getsubopt.c revision 108623
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 108623 2003-01-03 23:31:50Z tjr $"); 391573Srgrimes 40108623Stjr#include <stdlib.h> 41108623Stjr#include <string.h> 421573Srgrimes#include <unistd.h> 431573Srgrimes 441573Srgrimes/* 451573Srgrimes * The SVID interface to getsubopt provides no way of figuring out which 461573Srgrimes * part of the suboptions list wasn't matched. This makes error messages 471573Srgrimes * tricky... The extern variable suboptarg is a pointer to the token 481573Srgrimes * which didn't match. 491573Srgrimes */ 501573Srgrimeschar *suboptarg; 511573Srgrimes 5217141Sjkhint 531573Srgrimesgetsubopt(optionp, tokens, valuep) 5492889Sobrien char **optionp, **valuep; 5592889Sobrien char * const *tokens; 561573Srgrimes{ 5792889Sobrien int cnt; 5892889Sobrien char *p; 591573Srgrimes 601573Srgrimes suboptarg = *valuep = NULL; 611573Srgrimes 621573Srgrimes if (!optionp || !*optionp) 631573Srgrimes return(-1); 641573Srgrimes 651573Srgrimes /* skip leading white-space, commas */ 661573Srgrimes for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 671573Srgrimes 681573Srgrimes if (!*p) { 691573Srgrimes *optionp = p; 701573Srgrimes return(-1); 711573Srgrimes } 721573Srgrimes 731573Srgrimes /* save the start of the token, and skip the rest of the token. */ 741573Srgrimes for (suboptarg = p; 751573Srgrimes *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';); 761573Srgrimes 771573Srgrimes if (*p) { 781573Srgrimes /* 791573Srgrimes * If there's an equals sign, set the value pointer, and 801573Srgrimes * skip over the value part of the token. Terminate the 811573Srgrimes * token. 821573Srgrimes */ 831573Srgrimes if (*p == '=') { 841573Srgrimes *p = '\0'; 851573Srgrimes for (*valuep = ++p; 861573Srgrimes *p && *p != ',' && *p != ' ' && *p != '\t'; ++p); 878870Srgrimes if (*p) 881573Srgrimes *p++ = '\0'; 891573Srgrimes } else 901573Srgrimes *p++ = '\0'; 911573Srgrimes /* Skip any whitespace or commas after this token. */ 921573Srgrimes for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 931573Srgrimes } 941573Srgrimes 951573Srgrimes /* set optionp for next round. */ 961573Srgrimes *optionp = p; 971573Srgrimes 981573Srgrimes for (cnt = 0; *tokens; ++tokens, ++cnt) 991573Srgrimes if (!strcmp(suboptarg, *tokens)) 1001573Srgrimes return(cnt); 1011573Srgrimes return(-1); 1021573Srgrimes} 103