man _toupper () - transliterate lowercase characters to uppercase
NAME
_toupper - transliterate lowercase characters to uppercase
SYNOPSIS
#include <ctype.h>
int _toupper(int c);
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>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .