Man page - towlower(3)

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Manual

towlower

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ATTRIBUTES
STANDARDS
STANDARDS
NOTES
SEE ALSO

NAME

towlower, towlower_l - convert a wide character to lowercase

LIBRARY

Standard C library ( libc , -lc )

SYNOPSIS

#include <wctype.h>

wint_t towlower(wint_t wc );
wint_t towlower_l(wint_t wc , locale_t locale );

Feature Test Macro Requirements for glibc (see feature_test_macros (7)):

towlower_l ():
Since glibc 2.10:
_XOPEN_SOURCE >= 700
Before glibc 2.10:
_GNU_SOURCE

DESCRIPTION

The towlower () function is the wide-character equivalent of the tolower (3) function. If wc is an uppercase wide character, and there exists a lowercase equivalent in the current locale, it returns the lowercase equivalent of wc . In all other cases, wc is returned unchanged.

The towlower_l () function performs the same task, but performs the conversion based on the character type information in the locale specified by locale . The behavior of towlower_l () is undefined if locale is the special locale object LC_GLOBAL_LOCALE (see duplocale (3)) or is not a valid locale object handle.

The argument wc must be representable as a wchar_t and be a valid character in the locale or be the value WEOF .

RETURN VALUE

If wc was convertible to lowercase, towlower () returns its lowercase equivalent; otherwise it returns wc .

ATTRIBUTES

For an explanation of the terms used in this section, see attributes (7).

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STANDARDS

towlower ()

C11, POSIX.1-2008 (XSI).

towlower_l ()

POSIX.1-2008.

STANDARDS

towlower ()

C99, POSIX.1-2001 (XSI). Obsolete in POSIX.1-2008 (XSI).

towlower_l ()

glibc 2.3. POSIX.1-2008.

NOTES

The behavior of these functions depends on the LC_CTYPE category of the locale.

These functions are not very appropriate for dealing with Unicode characters, because Unicode knows about three cases: upper, lower, and title case.

SEE ALSO

iswlower (3), towctrans (3), towupper (3), locale (7)