код символа в нижний регистр (character code to lowercase)
Пролог (Prolog)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
Имя (Name)
towlower, towlower_l — transliterate uppercase wide-character
code to lowercase
Синопсис (Synopsis)
#include <wctype.h>
wint_t towlower(wint_t wc);
wint_t towlower_l(wint_t wc, locale_t locale);
Описание (Description)
For towlower(): The functionality described on this reference
page is aligned with the ISO C standard. Any conflict between the
requirements described here and the ISO C standard is
unintentional. This volume of POSIX.1‐2017 defers to the ISO C
standard.
The towlower() and towlower_l() functions have as a domain a type
wint_t, the value of which the application shall ensure is a
character representable as a wchar_t, and a wide-character code
corresponding to a valid character in the locale used by the
function or the value of WEOF. If the argument has any other
value, the behavior is undefined. If the argument of towlower()
or towlower_l() represents an uppercase wide-character code, and
there exists a corresponding lowercase wide-character code as
defined by character type information in the current locale or in
the locale represented by locale, respectively (category
LC_CTYPE), the result shall be the corresponding lowercase wide-
character code. All other arguments in the domain are returned
unchanged.
The behavior is undefined if the locale argument to towlower_l()
is the special locale object LC_GLOBAL_LOCALE or is not a valid
locale object handle.
Возвращаемое значение (Return value)
Upon successful completion, the towlower() and towlower_l()
functions shall return the lowercase letter corresponding to the
argument passed; otherwise, they shall return the argument
unchanged.
Ошибки (Error)
No errors are defined.
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
setlocale(3p), uselocale(3p)
The Base Definitions volume of POSIX.1‐2017, Chapter 7, Locale,
locale.h(0p), wctype.h(0p)
