_tolower3p
Transliterate uppercase characters to lowercase
Usage
#include <ctype.h>
int _tolower(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 _tolower() macro shall be equivalent to tolower(c) except that the application shall ensure that the argument c is an uppercase letter.
Return value
Upon successful completion, _tolower() shall return the lowercase letter corresponding to the argument passed.
Errors
No errors are defined.
The following sections are informative.
Examples
None.
Application usage
Applications should use the tolower() function instead of the obsolescent _tolower() function.
Rationale
None.
Future directions
The _tolower() function may be removed in a future version.