/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8   -*-â
âvi: set et ft=c ts=8 tw=8 fenc=utf-8                                       :viâ
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â Copyright (c) 1990, 1993                                                     â
â      The Regents of the University of California.  All rights reserved.      â
â                                                                              â
â Redistribution and use in source and binary forms, with or without           â
â modification, are permitted provided that the following conditions           â
â are met:                                                                     â
â  1. Redistributions of source code must retain the above copyright           â
â     notice, this list of conditions and the following disclaimer.            â
â  2. Redistributions in binary form must reproduce the above copyright        â
â     notice, this list of conditions and the following disclaimer in the      â
â     documentation and/or other materials provided with the distribution.     â
â  3. Neither the name of the University nor the names of its contributors     â
â     may be used to endorse or promote products derived from this software    â
â     without specific prior written permission.                               â
â                                                                              â
â THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND      â
â ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE        â
â IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE   â
â ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE     â
â FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL   â
â DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS      â
â OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)        â
â HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT   â
â LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY    â
â OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF       â
â SUCH DAMAGE.                                                                 â
ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ*/
#include "libc/str/str.h"
#include "third_party/getopt/getopt.h"
// clang-format off

/*
 * The SVID interface to getsubopt provides no way of figuring out which
 * part of the suboptions list wasn't matched.  This makes error messages
 * tricky...  The extern variable suboptarg is a pointer to the token
 * which didn't match.
 */
char *suboptarg;

int
getsubopt(char **optionp, char * const *tokens, char **valuep)
{
	int cnt;
	char *p;

	suboptarg = *valuep = NULL;

	if (!optionp || !*optionp)
		return(-1);

	/* skip leading white-space, commas */
	for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);

	if (!*p) {
		*optionp = p;
		return(-1);
	}

	/* save the start of the token, and skip the rest of the token. */
	for (suboptarg = p;
	    *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);

	if (*p) {
		/*
		 * If there's an equals sign, set the value pointer, and
		 * skip over the value part of the token.  Terminate the
		 * token.
		 */
		if (*p == '=') {
			*p = '\0';
			for (*valuep = ++p;
			    *p && *p != ',' && *p != ' ' && *p != '\t'; ++p);
			if (*p) 
				*p++ = '\0';
		} else
			*p++ = '\0';
		/* Skip any whitespace or commas after this token. */
		for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
	}

	/* set optionp for next round. */
	*optionp = p;

	for (cnt = 0; *tokens; ++tokens, ++cnt)
		if (!strcmp(suboptarg, *tokens))
			return(cnt);
	return(-1);
}
