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
47int optind_s = 0;
48
49char *optarg_s;
50
51#define GETOPT_FOUND_WITHOUT_ARGUMENT    2
52#define GETOPT_FOUND_WITH_ARGUMENT       1
53#define GETOPT_NOT_FOUND                 0
54
55static int
56getopt_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
74int
75getopt_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}
113