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getopt.c

/*    $OpenBSD: getopt_long.c,v 1.23 2007/10/31 12:34:57 chl Exp $      */
/*    $NetBSD: getopt_long.c,v 1.15 2002/01/31 22:43:40 tv Exp $  */

/*
 * Copyright (c) 2002 Todd C. Miller <Todd.Miller@courtesan.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Sponsored in part by the Defense Advanced Research Projects
 * Agency (DARPA) and Air Force Research Laboratory, Air Force
 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
 */
/*-
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Dieter Baron and Thomas Klausner.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <errno.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <stdarg.h>
#include <stdio.h>
#include <windows.h>

#define     REPLACE_GETOPT          /* use this getopt as the system getopt(3) */

#ifdef REPLACE_GETOPT
int   opterr = 1;       /* if error message should be printed */
int   optind = 1;       /* index into parent argv vector */
int   optopt = '?';           /* character checked for validity */
int   optreset;         /* reset getopt */
char    *optarg;        /* argument associated with option */
#endif

#define PRINT_ERROR     ((opterr) && (*options != ':'))

#define FLAG_PERMUTE    0x01  /* permute non-options to the end of argv */
#define FLAG_ALLARGS    0x02  /* treat non-options as args to option "-1" */
#define FLAG_LONGONLY   0x04  /* operate as getopt_long_only */

/* return values */
#define     BADCH       (int)'?'
#define     BADARG            ((*options == ':') ? (int)':' : (int)'?')
#define     INORDER     (int)1

#ifndef __CYGWIN__
#define __progname __argv[0]
#else
extern char __declspec(dllimport) *__progname;
#endif

#ifdef __CYGWIN__
static char EMSG[] = "";
#else
#define     EMSG        ""
#endif

static int getopt_internal(int, char * const *, const char *,
                     const struct option *, int *, int);
static int parse_long_options(char * const *, const char *,
                        const struct option *, int *, int);
static int gcd(int, int);
static void permute_args(int, int, int, char * const *);

static char *place = EMSG; /* option letter processing */

/* XXX: set optreset to 1 rather than these two */
static int nonopt_start = -1; /* first non option argument (for permute) */
static int nonopt_end = -1;   /* first option after non options (for permute) */

/* Error messages */
static const char recargchar[] = "option requires an argument -- %c";
static const char recargstring[] = "option requires an argument -- %s";
static const char ambig[] = "ambiguous option -- %.*s";
static const char noarg[] = "option doesn't take an argument -- %.*s";
static const char illoptchar[] = "unknown option -- %c";
static const char illoptstring[] = "unknown option -- %s";

static void
_vwarnx(const char *fmt,va_list ap)
{
  (void)fprintf(stderr,"%s: ",__progname);
  if (fmt != NULL)
    (void)vfprintf(stderr,fmt,ap);
  (void)fprintf(stderr,"\n");
}

static void
warnx(const char *fmt,...)
{
  va_list ap;
  va_start(ap,fmt);
  _vwarnx(fmt,ap);
  va_end(ap);
}

/*
 * Compute the greatest common divisor of a and b.
 */
static int
gcd(int a, int b)
{
      int c;

      c = a % b;
      while (c != 0) {
            a = b;
            b = c;
            c = a % b;
      }

      return (b);
}

/*
 * Exchange the block from nonopt_start to nonopt_end with the block
 * from nonopt_end to opt_end (keeping the same order of arguments
 * in each block).
 */
static void
permute_args(int panonopt_start, int panonopt_end, int opt_end,
      char * const *nargv)
{
      int cstart, cyclelen, i, j, ncycle, nnonopts, nopts, pos;
      char *swap;

      /*
       * compute lengths of blocks and number and size of cycles
       */
      nnonopts = panonopt_end - panonopt_start;
      nopts = opt_end - panonopt_end;
      ncycle = gcd(nnonopts, nopts);
      cyclelen = (opt_end - panonopt_start) / ncycle;

      for (i = 0; i < ncycle; i++) {
            cstart = panonopt_end+i;
            pos = cstart;
            for (j = 0; j < cyclelen; j++) {
                  if (pos >= panonopt_end)
                        pos -= nnonopts;
                  else
                        pos += nopts;
                  swap = nargv[pos];
                  /* LINTED const cast */
                  ((char **) nargv)[pos] = nargv[cstart];
                  /* LINTED const cast */
                  ((char **)nargv)[cstart] = swap;
            }
      }
}

/*
 * parse_long_options --
 *    Parse long options in argc/argv argument vector.
 * Returns -1 if short_too is set and the option does not match long_options.
 */
static int
parse_long_options(char * const *nargv, const char *options,
      const struct option *long_options, int *idx, int short_too)
{
      char *current_argv, *has_equal;
      size_t current_argv_len;
      int i, ambiguous, match;

#define IDENTICAL_INTERPRETATION(_x, _y)                                \
      (long_options[(_x)].has_arg == long_options[(_y)].has_arg &&    \
       long_options[(_x)].flag == long_options[(_y)].flag &&          \
       long_options[(_x)].val == long_options[(_y)].val)

      current_argv = place;
      match = -1;
      ambiguous = 0;

      optind++;

      if ((has_equal = strchr(current_argv, '=')) != NULL) {
            /* argument found (--option=arg) */
            current_argv_len = has_equal - current_argv;
            has_equal++;
      } else
            current_argv_len = strlen(current_argv);

      for (i = 0; long_options[i].name; i++) {
            /* find matching long option */
            if (strncmp(current_argv, long_options[i].name,
                current_argv_len))
                  continue;

            if (strlen(long_options[i].name) == current_argv_len) {
                  /* exact match */
                  match = i;
                  ambiguous = 0;
                  break;
            }
            /*
             * If this is a known short option, don't allow
             * a partial match of a single character.
             */
            if (short_too && current_argv_len == 1)
                  continue;

            if (match == -1)  /* partial match */
                  match = i;
            else if (!IDENTICAL_INTERPRETATION(i, match))
                  ambiguous = 1;
      }
      if (ambiguous) {
            /* ambiguous abbreviation */
            if (PRINT_ERROR)
                  warnx(ambig, (int)current_argv_len,
                       current_argv);
            optopt = 0;
            return (BADCH);
      }
      if (match != -1) {            /* option found */
            if (long_options[match].has_arg == no_argument
                && has_equal) {
                  if (PRINT_ERROR)
                        warnx(noarg, (int)current_argv_len,
                             current_argv);
                  /*
                   * XXX: GNU sets optopt to val regardless of flag
                   */
                  if (long_options[match].flag == NULL)
                        optopt = long_options[match].val;
                  else
                        optopt = 0;
                  return (BADARG);
            }
            if (long_options[match].has_arg == required_argument ||
                long_options[match].has_arg == optional_argument) {
                  if (has_equal)
                        optarg = has_equal;
                  else if (long_options[match].has_arg ==
                      required_argument) {
                        /*
                         * optional argument doesn't use next nargv
                         */
                        optarg = nargv[optind++];
                  }
            }
            if ((long_options[match].has_arg == required_argument)
                && (optarg == NULL)) {
                  /*
                   * Missing argument; leading ':' indicates no error
                   * should be generated.
                   */
                  if (PRINT_ERROR)
                        warnx(recargstring,
                            current_argv);
                  /*
                   * XXX: GNU sets optopt to val regardless of flag
                   */
                  if (long_options[match].flag == NULL)
                        optopt = long_options[match].val;
                  else
                        optopt = 0;
                  --optind;
                  return (BADARG);
            }
      } else {                /* unknown option */
            if (short_too) {
                  --optind;
                  return (-1);
            }
            if (PRINT_ERROR)
                  warnx(illoptstring, current_argv);
            optopt = 0;
            return (BADCH);
      }
      if (idx)
            *idx = match;
      if (long_options[match].flag) {
            *long_options[match].flag = long_options[match].val;
            return (0);
      } else
            return (long_options[match].val);
#undef IDENTICAL_INTERPRETATION
}

/*
 * getopt_internal --
 *    Parse argc/argv argument vector.  Called by user level routines.
 */
static int
getopt_internal(int nargc, char * const *nargv, const char *options,
      const struct option *long_options, int *idx, int flags)
{
      char *oli;                    /* option letter list index */
      int optchar, short_too;
      static int posixly_correct = -1;

      if (options == NULL)
            return (-1);

      /*
       * XXX Some GNU programs (like cvs) set optind to 0 instead of
       * XXX using optreset.  Work around this braindamage.
       */
      if (optind == 0)
            optind = optreset = 1;

      /*
       * Disable GNU extensions if POSIXLY_CORRECT is set or options
       * string begins with a '+'.
       *
       * CV, 2009-12-14: Check POSIXLY_CORRECT anew if optind == 0 or
       *                 optreset != 0 for GNU compatibility.
       */
      if (posixly_correct == -1 || optreset != 0)
            posixly_correct = (getenv("POSIXLY_CORRECT") != NULL);
      if (*options == '-')
            flags |= FLAG_ALLARGS;
      else if (posixly_correct || *options == '+')
            flags &= ~FLAG_PERMUTE;
      if (*options == '+' || *options == '-')
            options++;

      optarg = NULL;
      if (optreset)
            nonopt_start = nonopt_end = -1;
start:
      if (optreset || !*place) {          /* update scanning pointer */
            optreset = 0;
            if (optind >= nargc) {          /* end of argument vector */
                  place = EMSG;
                  if (nonopt_end != -1) {
                        /* do permutation, if we have to */
                        permute_args(nonopt_start, nonopt_end,
                            optind, nargv);
                        optind -= nonopt_end - nonopt_start;
                  }
                  else if (nonopt_start != -1) {
                        /*
                         * If we skipped non-options, set optind
                         * to the first of them.
                         */
                        optind = nonopt_start;
                  }
                  nonopt_start = nonopt_end = -1;
                  return (-1);
            }
            if (*(place = nargv[optind]) != '-' ||
                (place[1] == '\0' && strchr(options, '-') == NULL)) {
                  place = EMSG;           /* found non-option */
                  if (flags & FLAG_ALLARGS) {
                        /*
                         * GNU extension:
                         * return non-option as argument to option 1
                         */
                        optarg = nargv[optind++];
                        return (INORDER);
                  }
                  if (!(flags & FLAG_PERMUTE)) {
                        /*
                         * If no permutation wanted, stop parsing
                         * at first non-option.
                         */
                        return (-1);
                  }
                  /* do permutation */
                  if (nonopt_start == -1)
                        nonopt_start = optind;
                  else if (nonopt_end != -1) {
                        permute_args(nonopt_start, nonopt_end,
                            optind, nargv);
                        nonopt_start = optind -
                            (nonopt_end - nonopt_start);
                        nonopt_end = -1;
                  }
                  optind++;
                  /* process next argument */
                  goto start;
            }
            if (nonopt_start != -1 && nonopt_end == -1)
                  nonopt_end = optind;

            /*
             * If we have "-" do nothing, if "--" we are done.
             */
            if (place[1] != '\0' && *++place == '-' && place[1] == '\0') {
                  optind++;
                  place = EMSG;
                  /*
                   * We found an option (--), so if we skipped
                   * non-options, we have to permute.
                   */
                  if (nonopt_end != -1) {
                        permute_args(nonopt_start, nonopt_end,
                            optind, nargv);
                        optind -= nonopt_end - nonopt_start;
                  }
                  nonopt_start = nonopt_end = -1;
                  return (-1);
            }
      }

      /*
       * Check long options if:
       *  1) we were passed some
       *  2) the arg is not just "-"
       *  3) either the arg starts with -- we are getopt_long_only()
       */
      if (long_options != NULL && place != nargv[optind] &&
          (*place == '-' || (flags & FLAG_LONGONLY))) {
            short_too = 0;
            if (*place == '-')
                  place++;          /* --foo long option */
            else if (*place != ':' && strchr(options, *place) != NULL)
                  short_too = 1;          /* could be short option too */

            optchar = parse_long_options(nargv, options, long_options,
                idx, short_too);
            if (optchar != -1) {
                  place = EMSG;
                  return (optchar);
            }
      }

      if ((optchar = (int)*place++) == (int)':' ||
          (optchar == (int)'-' && *place != '\0') ||
          (oli = strchr(options, optchar)) == NULL) {
            /*
             * If the user specified "-" and  '-' isn't listed in
             * options, return -1 (non-option) as per POSIX.
             * Otherwise, it is an unknown option character (or ':').
             */
            if (optchar == (int)'-' && *place == '\0')
                  return (-1);
            if (!*place)
                  ++optind;
            if (PRINT_ERROR)
                  warnx(illoptchar, optchar);
            optopt = optchar;
            return (BADCH);
      }
      if (long_options != NULL && optchar == 'W' && oli[1] == ';') {
            /* -W long-option */
            if (*place)             /* no space */
                  /* NOTHING */;
            else if (++optind >= nargc) { /* no arg */
                  place = EMSG;
                  if (PRINT_ERROR)
                        warnx(recargchar, optchar);
                  optopt = optchar;
                  return (BADARG);
            } else                        /* white space */
                  place = nargv[optind];
            optchar = parse_long_options(nargv, options, long_options,
                idx, 0);
            place = EMSG;
            return (optchar);
      }
      if (*++oli != ':') {                /* doesn't take argument */
            if (!*place)
                  ++optind;
      } else {                      /* takes (optional) argument */
            optarg = NULL;
            if (*place)             /* no white space */
                  optarg = place;
            else if (oli[1] != ':') {     /* arg not optional */
                  if (++optind >= nargc) {      /* no arg */
                        place = EMSG;
                        if (PRINT_ERROR)
                              warnx(recargchar, optchar);
                        optopt = optchar;
                        return (BADARG);
                  } else
                        optarg = nargv[optind];
            }
            place = EMSG;
            ++optind;
      }
      /* dump back option letter */
      return (optchar);
}

#ifdef REPLACE_GETOPT
/*
 * getopt --
 *    Parse argc/argv argument vector.
 *
 * [eventually this will replace the BSD getopt]
 */
int
getopt(int nargc, char * const *nargv, const char *options)
{

      /*
       * We don't pass FLAG_PERMUTE to getopt_internal() since
       * the BSD getopt(3) (unlike GNU) has never done this.
       *
       * Furthermore, since many privileged programs call getopt()
       * before dropping privileges it makes sense to keep things
       * as simple (and bug-free) as possible.
       */
      return (getopt_internal(nargc, nargv, options, NULL, NULL, 0));
}
#endif /* REPLACE_GETOPT */

/*
 * getopt_long --
 *    Parse argc/argv argument vector.
 */
int
getopt_long(int nargc, char * const *nargv, const char *options,
    const struct option *long_options, int *idx)
{

      return (getopt_internal(nargc, nargv, options, long_options, idx,
          FLAG_PERMUTE));
}

/*
 * getopt_long_only --
 *    Parse argc/argv argument vector.
 */
int
getopt_long_only(int nargc, char * const *nargv, const char *options,
    const struct option *long_options, int *idx)
{

      return (getopt_internal(nargc, nargv, options, long_options, idx,
          FLAG_PERMUTE|FLAG_LONGONLY));
}

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