { "134", B134 },
#endif
#ifdef B150
    { "150", B150 },
#endif
#ifdef B200
    { "200", B200 },
#endif
#ifdef B300
    { "300", B300 },
#endif
#ifdef B600
    { "600", B600 },
#endif
#ifdef B900
    { "900", B900 },
#endif
#ifdef B1200
    { "1200", B1200 },
#endif
#ifdef B1800
    { "1800", B1800 },
#endif
#ifdef B2400
    { "2400", B2400 },
#endif
#ifdef B3600
    { "3600", B3600 },
#endif
#ifdef B4800
    { "4800", B4800 },
#endif
#ifdef B7200
    { "7200", B7200 },
#endif
#ifdef B9600
    { "9600", B9600 },
#endif
#ifdef EXTA
    { "19200", EXTA },
#endif
#ifdef B19200
    { "19200", B19200 },
#endif
#ifdef EXTB
    { "38400", EXTB },
#endif
#ifdef B38400
    { "38400", B38400 },
#endif
    { NULL, 0 }
};

#define T_al      0
#define T_bl      1
#define T_cd      2
#define T_ce      3
#define T_ch      4
#define T_cl      5
#define     T_dc  6
#define     T_dl  7
#define     T_dm  8
#define     T_ed  9
#define     T_ei  10
#define     T_fs  11
#define     T_ho  12
#define     T_ic  13
#define     T_im  14 
#define     T_ip  15
#define     T_kd  16
#define     T_kl  17
#define T_kr      18
#define T_ku      19
#define T_md      20
#define T_me      21
#define T_nd      22
#define T_se      23
#define T_so      24
#define T_ts      25
#define T_up      26
#define T_us      27
#define T_ue      28
#define T_vb      29
#define T_DC      30
#define T_DO      31
#define T_IC      32
#define T_LE      33
#define T_RI      34
#define T_UP      35
#define T_kh    36
#define T_at7   37
#define T_str   38
static struct termcapstr {
    char   *name;
    char   *long_name;
    char   *str;
} tstr[T_str + 1];


#define T_am      0
#define T_pt      1
#define T_li      2
#define T_co      3
#define T_km      4
#define T_xn      5
#define T_val     6
static struct termcapval {
    char   *name;
    char   *long_name;
    int     val;
} tval[T_val + 1];

void
terminit()
{
#ifdef NLS_CATALOGS
    int i;

    for (i = 0; i < T_str + 1; i++)
      xfree((ptr_t) tstr[i].long_name);

    for (i = 0; i < T_val + 1; i++)
      xfree((ptr_t) tval[i].long_name);
#endif

    tstr[T_al].name = "al";
    tstr[T_al].long_name = CSAVS(4, 1, "add new blank line");

    tstr[T_bl].name = "bl";
    tstr[T_bl].long_name = CSAVS(4, 2, "audible bell");

    tstr[T_cd].name = "cd";
    tstr[T_cd].long_name = CSAVS(4, 3, "clear to bottom");

    tstr[T_ce].name = "ce";
    tstr[T_ce].long_name = CSAVS(4, 4, "clear to end of line");

    tstr[T_ch].name = "ch";
    tstr[T_ch].long_name = CSAVS(4, 5, "cursor to horiz pos");

    tstr[T_cl].name = "cl";
    tstr[T_cl].long_name = CSAVS(4, 6, "clear screen");

    tstr[T_dc].name = "dc";
    tstr[T_dc].long_name = CSAVS(4, 7, "delete a character");

    tstr[T_dl].name = "dl";
    tstr[T_dl].long_name = CSAVS(4, 8, "delete a line");

    tstr[T_dm].name = "dm";
    tstr[T_dm].long_name = CSAVS(4, 9, "start delete mode");

    tstr[T_ed].name = "ed";
    tstr[T_ed].long_name = CSAVS(4, 10, "end delete mode");

    tstr[T_ei].name = "ei";
    tstr[T_ei].long_name = CSAVS(4, 11, "end insert mode");

    tstr[T_fs].name = "fs";
    tstr[T_fs].long_name = CSAVS(4, 12, "cursor from status line");

    tstr[T_ho].name = "ho";
    tstr[T_ho].long_name = CSAVS(4, 13, "home cursor");

    tstr[T_ic].name = "ic";
    tstr[T_ic].long_name = CSAVS(4, 14, "insert character");

    tstr[T_im].name = "im";
    tstr[T_im].long_name = CSAVS(4, 15, "start insert mode");

    tstr[T_ip].name = "ip";
    tstr[T_ip].long_name = CSAVS(4, 16, "insert padding");

    tstr[T_kd].name = "kd";
    tstr[T_kd].long_name = CSAVS(4, 17, "sends cursor down");

    tstr[T_kl].name = "kl";
    tstr[T_kl].long_name = CSAVS(4, 18, "sends cursor left");

    tstr[T_kr].name = "kr";
    tstr[T_kr].long_name = CSAVS(4, 19, "sends cursor right");

    tstr[T_ku].name = "ku";
    tstr[T_ku].long_name = CSAVS(4, 20, "sends cursor up");

    tstr[T_md].name = "md";
    tstr[T_md].long_name = CSAVS(4, 21, "begin bold");

    tstr[T_me].name = "me";
    tstr[T_me].long_name = CSAVS(4, 22, "end attributes");

    tstr[T_nd].name = "nd";
    tstr[T_nd].long_name = CSAVS(4, 23, "non destructive space");

    tstr[T_se].name = "se";
    tstr[T_se].long_name = CSAVS(4, 24, "end standout");

    tstr[T_so].name = "so";
    tstr[T_so].long_name = CSAVS(4, 25, "begin standout");

    tstr[T_ts].name = "ts";
    tstr[T_ts].long_name = CSAVS(4, 26, "cursor to status line");

    tstr[T_up].name = "up";
    tstr[T_up].long_name = CSAVS(4, 27, "cursor up one");

    tstr[T_us].name = "us";
    tstr[T_us].long_name = CSAVS(4, 28, "begin underline");

    tstr[T_ue].name = "ue";
    tstr[T_ue].long_name = CSAVS(4, 29, "end underline");

    tstr[T_vb].name = "vb";
    tstr[T_vb].long_name = CSAVS(4, 30, "visible bell");

    tstr[T_DC].name = "DC";
    tstr[T_DC].long_name = CSAVS(4, 31, "delete multiple chars");

    tstr[T_DO].name = "DO";
    tstr[T_DO].long_name = CSAVS(4, 32, "cursor down multiple");

    tstr[T_IC].name = "IC";
    tstr[T_IC].long_name = CSAVS(4, 33, "insert multiple chars");

    tstr[T_LE].name = "LE";
    tstr[T_LE].long_name = CSAVS(4, 34, "cursor left multiple");

    tstr[T_RI].name = "RI";
    tstr[T_RI].long_name = CSAVS(4, 35, "cursor right multiple");

    tstr[T_UP].name = "UP";
    tstr[T_UP].long_name = CSAVS(4, 36, "cursor up multiple");

    tstr[T_kh].name = "kh";
    tstr[T_kh].long_name = CSAVS(4, 37, "send cursor home");

    tstr[T_at7].name = "@7";
    tstr[T_at7].long_name = CSAVS(4, 38, "send cursor end");

    tstr[T_str].name = NULL;
    tstr[T_str].long_name = NULL;


    tval[T_am].name = "am";
    tval[T_am].long_name = CSAVS(4, 37, "Has automatic margins");

    tval[T_pt].name = "pt";
    tval[T_pt].long_name = CSAVS(4, 38, "Can use physical tabs");

    tval[T_li].name = "li";
    tval[T_li].long_name = CSAVS(4, 39, "Number of lines");

    tval[T_co].name = "co";
    tval[T_co].long_name = CSAVS(4, 40, "Number of columns");

    tval[T_km].name = "km";
    tval[T_km].long_name = CSAVS(4, 41, "Has meta key");

    tval[T_xn].name = "xn";
    tval[T_xn].long_name = CSAVS(4, 42, "Newline ignored at right margin");

    tval[T_val].name = NULL;
    tval[T_val].long_name = NULL;
}

/*
 * A very useful table from justin@crim.ca (Justin Bur) :-)
 * (Modified by per@erix.ericsson.se (Per Hedeland)
 *  - first (and second:-) case fixed)
 *
 * Description     Termcap variables       tcsh behavior
 *             am      xn              UseRightmost    SendCRLF
 * --------------  ------- -------         ------------    ------------
 * Automargins     yes     no              yes             no
 * Magic Margins   yes     yes             yes             no
 * No Wrap         no      --              yes             yes
 */

static bool me_all = 0;       /* does two or more of the attributes use me */

static      void  ReBufferDisplay   __P((void));
static      void  TCalloc           __P((struct termcapstr *, char *)); 


static void
TCalloc(t, cap)
    struct termcapstr *t;
    char   *cap;
{
    static char termcap_alloc[TC_BUFSIZE];
    char    termbuf[TC_BUFSIZE];
    struct termcapstr *ts;
    static int tloc = 0;
    int     tlen, clen;

    if (cap == NULL || *cap == '\0') {
      t->str = NULL;
      return;
    }
    else
      clen = strlen(cap);

    if (t->str == NULL)
      tlen = 0;
    else
      tlen = strlen(t->str);

    /*
     * New string is shorter; no need to allocate space
     */
    if (clen <= tlen) {
      (void) strcpy(t->str, cap);
      return;
    }

    /*
     * New string is longer; see if we have enough space to append
     */
    if (tloc + 3 < TC_BUFSIZE) {
      (void) strcpy(t->str = &termcap_alloc[tloc], cap);
      tloc += clen + 1; /* one for \0 */
      return;
    }

    /*
     * Compact our buffer; no need to check compaction, cause we know it
     * fits...
     */
    tlen = 0;
    for (ts = tstr; ts->name != NULL; ts++)
      if (t != ts && ts->str != NULL && ts->str[0] != '\0') {
          char   *ptr;

          for (ptr = ts->str; *ptr != '\0'; termbuf[tlen++] = *ptr++)
            continue;
          termbuf[tlen++] = '\0';
      }
    (void) memmove((ptr_t) termcap_alloc, (ptr_t) termbuf, (size_t) TC_BUFSIZE);
    tloc = tlen;
    if (tloc + 3 >= TC_BUFSIZE) {
      stderror(ERR_NAME | ERR_TCNOSTR);
      return;
    }
    (void) strcpy(t->str = &termcap_alloc[tloc], cap);
    tloc += clen + 1;         /* one for \0 */
    return;
}


/*ARGSUSED*/
void
TellTC(what)
    char   *what;
{
    struct termcapstr *t;

    USE(what);
    xprintf(CGETS(7, 1, "\n\tTcsh thinks your terminal has the\n"));
    xprintf(CGETS(7, 2, "\tfollowing characteristics:\n\n"));
    xprintf(CGETS(7, 3, "\tIt has %d columns and %d lines\n"),
          Val(T_co), Val(T_li));
    xprintf(CGETS(7, 4, "\tIt has %s meta key\n"), T_HasMeta ?
          CGETS(7, 5, "a") : CGETS(7, 6, "no"));
    xprintf(CGETS(7, 7, "\tIt can%s use tabs\n"), T_Tabs ?
          "" : CGETS(7, 8, " not"));
    xprintf(CGETS(7, 9, "\tIt %s automatic margins\n"),
                (T_Margin&MARGIN_AUTO)?
                CGETS(7, 10, "has"):
                CGETS(7, 11, "does not have"));
    if (T_Margin & MARGIN_AUTO)
      xprintf(CGETS(7, 12, "\tIt %s magic margins\n"),
                  (T_Margin & MARGIN_MAGIC) ?
                  CGETS(7, 10, "has"):
                  CGETS(7, 11, "does not have"));

    for (t = tstr; t->name != NULL; t++)
      xprintf("\t%36s (%s) == %s\n", t->long_name, t->name,
            t->str && *t->str ? t->str : CGETS(7, 13, "(empty)"));
    xputchar('\n');
}


static void
ReBufferDisplay()
{
    register int i;
    Char  **b;
    Char  **bufp;

    b = Display;
    Display = NULL;
    if (b != NULL) {
      for (bufp = b; *bufp != NULL; bufp++)
          xfree((ptr_t) * bufp);
      xfree((ptr_t) b);
    }
    b = Vdisplay;
    Vdisplay = NULL;
    if (b != NULL) {
      for (bufp = b; *bufp != NULL; bufp++)
          xfree((ptr_t) * bufp);
      xfree((ptr_t) b);
    }
    TermH = Val(T_co);
    TermV = (INBUFSIZE * 4) / TermH + 1;
    b = (Char **) xmalloc((size_t) (sizeof(Char *) * (TermV + 1)));
    for (i = 0; i < TermV; i++)
      b[i] = (Char *) xmalloc((size_t) (sizeof(Char) * (TermH + 1)));
    b[TermV] = NULL;
    Display = b;
    b = (Char **) xmalloc((size_t) (sizeof(Char *) * (TermV + 1)));
    for (i = 0; i < TermV; i++)
      b[i] = (Char *) xmalloc((size_t) (sizeof(Char) * (TermH + 1)));
    b[TermV] = NULL;
    Vdisplay = b;
}

void
SetTC(what, how)
    char   *what, *how;
{
    struct termcapstr *ts;
    struct termcapval *tv;

    /*
     * Do the strings first
     */
    setname("settc");
    for (ts = tstr; ts->name != NULL; ts++)
      if (strcmp(ts->name, what) == 0)
          break;
    if (ts->name != NULL) {
      TCalloc(ts, how);
      /*
       * Reset variables
       */
      if (GoodStr(T_me) && GoodStr(T_ue))
          me_all = (strcmp(Str(T_me), Str(T_ue)) == 0);
      else
          me_all = 0;
      if (GoodStr(T_me) && GoodStr(T_se))
          me_all |= (strcmp(Str(T_me), Str(T_se)) == 0);

      T_CanCEOL = GoodStr(T_ce);
      T_CanDel = GoodStr(T_dc) || GoodStr(T_DC);
      T_CanIns = GoodStr(T_im) || GoodStr(T_ic) || GoodStr(T_IC);
      T_CanUP = GoodStr(T_up) || GoodStr(T_UP);
      return;
    }

    /*
     * Do the numeric ones second
     */
    for (tv = tval; tv->name != NULL; tv++)
      if (strcmp(tv->name, what) == 0)
          break;

    if (tv->name != NULL) {
      if (tv == &tval[T_pt] || tv == &tval[T_km] || 
          tv == &tval[T_am] || tv == &tval[T_xn]) {
          if (strcmp(how, "yes") == 0)
            tv->val = 1;
          else if (strcmp(how, "no") == 0)
            tv->val = 0;
          else {
            stderror(ERR_SETTCUS, tv->name);
            return;
          }
          T_Tabs = (Char) Val(T_pt);
          T_HasMeta = (Char) Val(T_km);
          T_Margin = (Char) Val(T_am) ? MARGIN_AUTO : 0;
          T_Margin |= (Char) Val(T_xn) ? MARGIN_MAGIC : 0;
          if (tv == &tval[T_am] || tv == &tval[T_xn]) 
            ChangeSize(Val(T_li), Val(T_co));
          return;
      }
      else {
          tv->val = atoi(how);
          T_Cols = (Char) Val(T_co);
          T_Lines = (Char) Val(T_li);
          if (tv == &tval[T_co] || tv == &tval[T_li])
            ChangeSize(Val(T_li), Val(T_co));
          return;
      }
    }
    stderror(ERR_NAME | ERR_TCCAP, what);
    return;
}


/*
 * Print the termcap string out with variable substitution
 */
void
EchoTC(v)
    Char  **v;
{
    char   *cap, *scap, cv[BUFSIZE];
    int     arg_need, arg_cols, arg_rows;
    int     verbose = 0, silent = 0;
    char   *area;
    static char *fmts = "%s\n", *fmtd = "%d\n";
    struct termcapstr *t;
    char    buf[TC_BUFSIZE];

    area = buf;

    setname("echotc");

    tglob(v);
    if (gflag) {
      v = globall(v);
      if (v == 0)
          stderror(ERR_NAME | ERR_NOMATCH);
    }
    else
      v = gargv = saveblk(v);
    trim(v);

    if (!*v || *v[0] == '\0')
      return;
    if (v[0][0] == '-') {
      switch (v[0][1]) {
      case 'v':
          verbose = 1;
          break;
      case 's':
          silent = 1;
          break;
      default:
          stderror(ERR_NAME | ERR_TCUSAGE);
          break;
      }
      v++;
    }
    if (!*v || *v[0] == '\0')
      return;
    (void) strcpy(cv, short2str(*v));
    if (strcmp(cv, "tabs") == 0) {
      xprintf(fmts, T_Tabs ? CGETS(7, 14, "yes") :
            CGETS(7, 15, "no"));
      flush();
      return;
    }
    else if (strcmp(cv, "meta") == 0) {
      xprintf(fmts, Val(T_km) ? CGETS(7, 14, "yes") :
            CGETS(7, 15, "no"));
      flush();
      return;
    }
    else if (strcmp(cv, "xn") == 0) {
      xprintf(fmts, T_Margin & MARGIN_MAGIC ? CGETS(7, 14, "yes") :
            CGETS(7, 15,  "no"));
      flush();
      return;
    }
    else if (strcmp(cv, "am") == 0) {
      xprintf(fmts, T_Margin & MARGIN_AUTO ? CGETS(7, 14, "yes") :
            CGETS(7, 15, "no"));
      flush();
      return;
    }
    else if (strcmp(cv, "baud") == 0) {
      int     i;

      for (i = 0; baud_rate[i].b_name != NULL; i++)
          if (T_Speed == baud_rate[i].b_rate) {
            xprintf(fmts, baud_rate[i].b_name);
            flush();
            return;
          }
      xprintf(fmtd, 0);
      flush();
      return;
    }
    else if (strcmp(cv, "rows") == 0 || strcmp(cv, "lines") == 0) {
      xprintf(fmtd, Val(T_li));
      flush();
      return;
    }
    else if (strcmp(cv, "cols") == 0) {
      xprintf(fmtd, Val(T_co));
      flush();
      return;
    }

    /* 
     * Try to use our local definition first
     */
    scap = NULL;
    for (t = tstr; t->name != NULL; t++)
      if (strcmp(t->name, cv) == 0) {
          scap = t->str;
          break;
      }
    if (t->name == NULL)
      scap = tgetstr(cv, &area);
    if (!scap || scap[0] == '\0') {
      if (tgetflag(cv)) {
          xprintf(CGETS(7, 14, "yes\n"));
          return;
      }
      if (silent)
          return;
      else
          stderror(ERR_NAME | ERR_TCCAP, cv);
    }

    /*
     * Count home many values we need for this capability.
     */
    for (cap = scap, arg_need = 0; *cap; cap++)
      if (*cap == '%')
          switch (*++cap) {
          case 'd':
          case '2':
          case '3':
          case '.':
          case '+':
            arg_need++;
            break;
          case '%':
          case '>':
          case 'i':
          case 'r':
          case 'n':
          case 'B':
          case 'D':
            break;
          default:
            /*
             * hpux has lot's of them...
             */
            if (verbose)
                stderror(ERR_NAME | ERR_TCPARM, *cap);
            /* This is bad, but I won't complain */
            break;
          }

    switch (arg_need) {
    case 0:
      v++;
      if (*v && *v[0]) {
          if (silent)
            return;
          else
            stderror(ERR_NAME | ERR_TCARGS, cv, arg_need);
      }
      (void) tputs(scap, 1, PUTRAW);
      break;
    case 1:
      v++;
      if (!*v || *v[0] == '\0')
          stderror(ERR_NAME | ERR_TCNARGS, cv, 1);
      arg_cols = 0;
      arg_rows = atoi(short2str(*v));
      v++;
      if (*v && *v[0]) {
          if (silent)
            return;
          else
            stderror(ERR_NAME | ERR_TCARGS, cv, arg_need);
      }
      (void) tputs(tgoto(scap, arg_cols, arg_rows), 1, PUTRAW);
      break;
    default:
      /* This is wrong, but I will ignore it... */
      if (verbose)
          stderror(ERR_NAME | ERR_TCARGS, cv, arg_need);
      /*FALLTHROUGH*/
    case 2:
      v++;
      if (!*v || *v[0] == '\0') {
          if (silent)
            return;
          else
            stderror(ERR_NAME | ERR_TCNARGS, cv, 2);
      }
      arg_cols = atoi(short2str(*v));
      v++;
      if (!*v || *v[0] == '\0') {
          if (silent)
            return;
          else
            stderror(ERR_NAME | ERR_TCNARGS, cv, 2);
      }
      arg_rows = atoi(short2str(*v));
      v++;
      if (*v && *v[0]) {
          if (silent)
            return;
          else
            stderror(ERR_NAME | ERR_TCARGS, cv, arg_need);
      }
      (void) tputs(tgoto(scap, arg_cols, arg_rows), arg_rows, PUTRAW);
      break;
    }
    flush();
    if (gargv) {
      blkfree(gargv);
      gargv = 0;
    }
}

bool    GotTermCaps = 0;

static struct {
    Char   *name;
    int     key;
    XmapVal fun;
    int         type;
} arrow[] = {
#define A_K_DN    0
    { STRdown,    T_kd },
#define A_K_UP    1
    { STRup,      T_ku },
#define A_K_LT    2
    { STRleft,    T_kl },
#define A_K_RT    3
    { STRright, T_kr },
#define A_K_HO  4
    { STRhome,  T_kh },
#define A_K_EN  5
    { STRend,   T_at7}
};
#define A_K_NKEYS 6

void
ResetArrowKeys()
{
    arrow[A_K_DN].fun.cmd = F_DOWN_HIST;
    arrow[A_K_DN].type    = XK_CMD;

    arrow[A_K_UP].fun.cmd = F_UP_HIST;
    arrow[A_K_UP].type    = XK_CMD;

    arrow[A_K_LT].fun.cmd = F_CHARBACK;
    arrow[A_K_LT].type    = XK_CMD;

    arrow[A_K_RT].fun.cmd = F_CHARFWD;
    arrow[A_K_RT].type    = XK_CMD;

    arrow[A_K_HO].fun.cmd = F_TOBEG;
    arrow[A_K_HO].type    = XK_CMD;

    arrow[A_K_EN].fun.cmd = F_TOEND;
    arrow[A_K_EN].type    = XK_CMD;
}

void
DefaultArrowKeys() 
{
    static Char strA[] = {033, '[', 'A', '\0'};
    static Char strB[] = {033, '[', 'B', '\0'};
    static Char strC[] = {033, '[', 'C', '\0'};
    static Char strD[] = {033, '[', 'D', '\0'};
    static Char strH[] = {033, '[', 'H', '\0'};
    static Char strF[] = {033, '[', 'F', '\0'};
    static Char stOA[] = {033, 'O', 'A', '\0'};
    static Char stOB[] = {033, 'O', 'B', '\0'};
    static Char stOC[] = {033, 'O', 'C', '\0'};
    static Char stOD[] = {033, 'O', 'D', '\0'};
    static Char stOH[] = {033, 'O', 'H', '\0'};
    static Char stOF[] = {033, 'O', 'F', '\0'};

    CStr cs;
#ifndef IS_ASCII
    if (strA[0] == 033)
    {
      strA[0] = CTL_ESC('\033');
      strB[0] = CTL_ESC('\033');
      strC[0] = CTL_ESC('\033');
      strD[0] = CTL_ESC('\033');
      strH[0] = CTL_ESC('\033');
      strF[0] = CTL_ESC('\033');
      stOA[0] = CTL_ESC('\033');
      stOB[0] = CTL_ESC('\033');
      stOC[0] = CTL_ESC('\033');
      stOD[0] = CTL_ESC('\033');
      stOH[0] = CTL_ESC('\033');
      stOF[0] = CTL_ESC('\033');
    }
#endif

    cs.len = 3;

    cs.buf = strA; AddXkey(&cs, &arrow[A_K_UP].fun, arrow[A_K_UP].type);
    cs.buf = strB; AddXkey(&cs, &arrow[A_K_DN].fun, arrow[A_K_DN].type);
    cs.buf = strC; AddXkey(&cs, &arrow[A_K_RT].fun, arrow[A_K_RT].type);
    cs.buf = strD; AddXkey(&cs, &arrow[A_K_LT].fun, arrow[A_K_LT].type);
    cs.buf = strH; AddXkey(&cs, &arrow[A_K_HO].fun, arrow[A_K_HO].type);
    cs.buf = strF; AddXkey(&cs, &arrow[A_K_EN].fun, arrow[A_K_EN].type);
    cs.buf = stOA; AddXkey(&cs, &arrow[A_K_UP].fun, arrow[A_K_UP].type);
    cs.buf = stOB; AddXkey(&cs, &arrow[A_K_DN].fun, arrow[A_K_DN].type);
    cs.buf = stOC; AddXkey(&cs, &arrow[A_K_RT].fun, arrow[A_K_RT].type);
    cs.buf = stOD; AddXkey(&cs, &arrow[A_K_LT].fun, arrow[A_K_LT].type);
    cs.buf = stOH; AddXkey(&cs, &arrow[A_K_HO].fun, arrow[A_K_HO].type);
    cs.buf = stOF; AddXkey(&cs, &arrow[A_K_EN].fun, arrow[A_K_EN].type);

    if (VImode) {
      cs.len = 2;
      cs.buf = &strA[1]; AddXkey(&cs, &arrow[A_K_UP].fun, arrow[A_K_UP].type);
      cs.buf = &strB[1]; AddXkey(&cs, &arrow[A_K_DN].fun, arrow[A_K_DN].type);
      cs.buf = &strC[1]; AddXkey(&cs, &arrow[A_K_RT].fun, arrow[A_K_RT].type);
      cs.buf = &strD[1]; AddXkey(&cs, &arrow[A_K_LT].fun, arrow[A_K_LT].type);
      cs.buf = &strH[1]; AddXkey(&cs, &arrow[A_K_HO].fun, arrow[A_K_HO].type);
      cs.buf = &strF[1]; AddXkey(&cs, &arrow[A_K_EN].fun, arrow[A_K_EN].type);
      cs.buf = &stOA[1]; AddXkey(&cs, &arrow[A_K_UP].fun, arrow[A_K_UP].type);
      cs.buf = &stOB[1]; AddXkey(&cs, &arrow[A_K_DN].fun, arrow[A_K_DN].type);
      cs.buf = &stOC[1]; AddXkey(&cs, &arrow[A_K_RT].fun, arrow[A_K_RT].type);
      cs.buf = &stOD[1]; AddXkey(&cs, &arrow[A_K_LT].fun, arrow[A_K_LT].type);
      cs.buf = &stOH[1]; AddXkey(&cs, &arrow[A_K_HO].fun, arrow[A_K_HO].type);
      cs.buf = &stOF[1]; AddXkey(&cs, &arrow[A_K_EN].fun, arrow[A_K_EN].type);
    }
}


int
SetArrowKeys(name, fun, type)
    CStr *name;
    XmapVal *fun;
    int type;
{
    int i;
    for (i = 0; i < A_K_NKEYS; i++)
      if (Strcmp(name->buf, arrow[i].name) == 0) {
          arrow[i].fun  = *fun;
          arrow[i].type = type;
          return 0;
      }
    return -1;
}

int
IsArrowKey(name)
    Char *name;
{
    int i;
    for (i = 0; i < A_K_NKEYS; i++)
      if (Strcmp(name, arrow[i].name) == 0)
          return 1;
    return 0;
}

int
ClearArrowKeys(name)
    CStr *name;
{
    int i;
    for (i = 0; i < A_K_NKEYS; i++)
      if (Strcmp(name->buf, arrow[i].name) == 0) {
          arrow[i].type = XK_NOD;
          return 0;
      }
    return -1;
}

void
PrintArrowKeys(name)
    CStr *name;
{
    int i;

    for (i = 0; i < A_K_NKEYS; i++)
      if (name->len == 0 || Strcmp(name->buf, arrow[i].name) == 0)
          if (arrow[i].type != XK_NOD) {
            CStr cs;
            cs.buf = arrow[i].name;
            cs.len = Strlen(cs.buf);
            (void) printOne(&cs, &arrow[i].fun, arrow[i].type);
          }
}


void
BindArrowKeys()
{
    KEYCMD *map, *dmap;
    int     i, j;
    char   *p;
    CStr    cs;

    if (!GotTermCaps)
      return;
    map = VImode ? CcAltMap : CcKeyMap;
    dmap = VImode ? CcViCmdMap : CcEmacsMap;

    DefaultArrowKeys();

    for (i = 0; i < A_K_NKEYS; i++) {
      p = tstr[arrow[i].key].str;
      if (p && *p) {
          j = (unsigned char) *p;
          cs.buf = str2short(p);
          cs.len = Strlen(cs.buf);
          /*
           * Assign the arrow keys only if:
           *
           * 1. They are multi-character arrow keys and the user 
           *    has not re-assigned the leading character, or 
           *    has re-assigned the leading character to be F_XKEY
           * 2. They are single arrow keys pointing to an unassigned key.
           */
          if (arrow[i].type == XK_NOD) {
            ClearXkey(map, &cs);
          }
          else {
            if (p[1] && (dmap[j] == map[j] || map[j] == F_XKEY)) {
                AddXkey(&cs, &arrow[i].fun, arrow[i].type);
                map[j] = F_XKEY;
            }
            else if (map[j] == F_UNASSIGNED) {
                ClearXkey(map, &cs);
                if (arrow[i].type == XK_CMD)
                  map[j] = arrow[i].fun.cmd;
                else
                  AddXkey(&cs, &arrow[i].fun, arrow[i].type);
            }
          }
      }
    }
}

static Char cur_atr = 0;      /* current attributes */

void
SetAttributes(atr)
    int     atr;
{
    atr &= ATTRIBUTES;
    if (atr != cur_atr) {
      if (me_all && GoodStr(T_me)) {
          if (((cur_atr & BOLD) && !(atr & BOLD)) ||
            ((cur_atr & UNDER) && !(atr & UNDER)) ||
            ((cur_atr & STANDOUT) && !(atr & STANDOUT))) {
            (void) tputs(Str(T_me), 1, PUTPURE);
            cur_atr = 0;
          }
      }
      if ((atr & BOLD) != (cur_atr & BOLD)) {
          if (atr & BOLD) {
            if (GoodStr(T_md) && GoodStr(T_me)) {
                (void) tputs(Str(T_md), 1, PUTPURE);
                cur_atr |= BOLD;
            }
          }
          else {
            if (GoodStr(T_md) && GoodStr(T_me)) {
                (void) tputs(Str(T_me), 1, PUTPURE);
                if ((cur_atr & STANDOUT) && GoodStr(T_se)) {
                  (void) tputs(Str(T_se), 1, PUTPURE);
                  cur_atr &= ~STANDOUT;
                }
                if ((cur_atr & UNDER) && GoodStr(T_ue)) {
                  (void) tputs(Str(T_ue), 1, PUTPURE);
                  cur_atr &= ~UNDER;
                }
                cur_atr &= ~BOLD;
            }
          }
      }
      if ((atr & STANDOUT) != (cur_atr & STANDOUT)) {
          if (atr & STANDOUT) {
            if (GoodStr(T_so) && GoodStr(T_se)) {
                (void) tputs(Str(T_so), 1, PUTPURE);
                cur_atr |= STANDOUT;
            }
          }
          else {
            if (GoodStr(T_se)) {
                (void) tputs(Str(T_se), 1, PUTPURE);
                cur_atr &= ~STANDOUT;
            }
          }
      }
      if ((atr & UNDER) != (cur_atr & UNDER)) {
          if (atr & UNDER) {
            if (GoodStr(T_us) && GoodStr(T_ue)) {
                (void) tputs(Str(T_us), 1, PUTPURE);
                cur_atr |= UNDER;
            }
          }
          else {
            if (GoodStr(T_ue)) {
                (void) tputs(Str(T_ue), 1, PUTPURE);
                cur_atr &= ~UNDER;
            }
          }
      }
    }
}

/* PWP 6-27-88 -- if the tty driver thinks that we can tab, we ask termcap */
int
CanWeTab()
{
    return (Val(T_pt));
}

void
MoveToLine(where)       /* move to line <where> (first line == 0) */
    int     where;            /* as efficiently as possible; */
{
    int     del;

    if (where == CursorV)
      return;

    if (where > TermV) {
#ifdef DEBUG_SCREEN
      xprintf("MoveToLine: where is ridiculous: %d\r\n", where);
      flush();
#endif /* DEBUG_SCREEN */
      return;
    }

    del = where - CursorV;

    if (del > 0) {
      while (del > 0) {
          if ((T_Margin & MARGIN_AUTO) && Display[CursorV][0] != '\0') {
            /* move without newline */
            MoveToChar(TermH - 1);
            so_write(&Display[CursorV][CursorH], 1); /* updates CursorH/V*/
            del--;
          }
          else {
            if ((del > 1) && GoodStr(T_DO)) {
                (void) tputs(tgoto(Str(T_DO), del, del), del, PUTPURE);
                del = 0;
            }
            else {
                for ( ; del > 0; del--) 
                  (void) putraw('\n');
                CursorH = 0;  /* because the \n will become \r\n */
            }
          }
      }
    }
    else {              /* del < 0 */
      if (GoodStr(T_UP) && (-del > 1 || !GoodStr(T_up)))
          (void) tputs(tgoto(Str(T_UP), -del, -del), -del, PUTPURE);
      else {
          int i;
          if (GoodStr(T_up))
            for (i = 0; i < -del; i++)
                (void) tputs(Str(T_up), 1, PUTPURE);
      }
    }
    CursorV = where;          /* now where is here */
}

void
MoveToChar(where)       /* move to character position (where) */
    int     where;
{                       /* as efficiently as possible */
    int     del;

mc_again:
    if (where == CursorH)
      return;

    if (where >= TermH) {
#ifdef DEBUG_SCREEN
      xprintf("MoveToChar: where is riduculous: %d\r\n", where);
      flush();
#endif /* DEBUG_SCREEN */
      return;
    }

    if (!where) {       /* if where is first column */
      (void) putraw('\r');    /* do a CR */
      CursorH = 0;
      return;
    }

    del = where - CursorH;

    if ((del < -4 || del > 4) && GoodStr(T_ch))
      /* go there directly */
      (void) tputs(tgoto(Str(T_ch), where, where), where, PUTPURE);
    else {
      int i;
      if (del > 0) {          /* moving forward */
          if ((del > 4) && GoodStr(T_RI))
            (void) tputs(tgoto(Str(T_RI), del, del), del, PUTPURE);
          else {
            /* if I can do tabs, use them */
            if (T_Tabs
#ifdef DSPMBYTE
                && !_enable_mbdisp
#endif /* DSPMBYTE */
            ) {
                if ((CursorH & 0370) != (where & 0370)) {
                  /* if not within tab stop */
                  for (i = (CursorH & 0370); i < (where & 0370); i += 8)
                      (void) putraw('\t');      /* then tab over */
                  CursorH = where & 0370;
                  /* Note: considering that we often want to go to
                     TermH - 1 for the wrapping, it would be nice to
                     optimize this case by tabbing to the last column
                     - but this doesn't work for all terminals! */
                }
            }
            /* it's usually cheaper to just write the chars, so we do. */

            /* NOTE THAT so_write() WILL CHANGE CursorH!!! */
            so_write(&Display[CursorV][CursorH], where - CursorH);

          }
      }
      else {                  /* del < 0 := moving backward */
          if ((-del > 4) && GoodStr(T_LE))
            (void) tputs(tgoto(Str(T_LE), -del, -del), -del, PUTPURE);
          else {        /* can't go directly there */
            /* if the "cost" is greater than the "cost" from col 0 */
            if (T_Tabs ? (-del > ((where >> 3) + (where & 07)))
                : (-del > where)) {
                (void) putraw('\r');      /* do a CR */
                CursorH = 0;
                goto mc_again;      /* and try again */
            }
            for (i = 0; i < -del; i++)
                (void) putraw('\b');
          }
      }
    }
    CursorH = where;          /* now where is here */
}

void
so_write(cp, n)
    register Char *cp;
    register int n;
{
    if (n <= 0)
      return;                 /* catch bugs */

    if (n > TermH) {
#ifdef DEBUG_SCREEN
      xprintf("so_write: n is riduculous: %d\r\n", n);
      flush();
#endif /* DEBUG_SCREEN */
      return;
    }

    do {
      if (*cp & LITERAL) {
          extern Char *litptr[];
          Char   *d;

#ifdef DEBUG_LITERAL
          xprintf("so: litnum %d, litptr %x\r\n",
                *cp & CHAR, litptr[*cp & CHAR]);
#endif /* DEBUG_LITERAL */
          for (d = litptr[*cp++ & CHAR]; *d & LITERAL; d++)
            (void) putraw(*d & CHAR);
          (void) putraw(*d);

      }
      else
          (void) putraw(*cp++);
      CursorH++;
    } while (--n);

    if (CursorH >= TermH) { /* wrap? */
      if (T_Margin & MARGIN_AUTO) { /* yes */
          CursorH = 0;
          CursorV++;
          if (T_Margin & MARGIN_MAGIC) {
            /* force the wrap to avoid the "magic" situation */
            Char c;
            if ((c = Display[CursorV][CursorH]) != '\0')
                so_write(&c, 1);
            else
                (void) putraw(' ');
            CursorH = 1;
          }
      }
      else              /* no wrap, but cursor stays on screen */
          CursorH = TermH - 1;
    }
}


void
DeleteChars(num)        /* deletes <num> characters */
    int     num;
{
    if (num <= 0)
      return;

    if (!T_CanDel) {
#ifdef DEBUG_EDIT
      xprintf(CGETS(7, 16, "ERROR: cannot delete\r\n"));
#endif /* DEBUG_EDIT */
      flush();
      return;
    }

    if (num > TermH) {
#ifdef DEBUG_SCREEN
      xprintf(CGETS(7, 17, "DeleteChars: num is riduculous: %d\r\n"), num);
      flush();
#endif /* DEBUG_SCREEN */
      return;
    }

    if (GoodStr(T_DC))        /* if I have multiple delete */
      if ((num > 1) || !GoodStr(T_dc)) {  /* if dc would be more expen. */
          (void) tputs(tgoto(Str(T_DC), num, num), num, PUTPURE);
          return;
      }

    if (GoodStr(T_dm))        /* if I have delete mode */
      (void) tputs(Str(T_dm), 1, PUTPURE);

    if (GoodStr(T_dc))        /* else do one at a time */
      while (num--)
          (void) tputs(Str(T_dc), 1, PUTPURE);

    if (GoodStr(T_ed))        /* if I have delete mode */
      (void) tputs(Str(T_ed), 1, PUTPURE);
}

void
Insert_write(cp, num)         /* Puts terminal in insert character mode, */
    register Char *cp;
    register int num;         /* or inserts num characters in the line */
{
    if (num <= 0)
      return;
    if (!T_CanIns) {
#ifdef DEBUG_EDIT
      xprintf(CGETS(7, 18, "ERROR: cannot insert\r\n"));
#endif /* DEBUG_EDIT */
      flush();
      return;
    }

    if (num > TermH) {
#ifdef DEBUG_SCREEN
      xprintf(CGETS(7, 19, "StartInsert: num is riduculous: %d\r\n"), num);
      flush();
#endif /* DEBUG_SCREEN */
      return;
    }

    if (GoodStr(T_IC))        /* if I have multiple insert */
      if ((num > 1) || !GoodStr(T_ic)) {  /* if ic would be more expen. */
          (void) tputs(tgoto(Str(T_IC), num, num), num, PUTPURE);
          so_write(cp, num);  /* this updates CursorH/V */
          return;
      }

    if (GoodStr(T_im) && GoodStr(T_ei)) { /* if I have insert mode */
      (void) tputs(Str(T_im), 1, PUTPURE);

      CursorH += num;
      do 
          (void) putraw(*cp++);
      while (--num);

      if (GoodStr(T_ip))      /* have to make num chars insert */
          (void) tputs(Str(T_ip), 1, PUTPURE);

      (void) tputs(Str(T_ei), 1, PUTPURE);
      return;
    }

    do {
      if (GoodStr(T_ic))      /* have to make num chars insert */
          (void) tputs(Str(T_ic), 1, PUTPURE);  /* insert a char */

      (void) putraw(*cp++);

      CursorH++;

      if (GoodStr(T_ip))      /* have to make num chars insert */
          (void) tputs(Str(T_ip), 1, PUTPURE);/* pad the inserted char */

    } while (--num);

}

void
ClearEOL(num)                 /* clear to end of line.  There are num */
    int     num;        /* characters to clear */
{
    register int i;

    if (num <= 0)
      return;

    if (T_CanCEOL && GoodStr(T_ce))
      (void) tputs(Str(T_ce), 1, PUTPURE);
    else {
      for (i = 0; i < num; i++)
          (void) putraw(' ');
      CursorH += num;         /* have written num spaces */
    }
}

void
ClearScreen()
{                       /* clear the whole screen and home */
    if (GoodStr(T_cl))
      /* send the clear screen code */
      (void) tputs(Str(T_cl), Val(T_li), PUTPURE);
    else if (GoodStr(T_ho) && GoodStr(T_cd)) {
      (void) tputs(Str(T_ho), Val(T_li), PUTPURE);    /* home */
      /* clear to bottom of screen */
      (void) tputs(Str(T_cd), Val(T_li), PUTPURE);
    }
    else {
      (void) putraw('\r');
      (void) putraw('\n');
    }
}

void
SoundBeep()
{                       /* produce a sound */
    beep_cmd ();
    if (adrof(STRnobeep))
      return;

    if (GoodStr(T_vb) && adrof(STRvisiblebell))
      (void) tputs(Str(T_vb), 1, PUTPURE);      /* visible bell */
    else if (GoodStr(T_bl))
      /* what termcap says we should use */
      (void) tputs(Str(T_bl), 1, PUTPURE);
    else
      (void) putraw(CTL_ESC('\007'));     /* an ASCII bell; ^G */
}

void
ClearToBottom()
{                       /* clear to the bottom of the screen */
    if (GoodStr(T_cd))
      (void) tputs(Str(T_cd), Val(T_li), PUTPURE);
    else if (GoodStr(T_ce))
      (void) tputs(Str(T_ce), Val(T_li), PUTPURE);
}

void
GetTermCaps()
{                       /* read in the needed terminal capabilites */
    register int i;
    char   *ptr;
    char    buf[TC_BUFSIZE];
    static char bp[TC_BUFSIZE];
    char   *area;
    struct termcapstr *t;


#ifdef SIG_WINDOW
# ifdef BSDSIGS
    sigmask_t omask;
# endif /* BSDSIGS */
    int     lins, cols;

    /* don't want to confuse things here */
# ifdef BSDSIGS
    omask = sigblock(sigmask(SIG_WINDOW)) & ~sigmask(SIG_WINDOW);
# else /* BSDSIGS */
    (void) sighold(SIG_WINDOW);
# endif /* BSDSIGS */
#endif /* SIG_WINDOW */
    area = buf;

    GotTermCaps = 1;

    setname("gettermcaps");
    ptr = getenv("TERM");

#ifdef apollo
    /* 
     * If we are on a pad, we pretend that we are dumb. Otherwise the termcap
     * library will put us in a weird screen mode, thinking that we are going
     * to use curses
     */
    if (isapad())
      ptr = "dumb";
#endif /* apollo */

    if (!ptr || !ptr[0] || !strcmp(ptr, "wm") || !strcmp(ptr,"dmx"))
      ptr = "dumb";

    setzero(bp, TC_BUFSIZE);

    i = tgetent(bp, ptr);
    if (i <= 0) {
      if (i == -1) {
#if (SYSVREL == 0) || defined(IRIS3D)
          xprintf(CGETS(7, 20, "%s: Cannot open /etc/termcap.\n"), progname);
      }
      else if (i == 0) {
#endif /* SYSVREL */
          xprintf(CGETS(7, 21,
                    "%s: No entry for terminal type \"%s\"\n"), progname,
                getenv("TERM"));
      }
      xprintf(CGETS(7, 22, "%s: using dumb terminal settings.\n"), progname);
      Val(T_co) = 80;         /* do a dumb terminal */
      Val(T_pt) = Val(T_km) = Val(T_li) = 0;
      for (t = tstr; t->name != NULL; t++)
          TCalloc(t, NULL);
    }
    else {
      /* Can we tab */
      Val(T_pt) = tgetflag("pt") && !tgetflag("xt");
      /* do we have a meta? */
      Val(T_km) = (tgetflag("km") || tgetflag("MT"));
      Val(T_am) = tgetflag("am");
      Val(T_xn) = tgetflag("xn");
      Val(T_co) = tgetnum("co");
      Val(T_li) = tgetnum("li");
      for (t = tstr; t->name != NULL; t++)
          TCalloc(t, tgetstr(t->name, &area));
    }
    if (Val(T_co) < 2)
      Val(T_co) = 80;         /* just in case */
    if (Val(T_li) < 1)
      Val(T_li) = 24;

    T_Cols = (Char) Val(T_co);
    T_Lines = (Char) Val(T_li);
    if (T_Tabs)
      T_Tabs = (Char) Val(T_pt);
    T_HasMeta = (Char) Val(T_km);
    T_Margin = (Char) Val(T_am) ? MARGIN_AUTO : 0;
    T_Margin |= (Char) Val(T_xn) ? MARGIN_MAGIC : 0;
    T_CanCEOL = GoodStr(T_ce);
    T_CanDel = GoodStr(T_dc) || GoodStr(T_DC);
    T_CanIns = GoodStr(T_im) || GoodStr(T_ic) || GoodStr(T_IC);
    T_CanUP = GoodStr(T_up) || GoodStr(T_UP);
    if (GoodStr(T_me) && GoodStr(T_ue))
      me_all = (strcmp(Str(T_me), Str(T_ue)) == 0);
    else
      me_all = 0;
    if (GoodStr(T_me) && GoodStr(T_se))
      me_all |= (strcmp(Str(T_me), Str(T_se)) == 0);


#ifdef DEBUG_SCREEN
    if (!T_CanUP) {
      xprintf(CGETS(7, 23, "%s: WARNING: Your terminal cannot move up.\n",
            progname));
      xprintf(CGETS(7, 24, "Editing may be odd for long lines.\n"));
    }
    if (!T_CanCEOL)
      xprintf(CGETS(7, 25, "no clear EOL capability.\n"));
    if (!T_CanDel)
      xprintf(CGETS(7, 26, "no delete char capability.\n"));
    if (!T_CanIns)
      xprintf(CGETS(7, 27, "no insert char capability.\n"));
#endif /* DEBUG_SCREEN */



#ifdef SIG_WINDOW
    (void) GetSize(&lins, &cols);   /* get the correct window size */
    ChangeSize(lins, cols);

# ifdef BSDSIGS
    (void) sigsetmask(omask); /* can change it again */
# else /* BSDSIGS */
    (void) sigrelse(SIG_WINDOW);
# endif /* BSDSIGS */
#else /* SIG_WINDOW */
    ChangeSize(Val(T_li), Val(T_co));
#endif /* SIG_WINDOW */

    BindArrowKeys();
}

#ifdef SIG_WINDOW
/* GetSize():
 *    Return the new window size in lines and cols, and
 *    true if the size was changed. This can fail if SHIN
 *    is not a tty, but it will work in most cases.
 */
int
GetSize(lins, cols)
    int    *lins, *cols;
{
    *cols = Val(T_co);
    *lins = Val(T_li);

#ifdef TIOCGWINSZ
# define KNOWsize
# ifndef lint
    {
      struct winsize ws;      /* from 4.3 */

      if (ioctl(SHIN, TIOCGWINSZ, (ioctl_t) &ws) != -1) {
          if (ws.ws_col)
            *cols = ws.ws_col;
          if (ws.ws_row)
            *lins = ws.ws_row;
      }
    }
# endif /* !lint */
#else /* TIOCGWINSZ */
# ifdef TIOCGSIZE
#  define KNOWsize
    {
      struct ttysize ts;      /* from Sun */

      if (ioctl(SHIN, TIOCGSIZE, (ioctl_t) &ts) != -1) {
          if (ts.ts_cols)
            *cols = ts.ts_cols;
          if (ts.ts_lines)
            *lins = ts.ts_lines;
      }
    }
# endif /* TIOCGSIZE */
#endif /* TIOCGWINSZ */

    return (Val(T_co) != *cols || Val(T_li) != *lins);
}

#endif /* SIGWINDOW */

void
ChangeSize(lins, cols)
    int     lins, cols;
{
    /*
     * Just in case
     */
    Val(T_co) = (cols < 2) ? 80 : cols;
    Val(T_li) = (lins < 1) ? 24 : lins;

#ifdef KNOWsize
    /*
     * We want to affect the environment only when we have a valid
     * setup, not when we get bad settings. Consider the following scenario:
     * We just logged in, and we have not initialized the editor yet.
     * We reset termcap with tset, and not $TERMCAP has the right
     * terminal size. But since the editor is not initialized yet, and
     * the kernel's notion of the terminal size might be wrong we arrive
     * here with lines = columns = 0. If we reset the environment we lose
     * our only chance to get the window size right.
     */
    if (Val(T_co) == cols && Val(T_li) == lins) {
      Char    buf[10];
      char   *tptr;

      if (getenv("COLUMNS")) {
          (void) Itoa(Val(T_co), buf, 0, 0);
          tsetenv(STRCOLUMNS, buf);
      }

      if (getenv("LINES")) {
          (void) Itoa(Val(T_li), buf, 0, 0);
          tsetenv(STRLINES, buf);
      }

      if ((tptr = getenv("TERMCAP")) != NULL) {
          /* Leave 64 characters slop in case we enlarge the termcap string */
          Char    termcap[1024+64], backup[1024+64], *ptr;
          int     i;

          ptr = str2short(tptr);
          (void) Strncpy(termcap, ptr, 1024);
          termcap[1023] = '\0';

          /* update termcap string; first do columns */
          buf[0] = 'c';
          buf[1] = 'o';
          buf[2] = '#';
          buf[3] = '\0';
          if ((ptr = Strstr(termcap, buf)) == NULL) {
            (void) Strcpy(backup, termcap);
          }
          else {
            i = (int) (ptr - termcap + Strlen(buf));
            (void) Strncpy(backup, termcap, (size_t) i);
            backup[i] = '\0';
            (void) Itoa(Val(T_co), buf, 0, 0);
            (void) Strcat(backup + i, buf);
            ptr = Strchr(ptr, ':');
            (void) Strcat(backup, ptr);
          }

          /* now do lines */
          buf[0] = 'l';
          buf[1] = 'i';
          buf[2] = '#';
          buf[3] = '\0';
          if ((ptr = Strstr(backup, buf)) == NULL) {
            (void) Strcpy(termcap, backup);
          }
          else {
            i = (int) (ptr - backup + Strlen(buf));
            (void) Strncpy(termcap, backup, (size_t) i);
            termcap[i] = '\0';
            (void) Itoa(Val(T_li), buf, 0, 0);
            (void) Strcat(termcap, buf);
            ptr = Strchr(ptr, ':');
            (void) Strcat(termcap, ptr);
          }
          /*
           * Chop the termcap string at 1024 characters to avoid core-dumps
           * in the termcap routines
           */
          termcap[1023] = '\0';
          tsetenv(STRTERMCAP, termcap);
      }
    }
#endif /* KNOWsize */

    ReBufferDisplay();        /* re-make display buffers */
    ClearDisp();
}

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