c/c++补完计划(二): c字符串复制

const char *copyStr(const char *str) {
    char *ret = nullptr;
    if (str == nullptr) {
        return ret;
    }

    // 获取长度
    int len = strlen(str);

    // 复制串
    ret = (char *) malloc(sizeof(char) * (len + 1));
    memset(ret, 0, sizeof(char) * (len + 1));

    char *tmp = ret;
    while ((*tmp++ = *str++) != '\0');

    return ret;
}

int main() {
    const char *str = "hello, world";
    const char *ret = copyStr(str);
    cout << ret << endl;
    return 0;
}