TOLOWER(3) OpenBSD Programmer's Manual TOLOWER(3)NAME
tolower, _tolower - upper case to lower case letter conversion
SYNOPSIS
#include <ctype.h>
int
tolower(int c);
int
_tolower(int c);
DESCRIPTION
The tolower() function converts an upper-case letter to the corresponding
lower-case letter. The _tolower() function is identical to tolower()
except that c must be an upper-case letter.
RETURN VALUES
If the argument to the tolower() function is an upper-case letter, the
corresponding lower-case letter is returned if there is one; otherwise
the argument is returned unchanged. If the argument to the _tolower()
function is an upper-case letter, the corresponding lower-case letter is
returned; otherwise the output is undefined.
SEE ALSOisalnum(3), isalpha(3), isascii(3), isblank(3), iscntrl(3), isdigit(3),
isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3),
isxdigit(3), stdio(3), toascii(3), toupper(3), ascii(7)STANDARDS
The tolower() and _tolower() functions conform to ANSI X3.159-1989
(``ANSI C'').
OpenBSD 4.9 May 31, 2007 OpenBSD 4.9