C++转义控制字符

Question

是否有 C++ 函数可以转义字符串中的控制字符？例如，如果输入是 "First\r\nSecond"，则输出应该是 "First\\0x0D\\0x0ASecond"。

Answer 1

我还没有听说过，但实现一个应该相对容易:

unordered_map<char, string> replacementmap;
void initreplecementmap() {
    replacementmap['\''] = "\\0x27";
    replacementmap['\"'] = "\\0x22";
    replacementmap['\?'] = "\\0x3f";
    replacementmap['\\'] = "\\\\";
    replacementmap['\a'] = "\\0x07";
    replacementmap['\b'] = "\\0x08";
    replacementmap['\f'] = "\\0x0c";
    replacementmap['\n'] = "\\0x0a";
    replacementmap['\r'] = "\\0x0d";
    replacementmap['\t'] = "\\0x09";
    replacementmap['\v'] = "\\0x0b";
}

string replace_escape(string s) {
    stringstream ss;

    for (auto c: s) {
        if (replacementmap.find(c) != replacementmap.end()) {
            ss << replacementmap[c];
        } else {
            ss << c;
        }
    }
    return ss.str();
}