# ftpconf.c

    /*
     * Parses and prints the configuration options for a fictous ftp client
     */

    #include <stdio.h>
    #include <string.h>
    #include <errno.h>
    #include <confuse.h>

    /* valid values for the auto-create-bookmark option */
    #define ACB_YES 1
    #define ACB_NO 2
    #define ACB_ASK 3

    /* called on alias() functions in the config file */
    int conf_alias(cfg_t *cfg, cfg_opt_t *opt, int argc, const char **argv)
    {
        if(argc < 2)
        {
            cfg_error(cfg, "function '%s' requires 2 arguments", cfg_opt_name(opt));
            return -1;
        }
        printf("got alias '%s' = '%s'\n", argv[0], argv[1]);
        return 0;
    }

    /* parse values for the auto-create-bookmark option */
    int conf_parse_acb(cfg_t *cfg, cfg_opt_t *opt, const char *value, void *result)
    {
        if(strcmp(value, "yes") == 0)
            *(int *)result = ACB_YES;
        else if(strcmp(value, "no") == 0)
            *(int *)result = ACB_NO;
        else if(strcmp(value, "ask") == 0)
            *(int *)result = ACB_ASK;
        else
        {
            cfg_error(cfg, "invalid value for option '%s': %s",
            cfg_opt_name(opt), value);
            return -1;
        }
        return 0;
    }

    /* validates a port option (must be positive) */
    int conf_validate_port(cfg_t *cfg, cfg_opt_t *opt)
    {
        int value = cfg_opt_getnint(opt, 0);
        if(value <= 0)
        {
            cfg_error(cfg, "invalid port %d in section '%s'", value, cfg_name(cfg));
            return -1;
        }
        return 0;
    }

    /* validates a bookmark section (host option required) */
    int conf_validate_bookmark(cfg_t *cfg, cfg_opt_t *opt)
    {
        cfg_t *bookmark = cfg_opt_getnsec(opt, cfg_opt_size(opt) - 1);
        if(cfg_size(bookmark, "host") == 0)
        {
            cfg_error(cfg, "missing required option 'host' in bookmark");
            return -1;
        }
        return 0;
    }

    cfg_t *parse_conf(const char *filename)
    {
        cfg_opt_t bookmark_opts[] = {
            CFG_STR("host", 0, CFGF_NODEFAULT),
            CFG_INT("port", 21, CFGF_NONE),
            CFG_STR("login", "anonymous", CFGF_NONE),
            CFG_STR("password", "anonymous@", CFGF_NONE),
            CFG_STR("directory", 0, CFGF_NONE),
            CFG_END()
        };

        cfg_opt_t opts[] = {
            CFG_SEC("bookmark", bookmark_opts, CFGF_MULTI | CFGF_TITLE),
            CFG_BOOL("passive-mode", cfg_false, CFGF_NONE),
            CFG_BOOL("remote-completion", cfg_true, CFGF_NONE),
            CFG_FUNC("alias", conf_alias),
            CFG_STR_LIST("xterm-terminals", "{xterm, rxvt}", CFGF_NONE),
            CFG_INT_CB("auto-create-bookmark", ACB_YES, CFGF_NONE, conf_parse_acb),
            CFG_FUNC("include-file", cfg_include),
            CFG_END()
        };

        cfg_t *cfg = cfg_init(opts, CFGF_NONE);
        cfg_set_validate_func(cfg, "bookmark|port", conf_validate_port);
        cfg_set_validate_func(cfg, "bookmark", conf_validate_bookmark);

        switch(cfg_parse(cfg, filename))
        {
            case CFG_FILE_ERROR:
                printf("warning: configuration file '%s' could not be read: %s\n",
                        filename, strerror(errno));
                printf("continuing with default values...\n\n");
            case CFG_SUCCESS:
                break;
            case CFG_PARSE_ERROR:
                return 0;
        }

        return cfg;
    }

    int main(int argc, char **argv)
    {
        int i;
        cfg_t *cfg = parse_conf(argc > 1 ? argv[1] : "ftp.conf");

        /* print the parsed configuration options */
        if(cfg)
        {
            printf("passive-mode = %s\n",
            cfg_getbool(cfg, "passive-mode") ? "true" : "false");
            printf("remote-completion = %s\n",
            cfg_getbool(cfg, "remote-completion") ? "true" : "false");

            printf("number of bookmarks: %d\n", cfg_size(cfg, "bookmark"));
            for(i = 0; i < cfg_size(cfg, "bookmark"); i++)
            {
                cfg_t *bookmark = cfg_getnsec(cfg, "bookmark", i);
                printf("  bookmark #%d: %s:%s@%s:%ld%s\n", i+1,
                        cfg_getstr(bookmark, "login"),
                        cfg_getstr(bookmark, "password"),
                        cfg_getstr(bookmark, "host"),
                        cfg_getint(bookmark, "port"),
                        cfg_getstr(bookmark, "directory"));
            }

            for(i = 0; i < cfg_size(cfg, "xterm-terminals"); i++)
        {
                printf("xterm-terminal #%d: %s\n",
            i+1, cfg_getnstr(cfg, "xterm-terminals", i));
        }

            printf("auto-create-bookmark = %ld\n",
            cfg_getint(cfg, "auto-create-bookmark"));
            cfg_free(cfg);
        }

        return 0;
    }