static inline unsigned int fixSpecialCharacters()

in src/agent/Terminal.cc [214:247]

• 15 lines of code
• 9 McCabe index (conditional complexity)

static inline unsigned int fixSpecialCharacters(unsigned int ch)
{
    if (ch <= 0x1b) {
        switch (ch) {
            // The Windows Console has a popup window (e.g. that appears with
            // F7) that is sometimes bordered with box-drawing characters.
            // With the Japanese and Korean system locales (CP932 and CP949),
            // the UnicodeChar values for the box-drawing characters are 1
            // through 6.  Detect this and map the values to the correct
            // Unicode values.
            //
            // N.B. In the English locale, the UnicodeChar values are correct,
            // and they identify single-line characters rather than
            // double-line.  In the Chinese Simplified and Traditional locales,
            // the popups use ASCII characters instead.
            case 1: return 0x2554; // BOX DRAWINGS DOUBLE DOWN AND RIGHT
            case 2: return 0x2557; // BOX DRAWINGS DOUBLE DOWN AND LEFT
            case 3: return 0x255A; // BOX DRAWINGS DOUBLE UP AND RIGHT
            case 4: return 0x255D; // BOX DRAWINGS DOUBLE UP AND LEFT
            case 5: return 0x2551; // BOX DRAWINGS DOUBLE VERTICAL
            case 6: return 0x2550; // BOX DRAWINGS DOUBLE HORIZONTAL

            // Convert an escape character to some other character.  This
            // conversion only applies to console cells containing an escape
            // character.  In newer versions of Windows 10 (e.g. 10.0.10586),
            // the non-legacy console recognizes escape sequences in
            // WriteConsole and interprets them without writing them to the
            // cells of the screen buffer.  In that case, the conversion here
            // does not apply.
            case 0x1b: return '?';
        }
    }
    return ch;
}