_toupper - transliterate lowercase characters to uppercase
#include <ctype.h> int _toupper(int c);
The _toupper() macro is equivalent to toupper(3C) except that the argument c must be a lowercase letter.
On successful completion, _toupper() returns the uppercase letter corresponding to the argument passed.
No errors are defined.
See attributes(7) for descriptions of the following attributes:
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islower(3C), toupper(3C), attributes(7), standards(7)
The Single UNIX Specification, Version 4 standard marked this interface obsolescent.