# simple.c

    #include <string.h>
    #include <stdlib.h>
    #include "confuse.h"

    int main(void)
    {
        cfg_bool_t verbose = cfg_false;
        char *server = NULL;
        double delay = 1.356e-32;
        char *username = NULL;

        /* Although the macro used to specify an integer option is called
         * CFG_SIMPLE_INT(), it actually expects a long int. On a 64 bit system
         * where ints are 32 bit and longs 64 bit (such as the x86-64 or amd64
         * architectures), you will get weird effects if you use an int here.
         *
         * If you use the regular (non-"simple") options, ie CFG_INT() and use
         * cfg_getint(), this is not a problem as the data types are implicitly
         * cast.
         */
        long int debug = 1;

        cfg_opt_t opts[] = {
            CFG_SIMPLE_BOOL("verbose", &verbose),
            CFG_SIMPLE_STR("server", &server),
            CFG_SIMPLE_STR("user", &username),
            CFG_SIMPLE_INT("debug", &debug),
            CFG_SIMPLE_FLOAT("delay", &delay),
            CFG_END()
        };
        cfg_t *cfg;

        /* set default value for the server option */
        server = strdup("gazonk");

        cfg = cfg_init(opts, 0);
        cfg_parse(cfg, "simple.conf");

        printf("verbose: %s\n", verbose ? "true" : "false");
        printf("server: %s\n", server);
        printf("username: %s\n", username);
        printf("debug: %ld\n", debug);
        printf("delay: %G\n", delay);

        printf("setting username to 'foo'\n");
        /* using cfg_setstr here is not necessary at all, the equivalent
         * code is:
         *   free(username);
         *   username = strdup("foo");
         */
        cfg_setstr(cfg, "user", "foo");
        printf("username: %s\n", username);

        /* print the parsed values to another file */
        {
            FILE *fp = fopen("simple.conf.out", "w");
            cfg_print(cfg, fp);
            fclose(fp);
        }

        cfg_free(cfg);

        /* You are responsible for freeing string values. */
        free(server);
        free(username);

        return 0;
    }