1 /* $NetBSD: getsubopt.c,v 1.10 2018/08/30 12:06:06 christos 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 #if HAVE_NBTOOL_CONFIG_H 33 #include "nbtool_config.h" 34 #endif 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 1.10 2018/08/30 12:06:06 christos Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "namespace.h" 46 47 #include <assert.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <unistd.h> 51 52 #ifdef __weak_alias 53 __weak_alias(getsubopt,_getsubopt) 54 #endif 55 56 /* 57 * The SVID interface to getsubopt provides no way of figuring out which 58 * part of the suboptions list wasn't matched. This makes error messages 59 * tricky... The extern variable suboptarg is a pointer to the token 60 * which didn't match. 61 */ 62 char *suboptarg; 63 64 int 65 getsubopt(char **optionp, char * const *tokens, char **valuep) 66 { 67 int cnt; 68 char *p; 69 70 _DIAGASSERT(tokens != NULL); 71 _DIAGASSERT(valuep != NULL); 72 /* optionp is tested below */ 73 74 suboptarg = *valuep = NULL; 75 76 if (!optionp || !*optionp) 77 return(-1); 78 79 /* skip leading white-space, commas */ 80 for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 81 82 if (!*p) { 83 *optionp = p; 84 return(-1); 85 } 86 87 /* save the start of the token, and skip the rest of the token. */ 88 for (suboptarg = p; 89 *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';); 90 91 if (*p) { 92 /* 93 * If there's an equals sign, set the value pointer, and 94 * skip over the value part of the token. Terminate the 95 * token. 96 */ 97 if (*p == '=') { 98 *p = '\0'; 99 for (*valuep = ++p; 100 *p && *p != ',' && *p != ' ' && *p != '\t'; ++p); 101 if (*p) 102 *p++ = '\0'; 103 } else 104 *p++ = '\0'; 105 /* Skip any whitespace or commas after this token. */ 106 for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 107 } 108 109 /* set optionp for next round. */ 110 *optionp = p; 111 112 for (cnt = 0; *tokens; ++tokens, ++cnt) 113 if (!strcmp(suboptarg, *tokens)) 114 return(cnt); 115 return(-1); 116 } 117