C ++转义控制字符

Question

Is there a C++ function to escape the control characters in a string? For example, if the input is "First\\r\\nSecond" the output should be "First\\\\0x0D\\\\0x0ASecond" .

Answer 1

I haven't heard about any but it should be relatively easy to implement one:

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();
}

Answer 2

Is there a C++ function to escape the control characters in a string?

By that, if you mean "Is there a standard library function that you can use to accomplish that?", the answer is no.

Answer 3

I haven't heard of using raw ANSI escape codes as codes in C or C++, but i do know that some like

/n

work for creating newlines, so perhaps use

#define ActualEscapeCode AsciiEscapeCode

to substitute?