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 #if defined(LIBC_SCCS) && !defined(lint) 33 static char sccsid[] = "@(#)getsubopt.c 8.1 (Berkeley) 6/4/93"; 34 #endif /* LIBC_SCCS and not lint */ 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <stdlib.h> 39 #include <string.h> 40 41 /* 42 * The SVID interface to getsubopt provides no way of figuring out which 43 * part of the suboptions list wasn't matched. This makes error messages 44 * tricky... The extern variable suboptarg is a pointer to the token 45 * which didn't match. 46 */ 47 char *suboptarg; 48 49 int 50 getsubopt(char **optionp, char * const *tokens, char **valuep) 51 { 52 int cnt; 53 char *p; 54 55 suboptarg = *valuep = NULL; 56 57 if (!optionp || !*optionp) 58 return(-1); 59 60 /* skip leading white-space, commas */ 61 for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 62 63 if (!*p) { 64 *optionp = p; 65 return(-1); 66 } 67 68 /* save the start of the token, and skip the rest of the token. */ 69 for (suboptarg = p; 70 *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';); 71 72 if (*p) { 73 /* 74 * If there's an equals sign, set the value pointer, and 75 * skip over the value part of the token. Terminate the 76 * token. 77 */ 78 if (*p == '=') { 79 *p = '\0'; 80 for (*valuep = ++p; 81 *p && *p != ',' && *p != ' ' && *p != '\t'; ++p); 82 if (*p) 83 *p++ = '\0'; 84 } else 85 *p++ = '\0'; 86 /* Skip any whitespace or commas after this token. */ 87 for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 88 } 89 90 /* set optionp for next round. */ 91 *optionp = p; 92 93 for (cnt = 0; *tokens; ++tokens, ++cnt) 94 if (!strcmp(suboptarg, *tokens)) 95 return(cnt); 96 return(-1); 97 } 98