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_toupper | Function (Macro) |
ctype.h |
short _toupper (short c); |
Translates uppercase characters to lowercase.
_toupper does the same conversion as toupper or toextupper, except that it should be used only when c is known to be lowercase (either ordinary or foreign). It is faster, and generates much shorter code than toupper. _toupper returns the converted value of c if it is lowercase; otherwise, the result is undefined. _toupper is a simple macro.