toupper(3C) Standard C Library Functions toupper(3C)
NAME
toupper - 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
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 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 corresponding 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)