在C中解析具有公共标志的选项

#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>

int main(int argc, char *argv[]) {
    int opt;
    int flag_a = 0, flag_b = 0;
    char *arg_c = NULL;

    while ((opt = getopt(argc, argv, "abc:")) != -1) {
        switch (opt) {
            case 'a':
                flag_a = 1;
                break;
            case 'b':
                flag_b = 1;
                break;
            case 'c':
                arg_c = optarg;
                break;
            default:
                fprintf(stderr, "Usage: %s [-a] [-b] [-c arg]\n", argv[0]);
                exit(EXIT_FAILURE);
        }
    }

    printf("flag_a = %d\n", flag_a);
    printf("flag_b = %d\n", flag_b);
    printf("arg_c = %s\n", arg_c);

    return 0;
}