Function put_codepoint

smallthinker/common/console.cpp:248–307

    }

    static int put_codepoint(const char* utf8_codepoint, size_t length, int expectedWidth) {
#if defined(_WIN32)
        CONSOLE_SCREEN_BUFFER_INFO bufferInfo;
        if (!GetConsoleScreenBufferInfo(hConsole, &bufferInfo)) {
            // go with the default
            return expectedWidth;
        }
        COORD initialPosition = bufferInfo.dwCursorPosition;
        DWORD nNumberOfChars = length;
        WriteConsole(hConsole, utf8_codepoint, nNumberOfChars, &nNumberOfChars, NULL);

        CONSOLE_SCREEN_BUFFER_INFO newBufferInfo;
        GetConsoleScreenBufferInfo(hConsole, &newBufferInfo);

        // Figure out our real position if we're in the last column
        if (utf8_codepoint[0] != 0x09 && initialPosition.X == newBufferInfo.dwSize.X - 1) {
            DWORD nNumberOfChars;
            WriteConsole(hConsole, &" \b", 2, &nNumberOfChars, NULL);
            GetConsoleScreenBufferInfo(hConsole, &newBufferInfo);
        }

        int width = newBufferInfo.dwCursorPosition.X - initialPosition.X;
        if (width < 0) {
            width += newBufferInfo.dwSize.X;
        }
        return width;
#else
        // We can trust expectedWidth if we've got one
        if (expectedWidth >= 0 || tty == nullptr) {
            fwrite(utf8_codepoint, length, 1, out);
            return expectedWidth;
        }

        fputs("\033[6n", tty); // Query cursor position
        int x1;
        int y1;
        int x2;
        int y2;
        int results = 0;
        results = fscanf(tty, "\033[%d;%dR", &y1, &x1);

        fwrite(utf8_codepoint, length, 1, tty);

        fputs("\033[6n", tty); // Query cursor position
        results += fscanf(tty, "\033[%d;%dR", &y2, &x2);

        if (results != 4) {
            return expectedWidth;
        }

        int width = x2 - x1;
        if (width < 0) {
            // Calculate the width considering text wrapping
            struct winsize w;
            ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
            width += w.ws_col;
        }
        return width;