TOUPPER(3C) Standard C Library Functions TOUPPER(3C)

NAME

toupper, toupper_l - transliterate lower-case characters to upper-case

SYNOPSIS

#include <ctype.h>

int toupper(int c);

int toupper_l(int c, locale_t loc);

DESCRIPTION

The toupper() function has as a domain of type int, the value of which is
representable as an unsigned char or the value of EOF. If the argument
has any other value, the argument is returned unchanged. If the argument
of toupper() represents a lower-case letter, and there exists a
corresponding upper-case letter (as defined by character type information
in the locale category LC_CTYPE), the result is the corresponding
upper-case letter. All other arguments in the domain are returned
unchanged.

The function toupper_l() behaves identically to toupper(), except instead
of operating in the current locale, it operates in the locale specified
by loc.

A macro form, _toupper() exists. It is defined for standards conformance,
particularly with legacy standards. It was deprecated in POSIX 2008
(Issue 7), and its use is discouraged. The macro, on this system, is just
an alias for toupper().

RETURN VALUES

On successful completion, toupper() returns the upper-case letter
corresponding to the argument passed.

ERRORS

No errors are defined.

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:

+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|CSI | Enabled |
+--------------------+-----------------+
|Interface Stability | Standard |
+--------------------+-----------------+
|MT-Level | MT-Safe |
+--------------------+-----------------+

SEE ALSO

newlocale(3C), setlocale(3C), uselocale(3C), attributes(7), standards(7)


October 4, 2015 TOUPPER(3C)