код символа к символу (перезапускаемый) (character code to a character (restartable))
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)
wcrtomb — convert a wide-character code to a character
(restartable)
Синопсис (Synopsis)
#include <wchar.h>
size_t wcrtomb(char *restrict s, wchar_t wc, mbstate_t *restrict ps);
Описание (Description)
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.
If s is a null pointer, the wcrtomb() function shall be
equivalent to the call:
wcrtomb(buf, L'\0', ps)
where buf is an internal buffer.
If s is not a null pointer, the wcrtomb() function shall
determine the number of bytes needed to represent the character
that corresponds to the wide character given by wc (including any
shift sequences), and store the resulting bytes in the array
whose first element is pointed to by s. At most {MB_CUR_MAX}
bytes are stored. If wc is a null wide character, a null byte
shall be stored, preceded by any shift sequence needed to restore
the initial shift state. The resulting state described shall be
the initial conversion state.
If ps is a null pointer, the wcrtomb() function shall use its own
internal mbstate_t object, which is initialized at program start-
up to the initial conversion state. Otherwise, the mbstate_t
object pointed to by ps shall be used to completely describe the
current conversion state of the associated character sequence.
The implementation shall behave as if no function defined in this
volume of POSIX.1‐2017 calls wcrtomb().
The wcrtomb() function need not be thread-safe if called with a
NULL ps argument.
The behavior of this function shall be affected by the LC_CTYPE
category of the current locale.
The wcrtomb() function shall not change the setting of errno if
successful.
Возвращаемое значение (Return value)
The wcrtomb() function shall return the number of bytes stored in
the array object (including any shift sequences). When wc is not
a valid wide character, an encoding error shall occur. In this
case, the function shall store the value of the macro [EILSEQ] in
errno and shall return (size_t)-1; the conversion state shall be
undefined.
Ошибки (Error)
The wcrtomb() function shall fail if:
EILSEQ An invalid wide-character code is detected.
The wcrtomb() function may fail if:
EINVAL ps points to an object that contains an invalid conversion
state.
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)
mbsinit(3p), wcsrtombs(3p)
The Base Definitions volume of POSIX.1‐2017, wchar.h(0p)
