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