source: trunk/src/kash/main.c

/*      $NetBSD: main.c,v 1.48 2003/09/14 12:09:29 jmmv Exp $   */

/*-
 * Copyright (c) 1991, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * 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.
 */

#if 0
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1991, 1993\n\
        The Regents of the University of California.  All rights reserved.\n");
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)main.c      8.7 (Berkeley) 7/19/95";
#else
__RCSID("$NetBSD: main.c,v 1.48 2003/09/14 12:09:29 jmmv Exp $");
#endif /* not lint */
#endif

#include <errno.h>
#include <stdio.h>
#include <sys/stat.h>
#include <locale.h>


#include "shell.h"
#include "main.h"
#include "mail.h"
#include "options.h"
#include "output.h"
#include "parser.h"
#include "nodes.h"
#include "expand.h"
#include "eval.h"
#include "jobs.h"
#include "input.h"
#include "trap.h"
#include "var.h"
#include "show.h"
#include "memalloc.h"
#include "error.h"
#include "init.h"
#include "mystring.h"
#include "exec.h"
#include "cd.h"
#include "shinstance.h"

#define PROFILE 0

/*int rootpid;
int rootshell;*/
#ifdef unused_variables
STATIC union node *curcmd;
STATIC union node *prevcmd;
#endif

STATIC void read_profile(struct shinstance *, const char *);
STATIC char *find_dot_file(struct shinstance *, char *);
int main(int, char **, char **);
SH_NORETURN_1 void shell_main(shinstance *, int, char **) SH_NORETURN_2;
#ifdef _MSC_VER
extern void init_syntax(void);
#endif
STATIC int usage(const char *argv0);
STATIC int version(const char *argv0);

/*
 * Main routine.  We initialize things, parse the arguments, execute
 * profiles if we're a login shell, and then call cmdloop to execute
 * commands.  The setjmp call sets up the location to jump to when an
 * exception occurs.  When an exception occurs the variable "state"
 * is used to figure out how far we had gotten.
 */

int
#if K_OS == K_OS_WINDOWS && defined(SH_FORKED_MODE)
real_main(int argc, char **argv, char **envp)
#else
main(int argc, char **argv, char **envp)
#endif
{
        shinstance *psh;

        /*
         * Global initializations.
         */
        setlocale(LC_ALL, "");
#ifdef _MSC_VER
        init_syntax();
#endif

        /*
         * Check for --version and --help.
         */
        if (argc > 1 && argv[1][0] == '-' && argv[1][1] == '-') {
                if (!strcmp(argv[1], "--help"))
                        return usage(argv[0]);
                if (!strcmp(argv[1], "--version"))
                        return version(argv[0]);
        }

        /*
         * Create the root shell instance.
         */
        psh = sh_create_root_shell(argv, envp);
        if (!psh)
                return 2;
        shthread_set_shell(psh);
        shell_main(psh, argc, psh->orgargv);
        /* Not reached. */
        return 89;
}

SH_NORETURN_1 void
shell_main(shinstance *psh, int argc, char **argv)
{
        struct jmploc jmploc;
        struct stackmark smark;
        volatile int state;
        char *shinit;

        state = 0;
        if (setjmp(jmploc.loc)) {
                /*
                 * When a shell procedure is executed, we raise the
                 * exception EXSHELLPROC to clean up before executing
                 * the shell procedure.
                 */
                switch (psh->exception) {
                case EXSHELLPROC:
                        psh->rootpid = /*getpid()*/ psh->pid;
                        psh->rootshell = 1;
                        psh->minusc = NULL;
                        state = 3;
                        break;

                case EXEXEC:
                        psh->exitstatus = psh->exerrno;
                        break;

                case EXERROR:
                        psh->exitstatus = 2;
                        break;

                default:
                        break;
                }

                if (psh->exception != EXSHELLPROC) {
                        if (state == 0 || iflag(psh) == 0 || ! psh->rootshell)
                                exitshell(psh, psh->exitstatus);
                }
                reset(psh);
                if (psh->exception == EXINT
#if ATTY
                 && (! attyset(psh) || equal(termval(psh), "emacs"))
#endif
                 ) {
                        out2c(psh, '\n');
                        flushout(&psh->errout);
                }
                popstackmark(psh, &smark);
                FORCEINTON;                             /* enable interrupts */
                if (state == 1)
                        goto state1;
                else if (state == 2)
                        goto state2;
                else if (state == 3)
                        goto state3;
                else
                        goto state4;
        }
        psh->handler = &jmploc;
        psh->rootpid = /*getpid()*/ psh->pid;
        psh->rootshell = 1;
#ifdef DEBUG
#if DEBUG == 2
        debug(psh) = 1;
#endif
        opentrace(psh);
        trputs(psh, "Shell args:  ");  trargs(psh, argv);
#endif

        init(psh);
        setstackmark(psh, &smark);
        procargs(psh, argc, argv);
        if (argv[0] && argv[0][0] == '-') {
                state = 1;
                read_profile(psh, "/etc/profile");
state1:
                state = 2;
                read_profile(psh, ".profile");
        }
state2:
        state = 3;
        if (sh_getuid(psh) == sh_geteuid(psh) && sh_getgid(psh) == sh_getegid(psh)) {
                if ((shinit = lookupvar(psh, "ENV")) != NULL && *shinit != '\0') {
                        state = 3;
                        read_profile(psh, shinit);
                }
        }
state3:
        state = 4;
        if (sflag(psh) == 0 || psh->minusc) {
                static int sigs[] =  {
                    SIGINT, SIGQUIT, SIGHUP,
#ifdef SIGTSTP
                    SIGTSTP,
#endif
                    SIGPIPE
                };
#define SIGSSIZE (sizeof(sigs)/sizeof(sigs[0]))
                unsigned i;

                for (i = 0; i < SIGSSIZE; i++)
                    setsignal(psh, sigs[i]);
        }

        if (psh->minusc)
                evalstring(psh, psh->minusc, 0);

        if (sflag(psh) || psh->minusc == NULL) {
state4: /* XXX ??? - why isn't this before the "if" statement */
                cmdloop(psh, 1);
        }
        exitshell(psh, psh->exitstatus);
        /* NOTREACHED */
}


/*
 * Read and execute commands.  "Top" is nonzero for the top level command
 * loop; it turns on prompting if the shell is interactive.
 */

void
cmdloop(struct shinstance *psh, int top)
{
        union node *n;
        struct stackmark smark;
        int inter;
        int numeof = 0;

        TRACE((psh, "cmdloop(%d) called\n", top));
        setstackmark(psh, &smark);
        for (;;) {
                if (psh->pendingsigs)
                        dotrap(psh);
                inter = 0;
                if (iflag(psh) && top) {
                        inter = 1;
                        showjobs(psh, psh->out2, SHOW_CHANGED);
                        chkmail(psh, 0);
                        flushout(&psh->errout);
                }
                n = parsecmd(psh, inter);
                /* showtree(n); DEBUG */
                if (n == NEOF) {
                        if (!top || numeof >= 50)
                                break;
                        if (!stoppedjobs(psh)) {
                                if (!Iflag(psh))
                                        break;
                                out2str(psh, "\nUse \"exit\" to leave shell.\n");
                        }
                        numeof++;
                } else if (n != NULL && nflag(psh) == 0) {
                        psh->job_warning = (psh->job_warning == 2) ? 1 : 0;
                        numeof = 0;
                        evaltree(psh, n, 0);
                }
                popstackmark(psh, &smark);
                setstackmark(psh, &smark);
                if (psh->evalskip == SKIPFILE) {
                        psh->evalskip = 0;
                        break;
                }
        }
        popstackmark(psh, &smark);
}



/*
 * Read /etc/profile or .profile.  Return on error.
 */

STATIC void
read_profile(struct shinstance *psh, const char *name)
{
        int fd;
        int xflag_set = 0;
        int vflag_set = 0;

        INTOFF;
        if ((fd = shfile_open(&psh->fdtab, name, O_RDONLY, 0)) >= 0)
                setinputfd(psh, fd, 1);
        INTON;
        if (fd < 0)
                return;
        /* -q turns off -x and -v just when executing init files */
        if (qflag(psh))  {
            if (xflag(psh))
                    xflag(psh) = 0, xflag_set = 1;
            if (vflag(psh))
                    vflag(psh) = 0, vflag_set = 1;
        }
        cmdloop(psh, 0);
        if (qflag(psh))  {
            if (xflag_set)
                    xflag(psh) = 1;
            if (vflag_set)
                    vflag(psh) = 1;
        }
        popfile(psh);
}



/*
 * Read a file containing shell functions.
 */

void
readcmdfile(struct shinstance *psh, char *name)
{
        int fd;

        INTOFF;
        if ((fd = shfile_open(&psh->fdtab, name, O_RDONLY, 0)) >= 0)
                setinputfd(psh, fd, 1);
        else
                error(psh, "Can't open %s", name);
        INTON;
        cmdloop(psh, 0);
        popfile(psh);
}



/*
 * Take commands from a file.  To be compatible we should do a path
 * search for the file, which is necessary to find sub-commands.
 */


STATIC char *
find_dot_file(struct shinstance *psh, char *basename)
{
        char *fullname;
        const char *path = pathval(psh);

        /* don't try this for absolute or relative paths */
        if (strchr(basename, '/'))
                return basename;

        while ((fullname = padvance(psh, &path, basename)) != NULL) {
                if (shfile_stat_isreg(&psh->fdtab, fullname) > 0) {
                        /*
                         * Don't bother freeing here, since it will
                         * be freed by the caller.
                         */
                        return fullname;
                }
                stunalloc(psh, fullname);
        }

        /* not found in the PATH */
        error(psh, "%s: not found", basename);
        /* NOTREACHED */
        return NULL;
}

int
dotcmd(struct shinstance *psh, int argc, char **argv)
{
        psh->exitstatus = 0;

        if (argc >= 2) {                /* That's what SVR2 does */
                char * const savedcommandname = psh->commandname;
                int const savedcommandnamemalloc = psh->commandnamemalloc;
                char *fullname;
                struct stackmark smark;

                setstackmark(psh, &smark);
                fullname = find_dot_file(psh, argv[1]);
                setinputfile(psh, fullname, 1);
                psh->commandname = fullname;
                psh->commandnamemalloc = 0;
                cmdloop(psh, 0);
                popfile(psh);
                psh->commandname = savedcommandname;
                psh->commandnamemalloc = savedcommandnamemalloc;
                popstackmark(psh, &smark);
        }
        return psh->exitstatus;
}


int
exitcmd(struct shinstance *psh, int argc, char **argv)
{
        if (stoppedjobs(psh))
                return 0;
        if (argc > 1)
                psh->exitstatus = number(psh, argv[1]);
        exitshell(psh, psh->exitstatus);
        /* NOTREACHED */
        return 1;
}


STATIC const char *
strip_argv0(const char *argv0, unsigned *lenp)
{
        const char *tmp;

        /* skip the path */
        for (tmp = strpbrk(argv0, "\\/:"); tmp; tmp = strpbrk(argv0, "\\/:"))
                argv0 = tmp + 1;

        /* find the end, ignoring extenions */
        tmp = strrchr(argv0, '.');
        if (!tmp)
                tmp = strchr(argv0, '\0');
        *lenp = (unsigned)(tmp - argv0);
        return argv0;
}

STATIC int
usage(const char *argv0)
{
        unsigned len;
        argv0 = strip_argv0(argv0, &len);

        fprintf(stdout,
                        "usage: %.*s [-aCefnuvxIimqVEb] [+aCefnuvxIimqVEb] [-o option_name]\n"
                    "               [+o option_name] [command_file [argument ...]]\n"
                    "   or: %.*s -c [-aCefnuvxIimqVEb] [+aCefnuvxIimqVEb] [-o option_name]\n"
                    "               [+o option_name] command_string [command_name [argument ...]]\n"
                    "   or: %.*s -s [-aCefnuvxIimqVEb] [+aCefnuvxIimqVEb] [-o option_name]\n"
                    "               [+o option_name] [argument ...]\n"
                    "   or: %.*s --help\n"
                    "   or: %.*s --version\n",
                    len, argv0, len, argv0, len, argv0, len, argv0, len, argv0);
        return 0;
}

STATIC int
version(const char *argv0)
{
        unsigned len;
        strip_argv0(argv0, &len);

        fprintf(stdout,
                        "%.*s - kBuild version %d.%d.%d (r%u)\n",
                    len, argv0,
                    KBUILD_VERSION_MAJOR, KBUILD_VERSION_MINOR, KBUILD_VERSION_PATCH, KBUILD_SVN_REV);
        return 0;
}


/*
 * Local Variables:
 *   c-file-style: bsd
 * End:
 */