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options.c

/*    $NetBSD: options.c,v 1.33 2003/01/22 20:36:04 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. 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.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)options.c     8.2 (Berkeley) 5/4/95";
#else
__RCSID("$NetBSD: options.c,v 1.33 2003/01/22 20:36:04 dsl Exp $");
#endif
#endif /* not lint */

#include <signal.h>
#include <unistd.h>
#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"

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 const char *const optnames[NOPTS] = {
      "errexit",
      "noglob",
      "ignoreeof",
      "interactive",
      "monitor",
      "noexec",
      "stdin",
      "xtrace",
      "verbose",
      "vi",
      "emacs",
      "noclobber",
      "allexport",
      "notify",
      "nounset",
      "quietprofile",
      "nolog",
      "debug",
};

const char optletters[NOPTS] = {
      'e',
      'f',
      'I',
      'i',
      'm',
      'n',
      's',
      'x',
      'v',
      'V',
      'E',
      'C',
      'a',
      'b',
      'u',
      'q',
      0,
      0,
};

char optlist[NOPTS];


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


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

void
procargs(int argc, char **argv)
{
      int i;
      const char *xminusc;
      char **xargv;

      xargv = argv;
      arg0 = xargv[0];
      if (argc > 0)
            xargv++;
      for (i = 0; i < NOPTS; i++)
            optlist[i] = 2;
      argptr = xargv;
      options(1);
      xargv = argptr;
      xminusc = minusc;
      if (*xargv == NULL) {
            if (xminusc)
                  error("-c requires an argument");
            sflag = 1;
      }
      if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
            iflag = 1;
      if (mflag == 2)
            mflag = iflag;
      for (i = 0; i < NOPTS; i++)
            if (optlist[i] == 2)
                  optlist[i] = 0;
#if DEBUG == 2
      debug = 1;
#endif
      /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
      if (xminusc) {
            minusc = *xargv++;
            if (*xargv)
                  goto setarg0;
      } else if (!sflag) {
            setinputfile(*xargv, 0);
setarg0:
            arg0 = *xargv++;
            commandname = arg0;
      }

      shellparam.p = xargv;
      shellparam.optind = 1;
      shellparam.optoff = -1;
      /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
      while (*xargv) {
            shellparam.nparam++;
            xargv++;
      }
      optschanged();
}


void
optschanged(void)
{
#ifdef DEBUG
      opentrace();
#endif
      setinteractive(iflag);
#ifndef SMALL
      histedit();
#endif
      setjobctl(mflag);
}

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

STATIC void
options(int cmdline)
{
      char *p;
      int val;
      int c;

      if (cmdline)
            minusc = NULL;
      while ((p = *argptr) != NULL) {
            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 = vflag = 0;
                                        /* "--" means reset params */
                                        else if (*argptr == NULL)
                                    setparam(argptr);
                                }
                        break;        /* "-" or  "--" terminates options */
                  }
            } else if (c == '+') {
                  val = 0;
            } else {
                  argptr--;
                  break;
            }
            while ((c = *p++) != '\0') {
                  if (c == 'c' && cmdline) {
                        minusc = p; /* command is after shell args*/
                  } else if (c == 'o') {
                        minus_o(*argptr, val);
                        if (*argptr)
                              argptr++;
                  } else {
                        setoption(c, val);
                  }
            }
      }
}

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

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


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

      for (i = 0; i < NOPTS; i++)
            if (optletters[i] == flag) {
                  optlist[i] = val;
                  if (val) {
                        /* #%$ hack for ksh semantics */
                        if (flag == 'V')
                              Eflag = 0;
                        else if (flag == 'E')
                              Vflag = 0;
                  }
                  return;
            }
      error("Illegal option -%c", flag);
      /* NOTREACHED */
}



/*
 * Set the shell parameters.
 */

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

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


/*
 * 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(int argc, char **argv)
{
      int n;
      char **ap1, **ap2;

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



/*
 * The set command builtin.
 */

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


void
getoptsreset(value)
      const char *value;
{
      shellparam.optind = number(value);
      shellparam.optoff = -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(int argc, char **argv)
{
      char **optbase;

      if (argc < 3)
            error("Usage: getopts optstring var [arg]");
      else if (argc == 3) {
            optbase = shellparam.p;
            if (shellparam.optind > shellparam.nparam + 1) {
                  shellparam.optind = 1;
                  shellparam.optoff = -1;
            }
      }
      else {
            optbase = &argv[3];
            if (shellparam.optind > argc - 2) {
                  shellparam.optind = 1;
                  shellparam.optoff = -1;
            }
      }

      return getopts(argv[1], argv[2], optbase, &shellparam.optind,
                   &shellparam.optoff);
}

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

      if (*optind < 1)
            return 1;
      optnext = optfirst + *optind - 1;

      if (*optind <= 1 || *optoff < 0 || strlen(optnext[-1]) < *optoff)
            p = NULL;
      else
            p = optnext[-1] + *optoff;
      if (p == NULL || *p == '\0') {
            /* Current word is done, advance */
            p = *optnext;
            if (p == NULL || *p != '-' || *++p == '\0') {
atend:
                  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("OPTARG", s, 0);
                  } else {
                        outfmt(&errout, "Illegal option -%c\n", c);
                        (void) unsetvar("OPTARG");
                  }
                  c = '?';
                  goto out;
            }
            if (*++q == ':')
                  q++;
      }

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

            if (p == *optnext)
                  optnext++;
            err |= setvarsafe("OPTARG", p, 0);
            p = NULL;
      } else
            err |= setvarsafe("OPTARG", nullstr, 0);

out:
      *optoff = p ? p - *(optnext - 1) : -1;
      *optind = optnext - optfirst + 1;
      fmtstr(s, sizeof(s), "%d", *optind);
      err |= setvarsafe("OPTIND", s, VNOFUNC);
      s[0] = c;
      s[1] = '\0';
      err |= setvarsafe(optvar, s, 0);
      if (err) {
            *optind = 1;
            *optoff = -1;
            flushall();
            exraise(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(const char *optstring)
{
      char *p;
      const char *q;
      char c;

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

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