_TOUPPER(3) Library Functions Manual _TOUPPER(3)

_toupper — transliterate lowercase characters to uppercase


#include <ctype.h>

int _toupper(int c);

The _toupper () macro shall be equivalent to toupper(3) except that the application shall ensure that the argument is a lowercase letter.

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

No errors are defined.

None.

None.

None.

None.

islower(3), toupper(3), the Base Definitions volume of IEEE Std 1003.1-2001 (“POSIX.1”), xbd_chap07(7), <ctype.h>

First released in Issue 1. Derived from Issue 1 of the SVID.

The DESCRIPTION is updated to avoid use of the term "must" for application requirements.

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January 1, 2004 posix.fail