1 /* $NetBSD: getsubopt.c,v 1.6 1999/09/20 04:39:37 lukem 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)getsubopt.c 8.1 (Berkeley) 6/4/93"; 40 #else 41 __RCSID("$NetBSD: getsubopt.c,v 1.6 1999/09/20 04:39:37 lukem Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include <assert.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 /* 51 * The SVID interface to getsubopt provides no way of figuring out which 52 * part of the suboptions list wasn't matched. This makes error messages 53 * tricky... The extern variable suboptarg is a pointer to the token 54 * which didn't match. 55 */ 56 char *suboptarg; 57 58 int 59 getsubopt(optionp, tokens, valuep) 60 char **optionp, **valuep; 61 char * const *tokens; 62 { 63 int cnt; 64 char *p; 65 66 _DIAGASSERT(valuep != NULL); 67 _DIAGASSERT(tokens != NULL); 68 /* optionp is tested below */ 69 70 suboptarg = *valuep = NULL; 71 72 if (!optionp || !*optionp) 73 return(-1); 74 75 /* skip leading white-space, commas */ 76 for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 77 78 if (!*p) { 79 *optionp = p; 80 return(-1); 81 } 82 83 /* save the start of the token, and skip the rest of the token. */ 84 for (suboptarg = p; 85 *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';); 86 87 if (*p) { 88 /* 89 * If there's an equals sign, set the value pointer, and 90 * skip over the value part of the token. Terminate the 91 * token. 92 */ 93 if (*p == '=') { 94 *p = '\0'; 95 for (*valuep = ++p; 96 *p && *p != ',' && *p != ' ' && *p != '\t'; ++p); 97 if (*p) 98 *p++ = '\0'; 99 } else 100 *p++ = '\0'; 101 /* Skip any whitespace or commas after this token. */ 102 for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 103 } 104 105 /* set optionp for next round. */ 106 *optionp = p; 107 108 for (cnt = 0; *tokens; ++tokens, ++cnt) 109 if (!strcmp(suboptarg, *tokens)) 110 return(cnt); 111 return(-1); 112 } 113