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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 **);
int shell_main(shinstance *, int, char **);
#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
main(int argc, char **argv)
{
      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(NULL, argc, argv);
      if (!psh)
            return 2;
      shthread_set_shell(psh);
      return shell_main(psh, argc, argv);
}

int
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]))
            int i;

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

      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 */
      return 1;
}


/*
 * 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);
      struct stat statb;

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

      while ((fullname = padvance(psh, &path, basename)) != NULL) {
            if ((shfile_stat(&psh->fdtab, fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
                  /*
                   * 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 *fullname;
            struct stackmark smark;

            setstackmark(psh, &smark);
            fullname = find_dot_file(psh, argv[1]);
            setinputfile(psh, fullname, 1);
            psh->commandname = fullname;
            cmdloop(psh, 0);
            popfile(psh);
            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, size_t *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 = tmp - argv0;
      return argv0;
}

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

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


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

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