toupper(3C) Standard C Library Functions toupper(3C)NAMEtoupper - transliterate lower-case characters to upper-case
SYNOPSIS
#include <ctype.h>
int toupper(int c);
DESCRIPTION
The toupper() function has as a domain a type int, the value of which
is representable as an unsigned char or the value of EOF. If the argu‐
ment 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 infor‐
mation in the program locale category LC_CTYPE), the result is the
corresponding upper-case letter. All other arguments in the domain are
returned unchanged.
RETURN VALUES
On successful completion, toupper() returns the upper-case letter cor‐
responding to the argument passed.
ERRORS
No errors are defined.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│CSI │Enabled │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Standard │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSO_toupper(3C), setlocale(3C), attributes(5), standards(5)SunOS 5.10 14 Aug 2002 toupper(3C)