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getsubopt.c revision 1.3 
      1 /*	$NetBSD: getsubopt.c,v 1.3 1998/01/31 20:43:48 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #if defined(LIBC_SCCS) && !defined(lint)
     38 #if 0
     39 static char sccsid[] = "@(#)getsubopt.c	8.1 (Berkeley) 6/4/93";
     40 #else
     41 __RCSID("$NetBSD: getsubopt.c,v 1.3 1998/01/31 20:43:48 thorpej Exp $");
     42 #endif
     43 #endif /* LIBC_SCCS and not lint */
     44 
     45 #include <stdlib.h>
     46 #include <string.h>
     47 #include <unistd.h>
     48 
     49 /*
     50  * The SVID interface to getsubopt provides no way of figuring out which
     51  * part of the suboptions list wasn't matched.  This makes error messages
     52  * tricky...  The extern variable suboptarg is a pointer to the token
     53  * which didn't match.
     54  */
     55 char *suboptarg;
     56 
     57 int
     58 getsubopt(optionp, tokens, valuep)
     59 	register char **optionp, **valuep;
     60 	register char * const *tokens;
     61 {
     62 	register int cnt;
     63 	register char *p;
     64 
     65 	suboptarg = *valuep = NULL;
     66 
     67 	if (!optionp || !*optionp)
     68 		return(-1);
     69 
     70 	/* skip leading white-space, commas */
     71 	for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
     72 
     73 	if (!*p) {
     74 		*optionp = p;
     75 		return(-1);
     76 	}
     77 
     78 	/* save the start of the token, and skip the rest of the token. */
     79 	for (suboptarg = p;
     80 	    *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);
     81 
     82 	if (*p) {
     83 		/*
     84 		 * If there's an equals sign, set the value pointer, and
     85 		 * skip over the value part of the token.  Terminate the
     86 		 * token.
     87 		 */
     88 		if (*p == '=') {
     89 			*p = '\0';
     90 			for (*valuep = ++p;
     91 			    *p && *p != ',' && *p != ' ' && *p != '\t'; ++p);
     92 			if (*p)
     93 				*p++ = '\0';
     94 		} else
     95 			*p++ = '\0';
     96 		/* Skip any whitespace or commas after this token. */
     97 		for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
     98 	}
     99 
    100 	/* set optionp for next round. */
    101 	*optionp = p;
    102 
    103 	for (cnt = 0; *tokens; ++tokens, ++cnt)
    104 		if (!strcmp(suboptarg, *tokens))
    105 			return(cnt);
    106 	return(-1);
    107 }
    108