Путеводитель по Руководству Linux

  User  |  Syst  |  Libr  |  Device  |  Files  |  Other  |  Admin  |  Head  |



   towlower    ( 3 )

преобразовать широкий символ в нижний регистр (convert a wide character to lowercase)

Имя (Name)

towlower, towlower_l - convert a wide character to lowercase


Синопсис (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


Описание (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.


Возвращаемое значение (Return value)

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


Версии (Versions)

The towlower_l() function first appeared in glibc 2.3.


Атрибуты (Attributes)

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

┌───────────────────────────────┬───────────────┬────────────────┐ │Interface Attribute Value │ ├───────────────────────────────┼───────────────┼────────────────┤ │towlower() │ Thread safety │ MT-Safe locale │ ├───────────────────────────────┼───────────────┼────────────────┤ │towlower_l() │ Thread safety │ MT-Safe │ └───────────────────────────────┴───────────────┴────────────────┘


Стандарты (Conforming to)

towlower(): C99, POSIX.1-2001 (XSI); present as an XSI extension in POSIX.1-2008, but marked obsolete.

towlower_l(): POSIX.1-2008.


Примечание (Note)

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.


Смотри также (See also)

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