The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.

NAME

_toupper - transliterate lowercase characters to uppercase

SYNOPSIS

[XSI] [Option Start] #include <ctype.h>

int _toupper(int c); [Option End]

DESCRIPTION

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

RETURN VALUE

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

ERRORS

No errors are defined.

The following sections are informative.

EXAMPLES

None.

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

islower(), toupper(), the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 7, Locale, <ctype.h>

CHANGE HISTORY

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

Issue 6

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

End of informative text.
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