1 /* $OpenBSD: getsubopt.c,v 1.4 2005/08/08 08:05:36 espie 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <unistd.h> 33 #include <stdlib.h> 34 #include <string.h> 35 36 /* 37 * The SVID interface to getsubopt provides no way of figuring out which 38 * part of the suboptions list wasn't matched. This makes error messages 39 * tricky... The extern variable suboptarg is a pointer to the token 40 * which didn't match. 41 */ 42 char *suboptarg; 43 44 int 45 getsubopt(char **optionp, char * const *tokens, char **valuep) 46 { 47 int cnt; 48 char *p; 49 50 suboptarg = *valuep = NULL; 51 52 if (!optionp || !*optionp) 53 return(-1); 54 55 /* skip leading white-space, commas */ 56 for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 57 58 if (!*p) { 59 *optionp = p; 60 return(-1); 61 } 62 63 /* save the start of the token, and skip the rest of the token. */ 64 for (suboptarg = p; 65 *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';); 66 67 if (*p) { 68 /* 69 * If there's an equals sign, set the value pointer, and 70 * skip over the value part of the token. Terminate the 71 * token. 72 */ 73 if (*p == '=') { 74 *p = '\0'; 75 for (*valuep = ++p; 76 *p && *p != ',' && *p != ' ' && *p != '\t'; ++p); 77 if (*p) 78 *p++ = '\0'; 79 } else 80 *p++ = '\0'; 81 /* Skip any whitespace or commas after this token. */ 82 for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 83 } 84 85 /* set optionp for next round. */ 86 *optionp = p; 87 88 for (cnt = 0; *tokens; ++tokens, ++cnt) 89 if (!strcmp(suboptarg, *tokens)) 90 return(cnt); 91 return(-1); 92 } 93
