_TOLOWER(3) Library Functions Manual _TOLOWER(3)

NAME

_tolower — transliterate uppercase characters to lowercase

SYNOPSIS

[OB XSI]
#include <ctype.h>

int _tolower(int c);

The _tolower () macro shall be equivalent to tolower ( c) except that the application shall ensure that the argument c is an uppercase letter.

Upon successful completion, _tolower () shall return the lowercase letter corresponding to the argument passed.

No errors are defined.

None.

Applications should use the tolower(3) function instead of the obsolescent _tolower () function.

None.

The _tolower () function may be removed in a future version.

First released in Issue 1. Derived from Issue 1 of the SVID.

The normative text is updated to avoid use of the term "must" for application requirements.

The _tolower () function is marked obsolescent.

January 1, 2016 posix.fail