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options.c

/*    $NetBSD: options.c,v 1.38 2005/03/20 21:38:17 dsl 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
static char sccsid[] = "@(#)options.c     8.2 (Berkeley) 5/4/95";
#else
__RCSID("$NetBSD: options.c,v 1.38 2005/03/20 21:38:17 dsl Exp $");
#endif /* not lint */
#endif

#include <stdlib.h>

#include "shell.h"
#define DEFINE_OPTIONS
#include "options.h"
#undef DEFINE_OPTIONS
#include "nodes.h"      /* for other header files */
#include "eval.h"
#include "jobs.h"
#include "input.h"
#include "output.h"
#include "trap.h"
#include "var.h"
#include "memalloc.h"
#include "error.h"
#include "mystring.h"
#ifndef SMALL
# include "myhistedit.h"
#endif
#include "show.h"
#include "shinstance.h"

//char *arg0;                 /* value of $0 */
//struct shparam shellparam;  /* current positional parameters */
//char **argptr;              /* argument list for builtin commands */
//char *optionarg;            /* set by nextopt (like getopt) */
//char *optptr;               /* used by nextopt */

//char *minusc;               /* argument to -c option */


STATIC void options(shinstance *, int);
STATIC void minus_o(shinstance *, char *, int);
STATIC void setoption(shinstance *, int, int);
STATIC int getopts(shinstance *, char *, char *, char **, char ***, char **);


/*
 * Process the shell command line arguments.
 */

void
procargs(shinstance *psh, int argc, char **argv)
{
      int i;

      psh->argptr = argv;
      if (argc > 0)
            psh->argptr++;
      for (i = 0; i < NOPTS; i++)
            psh->optlist[i].val = 2;
      options(psh, 1);
      if (*psh->argptr == NULL && psh->minusc == NULL)
            sflag(psh) = 1;
      if (iflag(psh) == 2 && sflag(psh) == 1 && shfile_isatty(&psh->fdtab, 0) && shfile_isatty(&psh->fdtab, 1))
            iflag(psh) = 1;
      if (mflag(psh) == 2)
            mflag(psh) = iflag(psh);
      for (i = 0; i < NOPTS; i++)
            if (psh->optlist[i].val == 2)
                  psh->optlist[i].val = 0;
#if DEBUG == 2
      debug(psh) = 1;
#endif
      psh->arg0 = argv[0];
      if (sflag(psh) == 0 && psh->minusc == NULL) {
            psh->commandname = argv[0];
            psh->arg0 = *psh->argptr++;
            setinputfile(psh, psh->arg0, 0);
            psh->commandname = psh->arg0;
      }
      /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
      if (psh->minusc != NULL) {
            if (psh->argptr == NULL || *psh->argptr == NULL)
                  error(psh, "Bad -c option");
            psh->minusc = *psh->argptr++;
            if (*psh->argptr != 0)
                  psh->arg0 = *psh->argptr++;
      }

      psh->shellparam.p = psh->argptr;
      psh->shellparam.reset = 1;
      /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
      while (*psh->argptr) {
            psh->shellparam.nparam++;
            psh->argptr++;
      }
      optschanged(psh);
}


void
optschanged(shinstance *psh)
{
      setinteractive(psh, iflag(psh));
#ifndef SMALL
      histedit(psh);
#endif
      setjobctl(psh, mflag(psh));
}

/*
 * Process shell options.  The global variable argptr contains a pointer
 * to the argument list; we advance it past the options.
 */

STATIC void
options(shinstance *psh, int cmdline)
{
      static char empty[] = "";
      char *p;
      int val;
      int c;

      if (cmdline)
            psh->minusc = NULL;
      while ((p = *psh->argptr) != NULL) {
            psh->argptr++;
            if ((c = *p++) == '-') {
                  val = 1;
                        if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
                                if (!cmdline) {
                                        /* "-" means turn off -x and -v */
                                        if (p[0] == '\0')
                                                xflag(psh) = vflag(psh) = 0;
                                        /* "--" means reset params */
                                        else if (*psh->argptr == NULL)
                                    setparam(psh, psh->argptr);
                                }
                        break;        /* "-" or  "--" terminates options */
                  }
            } else if (c == '+') {
                  val = 0;
            } else {
                  psh->argptr--;
                  break;
            }
            while ((c = *p++) != '\0') {
                  if (c == 'c' && cmdline) {
                        /* command is after shell args*/
                        psh->minusc = empty;
                  } else if (c == 'o') {
                        minus_o(psh, *psh->argptr, val);
                        if (*psh->argptr)
                              psh->argptr++;
                  } else {
                        setoption(psh, c, val);
                  }
            }
      }
}

static void
set_opt_val(shinstance *psh, int i, int val)
{
      int j;
      int flag;

      if (val && (flag = psh->optlist[i].opt_set)) {
            /* some options (eg vi/emacs) are mutually exclusive */
            for (j = 0; j < NOPTS; j++)
                if (psh->optlist[j].opt_set == flag)
                  psh->optlist[j].val = 0;
      }
      psh->optlist[i].val = val;
#ifdef DEBUG
      if (&psh->optlist[i].val == &debug(psh))
            opentrace(psh);
#endif
}

STATIC void
minus_o(shinstance *psh, char *name, int val)
{
      int i;

      if (name == NULL) {
            out1str(psh, "Current option settings\n");
            for (i = 0; i < NOPTS; i++)
                  out1fmt(psh, "%-16s%s\n", psh->optlist[i].name,
                        psh->optlist[i].val ? "on" : "off");
      } else {
            for (i = 0; i < NOPTS; i++)
                  if (equal(name, psh->optlist[i].name)) {
                        set_opt_val(psh, i, val);
                        return;
                  }
            error(psh, "Illegal option -o %s", name);
      }
}


STATIC void
setoption(shinstance *psh, int flag, int val)
{
      int i;

      for (i = 0; i < NOPTS; i++)
            if (psh->optlist[i].letter == flag) {
                  set_opt_val(psh, i, val);
                  return;
            }
      error(psh, "Illegal option -%c", flag);
      /* NOTREACHED */
}



#ifdef mkinit
INCLUDE "options.h"

INIT {
      memcpy(&psh->optlist[0], &ro_optlist[0], sizeof(psh->optlist));
}

SHELLPROC {
      int i;

      for (i = 0; psh->optlist[i].name; i++)
            psh->optlist[i].val = 0;
      optschanged(psh);

}
#endif


/*
 * Set the shell parameters.
 */

void
setparam(shinstance *psh, char **argv)
{
      char **newparam;
      char **ap;
      int nparam;

      for (nparam = 0 ; argv[nparam] ; nparam++)
            continue;
      ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
      while (*argv) {
            *ap++ = savestr(*argv++);
      }
      *ap = NULL;
      freeparam(&psh->shellparam);
      psh->shellparam.malloc = 1;
      psh->shellparam.nparam = nparam;
      psh->shellparam.p = newparam;
      psh->shellparam.optnext = NULL;
}


/*
 * Free the list of positional parameters.
 */

void
freeparam(volatile struct shparam *param)
{
      char **ap;

      if (param->malloc) {
            for (ap = param->p ; *ap ; ap++)
                  ckfree(*ap);
            ckfree(param->p);
      }
}



/*
 * The shift builtin command.
 */

int
shiftcmd(shinstance *psh, int argc, char **argv)
{
      int n;
      char **ap1, **ap2;

      n = 1;
      if (argc > 1)
            n = number(psh, argv[1]);
      if (n > psh->shellparam.nparam)
            error(psh, "can't shift that many");
      INTOFF;
      psh->shellparam.nparam -= n;
      for (ap1 = psh->shellparam.p ; --n >= 0 ; ap1++) {
            if (psh->shellparam.malloc)
                  ckfree(*ap1);
      }
      ap2 = psh->shellparam.p;
      while ((*ap2++ = *ap1++) != NULL);
      psh->shellparam.optnext = NULL;
      INTON;
      return 0;
}



/*
 * The set command builtin.
 */

int
setcmd(shinstance *psh, int argc, char **argv)
{
      if (argc == 1)
            return showvars(psh, 0, 0, 1);
      INTOFF;
      options(psh, 0);
      optschanged(psh);
      if (*psh->argptr != NULL) {
            setparam(psh, psh->argptr);
      }
      INTON;
      return 0;
}


void
getoptsreset(shinstance *psh, const char *value)
{
      if (number(psh, value) == 1) {
            psh->shellparam.optnext = NULL;
            psh->shellparam.reset = 1;
      }
}

/*
 * The getopts builtin.  Shellparam.optnext points to the next argument
 * to be processed.  Shellparam.optptr points to the next character to
 * be processed in the current argument.  If shellparam.optnext is NULL,
 * then it's the first time getopts has been called.
 */

int
getoptscmd(shinstance *psh, int argc, char **argv)
{
      char **optbase;

      if (argc < 3)
            error(psh, "usage: getopts optstring var [arg]");
      else if (argc == 3)
            optbase = psh->shellparam.p;
      else
            optbase = &argv[3];

      if (psh->shellparam.reset == 1) {
            psh->shellparam.optnext = optbase;
            psh->shellparam.optptr = NULL;
            psh->shellparam.reset = 0;
      }

      return getopts(psh, argv[1], argv[2], optbase, &psh->shellparam.optnext,
                   &psh->shellparam.optptr);
}

STATIC int
getopts(shinstance *psh, char *optstr, char *optvar, char **optfirst, char ***optnext, char **optpptr)
{
      char *p, *q;
      char c = '?';
      int done = 0;
      int ind = 0;
      int err = 0;
      char s[12];

      if ((p = *optpptr) == NULL || *p == '\0') {
            /* Current word is done, advance */
            if (*optnext == NULL)
                  return 1;
            p = **optnext;
            if (p == NULL || *p != '-' || *++p == '\0') {
atend:
                  ind = (int)(*optnext - optfirst + 1);
                  *optnext = NULL;
                  p = NULL;
                  done = 1;
                  goto out;
            }
            (*optnext)++;
            if (p[0] == '-' && p[1] == '\0')    /* check for "--" */
                  goto atend;
      }

      c = *p++;
      for (q = optstr; *q != c; ) {
            if (*q == '\0') {
                  if (optstr[0] == ':') {
                        s[0] = c;
                        s[1] = '\0';
                        err |= setvarsafe(psh, "OPTARG", s, 0);
                  } else {
                        outfmt(&psh->errout, "Illegal option -%c\n", c);
                        (void) unsetvar(psh, "OPTARG", 0);
                  }
                  c = '?';
                  goto bad;
            }
            if (*++q == ':')
                  q++;
      }

      if (*++q == ':') {
            if (*p == '\0' && (p = **optnext) == NULL) {
                  if (optstr[0] == ':') {
                        s[0] = c;
                        s[1] = '\0';
                        err |= setvarsafe(psh, "OPTARG", s, 0);
                        c = ':';
                  } else {
                        outfmt(&psh->errout, "No arg for -%c option\n", c);
                        (void) unsetvar(psh, "OPTARG", 0);
                        c = '?';
                  }
                  goto bad;
            }

            if (p == **optnext)
                  (*optnext)++;
            err |= setvarsafe(psh, "OPTARG", p, 0);
            p = NULL;
      } else
            err |= setvarsafe(psh, "OPTARG", "", 0);
      ind = (int)(*optnext - optfirst + 1);
      goto out;

bad:
      ind = 1;
      *optnext = NULL;
      p = NULL;
out:
      *optpptr = p;
      fmtstr(s, sizeof(s), "%d", ind);
      err |= setvarsafe(psh, "OPTIND", s, VNOFUNC);
      s[0] = c;
      s[1] = '\0';
      err |= setvarsafe(psh, optvar, s, 0);
      if (err) {
            *optnext = NULL;
            *optpptr = NULL;
            output_flushall(psh);
            exraise(psh, EXERROR);
      }
      return done;
}

/*
 * XXX - should get rid of.  have all builtins use getopt(3).  the
 * library getopt must have the BSD extension static variable "optreset"
 * otherwise it can't be used within the shell safely.
 *
 * Standard option processing (a la getopt) for builtin routines.  The
 * only argument that is passed to nextopt is the option string; the
 * other arguments are unnecessary.  It return the character, or '\0' on
 * end of input.
 */

int
nextopt(shinstance *psh, const char *optstring)
{
      char *p;
      const char *q;
      char c;

      if ((p = psh->optptr) == NULL || *p == '\0') {
            p = *psh->argptr;
            if (p == NULL || *p != '-' || *++p == '\0')
                  return '\0';
            psh->argptr++;
            if (p[0] == '-' && p[1] == '\0')    /* check for "--" */
                  return '\0';
      }
      c = *p++;
      for (q = optstring ; *q != c ; ) {
            if (*q == '\0')
                  error(psh, "Illegal option -%c", c);
            if (*++q == ':')
                  q++;
      }
      if (*++q == ':') {
            if (*p == '\0' && (p = *psh->argptr++) == NULL)
                  error(psh, "No arg for -%c option", c);
            psh->optionarg = p;
            p = NULL;
      }
      psh->optptr = p;
      return c;
}

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