C语言main函数参数解析代码模板

#include "stdio.h"

int main(int argc, char **argv) {
    char *arg;
    for (argc--, argv++; argc > 0 && argv != NULL; argc--, argv++) {
        arg = *argv;
        if (arg[0] == '-') {
            if (arg[1] == 0 || arg[2] != 0) {
                fprintf(stderr, "Ignoring unrecognized param: %s\n", arg);
                continue;
            }
            switch (arg[1]) {
                case 's':
                case 'S':
                    if (argc == 1) {
                        fprintf(stderr, "Expecting output filename. -s is igored\n");
                    } else {
                        fprintf(stdout, "-s recognized, argv[1]:%s\n", argv[1]);
                        --argc;
                        ++argv;
                    }
                    break;
                case 't':
                case 'T':
                    if (argc == 1) {
                        fprintf(stderr, "Expecting output filename. -t is igored\n");
                    } else {
                        fprintf(stdout, "-t recognized, argv[1]:%s\n", argv[1]);
                        --argc;
                        ++argv;
                    }
                    break;
                default:
                    fprintf(stderr, "Ignoring unrecognized param: %s\n", arg);
            }
        } else {
            fprintf(stdout, "default, argv:%s\n", *argv);
        }
    }

    return 0;
}