simple.c

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

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