Manual browser: tolower(3)

Section:
Page:
TOLOWER(3) Library Functions Manual TOLOWER(3)

NAME

tolowerupper case to lower case letter conversion

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <ctype.h>

int
tolower(int c);

DESCRIPTION

The tolower() function converts an upper-case letter to the corresponding lower-case letter.

RETURN VALUES

If the argument is an upper-case letter, the tolower() function returns the corresponding lower-case letter if there is one; otherwise the argument is returned unchanged.

STANDARDS

The tolower() function conforms to ANSI X3.159-1989 (“ANSI C89”).

CAVEATS

The argument to tolower() must be EOF or representable as an unsigned char; otherwise, the behavior is undefined. See the CAVEATS section of ctype(3) for more details.
April 17, 2008 NetBSD 7.0