Analyse des arguments de ligne de commande en C

Analyse par moi-même :

#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct {
    char* filepath;
    bool myflag;
    int myvalue;
} CliArgs;

static inline void error(const char* message) {
    fprintf(stderr, "%s\n", message);
    exit(1);
}

CliArgs parse(int argc, char** argv) {
    CliArgs cli_args = { .filepath = 0, .myflag = false, .myvalue = 0 };

    if (argc == 1)
        error("No argument was passed.");

    for (int i = 1; i < argc; ++i) {
        if (!strcmp(argv[i], "--myflag")) {
            cli_args.myflag = true;
            continue;
        }

        if (!strcmp(argv[i], "--myvalue")) {
            ++i;

            if (i == argc)
                error("No value passed for --myvalue.");

            char* str_end;
            cli_args.myvalue = strtol(argv[i], &str_end, 10);

            if (*str_end)
                error("Invalid value for --myvalue.");

            continue;
        }

        if (cli_args.filepath)
            error("Only a single filepath can be given.");
        else
            cli_args.filepath = argv[i];
    }

    if (!cli_args.filepath)
        error("No filepath was passed.");

    return cli_args;
}

int main(int argc, char** argv) {
    CliArgs cli_args = parse(argc, argv);

    printf("%s was called:\n", argv[0]);

    printf(
        "%s is the filepath, myflag is %s and myvalue is %i.\n",
        cli_args.filepath,
        cli_args.myflag ? "true" : "false",
        cli_args.myvalue
    );

    return 0;
}

L'exécuter :

$ gcc cli_args.c -o cli_args

$ ./cli_args 
No argument was passed.

$ ./cli_args foo.txt
./cli_args was called:
foo.txt is the filepath, myflag is false and myvalue is 0.

$ ./cli_args foo.txt --myvalue
No value passed for --myvalue.

$ ./cli_args foo.txt --myvalue bar
Invalid value for --myvalue.

$ ./cli_args foo.txt --myvalue 123
./cli_args was called:
foo.txt is the filepath, myflag is false and myvalue is 123.

$ ./cli_args foo.txt --myvalue 123 --myflag
./cli_args was called:
foo.txt is the filepath, myflag is true and myvalue is 123.

Ce qui précède est le contenu détaillé de. pour plus d'informations, suivez d'autres articles connexes sur le site Web de PHP en chinois!