| /* $OpenBSD: getsubopt.c,v 1.4 2005/08/08 08:05:36 espie Exp $ */ |
| |
| /*- |
| * Copyright (c) 1990, 1993 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the University nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include <unistd.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| /* |
| * The SVID interface to getsubopt provides no way of figuring out which |
| * part of the suboptions list wasn't matched. This makes error messages |
| * tricky... The extern variable suboptarg is a pointer to the token |
| * which didn't match. |
| */ |
| char *suboptarg; |
| |
| int |
| getsubopt(char **optionp, char * const *tokens, char **valuep) |
| { |
| int cnt; |
| char *p; |
| |
| suboptarg = *valuep = NULL; |
| |
| if (!optionp || !*optionp) |
| return(-1); |
| |
| /* skip leading white-space, commas */ |
| for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); |
| |
| if (!*p) { |
| *optionp = p; |
| return(-1); |
| } |
| |
| /* save the start of the token, and skip the rest of the token. */ |
| for (suboptarg = p; |
| *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';); |
| |
| if (*p) { |
| /* |
| * If there's an equals sign, set the value pointer, and |
| * skip over the value part of the token. Terminate the |
| * token. |
| */ |
| if (*p == '=') { |
| *p = '\0'; |
| for (*valuep = ++p; |
| *p && *p != ',' && *p != ' ' && *p != '\t'; ++p); |
| if (*p) |
| *p++ = '\0'; |
| } else |
| *p++ = '\0'; |
| /* Skip any whitespace or commas after this token. */ |
| for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); |
| } |
| |
| /* set optionp for next round. */ |
| *optionp = p; |
| |
| for (cnt = 0; *tokens; ++tokens, ++cnt) |
| if (!strcmp(suboptarg, *tokens)) |
| return(cnt); |
| return(-1); |
| } |