Convert a character to ASCII upper case. If the character is not an
ASCII lower case letter, it is returned unchanged.
Unlike the standard C library toupper() function, this only
recognizes standard ASCII letters and ignores the locale, returning
all non-ASCII characters unchanged, even if they are upper case
letters in a particular character set. Also unlike the standard
library function, this takes and returns a char, not an int, so
don't call it on EOF but no need to worry about casting to guchar
before passing a possibly non-ASCII character in.
Convert a character to ASCII upper case. If the character is not an ASCII lower case letter, it is returned unchanged.
Unlike the standard C library
toupper()function, this only recognizes standard ASCII letters and ignores the locale, returning all non-ASCII characters unchanged, even if they are upper case letters in a particular character set. Also unlike the standard library function, this takes and returns a char, not an int, so don't call it onEOFbut no need to worry about casting togucharbefore passing a possibly non-ASCII character in.