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) 2001-2017 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
getopt_check_character(char c,const char * string)55 static int getopt_check_character(char c, const char *string)
56 {
57 unsigned int max_string_len = 128;
58
59 while (*string != 0) {
60 if (max_string_len == 0) {
61 return GETOPT_NOT_FOUND;
62 }
63 max_string_len--;
64 if (*string++ == c) {
65 if (*string == ':') {
66 return GETOPT_FOUND_WITH_ARGUMENT;
67 } else {
68 return GETOPT_FOUND_WITHOUT_ARGUMENT;
69 }
70 }
71 }
72 return GETOPT_NOT_FOUND;
73 }
74
getopt_s(int argc,char * const argv[],const char * optstring)75 int getopt_s(int argc, char *const argv[], const char *optstring)
76 {
77 while (optind_s + 1 < argc) {
78 char *string;
79
80 /* move 'string' on to next argument */
81 optind_s++;
82 string = argv[optind_s];
83
84 if (string == NULL)
85 return '?'; /* NULL argument string */
86
87 if (string[0] != '-')
88 return -1; /* found an unexpected character */
89
90 switch (getopt_check_character(string[1], optstring)) {
91 case GETOPT_FOUND_WITH_ARGUMENT:
92 if (optind_s + 1 < argc) {
93 optind_s++;
94 optarg_s = argv[optind_s];
95 return string[1];
96 } else {
97 return '?'; /* argument missing */
98 }
99 case GETOPT_FOUND_WITHOUT_ARGUMENT:
100 return string[1];
101 case GETOPT_NOT_FOUND:
102 default:
103 return '?'; /* didn't find expected character */
104 break;
105 }
106 }
107
108 return -1;
109 }
110