1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $DragonFly: src/lib/libc/stdlib/getsubopt.c,v 1.3 2003/09/06 08:10:46 asmodai Exp $ 34 * 35 * @(#)getsubopt.c 8.1 (Berkeley) 6/4/93 36 */ 37 38 #include <unistd.h> 39 #include <stdlib.h> 40 41 /* 42 * The SVID interface to getsubopt provides no way of figuring out which 43 * part of the suboptions list wasn't matched. This makes error messages 44 * tricky... The extern variable suboptarg is a pointer to the token 45 * which didn't match. 46 */ 47 char *suboptarg; 48 49 int 50 getsubopt(optionp, tokens, valuep) 51 char **optionp, **valuep; 52 char * const *tokens; 53 { 54 int cnt; 55 char *p; 56 57 suboptarg = *valuep = NULL; 58 59 if (!optionp || !*optionp) 60 return(-1); 61 62 /* skip leading white-space, commas */ 63 for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 64 65 if (!*p) { 66 *optionp = p; 67 return(-1); 68 } 69 70 /* save the start of the token, and skip the rest of the token. */ 71 for (suboptarg = p; 72 *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';); 73 74 if (*p) { 75 /* 76 * If there's an equals sign, set the value pointer, and 77 * skip over the value part of the token. Terminate the 78 * token. 79 */ 80 if (*p == '=') { 81 *p = '\0'; 82 for (*valuep = ++p; 83 *p && *p != ',' && *p != ' ' && *p != '\t'; ++p); 84 if (*p) 85 *p++ = '\0'; 86 } else 87 *p++ = '\0'; 88 /* Skip any whitespace or commas after this token. */ 89 for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 90 } 91 92 /* set optionp for next round. */ 93 *optionp = p; 94 95 for (cnt = 0; *tokens; ++tokens, ++cnt) 96 if (!strcmp(suboptarg, *tokens)) 97 return(cnt); 98 return(-1); 99 } 100