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 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char sccsid[] = "@(#)getsubopt.c 8.1 (Berkeley) 6/4/93"; 32 #endif /* LIBC_SCCS and not lint */ 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <stdlib.h> 37 #include <string.h> 38 39 /* 40 * The SVID interface to getsubopt provides no way of figuring out which 41 * part of the suboptions list wasn't matched. This makes error messages 42 * tricky... The extern variable suboptarg is a pointer to the token 43 * which didn't match. 44 */ 45 char *suboptarg; 46 47 int 48 getsubopt(optionp, tokens, valuep) 49 char **optionp, **valuep; 50 char * const *tokens; 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