So... it's often good to do 'sanitizing' of input. In this case, where it's direct user input, speed should not even be a problem.

OK, what about:

u = g_utf8_get_char (utf8); if (u == (gunichar) -1) { g_warning ("Bad UTF-8 character"); return pos; } if (!g_unichar_isprint (u)) { g_warning ("Non-printable character"); return pos; }

is this enough sanitizing? :)

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