sc/option/README.md

### Option

- A basic alternative to getopt but quite limited compared to it.
- Long or short version of options are supported. Values are accepted only with  
  '=' sign.
  - --address=127.0.0.1
  - -a=127.0.0.1

```c

#include "sc_option.h"

static struct sc_option_item options[] = {{.letter = 'm', .name = NULL},
                                          {.letter = 'k', .name = "key"},
                                          {.letter = 'h', .name = "help"}};

int main(int argc, char *argv[])
{
    char *value;

    struct sc_option opt = {.argv = argv,
                            .count = sizeof(options) / sizeof(options[0]),
                            .options = options};

    for (int i = 1; i < argc; i++) {
        char c = sc_option_at(&opt, i, &value);
        switch (c) {
        case 'm':
            // If value does not exist, it will point to '\0' character.
            printf("Option 'm', value : %s \n", value);
            break;
        case 'k':
            printf("Option 'k', value : %s \n", value);
            break;
        case 'h':
            printf("Option 'h', value : %s \n", value);
            break;
        case '?':
            printf("Unknown option : %s \n", argv[i]);
            break;
        }
    }


    return 0;
}```