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
getopt_check_character(char c,const char * string)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
getopt_s(int argc,char * const argv[],const char * optstring)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 }
113