Push a character back onto the input buffer
int SLang_ungetkey (unsigned char ch)
SLang_ungetkey pushes the character ch back onto the
SLgetkey input stream. Upon success, it returns zero,
otherwise it returns 1.
This function is implemented as:
int SLang_ungetkey (unsigned char ch)
{
return SLang_ungetkey_string(&ch, 1);
}
SLang_getkey, SLang_ungetkey_string