/*  $OpenBSD: getopt_long.c,v 1.25 2011/03/05 22:10:11 guenther 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.

 */

/* OPENBSD ORIGINAL: lib/libc/stdlib/getopt_long.c */

#include "includes.h"

#if !defined(HAVE_GETOPT) || !defined(HAVE_GETOPT_OPTRESET)

/*

 * Some defines to make it easier to keep the code in sync with upstream.

 * getopt opterr optind optopt optreset optarg are all in defines.h which is

 * pulled in by includes.h.

 */

#define warnx   logit

#if 0

#include <err.h>

#include <getopt.h>

#endif

#include <errno.h>

#include <stdlib.h>

#include <string.h>

#include <stdarg.h>

#include "log.h"

struct option {

  /* name of long option */

  const char *name;

  /*

   * one of no_argument, required_argument, and optional_argument:

   * whether option takes an argument

   */

  int has_arg;

  /* if not NULL, set *flag to val when option found */

  int *flag;

  /* if flag not NULL, value to set *flag to; else return value */

  int val;

};

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 */

#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

#define EMSG    ""

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";

/*

 * 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, match;

  current_argv = place;

  match = -1;

  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;

      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 {

      /* 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);

}

/*

 * 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 '+'.

   */

  if (posixly_correct == -1 || optreset)

    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);

}

/*

 * 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));

}

#if 0

/*

 * 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));

}

#endif

#endif /* !defined(HAVE_GETOPT) || !defined(HAVE_OPTRESET) */