getsubopt.c revision 92889
11573Srgrimes/*- 21573Srgrimes * Copyright (c) 1990, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * Redistribution and use in source and binary forms, with or without 61573Srgrimes * modification, are permitted provided that the following conditions 71573Srgrimes * are met: 81573Srgrimes * 1. Redistributions of source code must retain the above copyright 91573Srgrimes * notice, this list of conditions and the following disclaimer. 101573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111573Srgrimes * notice, this list of conditions and the following disclaimer in the 121573Srgrimes * documentation and/or other materials provided with the distribution. 131573Srgrimes * 3. All advertising materials mentioning features or use of this software 141573Srgrimes * must display the following acknowledgement: 151573Srgrimes * This product includes software developed by the University of 161573Srgrimes * California, Berkeley and its contributors. 171573Srgrimes * 4. Neither the name of the University nor the names of its contributors 181573Srgrimes * may be used to endorse or promote products derived from this software 191573Srgrimes * without specific prior written permission. 201573Srgrimes * 211573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311573Srgrimes * SUCH DAMAGE. 321573Srgrimes */ 331573Srgrimes 3492889Sobrien#if defined(LIBC_SCCS) && !defined(lint) 351573Srgrimesstatic char sccsid[] = "@(#)getsubopt.c 8.1 (Berkeley) 6/4/93"; 3692889Sobrien#endif /* LIBC_SCCS and not lint */ 3792889Sobrien#include <sys/cdefs.h> 3892889Sobrien__FBSDID("$FreeBSD: head/lib/libc/stdlib/getsubopt.c 92889 2002-03-21 18:49:23Z obrien $"); 391573Srgrimes 401573Srgrimes#include <unistd.h> 411573Srgrimes#include <stdlib.h> 421573Srgrimes 431573Srgrimes/* 441573Srgrimes * The SVID interface to getsubopt provides no way of figuring out which 451573Srgrimes * part of the suboptions list wasn't matched. This makes error messages 461573Srgrimes * tricky... The extern variable suboptarg is a pointer to the token 471573Srgrimes * which didn't match. 481573Srgrimes */ 491573Srgrimeschar *suboptarg; 501573Srgrimes 5117141Sjkhint 521573Srgrimesgetsubopt(optionp, tokens, valuep) 5392889Sobrien char **optionp, **valuep; 5492889Sobrien char * const *tokens; 551573Srgrimes{ 5692889Sobrien int cnt; 5792889Sobrien char *p; 581573Srgrimes 591573Srgrimes suboptarg = *valuep = NULL; 601573Srgrimes 611573Srgrimes if (!optionp || !*optionp) 621573Srgrimes return(-1); 631573Srgrimes 641573Srgrimes /* skip leading white-space, commas */ 651573Srgrimes for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 661573Srgrimes 671573Srgrimes if (!*p) { 681573Srgrimes *optionp = p; 691573Srgrimes return(-1); 701573Srgrimes } 711573Srgrimes 721573Srgrimes /* save the start of the token, and skip the rest of the token. */ 731573Srgrimes for (suboptarg = p; 741573Srgrimes *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';); 751573Srgrimes 761573Srgrimes if (*p) { 771573Srgrimes /* 781573Srgrimes * If there's an equals sign, set the value pointer, and 791573Srgrimes * skip over the value part of the token. Terminate the 801573Srgrimes * token. 811573Srgrimes */ 821573Srgrimes if (*p == '=') { 831573Srgrimes *p = '\0'; 841573Srgrimes for (*valuep = ++p; 851573Srgrimes *p && *p != ',' && *p != ' ' && *p != '\t'; ++p); 868870Srgrimes if (*p) 871573Srgrimes *p++ = '\0'; 881573Srgrimes } else 891573Srgrimes *p++ = '\0'; 901573Srgrimes /* Skip any whitespace or commas after this token. */ 911573Srgrimes for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 921573Srgrimes } 931573Srgrimes 941573Srgrimes /* set optionp for next round. */ 951573Srgrimes *optionp = p; 961573Srgrimes 971573Srgrimes for (cnt = 0; *tokens; ++tokens, ++cnt) 981573Srgrimes if (!strcmp(suboptarg, *tokens)) 991573Srgrimes return(cnt); 1001573Srgrimes return(-1); 1011573Srgrimes} 102