64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <getopt.h>
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char *optarg = NULL; // global argument pointer
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int optind = 0; // global argv index
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int getopt(int argc, char *argv[], char *optstring) {
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static char *next = NULL;
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char c;
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char *cp = NULL;
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if (optind == 0)
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next = NULL;
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optarg = NULL;
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if (next == NULL || *next == '\0') {
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if (optind == 0)
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optind++;
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if (optind >= argc || argv[optind][0] != '-' || argv[optind][1] == '\0') {
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optarg = NULL;
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if (optind < argc)
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optarg = argv[optind];
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return EOF;
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}
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if (strncmp(argv[optind], "--", 2) == 0) {
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optind++;
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optarg = NULL;
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if (optind < argc)
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optarg = argv[optind];
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return EOF;
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}
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next = argv[optind];
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next++; // skip past -
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optind++;
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}
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c = *next++;
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cp = strchr(optstring, c);
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if (cp == NULL || c == ':')
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return '?';
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cp++;
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if (*cp == ':') {
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if (*next != '\0') {
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optarg = next;
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next = NULL;
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}
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else if (optind < argc) {
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optarg = argv[optind];
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optind++;
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}
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else {
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return '?';
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}
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}
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return c;
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}
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