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