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/*	$OpenBSD: getopt_long.c,v 1.24 2010/07/22 19:31:53 blambert Exp $	*/

/*	$NetBSD: getopt_long.c,v 1.15 2002/01/31 22:43:40 tv Exp $	*/

/*

 * Copyright (c) 2002 Todd C. Miller 

 *

 * 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 

#include 

#include 

#include 

#include 

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)

				fprintf(stderr, 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)

				fprintf(stderr, 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)

				fprintf(stderr, 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)

			fprintf(stderr, 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)

			fprintf(stderr, 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)

				fprintf(stderr, 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)

					fprintf(stderr, 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));

}

/*

 * 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));

}