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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)getsubopt.c 8.1 (Berkeley) 6/4/93 30 * $FreeBSD: src/lib/libc/stdlib/getsubopt.c,v 1.7 2007/01/09 00:28:10 imp Exp $ 31 * $DragonFly: src/lib/libc/stdlib/getsubopt.c,v 1.4 2005/11/20 12:37:48 swildner Exp $ 32 */ 33 34 #include <stdlib.h> 35 #include <string.h> 36 37 /* 38 * The SVID interface to getsubopt provides no way of figuring out which 39 * part of the suboptions list wasn't matched. This makes error messages 40 * tricky... The extern variable suboptarg is a pointer to the token 41 * which didn't match. 42 */ 43 char *suboptarg; 44 45 int 46 getsubopt(char **optionp, char * const *tokens, char **valuep) 47 { 48 int cnt; 49 char *p; 50 51 suboptarg = *valuep = NULL; 52 53 if (!optionp || !*optionp) 54 return(-1); 55 56 /* skip leading white-space, commas */ 57 for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 58 59 if (!*p) { 60 *optionp = p; 61 return(-1); 62 } 63 64 /* save the start of the token, and skip the rest of the token. */ 65 for (suboptarg = p; 66 *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';); 67 68 if (*p) { 69 /* 70 * If there's an equals sign, set the value pointer, and 71 * skip over the value part of the token. Terminate the 72 * token. 73 */ 74 if (*p == '=') { 75 *p = '\0'; 76 for (*valuep = ++p; 77 *p && *p != ',' && *p != ' ' && *p != '\t'; ++p); 78 if (*p) 79 *p++ = '\0'; 80 } else 81 *p++ = '\0'; 82 /* Skip any whitespace or commas after this token. */ 83 for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 84 } 85 86 /* set optionp for next round. */ 87 *optionp = p; 88 89 for (cnt = 0; *tokens; ++tokens, ++cnt) 90 if (!strcmp(suboptarg, *tokens)) 91 return(cnt); 92 return(-1); 93 } 94