towlower(3)

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 \nwc\n);\n
\nwint_t towlower_l(wint_t \nwc\n, locale_t \nlocale\n);

towlower_l():

\n
    Since glibc 2.10:
\n
        _XOPEN_SOURCE >= 700
\n
    Before glibc 2.10:
\n
        _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).

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)