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path: root/Src/init.c
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/*
 * init.c - main loop and initialization routines
 *
 * This file is part of zsh, the Z shell.
 *
 * Copyright (c) 1992-1997 Paul Falstad
 * All rights reserved.
 *
 * Permission is hereby granted, without written agreement and without
 * license or royalty fees, to use, copy, modify, and distribute this
 * software and to distribute modified versions of this software for any
 * purpose, provided that the above copyright notice and the following
 * two paragraphs appear in all copies of this software.
 *
 * In no event shall Paul Falstad or the Zsh Development Group be liable
 * to any party for direct, indirect, special, incidental, or consequential
 * damages arising out of the use of this software and its documentation,
 * even if Paul Falstad and the Zsh Development Group have been advised of
 * the possibility of such damage.
 *
 * Paul Falstad and the Zsh Development Group specifically disclaim any
 * warranties, including, but not limited to, the implied warranties of
 * merchantability and fitness for a particular purpose.  The software
 * provided hereunder is on an "as is" basis, and Paul Falstad and the
 * Zsh Development Group have no obligation to provide maintenance,
 * support, updates, enhancements, or modifications.
 *
 */

#include "zsh.mdh"

#include "zshpaths.h"
#include "zshxmods.h"

#include "init.pro"

#include "version.h"

/**/
int noexitct = 0;

/* buffer for $_ and its length */

/**/
char *underscore;

/**/
int underscorelen, underscoreused;

/* what level of sourcing we are at */
 
/**/
int sourcelevel;

/* the shell tty fd */

/**/
mod_export int SHTTY;

/* the FILE attached to the shell tty */

/**/
mod_export FILE *shout;

/* termcap strings */
 
/**/
mod_export char *tcstr[TC_COUNT];

/* lengths of each termcap string */
 
/**/
mod_export int tclen[TC_COUNT];

/* Values of the li, co and am entries */

/**/
int tclines, tccolumns;
/**/
mod_export int hasam;

/* Pointer to read-key function from zle */

/**/
mod_export int (*getkeyptr) _((int));

/* SIGCHLD mask */

/**/
mod_export sigset_t sigchld_mask;

/**/
mod_export struct hookdef zshhooks[] = {
    HOOKDEF("exit", NULL, HOOKF_ALL),
    HOOKDEF("before_trap", NULL, HOOKF_ALL),
    HOOKDEF("after_trap", NULL, HOOKF_ALL),
};

/* keep executing lists until EOF found */

/**/
void
loop(int toplevel, int justonce)
{
    Eprog prog;

    pushheap();
    for (;;) {
	freeheap();
	if (stophist == 3)	/* re-entry via preprompt() */
	    hend(NULL);
	hbegin(1);		/* init history mech        */
	if (isset(SHINSTDIN)) {
	    setblock_stdin();
	    if (interact) {
	        int hstop = stophist;
		stophist = 3;
		preprompt();
		if (stophist != 3)
		    hbegin(1);
		else
		    stophist = hstop;
		errflag = 0;
	    }
	}
	intr();			/* interrupts on            */
	lexinit();              /* initialize lexical state */
	if (!(prog = parse_event())) {	/* if we couldn't parse a list */
	    hend(NULL);
	    if ((tok == ENDINPUT && !errflag) ||
		(tok == LEXERR && (!isset(SHINSTDIN) || !toplevel)) ||
		justonce)
		break;
	    continue;
	}
	if (hend(prog)) {
	    int toksav = tok;
	    Eprog preprog;

	    if (toplevel && (preprog = getshfunc("preexec")) != &dummy_eprog) {
		LinkList args;
		int osc = sfcontext;
		char *cmdstr;

		args = znewlinklist();
		zaddlinknode(args, "preexec");
		/* If curline got dumped from the history, we don't know
		 * what the user typed. */
		if (hist_ring && curline.histnum == curhist)
		    zaddlinknode(args, hist_ring->text);
		else
		    zaddlinknode(args, "");
		zaddlinknode(args, getjobtext(prog, NULL));
		zaddlinknode(args, cmdstr = getpermtext(prog, NULL));

		sfcontext = SFC_HOOK;
		doshfunc("preexec", preprog, args, 0, 1);
		sfcontext = osc;
		zsfree(cmdstr);
		freelinklist(args, (FreeFunc) NULL);
		errflag = 0;
	    }
	    if (stopmsg)	/* unset 'you have stopped jobs' flag */
		stopmsg--;
	    execode(prog, 0, 0);
	    tok = toksav;
	    if (toplevel)
		noexitct = 0;
	}
	if (ferror(stderr)) {
	    zerr("write error", NULL, 0);
	    clearerr(stderr);
	}
	if (subsh)		/* how'd we get this far in a subshell? */
	    exit(lastval);
	if (((!interact || sourcelevel) && errflag) || retflag)
	    break;
	if (trapreturn) {
	    lastval = trapreturn;
	    trapreturn = 0;
	}
	if (isset(SINGLECOMMAND) && toplevel) {
	    if (sigtrapped[SIGEXIT])
		dotrap(SIGEXIT);
	    exit(lastval);
	}
	if (justonce)
	    break;
    }
    popheap();
}

static char *cmd;
static int restricted;

/**/
void
parseargs(char **argv)
{
    int optionbreak = 0;
    char **x;
    int action, optno;
    LinkList paramlist;

    argzero = *argv++;
    SHIN = 0;

    /* There's a bit of trickery with opts[INTERACTIVE] here.  It starts *
     * at a value of 2 (instead of 1) or 0.  If it is explicitly set on  *
     * the command line, it goes to 1 or 0.  If input is coming from     *
     * somewhere that normally makes the shell non-interactive, we do    *
     * "opts[INTERACTIVE] &= 1", so that only a *default* on state will  *
     * be changed.  At the end of the function, a value of 2 gets        *
     * changed to 1.                                                     */
    opts[INTERACTIVE] = isatty(0) ? 2 : 0;
    opts[SHINSTDIN] = 0;
    opts[SINGLECOMMAND] = 0;

    /* loop through command line options (begins with "-" or "+") */
    while (!optionbreak && *argv && (**argv == '-' || **argv == '+')) {
	char *args = *argv;
	action = (**argv == '-');
	if (!argv[0][1])
	    *argv = "--";
	while (*++*argv) {
	    if (**argv == '-') {
		if(!argv[0][1]) {
		    /* The pseudo-option `--' signifies the end of options. */
		    argv++;
		    goto doneoptions;
		}
		if(*argv != args+1 || **argv != '-')
		    goto badoptionstring;
		/* GNU-style long options */
		++*argv;
		if (!strcmp(*argv, "version")) {
		    printf("zsh %s (%s-%s-%s)\n",
			    ZSH_VERSION, MACHTYPE, VENDOR, OSTYPE);
		    exit(0);
		}
		if (!strcmp(*argv, "help")) {
		    printhelp();
		    exit(0);
		}
		/* `-' characters are allowed in long options */
		for(args = *argv; *args; args++)
		    if(*args == '-')
			*args = '_';
		goto longoptions;
	    }

	    if (unset(SHOPTIONLETTERS) && **argv == 'b') {
		/* -b ends options at the end of this argument */
		optionbreak = 1;
	    } else if (**argv == 'c') {
		/* -c command */
		cmd = *argv;
		opts[INTERACTIVE] &= 1;
		opts[SHINSTDIN] = 0;
		scriptname = ztrdup("zsh");
	    } else if (**argv == 'o') {
		if (!*++*argv)
		    argv++;
		if (!*argv) {
		    zerr("string expected after -o", NULL, 0);
		    exit(1);
		}
	    longoptions:
		if (!(optno = optlookup(*argv))) {
		    zerr("no such option: %s", *argv, 0);
		    exit(1);
		} else if (optno == RESTRICTED)
		    restricted = action;
		else
		    dosetopt(optno, action, 1);
              break;
	    } else if (isspace(STOUC(**argv))) {
		/* zsh's typtab not yet set, have to use ctype */
		while (*++*argv)
		    if (!isspace(STOUC(**argv))) {
		    badoptionstring:
			zerr("bad option string: `%s'", args, 0);
			exit(1);
		    }
		break;
	    } else {
	    	if (!(optno = optlookupc(**argv))) {
		    zerr("bad option: -%c", NULL, **argv);
		    exit(1);
		} else if (optno == RESTRICTED)
		    restricted = action;
		else
		    dosetopt(optno, action, 1);
	    }
	}
	argv++;
    }
    doneoptions:
    paramlist = znewlinklist();
    if (cmd) {
	if (!*argv) {
	    zerr("string expected after -%s", cmd, 0);
	    exit(1);
	}
	cmd = *argv++;
    }
    if (*argv) {
	if (unset(SHINSTDIN)) {
	    argzero = *argv;
	    if (!cmd)
		SHIN = movefd(open(unmeta(argzero), O_RDONLY | O_NOCTTY));
	    if (SHIN == -1) {
		zerr("can't open input file: %s", argzero, 0);
		exit(1);
	    }
	    opts[INTERACTIVE] &= 1;
	    argv++;
	}
	while (*argv)
	    zaddlinknode(paramlist, ztrdup(*argv++));
    } else
	opts[SHINSTDIN] = 1;
    if(isset(SINGLECOMMAND))
	opts[INTERACTIVE] &= 1;
    opts[INTERACTIVE] = !!opts[INTERACTIVE];
    pparams = x = (char **) zcalloc((countlinknodes(paramlist) + 1) * sizeof(char *));

    while ((*x++ = (char *)getlinknode(paramlist)));
    free(paramlist);
    argzero = ztrdup(argzero);
}

/**/
static void
printhelp(void)
{
    printf("Usage: %s [<options>] [<argument> ...]\n", argzero);
    printf("\nSpecial options:\n");
    printf("  --help     show this message, then exit\n");
    printf("  --version  show zsh version number, then exit\n");
    if(unset(SHOPTIONLETTERS))
	printf("  -b         end option processing, like --\n");
    printf("  -c         take first argument as a command to execute\n");
    printf("  -o OPTION  set an option by name (see below)\n");
    printf("\nNormal options are named.  An option may be turned on by\n");
    printf("`-o OPTION', `--OPTION', `+o no_OPTION' or `+-no-OPTION'.  An\n");
    printf("option may be turned off by `-o no_OPTION', `--no-OPTION',\n");
    printf("`+o OPTION' or `+-OPTION'.  Options are listed below only in\n");
    printf("`--OPTION' or `--no-OPTION' form.\n");
    printoptionlist();
}

/**/
mod_export void
init_io(void)
{
    long ttpgrp;
    static char outbuf[BUFSIZ], errbuf[BUFSIZ];

#ifdef RSH_BUG_WORKAROUND
    int i;
#endif

/* stdout, stderr fully buffered */
#ifdef _IOFBF
    setvbuf(stdout, outbuf, _IOFBF, BUFSIZ);
    setvbuf(stderr, errbuf, _IOFBF, BUFSIZ);
#else
    setbuffer(stdout, outbuf, BUFSIZ);
    setbuffer(stderr, errbuf, BUFSIZ);
#endif

/* This works around a bug in some versions of in.rshd. *
 * Currently this is not defined by default.            */
#ifdef RSH_BUG_WORKAROUND
    if (cmd) {
	for (i = 3; i < 10; i++)
	    close(i);
    }
#endif

    if (shout) {
	fclose(shout);
	shout = 0;
    }
    if (SHTTY != -1) {
	zclose(SHTTY);
	SHTTY = -1;
    }

    /* Send xtrace output to stderr -- see execcmd() */
    xtrerr = stderr;

    /* Make sure the tty is opened read/write. */
    if (isatty(0)) {
	zsfree(ttystrname);
	if ((ttystrname = ztrdup(ttyname(0)))) {
	    SHTTY = movefd(open(ttystrname, O_RDWR | O_NOCTTY));
#ifdef TIOCNXCL
	    /*
	     * See if the terminal claims to be busy.  If so, and fd 0
	     * is a terminal, try and set non-exclusive use for that.
	     * This is something to do with Solaris over-cleverness.
	     */
	    if (SHTTY == -1 && errno == EBUSY)
		ioctl(0, TIOCNXCL, 0);
#endif
	}
	/*
	 * xterm, rxvt and probably all terminal emulators except
	 * dtterm on Solaris 2.6 & 7 have a bug. Applications are
	 * unable to open /dev/tty or /dev/pts/<terminal number here>
	 * because something in Sun's STREAMS modules doesn't like
	 * it. The open() call fails with EBUSY which is not even
	 * listed as a possibility in the open(2) man page.  So we'll
	 * try to outsmart The Company.  -- <dave@srce.hr>
	 *
	 * Presumably there's no harm trying this on any OS, given that
	 * isatty(0) worked but opening the tty didn't.  Possibly we won't
	 * get the tty read/write, but it's the best we can do -- pws
	 *
	 * Try both stdin and stdout before trying /dev/tty. -- Bart
	 */
#if defined(HAVE_FCNTL_H) && defined(F_GETFL)
#define rdwrtty(fd)	((fcntl(fd, F_GETFL, 0) & O_RDWR) == O_RDWR)
#else
#define rdwrtty(fd)	1
#endif
	if (SHTTY == -1 && rdwrtty(0)) {
	    SHTTY = movefd(dup(0));
	}
    }
    if (SHTTY == -1 && isatty(1) && rdwrtty(1) &&
	(SHTTY = movefd(dup(1))) != -1) {
	zsfree(ttystrname);
	ttystrname = ztrdup(ttyname(1));
    }
    if (SHTTY == -1 &&
	(SHTTY = movefd(open("/dev/tty", O_RDWR | O_NOCTTY))) != -1) {
	zsfree(ttystrname);
	ttystrname = ztrdup(ttyname(SHTTY));
    }
    if (SHTTY == -1) {
	zsfree(ttystrname);
	ttystrname = ztrdup("");
    } else if (!ttystrname) {
	ttystrname = ztrdup("/dev/tty");
    }

    /* We will only use zle if shell is interactive, *
     * SHTTY != -1, and shout != 0                   */
    if (interact && SHTTY != -1) {
	init_shout();
	if(!shout)
	    opts[USEZLE] = 0;
    } else
	opts[USEZLE] = 0;

#ifdef JOB_CONTROL
    /* If interactive, make the shell the foreground process */
    if (opts[MONITOR] && interact && (SHTTY != -1)) {
	if ((mypgrp = GETPGRP()) > 0) {
	    while ((ttpgrp = gettygrp()) != -1 && ttpgrp != mypgrp) {
		sleep(1);	/* give parent time to change pgrp */
		mypgrp = GETPGRP();
		if (mypgrp == mypid)
		    attachtty(mypgrp);
		if (mypgrp == gettygrp())
		    break;
		killpg(mypgrp, SIGTTIN);
		mypgrp = GETPGRP();
	    }
	} else
	    opts[MONITOR] = 0;
    } else
	opts[MONITOR] = 0;
#else
    opts[MONITOR] = 0;
#endif
}

/**/
mod_export void
init_shout(void)
{
    static char shoutbuf[BUFSIZ];
#if defined(JOB_CONTROL) && defined(TIOCSETD) && defined(NTTYDISC)
    int ldisc = NTTYDISC;

    ioctl(SHTTY, TIOCSETD, (char *)&ldisc);
#endif

    /* Associate terminal file descriptor with a FILE pointer */
    shout = fdopen(SHTTY, "w");
#ifdef _IOFBF
    setvbuf(shout, shoutbuf, _IOFBF, BUFSIZ);
#endif
  
    gettyinfo(&shttyinfo);	/* get tty state */
#if defined(__sgi)
    if (shttyinfo.tio.c_cc[VSWTCH] <= 0)	/* hack for irises */
	shttyinfo.tio.c_cc[VSWTCH] = CSWTCH;
#endif
}

/* names of the termcap strings we want */

static char *tccapnams[TC_COUNT] = {
    "cl", "le", "LE", "nd", "RI", "up", "UP", "do",
    "DO", "dc", "DC", "ic", "IC", "cd", "ce", "al", "dl", "ta",
    "md", "so", "us", "me", "se", "ue", "ch",
    "ku", "kd", "kl", "kr"
};

/* Initialise termcap */

/**/
mod_export int
init_term(void)
{
#ifndef TGETENT_ACCEPTS_NULL
    static char termbuf[2048];	/* the termcap buffer */
#endif

    if (!*term) {
	termflags |= TERM_UNKNOWN;
	return 0;
    }

    /* unset zle if using zsh under emacs */
    if (!strcmp(term, "emacs"))
	opts[USEZLE] = 0;

#ifdef TGETENT_ACCEPTS_NULL
    /* If possible, we let tgetent allocate its own termcap buffer */
    if (tgetent(NULL, term) != TGETENT_SUCCESS)
#else
    if (tgetent(termbuf, term) != TGETENT_SUCCESS)
#endif
    {
	if (isset(INTERACTIVE))
	    zerr("can't find terminal definition for %s", term, 0);
	errflag = 0;
	termflags |= TERM_BAD;
	return 0;
    } else {
	char tbuf[1024], *pp;
	int t0;

	termflags &= ~TERM_BAD;
	termflags &= ~TERM_UNKNOWN;
	for (t0 = 0; t0 != TC_COUNT; t0++) {
	    pp = tbuf;
	    zsfree(tcstr[t0]);
	/* AIX tgetstr() ignores second argument */
	    if (!(pp = tgetstr(tccapnams[t0], &pp)))
		tcstr[t0] = NULL, tclen[t0] = 0;
	    else {
		tclen[t0] = strlen(pp);
		tcstr[t0] = (char *) zalloc(tclen[t0] + 1);
		memcpy(tcstr[t0], pp, tclen[t0] + 1);
	    }
	}

	/* check whether terminal has automargin (wraparound) capability */
	hasam = tgetflag("am");

	tclines = tgetnum("li");
	tccolumns = tgetnum("co");

	/* if there's no termcap entry for cursor up, use single line mode: *
	 * this is flagged by termflags which is examined in zle_refresh.c  *
	 */
	if (tccan(TCUP))
	    termflags &= ~TERM_NOUP;
	else {
	    tcstr[TCUP] = NULL;
	    termflags |= TERM_NOUP;
	}

	/* if there's no termcap entry for cursor left, use \b. */
	if (!tccan(TCLEFT)) {
	    tcstr[TCLEFT] = ztrdup("\b");
	    tclen[TCLEFT] = 1;
	}

	/* if the termcap entry for down is \n, don't use it. */
	if (tccan(TCDOWN) && tcstr[TCDOWN][0] == '\n') {
	    tclen[TCDOWN] = 0;
	    zsfree(tcstr[TCDOWN]);
	    tcstr[TCDOWN] = NULL;
	}

	/* if there's no termcap entry for clear, use ^L. */
	if (!tccan(TCCLEARSCREEN)) {
	    tcstr[TCCLEARSCREEN] = ztrdup("\14");
	    tclen[TCCLEARSCREEN] = 1;
	}
    }
    return 1;
}

/* Initialize lots of global variables and hash tables */

/**/
void
setupvals(void)
{
#ifdef HAVE_GETPWUID
    struct passwd *pswd;
#endif
    struct timezone dummy_tz;
    char *ptr;
    int i, j;
#if defined(SITEFPATH_DIR) || defined(FPATH_DIR)
    char **fpathptr;
# if defined(FPATH_DIR) && defined(FPATH_SUBDIRS)
    char *fpath_subdirs[] = FPATH_SUBDIRS;
# endif
# ifdef SITEFPATH_DIR
    int fpathlen = 1;
# else
    int fpathlen = 0;
# endif
#endif
    int close_fds[10], tmppipe[2];

    /*
     * Workaround a problem with NIS (in one guise or another) which
     * grabs file descriptors and keeps them for future reference.
     * We don't want these to be in the range where the user can
     * open fd's, i.e. 0 to 9 inclusive.  So we make sure all
     * fd's in that range are in use.
     */
    memset(close_fds, 0, 10*sizeof(int));
    if (pipe(tmppipe) == 0) {
	/*
	 * Strategy:  Make sure we have at least fd 0 open (hence
	 * the pipe).  From then on, keep dup'ing until we are
	 * up to 9.  If we go over the top, close immediately, else
	 * mark for later closure.
	 */
	i = -1;			/* max fd we have checked */
	while (i < 9) {
	    /* j is current fd */
	    if (i < tmppipe[0])
		j = tmppipe[0];
	    else if (i < tmppipe[1])
		j = tmppipe[1];
	    else {
		j = dup(0);
		if (j == -1)
		    break;
	    }
	    if (j < 10)
		close_fds[j] = 1;
	    else
		close(j);
	    if (i < j)
		i = j;
	}
	if (i < tmppipe[0])
	    close(tmppipe[0]);
	if (i < tmppipe[1])
	    c