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getsubopt.c revision 1.1 
      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  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 static char sccsid[] = "@(#)getsubopt.c	8.1 (Berkeley) 6/4/93";
     36 #endif /* not lint */
     37 
     38 #include <unistd.h>
     39 #include <stdlib.h>
     40 
     41 /*
     42  * The SVID interface to getsubopt provides no way of figuring out which
     43  * part of the suboptions list wasn't matched.  This makes error messages
     44  * tricky...  The extern variable suboptarg is a pointer to the token
     45  * which didn't match.
     46  */
     47 char *suboptarg;
     48 
     49 getsubopt(optionp, tokens, valuep)
     50 	register char **optionp, **valuep;
     51 	register char * const *tokens;
     52 {
     53 	register int cnt;
     54 	register char *p;
     55 
     56 	suboptarg = *valuep = NULL;
     57 
     58 	if (!optionp || !*optionp)
     59 		return(-1);
     60 
     61 	/* skip leading white-space, commas */
     62 	for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
     63 
     64 	if (!*p) {
     65 		*optionp = p;
     66 		return(-1);
     67 	}
     68 
     69 	/* save the start of the token, and skip the rest of the token. */
     70 	for (suboptarg = p;
     71 	    *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);
     72 
     73 	if (*p) {
     74 		/*
     75 		 * If there's an equals sign, set the value pointer, and
     76 		 * skip over the value part of the token.  Terminate the
     77 		 * token.
     78 		 */
     79 		if (*p == '=') {
     80 			*p = '\0';
     81 			for (*valuep = ++p;
     82 			    *p && *p != ',' && *p != ' ' && *p != '\t'; ++p);
     83 			if (*p)
     84 				*p++ = '\0';
     85 		} else
     86 			*p++ = '\0';
     87 		/* Skip any whitespace or commas after this token. */
     88 		for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
     89 	}
     90 
     91 	/* set optionp for next round. */
     92 	*optionp = p;
     93 
     94 	for (cnt = 0; *tokens; ++tokens, ++cnt)
     95 		if (!strcmp(suboptarg, *tokens))
     96 			return(cnt);
     97 	return(-1);
     98 }
     99