looking for tool to convert unescape string to escapted string [closed]

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i just wander where can i find a tool that takes in my case java script string that is

unescape and converting it to escaped string so i could use it as string value in c++

for example characters like " i need to convert it to \"

i need something smart and not just replace all function .

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Notepad++ would do it well.

Menu TextFX > TextFX Characters > Escape...

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Pseudo code similar to C:

while(got_input_data)
{
    char = getFirstChar();
    if(char == '\"')
    {
        putchar('\');
        putchar('\"');
    }
    else if( another character that must be escaped )
    {
        // do similar stuff
    }
    else
    {
        // simply print the char that doesn't need to be escaped
        putchar(char);
    }
}

I don't know if such tools exist but I must admit that I wrote something similar when I needed to put a html page as a string in a CGI that was written in C. Old days ...