sscanf解析字符串

貼一段android的代碼，一看就懂

以下代碼爲vold檢測u盤是否掛載的代碼，通過查看path是否存在，來確定u盤是否掛載成功

sscanf(line, "%255s %255s %255s\n", device, mount_path, rest);爲解析字符串的操作

bool Volume::isMountpointMounted(const char *path) {
    char device[256];
    char mount_path[256];
    char rest[256];
    FILE *fp;
    char line[1024];

    if (!(fp = fopen("/proc/mounts", "r"))) {
        SLOGE("Error opening /proc/mounts (%s)", strerror(errno));
        return false;
    }

    while(fgets(line, sizeof(line), fp)) {
        line[strlen(line)-1] = '\0';
        sscanf(line, "%255s %255s %255s\n", device, mount_path, rest);
        if (!strcmp(mount_path, path)) {
            fclose(fp);
            return true;
        }
    }

    fclose(fp);
    return false;
}