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      1 /*	Id: compat_getsubopt.c,v 1.6 2020/06/15 01:37:15 schwarze Exp  */
      2 /*	$OpenBSD: getsubopt.c,v 1.4 2005/08/08 08:05:36 espie Exp $	*/
      3 
      4 /*-
      5  * Copyright (c) 1990, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. Neither the name of the University nor the names of its contributors
     17  *    may be used to endorse or promote products derived from this software
     18  *    without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     30  * SUCH DAMAGE.
     31  */
     32 #include "config.h"
     33 
     34 #include <unistd.h>
     35 #include <stdlib.h>
     36 #include <string.h>
     37 
     38 int
     39 getsubopt(char **optionp, char * const *tokens, char **valuep)
     40 {
     41 	int cnt;
     42 	char *suboptarg;
     43 	char *p;
     44 
     45 	suboptarg = *valuep = NULL;
     46 
     47 	if (!optionp || !*optionp)
     48 		return(-1);
     49 
     50 	/* skip leading white-space, commas */
     51 	for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
     52 
     53 	if (!*p) {
     54 		*optionp = p;
     55 		return(-1);
     56 	}
     57 
     58 	/* save the start of the token, and skip the rest of the token. */
     59 	for (suboptarg = p;
     60 	    *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);
     61 
     62 	if (*p) {
     63 		/*
     64 		 * If there's an equals sign, set the value pointer, and
     65 		 * skip over the value part of the token.  Terminate the
     66 		 * token.
     67 		 */
     68 		if (*p == '=') {
     69 			*p = '\0';
     70 			for (*valuep = ++p;
     71 			    *p && *p != ',' && *p != ' ' && *p != '\t'; ++p);
     72 			if (*p)
     73 				*p++ = '\0';
     74 		} else
     75 			*p++ = '\0';
     76 		/* Skip any whitespace or commas after this token. */
     77 		for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
     78 	}
     79 
     80 	/* set optionp for next round. */
     81 	*optionp = p;
     82 
     83 	for (cnt = 0; *tokens; ++tokens, ++cnt)
     84 		if (!strcmp(suboptarg, *tokens))
     85 			return(cnt);
     86 	return(-1);
     87 }
     88