greenplumn getopt_long 源码

greenplumn getopt_long 代码

文件路径：/src/port/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.
 *
 * src/port/getopt_long.c
 */

#include "c.h"

#include "getopt_long.h"

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


/*
 * getopt_long
 *	Parse argc/argv argument vector, with long options.
 *
 * This implementation does not use optreset.  Instead, we guarantee that
 * it can be restarted on a new argv array after a previous call returned -1,
 * if the caller resets optind to 1 before the first call of the new series.
 * (Internally, this means we must be sure to reset "place" to EMSG before
 * returning -1.)
 */
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)
				{
					int			has_arg = longopts[i].has_arg;

					if (has_arg != no_argument)
					{
						if (place[namelen] == '=')
							optarg = place + namelen + 1;
						else if (optind < argc - 1 &&
								 has_arg == required_argument)
						{
							optind++;
							optarg = argv[optind];
						}
						else
						{
							if (optstring[0] == ':')
								return BADARG;

							if (opterr && has_arg == required_argument)
								fprintf(stderr,
										"%s: option requires an argument -- %s\n",
										argv[0], place);

							place = EMSG;
							optind++;

							if (has_arg == required_argument)
								return BADCH;
							optarg = NULL;
						}
					}
					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;
}

相关信息

greenplumn 源码目录

相关文章

greenplumn chklocale 源码

greenplumn crypt 源码

greenplumn dirent 源码

greenplumn dirmod 源码

greenplumn dlopen 源码

greenplumn erand48 源码

greenplumn fls 源码

greenplumn fseeko 源码

greenplumn getaddrinfo 源码

greenplumn getopt 源码