1 /* $NetBSD: getsubopt.c,v 1.7 2003/08/07 16:43:40 agc 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 <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)getsubopt.c 8.1 (Berkeley) 6/4/93"; 36 #else 37 __RCSID("$NetBSD: getsubopt.c,v 1.7 2003/08/07 16:43:40 agc Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include <assert.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <unistd.h> 45 46 /* 47 * The SVID interface to getsubopt provides no way of figuring out which 48 * part of the suboptions list wasn't matched. This makes error messages 49 * tricky... The extern variable suboptarg is a pointer to the token 50 * which didn't match. 51 */ 52 char *suboptarg; 53 54 int 55 getsubopt(optionp, tokens, valuep) 56 char **optionp, **valuep; 57 char * const *tokens; 58 { 59 int cnt; 60 char *p; 61 62 _DIAGASSERT(valuep != NULL); 63 _DIAGASSERT(tokens != NULL); 64 /* optionp is tested below */ 65 66 suboptarg = *valuep = NULL; 67 68 if (!optionp || !*optionp) 69 return(-1); 70 71 /* skip leading white-space, commas */ 72 for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 73 74 if (!*p) { 75 *optionp = p; 76 return(-1); 77 } 78 79 /* save the start of the token, and skip the rest of the token. */ 80 for (suboptarg = p; 81 *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';); 82 83 if (*p) { 84 /* 85 * If there's an equals sign, set the value pointer, and 86 * skip over the value part of the token. Terminate the 87 * token. 88 */ 89 if (*p == '=') { 90 *p = '\0'; 91 for (*valuep = ++p; 92 *p && *p != ',' && *p != ' ' && *p != '\t'; ++p); 93 if (*p) 94 *p++ = '\0'; 95 } else 96 *p++ = '\0'; 97 /* Skip any whitespace or commas after this token. */ 98 for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 99 } 100 101 /* set optionp for next round. */ 102 *optionp = p; 103 104 for (cnt = 0; *tokens; ++tokens, ++cnt) 105 if (!strcmp(suboptarg, *tokens)) 106 return(cnt); 107 return(-1); 108 } 109