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 #ifndef lint 35 static char sccsid[] = "@(#)getsubopt.c 8.1 (Berkeley) 6/4/93"; 36 #endif /* not lint */ 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 getsubopt(optionp, tokens, valuep) 50 register char **optionp, **valuep; 51 register char * const *tokens; 52 { 53 register int cnt; 54 register char *p; 55 56 suboptarg = *valuep = NULL; 57 58 if (!optionp || !*optionp) 59 return(-1); 60 61 /* skip leading white-space, commas */ 62 for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 63 64 if (!*p) { 65 *optionp = p; 66 return(-1); 67 } 68 69 /* save the start of the token, and skip the rest of the token. */ 70 for (suboptarg = p; 71 *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';); 72 73 if (*p) { 74 /* 75 * If there's an equals sign, set the value pointer, and 76 * skip over the value part of the token. Terminate the 77 * token. 78 */ 79 if (*p == '=') { 80 *p = '\0'; 81 for (*valuep = ++p; 82 *p && *p != ',' && *p != ' ' && *p != '\t'; ++p); 83 if (*p) 84 *p++ = '\0'; 85 } else 86 *p++ = '\0'; 87 /* Skip any whitespace or commas after this token. */ 88 for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); 89 } 90 91 /* set optionp for next round. */ 92 *optionp = p; 93 94 for (cnt = 0; *tokens; ++tokens, ++cnt) 95 if (!strcmp(suboptarg, *tokens)) 96 return(cnt); 97 return(-1); 98 } 99