Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 1 | /* |
| 2 | * getopt.c |
| 3 | * |
| 4 | * a minimal implementation of the getopt() function, written so that |
| 5 | * test applications that use that function can run on non-POSIX |
| 6 | * platforms |
| 7 | * |
| 8 | */ |
| 9 | /* |
| 10 | * |
| 11 | * Copyright (c) 2001-2006 Cisco Systems, Inc. |
| 12 | * All rights reserved. |
| 13 | * |
| 14 | * Redistribution and use in source and binary forms, with or without |
| 15 | * modification, are permitted provided that the following conditions |
| 16 | * are met: |
| 17 | * |
| 18 | * Redistributions of source code must retain the above copyright |
| 19 | * notice, this list of conditions and the following disclaimer. |
| 20 | * |
| 21 | * Redistributions in binary form must reproduce the above |
| 22 | * copyright notice, this list of conditions and the following |
| 23 | * disclaimer in the documentation and/or other materials provided |
| 24 | * with the distribution. |
| 25 | * |
| 26 | * Neither the name of the Cisco Systems, Inc. nor the names of its |
| 27 | * contributors may be used to endorse or promote products derived |
| 28 | * from this software without specific prior written permission. |
| 29 | * |
| 30 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 31 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 32 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 33 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 34 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
| 35 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| 36 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| 37 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 40 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 41 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 42 | * |
| 43 | */ |
| 44 | |
| 45 | #include <stdlib.h> /* for NULL */ |
| 46 | |
| 47 | int optind_s = 0; |
| 48 | |
| 49 | char *optarg_s; |
| 50 | |
| 51 | #define GETOPT_FOUND_WITHOUT_ARGUMENT 2 |
| 52 | #define GETOPT_FOUND_WITH_ARGUMENT 1 |
| 53 | #define GETOPT_NOT_FOUND 0 |
| 54 | |
| 55 | static int |
| 56 | getopt_check_character(char c, const char *string) { |
| 57 | unsigned int max_string_len = 128; |
| 58 | |
| 59 | while (*string != 0) { |
| 60 | if (max_string_len == 0) { |
| 61 | return '?'; |
| 62 | } |
| 63 | if (*string++ == c) { |
| 64 | if (*string == ':') { |
| 65 | return GETOPT_FOUND_WITH_ARGUMENT; |
| 66 | } else { |
| 67 | return GETOPT_FOUND_WITHOUT_ARGUMENT; |
| 68 | } |
| 69 | } |
| 70 | } |
| 71 | return GETOPT_NOT_FOUND; |
| 72 | } |
| 73 | |
| 74 | int |
| 75 | getopt_s(int argc, |
| 76 | char * const argv[], |
| 77 | const char *optstring) { |
| 78 | |
| 79 | |
| 80 | while (optind_s + 1 < argc) { |
| 81 | char *string; |
| 82 | |
| 83 | /* move 'string' on to next argument */ |
| 84 | optind_s++; |
| 85 | string = argv[optind_s]; |
| 86 | |
| 87 | if (string == NULL) |
| 88 | return '?'; /* NULL argument string */ |
| 89 | |
| 90 | if (string[0] != '-') |
| 91 | return -1; /* found an unexpected character */ |
| 92 | |
| 93 | switch(getopt_check_character(string[1], optstring)) { |
| 94 | case GETOPT_FOUND_WITH_ARGUMENT: |
| 95 | if (optind_s + 1 < argc) { |
| 96 | optind_s++; |
| 97 | optarg_s = argv[optind_s]; |
| 98 | return string[1]; |
| 99 | } else { |
| 100 | return '?'; /* argument missing */ |
| 101 | } |
| 102 | case GETOPT_FOUND_WITHOUT_ARGUMENT: |
| 103 | return string[1]; |
| 104 | case GETOPT_NOT_FOUND: |
| 105 | default: |
| 106 | return '?'; /* didn't find expected character */ |
| 107 | break; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | return -1; |
| 112 | } |