1 /* $NetBSD: getsubopt.c,v 1.4 1998/02/03 18:44:15 perry 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 1.4 1998/02/03 18:44:15 perry Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 /* 50 * The SVID interface to getsubopt provides no way of figuring out which 51 * part of the suboptions list wasn't matched. This makes error messages 52 * tricky... The extern variable suboptarg is a pointer to the token 53 * which didn't match. 54 */ 55 char *suboptarg; 56 57 int 58 getsubopt(optionp, tokens, valuep) 59 char **optionp, **valuep; 60 char * const *tokens; 61 { 62 int cnt; 63 char *p; 64 65 suboptarg = *valuep = NULL; 66 67 if (!optionp || !*optionp) 68 return(-1); 69 70 /* skip leading white-space, commas */ 71 for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 72 73 if (!*p) { 74 *optionp = p; 75 return(-1); 76 } 77 78 /* save the start of the token, and skip the rest of the token. */ 79 for (suboptarg = p; 80 *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';); 81 82 if (*p) { 83 /* 84 * If there's an equals sign, set the value pointer, and 85 * skip over the value part of the token. Terminate the 86 * token. 87 */ 88 if (*p == '=') { 89 *p = '\0'; 90 for (*valuep = ++p; 91 *p && *p != ',' && *p != ' ' && *p != '\t'; ++p); 92 if (*p) 93 *p++ = '\0'; 94 } else 95 *p++ = '\0'; 96 /* Skip any whitespace or commas after this token. */ 97 for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 98 } 99 100 /* set optionp for next round. */ 101 *optionp = p; 102 103 for (cnt = 0; *tokens; ++tokens, ++cnt) 104 if (!strcmp(suboptarg, *tokens)) 105 return(cnt); 106 return(-1); 107 } 108