/*	$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 <getopt.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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 */
#undef optreset   /* see getopt.h */
#define optreset __mingw_optreset
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) {
  const 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));
}
