__ctype_tolower

Name

__ctype_tolower -- convert uppercase letter to lowercase letter

Synopsis

#include <ctype.h>

int __ctype_tolower(int c);

Description

The __ctype_tolower() function converts an uppercase letter to the corresponding lowercase letter. If the argument is an uppercase letter, the __ctype_tolower() function returns the corresponding lowercase letter if there is one; otherwise, the argument is returned unchanged.

__ctype_tolower is not in the source standard; it is only in the binary standard.