55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
/*
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* Example getopt usage mostly from getopt(3)
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*/
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <libgen.h>
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void die_usage(char *prog, char *msg) {
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fprintf(stderr, "Usage: %s [-t nsecs] [-n] name\n", prog);
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if (msg != NULL) {
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fprintf(stderr, "%s\n", msg);
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}
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exit(EXIT_FAILURE);
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}
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int main(int argc, char *argv[]) {
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char *prog;
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int flags, opt;
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int nsecs, tfnd;
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nsecs = 0;
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tfnd = 0;
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flags = 0;
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prog = basename(argv[0]);
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while ((opt = getopt(argc, argv, "hnt:")) != -1) {
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switch (opt) {
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case 'n':
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flags = 1;
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break;
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case 't':
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nsecs = atoi(optarg);
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tfnd = 1;
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break;
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case 'h':
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default: /* '?' */
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die_usage(prog, NULL);
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}
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}
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printf("flags=%d; tfnd=%d; optind=%d\n", flags, tfnd, optind);
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if (optind >= argc) {
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die_usage(prog, "Expected argument after options");
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}
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printf("name argument = %s\n", argv[optind]);
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printf("nsecs = %d\n", nsecs);
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exit(EXIT_SUCCESS);
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}
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