tolower#

Synopsis#

#include <ctype.h>

int tolower(int c);

Status#

Implemented

Conformance#

IEEE Std 1003.1-2017

Description#

The tolower() function has as a domain a type int, the value of which is representable as a unsigned char or the value of EOF.

If the argument has any other value, the behavior is undefined.

If the argument of tolower() represents an uppercase letter, and there exists a corresponding lowercase letter as defined by character type information in the current locale respectively the result shall be the corresponding lowercase letter.

All other arguments in the domain are returned unchanged.

Return value#

Upon successful completion, the tolower() function shall return the lowercase letter corresponding to the argument passed, otherwise, they shall return the argument unchanged.

Errors#

No errors are defined.

Tests#

Tested

Known bugs#

None