_toupper3p
Transliterate lowercase characters to uppercase
Usage
#include <ctype.h>
int _toupper(int c);
Prolog
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
Overview
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
Applications should use the toupper() function instead of the obsolescent _toupper() function.
Rationale
None.
Future directions
The _toupper() function may be removed in a future version.