drop in non-blocking replacement for std::getline

getline_async.h

#include <iostream>

bool getline_async(std::istream& is, std::string& str, char delim = '\n') {

    static std::string lineSoFar;
    char inChar;
    int charsRead = 0;
    bool lineRead = false;
    str = "";

    do {
        charsRead = is.readsome(&inChar, 1);
        if (charsRead == 1) {
            // if the delimiter is read then return the string so far
            if (inChar == delim) {
                str = lineSoFar;
                lineSoFar = "";
                lineRead = true;
            } else {  // otherwise add it to the string so far
                lineSoFar.append(1, inChar);
            }
        }
    } while (charsRead != 0 && !lineRead);

    return lineRead;
}

doesnt work
Can you describe the issue you're having. I've successfully used this function many times.

dont remember but i was using it on a embedded system and it was returning garbage.