1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 <stdlib.h> 33 #include <string.h> 34 35 /* 36 * The SVID interface to getsubopt provides no way of figuring out which 37 * part of the suboptions list wasn't matched. This makes error messages 38 * tricky... The extern variable suboptarg is a pointer to the token 39 * which didn't match. 40 */ 41 char *suboptarg; 42 43 int 44 getsubopt(char **optionp, char * const *tokens, char **valuep) 45 { 46 int cnt; 47 char *p; 48 49 suboptarg = *valuep = NULL; 50 51 if (!optionp || !*optionp) 52 return(-1); 53 54 /* skip leading white-space, commas */ 55 for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 56 57 if (!*p) { 58 *optionp = p; 59 return(-1); 60 } 61 62 /* save the start of the token, and skip the rest of the token. */ 63 for (suboptarg = p; 64 *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';); 65 66 if (*p) { 67 /* 68 * If there's an equals sign, set the value pointer, and 69 * skip over the value part of the token. Terminate the 70 * token. 71 */ 72 if (*p == '=') { 73 *p = '\0'; 74 for (*valuep = ++p; 75 *p && *p != ',' && *p != ' ' && *p != '\t'; ++p); 76 if (*p) 77 *p++ = '\0'; 78 } else 79 *p++ = '\0'; 80 /* Skip any whitespace or commas after this token. */ 81 for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 82 } 83 84 /* set optionp for next round. */ 85 *optionp = p; 86 87 for (cnt = 0; *tokens; ++tokens, ++cnt) 88 if (!strcmp(suboptarg, *tokens)) 89 return(cnt); 90 return(-1); 91 } 92