Implementation status: to be implemented

Synopsis

#include <ctype.h>

int _toupper(int c);

Description

The _toupper() macro is equivalent to toupper() except that the application ensures that the argument c is an lowercase letter.

Arguments:
c - a letter to be transliterated to uppercase.

Return value

Upon successful completion, _toupper() returns the uppercase letter corresponding to the argument passed.

Errors

No errors are defined.

Comments

Applications should use the toupper() function instead of the obsolescent _toupper() function.
The _toupper() function may be removed in a future version.