root/foundation-apps/mxterm-maxx/resize.c

/* $XTermId: resize.c,v 1.106 2007/12/31 21:10:07 tom Exp $ */

/*
 * Copyright 2003-2006,2007 by Thomas E. Dickey
 *
 *                         All Rights Reserved
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the name(s) of the above copyright
 * holders shall not be used in advertising or otherwise to promote the
 * sale, use or other dealings in this Software without prior written
 * authorization.
 *
 *
 * Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
 *
 *                         All Rights Reserved
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose and without fee is hereby granted,
 * provided that the above copyright notice appear in all copies and that
 * both that copyright notice and this permission notice appear in
 * supporting documentation, and that the name of Digital Equipment
 * Corporation not be used in advertising or publicity pertaining to
 * distribution of the software without specific, written prior permission.
 *
 *
 * DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
 * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
 * DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
 * ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

/* resize.c */

#include <xterm.h>
#include <stdio.h>
#include <ctype.h>
#include <xstrings.h>
#include <xtermcap.h>
#include <xterm_io.h>

#ifdef APOLLO_SR9
#define CANT_OPEN_DEV_TTY
#endif

#ifndef USE_TERMINFO            /* avoid conflict with configure script */
#if defined(__QNX__) || defined(__SCO__) || defined(linux) || defined(__OpenBSD__) || defined(__UNIXWARE__)
#define USE_TERMINFO
#endif
#endif

#if defined(__QNX__)
#include <unix.h>
#endif

/*
 * Some OS's may want to use both, like SCO for example.  We catch here anyone
 * who hasn't decided what they want.
 */
#if !defined(USE_TERMCAP) && !defined(USE_TERMINFO)
#define USE_TERMINFO
#endif

#include <signal.h>
#include <pwd.h>

#ifdef X_NOT_POSIX
#if !defined(SYSV) && !defined(i386)
extern struct passwd *getpwuid();       /* does ANYBODY need this? */
#endif /* SYSV && i386 */
#endif /* X_NOT_POSIX */

#ifndef bzero
#define bzero(s, n)     memset(s, 0, n)
#endif

#ifdef __MVS__
#define ESCAPE(string) "\047" string
#else
#define ESCAPE(string) "\033" string
#endif

#define EMULATIONS      2
#define SUN             1
#define VT100           0

#define TIMEOUT         10

#define SHELL_UNKNOWN   0
#define SHELL_C         1
#define SHELL_BOURNE    2
/* *INDENT-OFF* */
static struct {
    char *name;
    int type;
} shell_list[] = {
    { "csh",    SHELL_C },      /* vanilla cshell */
    { "tcsh",   SHELL_C },
    { "jcsh",   SHELL_C },
    { "sh",     SHELL_BOURNE }, /* vanilla Bourne shell */
    { "ksh",    SHELL_BOURNE }, /* Korn shell (from AT&T toolchest) */
    { "ksh-i",  SHELL_BOURNE }, /* other name for latest Korn shell */
    { "bash",   SHELL_BOURNE }, /* GNU Bourne again shell */
    { "jsh",    SHELL_BOURNE },
    { NULL,     SHELL_BOURNE }  /* default (same as xterm's) */
};
/* *INDENT-ON* */

static char *emuname[EMULATIONS] =
{
    "VT100",
    "Sun",
};
static char *myname;
static int shell_type = SHELL_UNKNOWN;
static char *getsize[EMULATIONS] =
{
    ESCAPE("7") ESCAPE("[r") ESCAPE("[999;999H") ESCAPE("[6n"),
    ESCAPE("[18t"),
};
#if defined(USE_STRUCT_TTYSIZE)
#elif defined(USE_STRUCT_WINSIZE)
static char *getwsize[EMULATIONS] =
{                               /* size in pixels */
    0,
    ESCAPE("[14t"),
};
#endif /* USE_STRUCT_{TTYSIZE|WINSIZE} */
static char *restore[EMULATIONS] =
{
    ESCAPE("8"),
    0,
};
static char *setname = "";
static char *setsize[EMULATIONS] =
{
    0,
    ESCAPE("[8;%s;%st"),
};

#ifdef USE_ANY_SYSV_TERMIO
static struct termio tioorig;
#elif defined(USE_TERMIOS)
static struct termios tioorig;
#else
static struct sgttyb sgorig;
#endif /* USE_ANY_SYSV_TERMIO/USE_TERMIOS */

static char *size[EMULATIONS] =
{
    ESCAPE("[%d;%dR"),
    ESCAPE("[8;%d;%dt"),
};
static char sunname[] = "sunsize";
static int tty;
static FILE *ttyfp;

#if defined(USE_STRUCT_TTYSIZE)
#elif defined(USE_STRUCT_WINSIZE)
static char *wsize[EMULATIONS] =
{
    0,
    ESCAPE("[4;%hd;%hdt"),
};
#endif /* USE_STRUCT_{TTYSIZE|WINSIZE} */

static SIGNAL_T onintr(int sig);
static SIGNAL_T resize_timeout(int sig);
static int checkdigits(char *str);
static void Usage(void);
static void readstring(FILE *fp, char *buf, char *str);

#ifdef USE_TERMCAP
static void
print_termcap(const char *termcap)
{
    int ch;

    putchar('\'');
    while ((ch = *termcap++) != '\0') {
        switch (ch & 0xff) {
        case 127:               /* undo bug in GNU termcap */
            printf("^?");
            break;
        case '\'':              /* must escape anyway (unlikely) */
            /* FALLTHRU */
        case '!':               /* must escape for SunOS csh */
            putchar('\\');
            /* FALLTHRU */
        default:
            putchar(ch);
            break;
        }
    }
    putchar('\'');
}
#endif /* USE_TERMCAP */

/*
   resets termcap string to reflect current screen size
 */
int
main(int argc, char **argv ENVP_ARG)
{
#ifdef USE_TERMCAP
    register char *env;
#endif
    register char *ptr;
    register int emu = VT100;
    char *shell;
    struct passwd *pw;
    int i;
    int rows, cols;
#ifdef USE_ANY_SYSV_TERMIO
    struct termio tio;
#elif defined(USE_TERMIOS)
    struct termios tio;
#else
    struct sgttyb sg;
#endif /* USE_ANY_SYSV_TERMIO/USE_TERMIOS */
#ifdef USE_TERMCAP
    int ok_tcap = 1;
    char termcap[TERMCAP_SIZE];
    char newtc[TERMCAP_SIZE];
#endif /* USE_TERMCAP */
    char buf[BUFSIZ];
#ifdef TTYSIZE_STRUCT
    TTYSIZE_STRUCT ts;
#endif
    char *name_of_tty;
#ifdef CANT_OPEN_DEV_TTY
    extern char *ttyname();
#endif

    myname = x_basename(argv[0]);
    if (strcmp(myname, sunname) == 0)
        emu = SUN;
    for (argv++, argc--; argc > 0 && **argv == '-'; argv++, argc--) {
        switch ((*argv)[1]) {
        case 's':               /* Sun emulation */
            if (emu == SUN)
                Usage();        /* Never returns */
            emu = SUN;
            break;
        case 'u':               /* Bourne (Unix) shell */
            shell_type = SHELL_BOURNE;
            break;
        case 'c':               /* C shell */
            shell_type = SHELL_C;
            break;
        default:
            Usage();            /* Never returns */
        }
    }

    if (SHELL_UNKNOWN == shell_type) {
        /* Find out what kind of shell this user is running.
         * This is the same algorithm that xterm uses.
         */
        if (((ptr = x_getenv("SHELL")) == NULL) &&
            (((pw = getpwuid(getuid())) == NULL) ||
             *(ptr = pw->pw_shell) == 0))
            /* this is the same default that xterm uses */
            ptr = "/bin/sh";

        shell = x_basename(ptr);

        /* now that we know, what kind is it? */
        for (i = 0; shell_list[i].name; i++)
            if (!strcmp(shell_list[i].name, shell))
                break;
        shell_type = shell_list[i].type;
    }

    if (argc == 2) {
        if (!setsize[emu]) {
            fprintf(stderr,
                    "%s: Can't set window size under %s emulation\n",
                    myname, emuname[emu]);
            exit(1);
        }
        if (!checkdigits(argv[0]) || !checkdigits(argv[1]))
            Usage();            /* Never returns */
    } else if (argc != 0)
        Usage();                /* Never returns */

#ifdef CANT_OPEN_DEV_TTY
    if ((name_of_tty = ttyname(fileno(stderr))) == NULL)
#endif
        name_of_tty = "/dev/tty";

    if ((ttyfp = fopen(name_of_tty, "r+")) == NULL) {
        fprintf(stderr, "%s:  can't open terminal %s\n",
                myname, name_of_tty);
        exit(1);
    }
    tty = fileno(ttyfp);
#ifdef USE_TERMCAP
    if ((env = x_getenv("TERM")) == 0) {
        env = DFT_TERMTYPE;
        if (SHELL_BOURNE == shell_type)
            setname = "TERM=" DFT_TERMTYPE ";\nexport TERM;\n";
        else
            setname = "setenv TERM " DFT_TERMTYPE ";\n";
    }
    termcap[0] = 0;             /* ...just in case we've accidentally gotten terminfo */
    if (tgetent(termcap, env) <= 0 || termcap[0] == 0)
        ok_tcap = 0;
#endif /* USE_TERMCAP */
#ifdef USE_TERMINFO
    if (x_getenv("TERM") == 0) {
        if (SHELL_BOURNE == shell_type)
            setname = "TERM=" DFT_TERMTYPE ";\nexport TERM;\n";
        else
            setname = "setenv TERM " DFT_TERMTYPE ";\n";
    }
#endif /* USE_TERMINFO */

#ifdef USE_ANY_SYSV_TERMIO
    ioctl(tty, TCGETA, &tioorig);
    tio = tioorig;
    tio.c_iflag &= ~(ICRNL | IUCLC);
    tio.c_lflag &= ~(ICANON | ECHO);
    tio.c_cflag |= CS8;
    tio.c_cc[VMIN] = 6;
    tio.c_cc[VTIME] = 1;
#elif defined(USE_TERMIOS)
    tcgetattr(tty, &tioorig);
    tio = tioorig;
    tio.c_iflag &= ~ICRNL;
    tio.c_lflag &= ~(ICANON | ECHO);
    tio.c_cflag |= CS8;
    tio.c_cc[VMIN] = 6;
    tio.c_cc[VTIME] = 1;
#else /* not USE_TERMIOS */
    ioctl(tty, TIOCGETP, &sgorig);
    sg = sgorig;
    sg.sg_flags |= RAW;
    sg.sg_flags &= ~ECHO;
#endif /* USE_ANY_SYSV_TERMIO/USE_TERMIOS */
    signal(SIGINT, onintr);
    signal(SIGQUIT, onintr);
    signal(SIGTERM, onintr);
#ifdef USE_ANY_SYSV_TERMIO
    ioctl(tty, TCSETAW, &tio);
#elif defined(USE_TERMIOS)
    tcsetattr(tty, TCSADRAIN, &tio);
#else /* not USE_TERMIOS */
    ioctl(tty, TIOCSETP, &sg);
#endif /* USE_ANY_SYSV_TERMIO/USE_TERMIOS */

    if (argc == 2) {
        char *tmpbuf = TypeMallocN(char,
                                   strlen(setsize[emu]) +
                                   strlen(argv[0]) +
                                   strlen(argv[1]) +
                                   1);
        if (tmpbuf == 0) {
            fprintf(stderr, "%s: Cannot query size\n", myname);
            onintr(0);
        }
        sprintf(tmpbuf, setsize[emu], argv[0], argv[1]);
        write(tty, tmpbuf, strlen(tmpbuf));
        free(tmpbuf);
    }
    write(tty, getsize[emu], strlen(getsize[emu]));
    readstring(ttyfp, buf, size[emu]);
    if (sscanf(buf, size[emu], &rows, &cols) != 2) {
        fprintf(stderr, "%s: Can't get rows and columns\r\n", myname);
        onintr(0);
    }
    if (restore[emu])
        write(tty, restore[emu], strlen(restore[emu]));
#if defined(USE_STRUCT_TTYSIZE)
    /* finally, set the tty's window size */
    if (ioctl(tty, TIOCGSIZE, &ts) != -1) {
        TTYSIZE_ROWS(ts) = rows;
        TTYSIZE_COLS(ts) = cols;
        SET_TTYSIZE(tty, ts);
    }
#elif defined(USE_STRUCT_WINSIZE)
    /* finally, set the tty's window size */
    if (getwsize[emu]) {
        /* get the window size in pixels */
        write(tty, getwsize[emu], strlen(getwsize[emu]));
        readstring(ttyfp, buf, wsize[emu]);
        if (sscanf(buf, wsize[emu], &ts.ws_xpixel, &ts.ws_ypixel) != 2) {
            fprintf(stderr, "%s: Can't get window size\r\n", myname);
            onintr(0);
        }
        TTYSIZE_ROWS(ts) = rows;
        TTYSIZE_COLS(ts) = cols;
        SET_TTYSIZE(tty, ts);
    } else if (ioctl(tty, TIOCGWINSZ, &ts) != -1) {
        /* we don't have any way of directly finding out
           the current height & width of the window in pixels.  We try
           our best by computing the font height and width from the "old"
           window-size values, and multiplying by these ratios... */
        if (TTYSIZE_COLS(ts) != 0)
            ts.ws_xpixel = cols * (ts.ws_xpixel / TTYSIZE_COLS(ts));
        if (TTYSIZE_ROWS(ts) != 0)
            ts.ws_ypixel = rows * (ts.ws_ypixel / TTYSIZE_ROWS(ts));
        TTYSIZE_ROWS(ts) = rows;
        TTYSIZE_COLS(ts) = cols;
        SET_TTYSIZE(tty, ts);
    }
#endif /* USE_STRUCT_{TTYSIZE|WINSIZE} */

#ifdef USE_ANY_SYSV_TERMIO
    ioctl(tty, TCSETAW, &tioorig);
#elif defined(USE_TERMIOS)
    tcsetattr(tty, TCSADRAIN, &tioorig);
#else /* not USE_TERMIOS */
    ioctl(tty, TIOCSETP, &sgorig);
#endif /* USE_ANY_SYSV_TERMIO/USE_TERMIOS */
    signal(SIGINT, SIG_DFL);
    signal(SIGQUIT, SIG_DFL);
    signal(SIGTERM, SIG_DFL);

#ifdef USE_TERMCAP
    if (ok_tcap) {
        /* update termcap string */
        /* first do columns */
        if ((ptr = x_strindex(termcap, "co#")) == NULL) {
            fprintf(stderr, "%s: No `co#'\n", myname);
            exit(1);
        }

        i = ptr - termcap + 3;
        strncpy(newtc, termcap, (unsigned) i);
        sprintf(newtc + i, "%d", cols);
        ptr = strchr(ptr, ':');
        strcat(newtc, ptr);

        /* now do lines */
        if ((ptr = x_strindex(newtc, "li#")) == NULL) {
            fprintf(stderr, "%s: No `li#'\n", myname);
            exit(1);
        }

        i = ptr - newtc + 3;
        strncpy(termcap, newtc, (unsigned) i);
        sprintf(termcap + i, "%d", rows);
        ptr = strchr(ptr, ':');
        strcat(termcap, ptr);
    }
#endif /* USE_TERMCAP */

    if (SHELL_BOURNE == shell_type) {

#ifdef USE_TERMCAP
        if (ok_tcap) {
            printf("%sTERMCAP=", setname);
            print_termcap(termcap);
            printf(";\nexport TERMCAP;\n");
        }
#endif /* USE_TERMCAP */
#ifdef USE_TERMINFO
        printf("%sCOLUMNS=%d;\nLINES=%d;\nexport COLUMNS LINES;\n",
               setname, cols, rows);
#endif /* USE_TERMINFO */

    } else {                    /* not Bourne shell */

#ifdef USE_TERMCAP
        if (ok_tcap) {
            printf("set noglob;\n%ssetenv TERMCAP ", setname);
            print_termcap(termcap);
            printf(";\nunset noglob;\n");
        }
#endif /* USE_TERMCAP */
#ifdef USE_TERMINFO
        printf("set noglob;\n%ssetenv COLUMNS '%d';\nsetenv LINES '%d';\nunset noglob;\n",
               setname, cols, rows);
#endif /* USE_TERMINFO */
    }
    exit(0);
}

static int
checkdigits(register char *str)
{
    while (*str) {
        if (!isdigit(CharOf(*str)))
            return (0);
        str++;
    }
    return (1);
}

static void
readstring(register FILE *fp, register char *buf, char *str)
{
    register int last, c;
#if !defined(USG) && !defined(__UNIXOS2__)
    /* What is the advantage of setitimer() over alarm()? */
    struct itimerval it;
#endif

    signal(SIGALRM, resize_timeout);
#if defined(USG) || defined(__UNIXOS2__)
    alarm(TIMEOUT);
#else
    bzero((char *) &it, sizeof(struct itimerval));
    it.it_value.tv_sec = TIMEOUT;
    setitimer(ITIMER_REAL, &it, (struct itimerval *) NULL);
#endif
    if ((c = getc(fp)) == 0233) {       /* meta-escape, CSI */
        *buf++ = c = ESCAPE("")[0];
        *buf++ = '[';
    } else {
        *buf++ = c;
    }
    if (c != *str) {
        fprintf(stderr, "%s: unknown character, exiting.\r\n", myname);
        onintr(0);
    }
    last = str[strlen(str) - 1];
    while ((*buf++ = getc(fp)) != last) ;
#if defined(USG) || defined(__UNIXOS2__)
    alarm(0);
#else
    bzero((char *) &it, sizeof(struct itimerval));
    setitimer(ITIMER_REAL, &it, (struct itimerval *) NULL);
#endif
    *buf = 0;
}

static void
Usage(void)
{
    fprintf(stderr, strcmp(myname, sunname) == 0 ?
            "Usage: %s [rows cols]\n" :
            "Usage: %s [-u] [-c] [-s [rows cols]]\n", myname);
    exit(1);
}

static SIGNAL_T
resize_timeout(int sig)
{
    fprintf(stderr, "\n%s: Time out occurred\r\n", myname);
    onintr(sig);
}

/* ARGSUSED */
static SIGNAL_T
onintr(int sig GCC_UNUSED)
{
#ifdef USE_ANY_SYSV_TERMIO
    ioctl(tty, TCSETAW, &tioorig);
#elif defined(USE_TERMIOS)
    tcsetattr(tty, TCSADRAIN, &tioorig);
#else /* not USE_TERMIOS */
    ioctl(tty, TIOCSETP, &sgorig);
#endif /* USE_ANY_SYSV_TERMIO/USE_TERMIOS */
    exit(1);
}