text: /*	$Id: getopt_long.c,v 1.1 2009/10/16 19:50:28 rodney Exp rodney $	*/
  /*	$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.
   */
  
  #ifndef lint
  static const char rcsid[]="$Id: getopt_long.c,v 1.1 2009/10/16 19:50:28 rodney Exp rodney $";
  #endif /* lint */
  /*-
   * 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.
   */
  
  #if 0
  #include <err.h>
  #endif
  #include <errno.h>
  #include <getopt.h>
  #include <stdlib.h>
  #include <string.h>
  
  #ifdef _WIN32
  
  /* Windows needs warnx().  We change the definition though:
   *  1. (another) global is defined, opterrmsg, which holds the error message
   *  2. errors are always printed out on stderr w/o the program name
   * Note that opterrmsg always gets set no matter what opterr is set to.  The
   * error message will not be printed if opterr is 0 as usual.
   */
  
  #include <stdio.h>
  #include <stdarg.h>
  #include <stdarg.h>
  
  char opterrmsg[128]; /* last error message is stored here */
  
  static void warnx(const char *fmt, ...)
  {
  	va_list ap;
  	va_start(ap, fmt);
  	if (fmt != NULL)
  		_vsnprintf(opterrmsg, 128, fmt, ap);
  	else
  		opterrmsg[0]='\0';
  	va_end(ap);
  	fprintf(stderr, opterrmsg);
  	fprintf(stderr, "\n");
  }
  
  #endif /*_WIN32*/
  
  #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
  
  #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);
  
  	/*
  	 * Disable GNU extensions if POSIXLY_CORRECT is set or options
  	 * string begins with a '+'.
  	 */
  	if (posixly_correct == -1)
  		posixly_correct = (getenv("POSIXLY_CORRECT") != NULL);
  	if (posixly_correct || *options == '+')
  		flags &= ~FLAG_PERMUTE;
  	else if (*options == '-')
  		flags |= FLAG_ALLARGS;
  	if (*options == '+' || *options == '-')
  		options++;
  
  	/*
  	 * 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;
  
  	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));
  }
  