Source Code 1992 March/Source_Code_CD-ROM_Walnut_Creek_March_1992.iso/usenet/altsrcs/3/3472

Internet Message Format | 1991-06-08 | 49.0 KB

From: [e-mail] (Guido van Rossum)
Newsgroups: alt.sources
Subject: STDWIN 0.9.6 patches, part 5/5
Message-ID: <[e-mail]>
Date: 7 Jun 91 13:32:10 GMT

Archive-name: stdwin0.9.6/patch5

#! /bin/sh
# This is a shell archive.  Remove anything before this line, then unpack
# it by saving it into a file and typing "sh file".  To overwrite existing
# files, type "sh file -c".  You can also feed this as standard input via
# unshar, or by typing "sh <file", e.g..  If this archive is complete, you
# will see the following message at the end:
#        "End of shell archive."
# Contents:  stdwin/Ports/vtrm/vtrm.c
# Wrapped by [e-mail] on Fri Jun  7 15:21:41 1991
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test -f 'stdwin/Ports/vtrm/vtrm.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'stdwin/Ports/vtrm/vtrm.c'\"
else
echo shar: Extracting \"'stdwin/Ports/vtrm/vtrm.c'\" \(46848 characters\)
sed "s/^X//" >'stdwin/Ports/vtrm/vtrm.c' <<'END_OF_FILE'
X/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1991. */
X
X/*
X * Virtual TeRMinal package.
X * (For a description see at the end of this file.)
X *
X * Big change:
X *    output goes to /dev/tty, in case stdout is redirected to a file.
X *
X * TO DO:
X *    - add interrupt handling (trminterrupt)
X *    - adapt to changed window size when suspended or at SIGWINCH
X *      (unfortunately, the calling module must be changed first --
X *      it is not prepared for the changed window size...)
X */
X
X/* Includes: */
X
X#include "os.h"    /* operating system features and C compiler dependencies */
X#include "vtrm.h"  /* terminal capabilities */
X
X#ifndef HAS_TERMIO
X#include <sgtty.h>
X#else
X#include <termio.h>
X#endif
X
X#ifdef SIGNAL
X#include <signal.h>
X#endif
X
X#ifdef SETJMP
X#include <setjmp.h>
X#endif
X
X#ifdef HAS_SELECT
X#include <sys/time.h>
X#endif
X
X/* Style definitions: */
X
X#define Visible
X#define Hidden static
X#define Procedure
X
Xtypedef int bool;
Xtypedef char *string;
Xtypedef short intlet;
X
X#define Yes ((bool) 1)
X#define No  ((bool) 0)
X
X/* Forward declarations: */
X
Xextern char *malloc();
Xextern char *getenv();
Xextern int tgetent();
Xextern int tgetnum();
Xextern int tgetflag();
Xextern char *tgetstr();
Xextern char *tgoto();
X
XHidden int getttyfp();
XHidden int str0cost();
XHidden int gettermcaps();
XHidden int setttymode();
XHidden Procedure resetttymode();
XHidden int start_trm();
XHidden bool get_pos();
XHidden int put_line();
XHidden Procedure set_mode();
XHidden Procedure get_so_mode();
XHidden Procedure standout();
XHidden Procedure standend();
XHidden Procedure put_str();
XHidden Procedure ins_str();
XHidden Procedure del_str();
XHidden Procedure put_c();
XHidden Procedure clear_lines();
XHidden Procedure clr_to_eol();
XHidden int outchar();
XHidden Procedure set_blanks();
XHidden Procedure scr1up();
XHidden Procedure scr1down();
XHidden Procedure scr2up();
XHidden Procedure scr2down();
XHidden Procedure scr_lines();
XHidden Procedure addlines();
XHidden Procedure dellines();
XHidden Procedure scr3up();
XHidden Procedure lf_scroll();
XHidden Procedure move_lines();
XHidden Procedure trmpushback();
XHidden Procedure subshell();
X
X/* Data definitions: */
X
X#ifdef VTRMTRACE
X#define TRACEFILE "trace.vtrm"
XHidden FILE *vtrmfp= (FILE *) NULL;
X#endif
X
X#define Min(a,b) ((a) <= (b) ? (a) : (b))
X
X/* tty modes */
X
X#ifndef HAS_TERMIO
X
X/* v7/BSD tty control */
XHidden struct sgttyb oldtty, newtty;
X
X#ifdef TIOCSETN
X/* Redefine stty to use TIOCSETN, so type-ahead is not flushed */
X#define stty(fd, bp) VOID ioctl(fd, TIOCSETN, (char *) bp)
X#endif /* TIOCSETN */
X
X#ifdef TIOCSLTC /* BSD -- local special chars, must all be turned off */
XHidden struct ltchars oldltchars;
XHidden struct ltchars newltchars= {-1, -1, -1, -1, -1, -1};
X#endif /* TIOCSLTC */
X
X#ifdef TIOCSETC /* V7 -- standard special chars, some must be turned off too */
XHidden struct tchars oldtchars;
XHidden struct tchars newtchars;
X#endif /* TIOCSETC */
X
X#else /* HAS_TERMIO */
X
X/* AT&T tty control */
XHidden struct termio oldtty, newtty, polltty;
X#define gtty(fd,bp) ioctl(fd, TCGETA, (char *) bp)
X#define stty(fd,bp) VOID ioctl(fd, TCSETAW, (char *) bp)
X
X#endif /* HAS_TERMIO */
X
X/* If you can't lookahead in the system's input queue, and so can't implement
X * trmavail(), you have to enable keyboard interrupts.
X * Otherwise, computations are uninterruptable.
X */
X#ifndef HAS_TERMIO
X#ifndef HAS_SELECT
X#ifdef SIGNAL
X#define CATCHINTR
X#endif
X#endif
X#endif
X
XHidden bool know_ttys = No;
X
X/* visible data for termcap */
Xchar PC;
Xchar *BC;
Xchar *UP;
Xshort ospeed;
X
XHidden FILE *fp= (FILE *) NULL;
X#define Putstr(str)    tputs((str), 1, outchar)
X
X/* termcap terminal capabilities */
X
XHidden int lines;
XHidden int cols;
X
X/*
X * String-valued capabilities are saved in one big array.
X * Extend this only at the end (even though it disturbs the sorting)
X * because otherwise you have to change all macros...
X */
X
X#define par_al_str strcaps[0]    /* parametrized al (AL) */
X#define cap_cm_str strcaps[1]    /* screen-relative cursor motion (CM) */
X#define par_dl_str strcaps[2]    /* parametrized dl (DL) */
X#define al_str strcaps[3]     /* add new blank line */
X#define cd_str strcaps[4]     /* clear to end of display */
X#define ce_str strcaps[5]     /* clear to end of line */
X#define cl_str strcaps[6]     /* cursor home and clear screen */
X#define cm_str strcaps[7]     /* cursor motion */
X#define cp_str strcaps[8]    /* cursor position sense reply; obsolete */
X#define cr_str strcaps[9]     /* carriage return */
X#define cs_str strcaps[10]     /* change scrolling region */
X#define dc_str strcaps[11]     /* delete character */
X#define dl_str strcaps[12]     /* delete line */
X#define dm_str strcaps[13]     /* enter delete mode */
X#define do_str strcaps[14]     /* cursor down one line */
X#define ed_str strcaps[15]     /* end delete mode */
X#define ei_str strcaps[16]     /* end insert mode */
X#define ho_str strcaps[17]    /* cursor home */
X#define ic_str strcaps[18]     /* insert character (if necessary; may pad) */
X#define im_str strcaps[19]     /* enter insert mode */
X#define nd_str strcaps[20]     /* cursor right (non-destructive space) */
X#define nl_str strcaps[21]    /* newline */
X#define se_str strcaps[22]     /* end standout mode */
X#define sf_str strcaps[23]     /* scroll text up (from bottom of region) */
X#define so_str strcaps[24]     /* begin standout mode */
X#define sp_str strcaps[25]    /* sense cursor position; obsolete */
X#define sr_str strcaps[26]     /* scroll text down (from top of region) */
X#define te_str strcaps[27]     /* end termcap */
X#define ti_str strcaps[28]     /* start termcap */
X#define vb_str strcaps[29]     /* visible bell */
X#define ve_str strcaps[30]     /* make cursor visible again */
X#define vi_str strcaps[31]     /* make cursor invisible */
X#define le_str strcaps[32]     /* cursor left */
X#define bc_str strcaps[33]    /* backspace character */
X#define up_str strcaps[34]     /* cursor up */
X#define pc_str strcaps[35]    /* pad character */
X#define ks_str strcaps[36]    /* keypad mode start */
X#define ke_str strcaps[37]    /* keypad mode end */
X#define us_str strcaps[38]    /* start underscore mode */
X#define ue_str strcaps[39]    /* end underscore mode */
X/* Insert new entries here only! Don't forget to change the next line! */
X#define NSTRCAPS 40 /* One more than the last entry's index */
X
XHidden char *strcaps[NSTRCAPS];
XHidden char strcapnames[] =
X"ALCMDLalcdceclcmcpcrcsdcdldmdoedeihoicimndnlsesfsospsrtetivbvevilebcuppckskeusue";
X
X/* Same for Boolean-valued capabilities */
X
X#define has_am flagcaps[0]    /* has automatic margins */
X#define has_da flagcaps[1]    /* display may be retained above screen */
X#define has_db flagcaps[2]    /* display may be retained below screen */
X#define has_in flagcaps[3]    /* not safe to have null chars on the screen */
X#define has_mi flagcaps[4]    /* move safely in insert (and delete?) mode */
X#define has_ms flagcaps[5]    /* move safely in standout mode */
X#define has_xs flagcaps[6]    /* standout not erased by overwriting */
X#define has_bs flagcaps[7]    /* terminal can backspace */
X#define hardcopy flagcaps[8]    /* hardcopy terminal */
X#define has_xn flagcaps[9]    /* Vt100 / Concept glitch */
X#define NFLAGS 10
X
XHidden char flagcaps[NFLAGS];
XHidden char flagnames[]= "amdadbinmimsxsbshcxn";
X
XHidden Procedure getcaps(parea)
X     register char **parea;
X{
X    register char *capname;
X    register char **capvar;
X    register char *flagvar;
X
X    for (capname= flagnames, flagvar= flagcaps;
X            *capname != '\0'; capname += 2, ++flagvar)
X        *flagvar= tgetflag(capname);
X
X    for (capname= strcapnames, capvar= strcaps;
X            *capname != '\0'; capname += 2, ++capvar)
X        *capvar= tgetstr(capname, parea);
X}
X
X/* terminal status */
X
X/* calling order of Visible Procs */
XHidden bool started = No;
X
X/* to exports the capabilities mentioned in vtrm.h: */
XHidden int flags = 0;
X
X/* cost for impossible operations */
X#define Infinity 9999
X    /* Allow for adding Infinity+Infinity within range */
X    /* (Range is assumed at least 2**15 - 1) */
X
X/* The following for all sorts of undefined things (except for UNKNOWN char) */
X#define Undefined (-1)
X
X/* current mode of putting char's */
X#define Normal    0
X#define Insert    1
X#define    Delete    2
XHidden short mode = Normal;
X
X/* masks for char's */
X#define NULCHAR    '\000'
X#define UNKNOWN    1
X#define SOBIT    1
X/* if (has_xs) record cookies placed on screen in extra bit */
X/* type of cookie is determined by the SO bit */
X#define XSBIT    2
X#define SOCOOK    3
X#define SECOOK    2
X#define COOKBITS SOCOOK
X#define NOCOOK    0
X
X/* current standout mode */
X#define Off    0
X#define On    SOBIT
XHidden short so_mode = Off;
X
X/* current cursor position */
XHidden short cur_y = Undefined, cur_x = Undefined;
X
X/* "linedata[y][x]" holds the char on the terminal;
X * "linemode[y][x]" holds the SOBIT and XSBIT.
X * the SOBIT tells whether the character is standing out, the XSBIT whether
X * there is a cookie on the screen at this position.
X * In particular a standend-cookie may be recorded AFTER the line
X * (just in case some trmputdata will write after that position).
X * "lenline[y]" holds the length of the line.
X * Unknown chars will be 1, so the optimising compare in putline will fail.
X * (Partially) empty lines are distinghuished by "lenline[y] < cols".
X */
XHidden char **linedata = NULL, **linemode = NULL;
XHidden intlet *lenline = NULL;
X
X/* To compare the mode part of the line when the
X * mode parameter of trmputdata == NULL, we use the following:
X */
XHidden char plain[1]= {PLAIN};
X
X/* Clear the screen initially iff only memory cursor addressing available */
XHidden bool mustclear = No;
X
X/* Make the cursor invisible when trmsync() tries to move outside the screen */
XHidden bool no_cursor = No;
X
X/* Optimise cursor motion */
XHidden int abs_cost;         /* cost of absolute cursor motion */
XHidden int cr_cost;         /* cost of carriage return */
XHidden int do_cost;         /* cost of down */
XHidden int le_cost;         /* cost of left */
XHidden int nd_cost;         /* cost of right */
XHidden int up_cost;         /* cost of up */
X
X/* Optimise trailing match in put_line, iff the terminal can insert and delete
X * characters; the cost per n characters will be:
X *     n * MultiplyFactor + OverHead
X */
XHidden int ins_mf, ins_oh, del_mf, del_oh;
XHidden int ed_cost, ei_cost;         /* used in move() */
X
X/* The type of scrolling possible determines which routines get used;
X * these may be:
X * (1) with addline and deleteline (termcap: al_str & dl_str);
X * (2) with a settable scrolling region, like VT100 (cs_str, sr_str, sf_str);
X * (3) no hardware scrolling available.
X */
XHidden Procedure (*scr_up)();
XHidden Procedure (*scr_down)();
XHidden bool canscroll= Yes;
X
X/*
X * Starting, Ending and (fatal) Error.
X */
X
X/*
X * Initialization call.
X * Determine terminal capabilities from termcap.
X * Set up tty modes.
X * Start up terminal and internal administration.
X * Return 0 if all well, error code if in trouble.
X */
XVisible int trmstart(plines, pcols, pflags)
X     int *plines;
X     int *pcols;
X     int *pflags;
X{
X    register int err;
X
X#ifdef VTRMTRACE
X    if (!started) vtrmfp= fopen(TRACEFILE, vtrmfp ? "a" : "w");
X    if (vtrmfp) fprintf(vtrmfp, "\ttrmstart(&li, &co, &fl);\n");
X#endif
X    if (started)
X        return TE_TWICE;
X    err= getttyfp();
X    if (err != TE_OK)
X        return err;
X    err= gettermcaps();
X    if (err != TE_OK)
X        return err;
X    err= setttymode();
X    if (err != TE_OK)
X        return err;
X    err= start_trm();
X    if (err != TE_OK) {
X        trmend();
X        return err;
X    }
X
X    *plines = lines;
X    *pcols = cols;
X    *pflags = flags;
X
X    started = Yes;
X
X    trmsync(lines-1, 0);   /* position to end of screen */
X
X    return TE_OK;
X}
X
X/*
X * Termination call.
X * Reset tty modes, etc.
X * Beware that it might be called by a caught interrupt even in the middle
X * of trmstart()!
X */
XVisible Procedure trmend()
X{
X#ifdef VTRMTRACE
X    if (vtrmfp) fprintf(vtrmfp, "\ttrmend();\n");
X#endif
X    set_mode(Normal);
X    if (so_mode != Off)
X        standend();
X    Putstr(ke_str);
X    Putstr(te_str);
X    VOID fflush(fp);
X    resetttymode();
X
X    started = No;
X#ifdef VTRMTRACE
X    if (vtrmfp) fclose(vtrmfp);
X#endif
X}
X
X/*
X * Set all internal statuses to undefined, especially the contents of
X * the screen, so a hard redraw will not be optimised to heaven.
X */
XVisible Procedure trmundefined()
X{
X    register int y, x;
X#ifdef VTRMTRACE
X    if (vtrmfp) fprintf(vtrmfp, "\ttrmundefined();\n");
X#endif
X
X    cur_y = cur_x = Undefined;
X    mode = so_mode = Undefined;
X
X    for (y = 0; y < lines; y++) {
X        for (x = 0; x <= cols; x++) {
X            linedata[y][x] = UNKNOWN; /* impossible char */
X            linemode[y][x] = NOCOOK;  /* no so bits */
X        }
X        lenline[y] = cols;
X    }
X}
X
X#ifdef VTRMTRACE
X
X/*ARGSUSED*/
XHidden Procedure check_started(m)
X     char *m;
X{
X    if (!started) {
X        trmend();
X        if (vtrmfp) fprintf(vtrmfp, "bad VTRM call\n");
X        abort();
X    }
X}
X
X#else
X
X#define check_started(m) /*empty*/
X
X#endif /* VTRMTRACE */
X
XHidden int getttyfp()
X{
X    if (fp != NULL)    /* already initialised */
X        return TE_OK;
X    fp= fopen("/dev/tty", "w");
X    if (fp == NULL)
X        return TE_NOTTY;
X    return TE_OK;
X}
X
XHidden int ccc;
X
X/*ARGSUSED*/
XHidden Procedure countchar(ch)
X     char ch;
X{
X    ccc++;
X}
X
XHidden int strcost(str)
X     char *str;
X{
X    if (str == NULL)
X        return Infinity;
X    return str0cost(str);
X}
X
XHidden int str0cost(str)
X     char *str;
X{
X    ccc = 0;
X    tputs(str, 1, countchar);
X    return ccc;
X}
X
X/*
X * Get terminal capabilities from termcap and compute related static
X * properties.  Return TE_OK if all well, error code otherwise.
X */
X
XHidden int gettermcaps()
X{
X    string trmname;
X    char tc_buf[1024];
X    static char strbuf[1024];
X    char *area = strbuf;
X    int sg;
X    static bool tc_initialized = No;
X
X    if (tc_initialized)
X        return TE_OK;
X
X    trmname=getenv("TERM");
X    if (trmname == NULL || trmname[0] == '\0')
X        return TE_NOTERM;
X    if (tgetent(tc_buf, trmname) != 1)
X        return TE_BADTERM;
X
X    getcaps(&area); /* Read all flag and string type capabilities */
X    if (hardcopy)
X        return TE_DUMB;
X    BC = le_str;
X    if (BC == NULL) {
X        BC = bc_str;
X        if (BC == NULL) {
X            if (has_bs)
X                BC = "\b";
X            else
X                return TE_DUMB;
X        }
X    }
X    UP = up_str;
X    if (UP == NULL)
X        return TE_DUMB;
X    PC = (pc_str != NULL? pc_str[0] : NULCHAR);
X
X    if (cm_str == NULL) {
X        cm_str = cap_cm_str;
X        if (cm_str == NULL) {
X            if (ho_str == NULL || do_str == NULL || nd_str == NULL)
X                return TE_DUMB;
X        }
X        else
X            mustclear = Yes;
X    }
X    if (al_str && dl_str) {
X        scr_up = scr1up;
X        scr_down = scr1down;
X        flags |= CAN_SCROLL;
X    }
X    else {
X        if (sf_str == NULL)
X            sf_str = "\n";
X        if (cs_str && sr_str) {
X            scr_up = scr2up;
X            scr_down = scr2down;
X            flags |= CAN_SCROLL;
X        }
X        else {
X            canscroll= No;
X        }
X    }
X
X    lines = tgetnum("li");
X    cols = tgetnum("co");
X    if (lines <= 0) lines = 24;
X    if (cols <= 0) cols = 80;
X
X    if (!ce_str)
X        return TE_DUMB;
X    if (cr_str == NULL) cr_str = "\r";
X    if (do_str == NULL) {
X        do_str = nl_str;
X        if (do_str == NULL) do_str = "\n";
X    }
X    le_str = BC;
X    up_str = UP;
X    if (vb_str == NULL)     /* then we will do with the audible bell */
X        vb_str = "\007";
X
X    if (so_str != NULL && se_str != NULL && (sg=tgetnum("sg")) <= 0) {
X        if (sg == 0)
X            has_xs = Yes;
X        flags |= HAS_STANDOUT;
X    }
X    else if (us_str != NULL && ue_str != NULL) {
X        so_str = us_str; se_str = ue_str;
X        flags |= HAS_STANDOUT;
X    }
X    else
X        return TE_DUMB;
X
X    /* calculate costs of local and absolute cursor motions */
X    if (cm_str == NULL)
X        abs_cost = Infinity;
X    else
X        abs_cost = strcost(tgoto(cm_str, 0, 0));
X    cr_cost = strcost(cr_str);
X    do_cost = strcost(do_str);
X    le_cost = strcost(le_str);
X    nd_cost = strcost(nd_str);
X    up_cost = strcost(up_str);
X
X    /* cost of leaving insert or delete mode, used in move() */
X    ei_cost = str0cost(ei_str);
X    ed_cost = str0cost(ed_str);
X
X    /* calculate insert and delete cost multiply_factor and overhead */
X    if (((im_str && ei_str) || ic_str) && dc_str) {
X        flags |= CAN_OPTIMISE;
X        ins_mf = 1 + str0cost(ic_str);
X        ins_oh = str0cost(im_str) + ei_cost;
X        del_mf = str0cost(dc_str);
X        del_oh = str0cost(dm_str) + ed_cost;
X    }
X
X    tc_initialized = Yes;
X    return TE_OK;
X}
X
X#ifdef CATCHINTR
X
XHidden char intrchar;
XHidden bool trmintrptd = No;
XHidden bool readintrcontext = No;
X#ifdef SETJMP
XHidden jmp_buf readinterrupt;
X#endif
X
XHidden SIGTYPE trmintrhandler(sig)
X     int sig;
X{
X    VOID signal(SIGINT, trmintrhandler);
X    trmintrptd = Yes;
X#ifdef SETJMP
X    if (readintrcontext) longjmp(readinterrupt, 1);
X#endif
X}
X
X#endif /* CATCHINTR */
X
XHidden int setttymode()
X{
X    if (!know_ttys) {
X        if (gtty(0, &oldtty) != 0
X            || gtty(0, &newtty) != 0
X#ifdef HAS_TERMIO
X            || gtty(0, &polltty) != 0
X#endif
X            )
X            return TE_NOTTY;
X#ifndef HAS_TERMIO
X        ospeed = oldtty.sg_ospeed;
X        newtty.sg_flags = (newtty.sg_flags & ~ECHO & ~CRMOD & ~XTABS)
X                  | CBREAK;
X#ifdef TIOCSLTC
X        VOID ioctl(0, TIOCGLTC, (char *) &oldltchars);
X#endif
X#ifdef TIOCSETC
X        VOID ioctl(0, TIOCGETC, (char *) &oldtchars);
X#endif
X
X#else /* HAS_TERMIO */
X        ospeed= oldtty.c_lflag & CBAUD;
X        newtty.c_iflag &= ~ICRNL; /* No CR->NL mapping on input */
X        newtty.c_oflag &= ~ONLCR; /* NL doesn't output CR */
X        newtty.c_lflag &= ~(ICANON|ECHO|ISIG);
X                /* No line editing, no echo,
X                 * no quit, intr or susp signals */
X        newtty.c_cc[VMIN]= 3; /* wait for 3 characters */
X        newtty.c_cc[VTIME]= 1; /* or 0.1 sec. */
X
X        polltty.c_iflag= newtty.c_iflag;
X        polltty.c_oflag= newtty.c_oflag;
X        polltty.c_lflag= newtty.c_lflag;
X        polltty.c_cc[VQUIT]= newtty.c_cc[VQUIT];
X#ifdef VSUSP
X        polltty.c_cc[VSUSP]= newtty.c_cc[VSUSP];
X#endif
X        polltty.c_cc[VMIN]= 0;  /* don't block read() */
X        polltty.c_cc[VTIME]= 0; /* just give 'em chars iff available */
X#endif /* HAS_TERMIO */
X        know_ttys = Yes;
X    }
X    stty(0, &newtty);
X#ifndef HAS_TERMIO
X#ifdef TIOCSLTC
X    VOID ioctl(0, TIOCSLTC, (char *) &newltchars);
X#endif
X#ifdef TIOCSETC
X    VOID ioctl(0, TIOCGETC, (char *) &newtchars);
X#ifndef CATCHINTR
X    newtchars.t_intrc= -1;
X#else
X    intrchar= oldtchars.t_intrc;
X    newtchars.t_intrc= intrchar;   /* do not disable interupt */
X    signal(SIGINT, trmintrhandler);/* but catch it */
X#endif /* CATCHINTR */
X    newtchars.t_quitc= -1;
X    newtchars.t_eofc= -1;
X    newtchars.t_brkc= -1;
X    VOID ioctl(0, TIOCSETC, (char *) &newtchars);
X#endif /* TIOCSETC */
X#endif /* !HAS_TERMIO */
X    return TE_OK;
X}
X
XHidden Procedure resetttymode()
X{
X    if (know_ttys) {
X        stty(0, &oldtty);
X#ifndef HAS_TERMIO
X#ifdef TIOCSLTC
X        VOID ioctl(0, TIOCSLTC, (char *) &oldltchars);
X#endif
X#ifdef TIOCSETC
X        VOID ioctl(0, TIOCSETC, (char *) &oldtchars);
X#endif
X#endif /* !HAS_TERMIO */
X        know_ttys= No;
X    }
X}
X
XHidden int start_trm()
X{
X    register int y;
X#ifdef TIOCGWINSZ
X    struct winsize win;
X
X    if (ioctl(0, TIOCGWINSZ, (char*)&win) == 0) {
X        if (win.ws_col > 0 && ((int) win.ws_col) != cols
X            ||
X            win.ws_row > 0 && ((int) win.ws_row) != lines) {
X            /* Window size has changed.
X               Release previously allocated buffers. */
X            if (linedata != NULL) {
X                for (y= 0; y < lines; ++y) {
X                    free((char *) linedata[y]);
X                }
X                free((char *) linedata);
X                linedata= NULL;
X            }
X            if (linemode != NULL) {
X                for (y= 0; y < lines; ++y) {
X                    free((char *) linemode[y]);
X                }
X                free((char *) linemode);
X                linemode= NULL;
X            }
X            if (lenline != NULL) {
X                free((char *) lenline);
X                lenline= NULL;
X            }
X        }
X        if (((int)win.ws_col) > 0)
X            cols = win.ws_col;
X        if (((int)win.ws_row) > 0)
X            lines = win.ws_row;
X    }
X#endif
X    if (linedata == NULL) {
X        if ((linedata = (char**) malloc(lines * sizeof(char*))) == NULL)
X            return TE_NOMEM;
X        for (y = 0; y < lines; y++) {
X            if ((linedata[y] = (char*) malloc((cols+1) * sizeof(char))) == NULL)
X                return TE_NOMEM;
X        }
X    }
X    if (linemode == NULL) {
X        if ((linemode = (char**) malloc(lines * sizeof(char*))) == NULL)
X            return TE_NOMEM;
X        for (y = 0; y < lines; y++) {
X            if ((linemode[y] = (char*) malloc((cols+1) * sizeof(char))) == NULL)
X                return TE_NOMEM;
X        }
X    }
X    if (lenline == NULL) {
X        if ((lenline = (intlet*) malloc(lines * sizeof(intlet))) == NULL)
X            return TE_NOMEM;
X    }
X
X    trmundefined();
X
X    Putstr(ti_str);
X    Putstr(ks_str);
X    if (cs_str)
X        Putstr(tgoto(cs_str, lines-1, 0));
X    if (mustclear)
X        clear_lines(0, lines-1);
X    VOID fflush(fp);
X
X    return TE_OK;
X}
X
X
X/*
X * Sensing and moving the cursor.
X */
X
X/*
X * Sense the current (y, x) cursor position.
X * On terminals with local cursor motion, the first argument must be the
X * string that must be sent to the terminal to ask for the current cursor
X * position after a possible manual change by the user;
X * the format describes the answer as a parameterized string
X * a la termcap(5).
X * If the terminal cannot be asked for the current cursor position,
X * or if the string returned by the terminal is garbled,
X * the position is made Undefined.
X * This scheme can also be used for mouse clicks, if these can be made to
X * send the cursor position; the sense string can normally be empty.
X */
X
XVisible Procedure trmsense(sense, format, py, px)
X     string sense;
X     string format;
X     int *py;
X     int *px;
X{
X#ifdef VTRMTRACE
X    if (vtrmfp) fprintf(vtrmfp, "\ttrmsense(&yy, &xx);\n");
X#endif
X    check_started("trmsense");
X
X    if (sense != NULL)
X        Putstr(sense);
X    VOID fflush(fp);
X
X    *py = *px = Undefined;
X    set_mode(Normal);
X    if (so_mode != Off)
X        standend();
X
X    if (format != NULL && get_pos(format, py, px)) {
X        if (*py < 0 || lines <= *py || *px < 0 || cols <= *px)
X            *py = *px = Undefined;
X    }
X    cur_y = Undefined;
X    cur_x = Undefined;
X}
X
XHidden bool get_pos(format, py, px)
X     string format;
X     int *py;
X     int *px;
X{
X    int fc;         /* current format character */
X    int ic;         /* current input character */
X    int num;
X    int on_y = 1;
X    bool incr_orig = No;
X    int i, ni;
X
X    while (fc = *format++) {
X        if (fc != '%') {
X            if (trminput() != fc)
X                return No;
X        }
X        else {
X            switch (fc = *format++) {
X            case '%':
X                if (trminput() != '%')
X                    return No;
X                continue;
X            case '.':
X                VOID trminput(); /* skip one char */
X                continue;
X            case 'r':
X                on_y = 1 - on_y;
X                continue;
X            case 'i':
X                incr_orig = Yes;
X                continue;
X            case 'd':
X                ic = trminput();
X                if (!isdigit(ic))
X                    return No;
X                num = ic - '0';
X                while (isdigit(ic=trminput()))
X                    num = 10*num + ic - '0';
X                trmpushback(ic);
X                break;
X            case '2':
X            case '3':
X                ni = fc - '0';
X                    num = 0;
X                for (i=0; i<ni; i++) {
X                    ic = trminput();
X                    if (isdigit(ic))
X                        num = 10*num + ic - '0';
X                    else
X                        return No;
X                }
X                break;
X            case '+':
X                num = trminput() - *format++;
X                break;
X            case '-':
X                num = trminput() + *format++;
X                break;
X            default:
X                return No;
X            }
X            /* assign num to parameter */
X            if (incr_orig)
X                num--;
X            if (on_y)
X                *py = num;
X            else
X                *px = num;
X            on_y = 1 - on_y;
X        }
X    }
X
X    return Yes;
X}
X
X/*
X * To move over characters by rewriting them, we have to check:
X * (1) that the screen has been initialised on these positions;
X * (2) we do not screw up characters or so_mode
X * when rewriting linedata[y] from x_from upto x_to
X */
XHidden bool rewrite_ok(y, xfrom, xto)
X     int y;
X     int xfrom;
X     int xto;
X{
X    register char *plnyx, *pmdyx, *plnyto;
X
X    if (xto > lenline[y])
X        return No;
X
X    plnyto = &linedata[y][xto];
X    plnyx = &linedata[y][xfrom];
X    pmdyx = &linemode[y][xfrom];
X    while (plnyx <= plnyto) {
X        if (*plnyx == UNKNOWN
X            ||
X            (!has_xs && (*pmdyx != so_mode))
X           )
X            return No;
X        plnyx++, pmdyx++;
X    }
X    return Yes;
X}
X
X/*
X * Move to position y,x on the screen
X */
X/* possible move types for y and x respectively: */
X#define None    0
X#define Down    1
X#define Up    2
X#define Right    1
X#define ReWrite    2
X#define Left    3
X#define CrWrite    4
X
XHidden Procedure move(y, x)
X     int y;
X     int x;
X{
X    int dy, dx;
X    int y_cost, x_cost, y_move, x_move;
X    int mode_cost;
X    int xi;
X
X    if (cur_y == y && cur_x == x)
X        return;
X
X    if (!has_mi || mode == Undefined)
X        set_mode(Normal);
X    if (!has_xs && ((!has_ms && so_mode != Off) || so_mode == Undefined))
X        standend();
X
X    if (cur_y == Undefined || cur_x == Undefined)
X        goto absmove;
X
X    dy = y - cur_y;
X    dx = x - cur_x;
X
X    if (dy > 0) {
X        y_move = Down;
X        y_cost = dy * do_cost;
X    }
X    else if (dy < 0) {
X        y_move = Up;
X        y_cost = -dy * up_cost;
X    }
X    else {
X        y_move = None;
X        y_cost = 0;
X    }
X    if (y_cost < abs_cost) {
X        switch (mode) {
X        case Normal:
X            mode_cost = 0;
X            break;
X        case Insert:
X            mode_cost = ei_cost;
X            break;
X        case Delete:
X            mode_cost = ed_cost;
X            break;
X        }
X        if (dx > 0) {
X            x_cost = dx + mode_cost;
X            if (dx*nd_cost < x_cost || !rewrite_ok(y, cur_x, x)) {
X                x_cost = dx * nd_cost;
X                x_move = Right;
X            }
X            else
X                x_move = ReWrite;
X        }
X        else if (dx < 0) {
X            x_cost = -dx * le_cost;
X            x_move = Left;
X        }
X        else {
X            x_cost = 0;
X            x_move = None;
X        }
X        if (cr_cost + x + mode_cost < x_cost && rewrite_ok(y, 0, x)) {
X            x_move = CrWrite;
X            x_cost = cr_cost + x + mode_cost;
X        }
X    }
X    else
X        x_cost = abs_cost;
X
X    if (y_cost + x_cost < abs_cost) {
X        switch (y_move) {
X        case Down:
X            while (dy-- > 0) Putstr(do_str);
X            break;
X        case Up:
X            while (dy++ < 0) Putstr(up_str);
X            break;
X        }
X        switch (x_move) {
X        case Right:
X            while (dx-- > 0) Putstr(nd_str);
X            break;
X        case Left:
X            while (dx++ < 0) Putstr(le_str);
X            break;
X        case CrWrite:
X            Putstr(cr_str);
X            cur_x = 0;
X            /* FALL THROUGH */
X        case ReWrite:
X            set_mode(Normal);
X            for (xi = cur_x; xi < x; xi++)
X                fputc(linedata[y][xi], fp);
X            break;
X        }
X    }
X    else
X    {
X    absmove:
X        if (cm_str == NULL) {
X            Putstr(ho_str);
X            for (cur_y = 0; cur_y < y; ++cur_y)
X                Putstr(do_str);
X            /* Should try to use tabs here: */
X            for (cur_x = 0; cur_x < x; ++cur_x)
X                Putstr(nd_str);
X        }
X        else
X            Putstr(tgoto(cm_str, x, y));
X    }
X
X    cur_y = y;
X    cur_x = x;
X}
X
X
X/*
X * Putting data on the screen.
X */
X
X/*
X * Fill screen area with given "data".
X * Characters for which the corresponding char in "mode" have the value
X * STANDOUT must be put in inverse video.
X */
XVisible Procedure trmputdata(yfirst, ylast, indent, data, mode)
X     int yfirst, ylast;
X     register int indent;
X     register string data;
X     register string mode;
X{
X    register int y;
X    int x, len, lendata, space;
X
X#ifdef VTRMTRACE
X    if (vtrmfp) fprintf(vtrmfp, "\ttrmputdata(%d, %d, %d, \"%s\");\n", yfirst, ylast, indent, data);
X#endif
X    check_started("trmputdata");
X
X    if (yfirst < 0)
X        yfirst = 0;
X    if (ylast >= lines)
X        ylast = lines-1;
X    space = cols*(ylast-yfirst+1) - indent;
X    if (space <= 0)
X        return;
X    yfirst += indent/cols;
X    indent %= cols;
X    y= yfirst;
X    if (!data)
X        data= ""; /* Safety net */
X    x = indent;
X    lendata = strlen(data);
X    if (ylast == lines-1 && lendata >= space)
X        lendata = space - 1;
X    len = Min(lendata, cols-x);
X    while (y <= ylast) {
X        put_line(y, x, data, mode, len);
X        y++;
X        lendata -= len;
X        if (lendata > 0) {
X            x = 0;
X            data += len;
X            if (mode != NULL)
X                mode += len;
X            len = Min(lendata, cols);
X        }
X        else
X            break;
X    }
X    if (y <= ylast)
X        clear_lines(y, ylast);
X}
X
X/*
X * We will first try to get the picture:
X *
X *                  op>>>>>>>>>>>op          oq<<<<<<<<<<<<<<<<<<<<<<<<oq
X *                  ^            ^           ^                         ^
X *           <xskip><-----m1----><----od-----><-----------m2----------->
X *   OLD:   "You're in a maze of twisty little pieces of code, all alike"
X *   NEW:          "in a maze of little twisting pieces of code, all alike"
X *                  <-----m1----><-----nd------><-----------m2----------->
X *                  ^            ^             ^                         ^
X *                  np>>>>>>>>>>>np            nq<<<<<<<<<<<<<<<<<<<<<<<<nq
X * where
X *    op, oq, np, nq are pointers to start and end of Old and New data,
X * and
X *    xskip = length of indent to be skipped,
X *    m1 = length of Matching part at start,
X *    od = length of Differing mid on screen,
X *    nd = length of Differing mid in data to be put,
X *    m2 = length of Matching trail.
X *
X * Then we will try to find a long blank-or-cleared piece in <nd+m2>:
X *
X *    <---m1---><---d1---><---nb---><---d2---><---m2--->
X *              ^         ^         ^        ^         ^
X *              np        bp        bq1      nq        nend
X * where
X *    bp, bq1 are pointers to start and AFTER end of blank piece,
X * and
X *    d1 = length of differing part before blank piece,
X *    nb = length of blank piece to be skipped,
X *    d2 = length of differing part after blank piece.
X * Remarks:
X *    d1 + nb + d2 == nd,
X * and
X *    d2 maybe less than 0.
X */
XHidden int put_line(y, xskip, data, mode, len)
X     int y;
X     int xskip;
X     string data;
X     string mode;
X     int len;
X{
X    register char *op, *oq, *mp;
X    register char *np, *nq, *nend, *mo;
X    char *bp, *bq1, *p, *q;
X    int m1, m2, od, nd, delta, dd, d1, nb, d2;
X    bool skipping;
X    int cost, o_cost;     /* normal and optimising cost */
X
X    /* Bugfix GvR 19-June-87: */
X    while (lenline[y] < xskip) {
X        linedata[y][lenline[y]] = ' ';
X        linemode[y][lenline[y]] = PLAIN;
X        lenline[y]++;
X    }
X
X    /* calculate the magic parameters */
X    op = &linedata[y][xskip];
X    oq = &linedata[y][lenline[y]-1];
X    mp = &linemode[y][xskip];
X    np = data;
X    nq = nend = data + len - 1;
X    mo = (mode != NULL ? mode : plain);
X    m1 = m2 = 0;
X    while (op <= oq && np <= nq && *op == *np && ((*mp)&SOBIT) == *mo) {
X        op++, np++, mp++, m1++;
X        if (mode != NULL) mo++;
X    }
X    /* calculate m2, iff we can optimise or line keeps same length: */
X    if (flags & CAN_OPTIMISE || (oq-op) == (nq-np)) {
X        if (mode != NULL) mo = mode + len - 1;
X        mp = &linemode[y][lenline[y]-1];
X        while (op <= oq && np <= nq
X               && *oq == *nq && ((*mp)&SOBIT) == *mo) {
X            oq--, nq--, mp--, m2++;
X            if (mode != NULL) mo--;
X        }
X    }
X    od = oq - op + 1;
X    nd = nq - np + 1;
X    /* now we have the first picture above */
X
X    if (od==0 && nd==0)
X        return;
X    delta = nd - od;
X
X    /* find the blank piece */
X    p = q = bp = bq1 = np;
X    if (mode != NULL) mo = mode + (np - data);
X    oq += m2;         /* back to current eol */
X    if (delta == 0) /* if no change in linelength */
X        nend -= m2;    /* don't find blanks in m2 */
X    if (!has_in) {
X        mp = &linemode[y][xskip + (op - (&linedata[y][xskip]))];
X        while (p <= nend) {
X            while (q <= nend && *q == ' ' && *mo == PLAIN
X                   && (op > oq
X                   || (*op == ' ' && ((*mp)&SOBIT) == NOCOOK)))
X            {
X                q++, op++, mp++;
X                if (mode != NULL) mo++;
X            }
X            if (q - p > bq1 - bp)
X                bp = p, bq1 = q;
X            p = ++q;
X            if (mode != NULL) mo++;
X            op++, mp++;
X        }
X    }
X    d1 = bp - np;
X    nb = bq1 - bp;
X    d2 = nq - bq1 + 1;
X
X    /* what is cheapest:
X     * ([+m2] means: leave m2 alone if same linelength)
X     *  normal: put nd[+m2];                       (dd = nd[+m2])
X     *  skipping: put d1, skip nb, put d2[+m2];    (dd = d2[+m2])
X     *  optimise: put dd, insert or delete delta.  (dd = min(od,nd))
X     */
X    cost = nd + (delta == 0 ? 0 : m2);     /* normal cost */
X    if (nb > abs_cost || (d1 == 0 && nb > 0)) {
X        skipping = Yes;
X        cost -= nb - (d1>0 ? abs_cost : 0); /* skipping cost */
X        dd = d2;
X    }
X    else {
X        skipping = No;
X        dd = nd;
X    }
X
X    if (m2 != 0 && delta != 0) {
X        /* try optimising */
X        o_cost = Min(od, nd);
X        if (delta > 0)
X            o_cost += delta * ins_mf + ins_oh;
X        else if (delta < 0)
X            o_cost += -delta * del_mf + del_oh;
X        if (o_cost >= cost) {
X            /* discard m2, no optimise */
X            dd += m2;
X            m2 = 0;
X        }
X        else {
X            dd = Min(od, nd);
X            skipping = No;
X        }
X    }
X
X    /* and now for the real work */
X    if (!skipping || d1 > 0)
X        move(y, xskip + m1);
X
X    if (has_xs)
X        get_so_mode();
X
X    if (skipping) {
X        if (d1 > 0) {
X            set_mode(Normal);
X            mo= (mode != NULL ? mode+(np-data) : NULL);
X            put_str(np, mo, d1, No);
X        }
X        if (has_xs && so_mode != Off)
X            standend();
X        set_blanks(y, xskip+m1+d1, xskip+m1+d1+nb);
X        if (dd != 0 || delta < 0) {
X            move(y, xskip+m1+d1+nb);
X            np = bq1;
X        }
X    }
X
X    if (dd > 0) {
X        set_mode(Normal);
X        mo= (mode != NULL ? mode+(np-data) : NULL);
X        put_str(np, mo, dd, No);
X    }
X
X    if (m2 > 0) {
X        if (delta > 0) {
X            set_mode(Insert);
X            mo= (mode != NULL ? mode+(np+dd-data) : NULL);
X            ins_str(np+dd, mo, delta);
X        }
X        else if (delta < 0) {
X            if (so_mode != Off)
X                standend();
X                /* Some terminals fill with standout spaces! */
X            set_mode(Delete);
X            del_str(-delta);
X        }
X    }
X    else {
X        if (delta < 0) {
X            clr_to_eol();
X            return;
X        }
X    }
X
X    lenline[y] = xskip + len;
X    if (cur_x == cols) {
X        if (!has_mi)
X            set_mode(Normal);
X        if (!has_ms)
X            so_mode = Undefined;
X        if (has_am) {
X            if (has_xn)
X                cur_y= Undefined;
X            else
X                cur_y++;
X        }
X        else
X            Putstr(cr_str);
X        cur_x = 0;
X    }
X    else if (has_xs) {
X        if (m2 == 0) {
X            if (so_mode == On)
X                standend();
X        }
X        else {
X            if (!(linemode[cur_y][cur_x] & XSBIT)) {
X                if (so_mode != (linemode[cur_y][cur_x] & SOBIT))
X                    (so_mode ? standend() : standout());
X            }
X        }
X    }
X}
X
XHidden Procedure set_mode(m)
X     int m;
X{
X    if (m == mode)
X        return;
X    switch (mode) {
X    case Insert:
X        Putstr(ei_str);
X        break;
X    case Delete:
X        Putstr(ed_str);
X        break;
X    case Undefined:
X        Putstr(ei_str);
X        Putstr(ed_str);
X        break;
X    }
X    switch (m) {
X    case Insert:
X        Putstr(im_str);
X        break;
X    case Delete:
X        Putstr(dm_str);
X        break;
X    }
X    mode = m;
X}
X
XHidden Procedure get_so_mode()
X{
X    if (cur_x >= lenline[cur_y] || linemode[cur_y][cur_x] == NOCOOK)
X        so_mode = Off;
X    else
X        so_mode = linemode[cur_y][cur_x] & SOBIT;
X}
X
XHidden Procedure standout()
X{
X    Putstr(so_str);
X    so_mode = On;
X    if (has_xs)
X        linemode[cur_y][cur_x] = SOCOOK;
X}
X
XHidden Procedure standend()
X{
X    Putstr(se_str);
X    so_mode = Off;
X    if (has_xs)
X        linemode[cur_y][cur_x] = SECOOK;
X}
X
XHidden Procedure put_str(data, mode, n, inserting)
X     char *data;
X     char *mode;
X     int n;
X     bool inserting;
X{
X    register char ch, mo;
X    register short so;
X    char *ln_y_x, *ln_y_end;
X
X    so = so_mode;
X    if (has_xs) {
X        ln_y_x = &linemode[cur_y][cur_x];
X        ln_y_end = &linemode[cur_y][lenline[cur_y]];
X    }
X    while (n-- > 0) {
X        if (has_xs && ln_y_x <= ln_y_end && ((*ln_y_x)&XSBIT))
X            so = so_mode = (*ln_y_x)&SOBIT;
X            /* this also checks for the standend cookie AFTER */
X            /* the line because off the equals sign in <= */
X        ch= *data++;
X        mo= (mode != NULL ? *mode++ : PLAIN);
X        if (mo != so) {
X            so = mo;
X            so ? standout() : standend();
X        }
X        if (inserting)
X            Putstr(ic_str);
X        put_c(ch, mo);
X        if (has_xs)
X            ln_y_x++;
X    }
X}
X
XHidden Procedure ins_str(data, mode, n)
X     char *data;
X     char *mode;
X     int n;
X{
X    int x;
X
X    /* x will start AFTER the line, because there might be a cookie */
X    for (x = lenline[cur_y]; x >= cur_x; x--) {
X        linedata[cur_y][x+n] = linedata[cur_y][x];
X        linemode[cur_y][x+n] = linemode[cur_y][x];
X    }
X    put_str(data, mode, n, Yes);
X}
X
XHidden Procedure del_str(n)
X     int n;
X{
X    int x, xto;
X
X    xto = lenline[cur_y] - n; /* again one too far because of cookie */
X    if (has_xs) {
X        for (x = cur_x + n; x >= cur_x; x--) {
X            if (linemode[cur_y][x] & XSBIT)
X                break;
X        }
X        if (x >= cur_x)
X            linemode[cur_y][cur_x+n] = linemode[cur_y][x];
X    }
X    for (x = cur_x; x <= xto; x++) {
X        linedata[cur_y][x] = linedata[cur_y][x+n];
X        linemode[cur_y][x] = linemode[cur_y][x+n];
X    }
X    while (n-- > 0)
X        Putstr(dc_str);
X}
X
XHidden Procedure put_c(ch, mo)
X     char ch;
X     char mo;
X{
X    char sobit, xs_flag;
X
X    fputc(ch, fp);
X    sobit = (mo == STANDOUT ? SOBIT : 0);
X    if (has_xs)
X        xs_flag = linemode[cur_y][cur_x]&XSBIT;
X    else
X        xs_flag = 0;
X    linedata[cur_y][cur_x] = ch;
X    linemode[cur_y][cur_x] = sobit|xs_flag;
X    cur_x++;
X}
X
XHidden Procedure clear_lines(yfirst, ylast)
X     int yfirst;
X     int ylast;
X{
X    register int y;
X
X    if (!has_xs && so_mode != Off)
X        standend();
X    if (cl_str && yfirst == 0 && ylast == lines-1) {
X        Putstr(cl_str);
X        cur_y = cur_x = 0;
X        for (y = 0; y < lines; ++y) {
X            lenline[y] = 0;
X            if (has_xs) linemode[y][0] = NOCOOK;
X        }
X        return;
X    }
X    for (y = yfirst; y <= ylast; y++) {
X        if (lenline[y] > 0) {
X            move(y, 0);
X            if (ylast == lines-1 && cd_str) {
X                Putstr(cd_str);
X                while (y <= ylast) {
X                    if (has_xs) linemode[y][0] = NOCOOK;
X                    lenline[y++] = 0;
X                }
X                break;
X            }
X            else {
X                clr_to_eol();
X            }
X        }
X    }
X}
X
XHidden Procedure clr_to_eol()
X{
X    lenline[cur_y] = cur_x;
X    if (!has_xs && so_mode != Off)
X        standend();
X    Putstr(ce_str);
X    if (has_xs) {
X        if (cur_x == 0)
X            linemode[cur_y][0] = NOCOOK;
X        else if (linemode[cur_y][cur_x-1]&SOBIT)
X            standend();
X    }
X}
X
XHidden Procedure set_blanks(y, xfrom, xto)
X     int y;
X     int xfrom;
X     int xto;
X{
X    register int x;
X
X    for (x = xfrom; x < xto; x++) {
X        linedata[y][x] = ' ';
X        if (has_xs && lenline[y] >= x && linemode[y][x]&XSBIT)
X            linemode[y][x]= SECOOK;
X        else
X            linemode[y][x]= NOCOOK;
X    }
X}
X
X/*
X * outchar() is used by termcap's tputs.
X */
XHidden int outchar(ch)
X     char ch;
X{
X    fputc(ch, fp);
X}
X
X/*
X * Scrolling (part of) the screen up (or down, by<0).
X */
X
XVisible Procedure trmscrollup(yfirst, ylast, by)
X     register int yfirst;
X     register int ylast;
X     register int by;
X{
X#ifdef VTRMTRACE
X    if (vtrmfp) fprintf(vtrmfp, "\ttrmscrollup(%d, %d, %d);\n", yfirst, ylast, by);
X#endif
X    check_started("trmscrollup");
X
X    if (by == 0)
X        return;
X
X    if (yfirst < 0)
X        yfirst = 0;
X    if (ylast >= lines)
X        ylast = lines-1;
X
X    if (yfirst > ylast)
X        return;
X
X    if (!has_xs && so_mode != Off)
X        standend();
X
X    if (by > 0 && yfirst + by > ylast
X        ||
X        by < 0 && yfirst - by > ylast)
X    {
X        clear_lines(yfirst, ylast);
X        return;
X    }
X
X    if (canscroll) {
X        if (by > 0) {
X            (*scr_up)(yfirst, ylast, by);
X            scr_lines(yfirst, ylast, by, 1);
X        }
X        else if (by < 0) {
X            (*scr_down)(yfirst, ylast, -by);
X            scr_lines(ylast, yfirst, -by, -1);
X        }
X    }
X    else {
X        scr3up(yfirst, ylast, by);
X    }
X
X    VOID fflush(fp);
X}
X
XHidden Procedure scr_lines(yfrom, yto, n, dy)
X     int yfrom;
X     int yto;
X     int n;
X     int dy;
X{
X    register int y;
X    char *savedata;
X    char *savemode;
X
X    while (n-- > 0) {
X        savedata = linedata[yfrom];
X        savemode = linemode[yfrom];
X        for (y = yfrom; y != yto; y += dy) {
X            linedata[y] = linedata[y+dy];
X            linemode[y] = linemode[y+dy];
X            lenline[y] = lenline[y+dy];
X        }
X        linedata[yto] = savedata;
X        linemode[yto] = savemode;
X        lenline[yto] = 0;
X        if (has_xs) linemode[yto][0] = NOCOOK;
X    }
X}
X
XHidden Procedure scr1up(yfirst, ylast, n)
X     int yfirst;
X     int ylast;
X     int n;
X{
X    move(yfirst, 0);
X    dellines(n);
X    if (ylast < lines-1) {
X        move(ylast-n+1, 0);
X        addlines(n);
X    }
X}
X
X
XHidden Procedure scr1down(yfirst, ylast, n)
X     int yfirst;
X     int ylast;
X     int n;
X{
X    if (ylast == lines-1) {
X        clear_lines(ylast-n+1, ylast);
X    }
X    else {
X        move(ylast-n+1, 0);
X        dellines(n);
X    }
X    move(yfirst, 0);
X    addlines(n);
X}
X
X
XHidden Procedure addlines(n)
X     register int n;
X{
X    if (par_al_str && n > 1)
X            Putstr(tgoto(par_al_str, n, n));
X    else {
X        while (n-- > 0)
X            Putstr(al_str);
X    }
X}
X
X
XHidden Procedure dellines(n)
X     register int n;
X{
X    if (par_dl_str && n > 1)
X        Putstr(tgoto(par_dl_str, n, n));
X    else {
X        while (n-- > 0)
X            Putstr(dl_str);
X    }
X}
X
X
XHidden Procedure scr2up(yfirst, ylast, n)
X     int yfirst;
X     int ylast;
X     int n;
X{
X    Putstr(tgoto(cs_str, ylast, yfirst));
X    cur_y = cur_x = Undefined;
X    move(ylast, 0);
X    while (n-- > 0) {
X        Putstr(sf_str);
X        if (has_db && ylast == lines-1)
X            clr_to_eol();
X    }
X    Putstr(tgoto(cs_str, lines-1, 0));
X    cur_y = cur_x = Undefined;
X}
X
X
XHidden Procedure scr2down(yfirst, ylast, n)
X     int yfirst;
X     int ylast;
X     int n;
X{
X    Putstr(tgoto(cs_str, ylast, yfirst));
X    cur_y = cur_x = Undefined;
X    move(yfirst, 0);
X    while (n-- > 0) {
X        Putstr(sr_str);
X        if (has_da && yfirst == 0)
X            clr_to_eol();
X    }
X    Putstr(tgoto(cs_str, lines-1, 0));
X    cur_y = cur_x = Undefined;
X}
X
X/* for dumb scrolling, uses and updates internal administration */
X
XHidden Procedure scr3up(yfirst, ylast, by)
X     int yfirst;
X     int ylast;
X     int by;
X{
X    if (by > 0 && yfirst == 0) {
X        lf_scroll(ylast, by);
X    }
X    else if (by > 0) {
X        move_lines(yfirst+by, yfirst, ylast-yfirst+1-by, 1);
X        clear_lines(ylast-by+1, ylast);
X    }
X    else {
X        move_lines(ylast+by, ylast, ylast-yfirst+1+by, -1);
X        clear_lines(yfirst, yfirst-by-1);
X    }
X}
X
XHidden Procedure lf_scroll(yto, by)
X     int yto;
X     int by;
X{
X    register int n = by;
X
X    move(lines-1, 0);
X    while (n-- > 0) {
X        fputc('\n', fp);
X    }
X    scr_lines(0, lines-1, by, 1);
X    move_lines(lines-1-by, lines-1, lines-1-yto, -1);
X    clear_lines(yto-by+1, yto);
X}
X
XHidden Procedure move_lines(yfrom, yto, n, dy)
X     int yfrom;
X     int yto;
X     int n;
X     int dy;
X{
X    while (n-- > 0) {
X        put_line(yto, 0, linedata[yfrom], linemode[yfrom], lenline[yfrom]);
X        yfrom += dy;
X        yto += dy;
X    }
X}
X
X/*
X * Synchronization, move cursor to given position (or previous if < 0).
X */
X
XVisible Procedure trmsync(y, x)
X     int y;
X     int x;
X{
X#ifdef VTRMTRACE
X    if (vtrmfp) fprintf(vtrmfp, "\ttrmsync(%d, %d);\n", y, x);
X#endif
X    check_started("trmsync");
X
X    if (0 <= y && y < lines && 0 <= x && x < cols) {
X        move(y, x);
X        if (no_cursor) {
X            Putstr(ve_str);
X            no_cursor = No;
X        }
X    }
X    else if (no_cursor == No) {
X        Putstr(vi_str);
X        no_cursor = Yes;
X    }
X    VOID fflush(fp);
X}
X
X
X/*
X * Send a bell, visible if possible.
X */
X
XVisible Procedure trmbell()
X{
X#ifdef VTRMTRACE
X    if (vtrmfp) fprintf(vtrmfp, "\ttrmbell();\n");
X#endif
X    check_started("trmbell");
X
X    Putstr(vb_str);
X    VOID fflush(fp);
X}
X
X
X#ifdef SHOW
X
X/*
X * Show the current internal statuses of the screen on vtrmfp.
X * For debugging only.
X */
X
XVisible Procedure trmshow(s)
X     char *s;
X{
X    int y, x;
X
X    if (!vtrmfp)
X        return;
X    fprintf(vtrmfp, "<<< %s >>>\n", s);
X    for (y = 0; y < lines; y++) {
X        for (x = 0; x <= lenline[y] /*** && x < cols-1 ***/ ; x++) {
X            fputc(linedata[y][x], vtrmfp);
X        }
X        fputc('\n', vtrmfp);
X        for (x = 0; x <= lenline[y] && x < cols-1; x++) {
X            if (linemode[y][x]&SOBIT)
X                fputc('-', vtrmfp);
X            else
X                fputc(' ', vtrmfp);
X        }
X        fputc('\n', vtrmfp);
X        for (x = 0; x <= lenline[y] && x < cols-1; x++) {
X            if (linemode[y][x]&XSBIT)
X                fputc('+', vtrmfp);
X            else
X                fputc(' ', vtrmfp);
X        }
X        fputc('\n', vtrmfp);
X    }
X    fprintf(vtrmfp, "CUR_Y = %d, CUR_X = %d.\n", cur_y, cur_x);
X    VOID fflush(vtrmfp);
X}
X#endif
X
X
X/*
X * Return the next input character, or -1 if read fails.
X * Only the low 7 bits are returned, so reading in RAW mode is permissible
X * (although CBREAK is preferred if implemented).
X * To avoid having to peek in the input buffer for trmavail, we use the
X * 'read' system call rather than getchar().
X * (The interface allows 8-bit characters to be returned, to accomodate
X * larger character sets!)
X */
X
XHidden int pushback= -1;
X
XVisible int trminput()
X{
X    char c;
X    int n;
X
X#ifdef CATCHINTR
X    if (trmintrptd) {
X        trmintrptd= No;
X        return intrchar & 0377;
X    }
X#ifdef SETJMP
X    if (setjmp(readinterrupt) != 0) {
X        readintrcontext = No;
X        trmintrptd = No;
X        return intrchar & 0377;
X    }
X#endif
X#endif /* CATCHINTR */
X
X    if (pushback >= 0) {
X        c= pushback;
X        pushback= -1;
X        return c;
X    }
X#ifdef CATCHINTR
X    readintrcontext = Yes;
X#endif
X
X    n= read(0, &c, 1);
X
X#ifdef CATCHINTR
X    readintrcontext = No;
X#endif
X    if (n <= 0)
X        return -1;
X    return c & 0377;
X}
X
XHidden Procedure trmpushback(c)
X     int c;
X{
X    pushback= c;
X}
X
X
X/*
X * See if there's input available from the keyboard.
X * The code to do this is dependent on the type of Unix you have
X * (BSD, System V, ...).
X * Return value: 0 -- no input; 1 -- input; -1 -- unimplementable.
X * Note that each implementation form should first check pushback.
X *
X * TO DO:
X *    - Implement it for other than 4.x BSD! (notably System 5)
X */
X
X#ifdef HAS_SELECT
X
XHidden int dep_trmavail()
X{
X    int nfound, nfds, readfds;
X    static struct timeval timeout= {0, 0};
X
X    readfds= 1 << 0;
X    nfds= 0+1;
X    nfound= select(nfds, &readfds, (int*) 0, (int*) 0, &timeout);
X    return nfound > 0;
X}
X
X#define TRMAVAIL_DEFINED
X
X#else /* !HAS_SELECT */
X
X#ifdef HAS_TERMIO
X
XHidden int dep_trmavail()
X{
X    int n;
X    char c;
X
X    stty(0, &polltty);
X    n= read(0, &c, 1);
X    if (n == 1)
X        trmpushback((int)c);
X    stty(0, &newtty);
X    return n > 0;
X}
X
X#define TRMAVAIL_DEFINED
X
X#endif /* HAS_TERMIO */
X
X#endif /* HAS_SELECT */
X
X#ifndef TRMAVAIL_DEFINED
X
XHidden int dep_trmavail()
X{
X    return -1;
X}
X
X#endif
X
XVisible int trmavail()
X{
X#ifdef CATCHINTR
X    if (trmintrptd) return 1;
X#endif
X    if (pushback >= 0)
X        return 1;
X    return dep_trmavail(); /* dependent code */
X}
X
X/*
X * Suspend the interpreter or editor.
X * Should be called only after trmend and before trmstart!
X */
X
XVisible int trmsuspend()
X{
X#ifdef SIGTSTP
X    SIGTYPE (*oldsig)();
X
X    oldsig= signal(SIGTSTP, SIG_IGN);
X    if (oldsig == SIG_IGN) {
X        return subshell();
X    }
X    signal(SIGTSTP, oldsig);
X    kill(0, SIGSTOP);
X    return 1;
X#else /*SIGTSTP*/
X    return subshell();
X#endif /*SIGTSTP*/
X}
X
XHidden int subshell()
X{
X    int r;
X
X    r= system("exec ${SHELL-/bin/sh}");
X    if (r == -1 || r == 127)
X        return 0;
X    else
X        return 1;
X}
X
X
X/*
X * DESCRIPTION.
X *
X * This package uses termcap to determine the terminal capabilities.
X *
X * The lines and columns of our virtual terminal are numbered
X *    y = {0...lines-1} from top to bottom, and
X *    x = {0...cols-1} from left to right,
X * respectively.
X *
X * The Visible Procedures in this package are:
X *
X * trmstart(&lines, &cols, &flags)
X *     Obligatory initialization call (sets tty modes etc.),
X *     Returns the height and width of the screen to the integers
X *     whose addresses are passed as parameters, and a flag that
X *    describes some capabilities (see vtrm.h).
X *    Function return value: 0 if all went well, an error code if there
X *    is any trouble.  No messages are printed for errors.
X *
X * trmundefined()
X *      States that the screen contents are no longer valid.
X *      This is necessary for a hard redraw, for instance.
X *
X * trmsense(sense, format, &y, &x)
X *    Returns the cursor position through its parameters, for
X *      instance after a mouse click. Parameter 'sense' is a string
X *      that is sent to the terminal, if that is necessary or NULL if
X *      not. Parameter 'format' is a string that defines the format of
X *      the reply from the terminal.
X *
X * trmputdata(yfirst, ylast, indent, data)
X *     Fill lines {yfirst..ylast} with data, after skipping the initial
X *    'indent' positions. It is assumed that these positions do not contain
X *    anything dangerous (like standout cookies or null characters).
X *
X * trmscrollup(yfirst, ylast, by)
X *     Shift lines {yfirst..ylast} up by lines (down |by| if by < 0).
X *
X * trmsync(y, x)
X *     Output data to the terminal and set cursor position to (y, x).
X *
X * trmbell()
X *    Send a (possibly visible) bell immediately.
X *
X * trmend()
X *     Obligatory termination call (resets tty modes etc.).
X *
X *      You may call these as one or more cycles of:
X *             + trmstart
X *             +    zero or more times any of the other routines
X *             + trmend
X *      Trmend may be called even in the middle of trmstart; this is necessary
X *      to make it possible to write an interrupt handler that resets the tty
X *      state before exiting the program.
X *
X * ADDITIONAL SPECIFICATIONS (ROUTINES FOR CHARACTER INPUT)
X *
X * trminput()
X *    Return the next input character (with its parity bit cleared
X *    if any).  This value is a nonnegative int.  Returns -1 if the
X *    input can't be read any more.
X *
X * trmavail()
X *    Return 1 if there is an input character immediately available,
X *    0 if not.  Return -1 if not implementable.
X *
X * trminterrupt()
X *    Return 1 if an interrupt has occurred since the last call to
X *    trminput or trmavail, 0 else.  [Currently not implemented.]
X *
X * trmsuspend()
X *    When called in the proper environment (4BSD with job control
X *    enabled), suspends the editor, temporarily popping back to
X *    the calling shell.  The caller should have called trmend()
X *    first, and must call trmstart again afterwards.
X *    BUG: there is a timing window where keyboard-generated
X *    signals (such as interrupt) can reach the program.
X *    In non 4BSD we try to spawn a subshell.
X *    Returns 1 if suspend succeeded, 0 if it failed.
X *    (-1 iff not implementable).
X */
END_OF_FILE
if test 46848 -ne `wc -c <'stdwin/Ports/vtrm/vtrm.c'`; then
    echo shar: \"'stdwin/Ports/vtrm/vtrm.c'\" unpacked with wrong size!
fi
# end of 'stdwin/Ports/vtrm/vtrm.c'
fi
echo shar: End of shell archive.
exit 0