| Elliott Hughes | df143f8 | 2016-04-04 17:34:04 -0700 | [diff] [blame] | 1 | /* $OpenBSD: getsubopt.c,v 1.4 2005/08/08 08:05:36 espie 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 | #include <unistd.h> |
| 33 | #include <stdlib.h> |
| 34 | #include <string.h> |
| 35 | |
| 36 | /* |
| 37 | * The SVID interface to getsubopt provides no way of figuring out which |
| 38 | * part of the suboptions list wasn't matched. This makes error messages |
| 39 | * tricky... The extern variable suboptarg is a pointer to the token |
| 40 | * which didn't match. |
| 41 | */ |
| 42 | char *suboptarg; |
| 43 | |
| 44 | int |
| 45 | getsubopt(char **optionp, char * const *tokens, char **valuep) |
| 46 | { |
| 47 | int cnt; |
| 48 | char *p; |
| 49 | |
| 50 | suboptarg = *valuep = NULL; |
| 51 | |
| 52 | if (!optionp || !*optionp) |
| 53 | return(-1); |
| 54 | |
| 55 | /* skip leading white-space, commas */ |
| 56 | for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); |
| 57 | |
| 58 | if (!*p) { |
| 59 | *optionp = p; |
| 60 | return(-1); |
| 61 | } |
| 62 | |
| 63 | /* save the start of the token, and skip the rest of the token. */ |
| 64 | for (suboptarg = p; |
| 65 | *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';); |
| 66 | |
| 67 | if (*p) { |
| 68 | /* |
| 69 | * If there's an equals sign, set the value pointer, and |
| 70 | * skip over the value part of the token. Terminate the |
| 71 | * token. |
| 72 | */ |
| 73 | if (*p == '=') { |
| 74 | *p = '\0'; |
| 75 | for (*valuep = ++p; |
| 76 | *p && *p != ',' && *p != ' ' && *p != '\t'; ++p); |
| 77 | if (*p) |
| 78 | *p++ = '\0'; |
| 79 | } else |
| 80 | *p++ = '\0'; |
| 81 | /* Skip any whitespace or commas after this token. */ |
| 82 | for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); |
| 83 | } |
| 84 | |
| 85 | /* set optionp for next round. */ |
| 86 | *optionp = p; |
| 87 | |
| 88 | for (cnt = 0; *tokens; ++tokens, ++cnt) |
| 89 | if (!strcmp(suboptarg, *tokens)) |
| 90 | return(cnt); |
| 91 | return(-1); |
| 92 | } |