getopt_long.c

/*
 * getopt_long() -- long options parser
 *
 * Portions Copyright (c) 1987, 1993, 1994
 * The Regents of the University of California.  All rights reserved.
 *
 * Portions Copyright (c) 2003
 * PostgreSQL Global Development Group
 *
 * 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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 "config.h"

#ifndef HAVE_GETOPT_LONG

#include "getopt_long.h"

#include <stdio.h>
#include <string.h>
#include <unistd.h>

#define BADCH  '?'
#define BADARG ':'
#define EMSG   ""

int
getopt_long(int argc, char *const argv[],
            const char *optstring,
            const struct option * longopts, int *longindex)
{
	static char *place = EMSG; /* option letter processing */
	char        *oli;          /* option letter list index */

	if (!*place)
	{ /* update scanning pointer */
		if (optind >= argc)
		{
			place = EMSG;
			return -1;
		}

		place = argv[optind];

		if (place[0] != '-')
		{
			place = EMSG;
			return -1;
		}

		place++;

		if (place[0] && place[0] == '-' && place[1] == '\0')
		{ /* found "--" */
			++optind;
			place = EMSG;
			return -1;
		}

		if (place[0] && place[0] == '-' && place[1])
		{
			/* long option */
			size_t namelen;
			int    i;

			place++;

			namelen = strcspn(place, "=");
			for (i = 0; longopts[i].name != NULL; i++)
			{
				if (strlen(longopts[i].name) == namelen
					&& strncmp(place, longopts[i].name, namelen) == 0)
				{
					if (longopts[i].has_arg)
					{
						if (place[namelen] == '=')
							optarg = place + namelen + 1;
						else if (optind < argc - 1)
						{
							optind++;
							optarg = argv[optind];
						}
						else
						{
							if (optstring[0] == ':')
								return BADARG;
							if (opterr)
								fprintf(stderr,
									"%s: option requires an argument -- %s\n",
									argv[0], place);
							place = EMSG;
							optind++;
							return BADCH;
						}
					}
					else
					{
						optarg = NULL;
						if (place[namelen] != 0)
						{
							/* XXX error? */
						}
					}

					optind++;

					if (longindex)
						*longindex = i;

					place = EMSG;

					if (longopts[i].flag == NULL)
						return longopts[i].val;
					else
					{
						*longopts[i].flag = longopts[i].val;
						return 0;
					}
				}
			}

			if (opterr && optstring[0] != ':')
				fprintf(stderr,
					"%s: illegal option -- %s\n", argv[0], place);
			place = EMSG;
			optind++;
			return BADCH;
		}
	}

	/* short option */
	optopt = (int) *place++;

	oli = strchr(optstring, optopt);
	if (!oli)
	{
		if (!*place)
			++optind;
		if (opterr && *optstring != ':')
			fprintf(stderr,
				"%s: illegal option -- %c\n", argv[0], optopt);
		return BADCH;
	}

	if (oli[1] != ':')
	{ /* don't need argument */
		optarg = NULL;
		if (!*place)
			++optind;
	}
	else
	{ /* need an argument */
		if (*place) /* no white space */
			optarg = place;
		else if (argc <= ++optind)
		{ /* no arg */
			place = EMSG;
			if (*optstring == ':')
				return BADARG;
			if (opterr)
				fprintf(stderr,
					"%s: option requires an argument -- %c\n",
					argv[0], optopt);
			return BADCH;
		}
		else
			/* white space */
			optarg = argv[optind];
		place = EMSG;
		++optind;
	}
	return optopt;
}

#endif /* HAVE_GETOPT_LONG */