1 /* $OpenBSD: getsubopt.c,v 1.2 2003/06/02 20:18:37 millert 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 #ifndef lint 33 #if 0 34 static char sccsid[] = "@(#)getsubopt.c 8.1 (Berkeley) 6/4/93"; 35 #else 36 static char rcsid[] = "$OpenBSD: getsubopt.c,v 1.2 2003/06/02 20:18:37 millert Exp $"; 37 #endif 38 #endif /* not lint */ 39 40 #include <unistd.h> 41 #include <stdlib.h> 42 #include <string.h> 43 44 /* 45 * The SVID interface to getsubopt provides no way of figuring out which 46 * part of the suboptions list wasn't matched. This makes error messages 47 * tricky... The extern variable suboptarg is a pointer to the token 48 * which didn't match. 49 */ 50 char *suboptarg; 51 52 int 53 getsubopt(optionp, tokens, valuep) 54 register char **optionp, **valuep; 55 register char * const *tokens; 56 { 57 register int cnt; 58 register char *p; 59 60 suboptarg = *valuep = NULL; 61 62 if (!optionp || !*optionp) 63 return(-1); 64 65 /* skip leading white-space, commas */ 66 for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 67 68 if (!*p) { 69 *optionp = p; 70 return(-1); 71 } 72 73 /* save the start of the token, and skip the rest of the token. */ 74 for (suboptarg = p; 75 *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';); 76 77 if (*p) { 78 /* 79 * If there's an equals sign, set the value pointer, and 80 * skip over the value part of the token. Terminate the 81 * token. 82 */ 83 if (*p == '=') { 84 *p = '\0'; 85 for (*valuep = ++p; 86 *p && *p != ',' && *p != ' ' && *p != '\t'; ++p); 87 if (*p) 88 *p++ = '\0'; 89 } else 90 *p++ = '\0'; 91 /* Skip any whitespace or commas after this token. */ 92 for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 93 } 94 95 /* set optionp for next round. */ 96 *optionp = p; 97 98 for (cnt = 0; *tokens; ++tokens, ++cnt) 99 if (!strcmp(suboptarg, *tokens)) 100 return(cnt); 101 return(-1); 102 } 103