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109 lines
3.3 KiB
C
109 lines
3.3 KiB
C
/*
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* getopt.c
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*
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* a minimal implementation of the getopt() function, written so that
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* test applications that use that function can run on non-POSIX
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* platforms
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*
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*/
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/*
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*
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* Copyright (c) 2001-2017 Cisco Systems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Cisco Systems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <stdlib.h> /* for NULL */
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int optind_s = 0;
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char *optarg_s;
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#define GETOPT_FOUND_WITHOUT_ARGUMENT 2
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#define GETOPT_FOUND_WITH_ARGUMENT 1
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#define GETOPT_NOT_FOUND 0
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static int getopt_check_character(char c, const char *string)
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{
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unsigned int max_string_len = 128;
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while (*string != 0) {
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if (max_string_len == 0) {
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return GETOPT_NOT_FOUND;
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}
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max_string_len--;
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if (*string++ == c) {
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if (*string == ':') {
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return GETOPT_FOUND_WITH_ARGUMENT;
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} else {
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return GETOPT_FOUND_WITHOUT_ARGUMENT;
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}
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}
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}
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return GETOPT_NOT_FOUND;
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}
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int getopt_s(int argc, char *const argv[], const char *optstring)
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{
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while (optind_s + 1 < argc) {
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char *string;
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/* move 'string' on to next argument */
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optind_s++;
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string = argv[optind_s];
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if (string == NULL)
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return '?'; /* NULL argument string */
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if (string[0] != '-')
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return -1; /* found an unexpected character */
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switch (getopt_check_character(string[1], optstring)) {
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case GETOPT_FOUND_WITH_ARGUMENT:
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if (optind_s + 1 < argc) {
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optind_s++;
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optarg_s = argv[optind_s];
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return string[1];
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} else {
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return '?'; /* argument missing */
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}
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case GETOPT_FOUND_WITHOUT_ARGUMENT:
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return string[1];
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case GETOPT_NOT_FOUND:
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default:
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return '?'; /* didn't find expected character */
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break;
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}
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}
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return -1;
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}
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