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Commit	Line	Data
	1	/*-
	2	* Copyright (c) 1990, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 4. Neither the name of the University nor the names of its contributors
	14	* may be used to endorse or promote products derived from this software
	15	* without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*/
	29
	30	#if defined(LIBC_SCCS) && !defined(lint)
	31	static char sccsid[] = "@(#)getsubopt.c 8.1 (Berkeley) 6/4/93";
	32	#endif /* LIBC_SCCS and not lint */
	33	#include <sys/cdefs.h>
	34	__FBSDID("$FreeBSD: src/lib/libc/stdlib/getsubopt.c,v 1.7 2007/01/09 00:28:10 imp Exp $");
	35
	36	#include <stdlib.h>
	37	#include <string.h>
	38
	39	/*
	40	* The SVID interface to getsubopt provides no way of figuring out which
	41	* part of the suboptions list wasn't matched. This makes error messages
	42	* tricky... The extern variable suboptarg is a pointer to the token
	43	* which didn't match.
	44	*/
	45	char *suboptarg;
	46
	47	int
	48	getsubopt(optionp, tokens, valuep)
	49	char optionp, valuep;
	50	char * const *tokens;
	51	{
	52	int cnt;
	53	char *p;
	54
	55	suboptarg = *valuep = NULL;
	56
	57	if (!optionp \|\| !*optionp)
	58	return(-1);
	59
	60	/* skip leading white-space, commas */
	61	for (p = optionp; p && (p == ',' \|\| p == ' ' \|\| *p == '\t'); ++p);
	62
	63	if (!*p) {
	64	*optionp = p;
	65	return(-1);
	66	}
	67
	68	/* save the start of the token, and skip the rest of the token. */
	69	for (suboptarg = p;
	70	++p && p != ',' && p != '=' && p != ' ' && *p != '\t';);
	71
	72	if (*p) {
	73	/*
	74	* If there's an equals sign, set the value pointer, and
	75	* skip over the value part of the token. Terminate the
	76	* token.
	77	*/
	78	if (*p == '=') {
	79	*p = '\0';
	80	for (*valuep = ++p;
	81	p && p != ',' && p != ' ' && p != '\t'; ++p);
	82	if (*p)
	83	*p++ = '\0';
	84	} else
	85	*p++ = '\0';
	86	/* Skip any whitespace or commas after this token. */
	87	for (; p && (p == ',' \|\| p == ' ' \|\| p == '\t'); ++p);
	88	}
	89
	90	/* set optionp for next round. */
	91	*optionp = p;
	92
	93	for (cnt = 0; *tokens; ++tokens, ++cnt)
	94	if (!strcmp(suboptarg, *tokens))
	95	return(cnt);
	96	return(-1);
	97	}