xdg.c

#include <pwd.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "utils.h"

char *xdg_config_dir(char *postfix) {
    char *config_home;
    if ((config_home = getenv("XDG_CONFIG_HOME"))) {
        size_t config_home_len = strlen(config_home);
        char *buf = malloc(config_home_len + (postfix ? strlen(postfix) : 0) + 2);

        strcpy(buf, config_home);
        while (config_home[config_home_len - 1] == '/') {
        buf[--config_home_len] = 0;
        }
        if (postfix) {
        buf[config_home_len] = '/';
        strcpy(buf+config_home_len+1, postfix);
        }

        return buf;
    } else {
        char *name = get_user_name();
        size_t name_len = strlen(name);

        char *buf = malloc(strlen("/home/") + name_len + strlen("/.config/") +
                        (postfix ? strlen(postfix) : 0) + 1);

        strcpy(buf, "/home/");
        strcat(buf, name);
        strcat(buf, "/.config");
        if (postfix) {
        size_t end = strlen("/home/") + name_len + strlen("/.config");
        buf[end] = '/';
        strcpy(buf+end+1, postfix);
        }

        return buf;
    }
}