строка символов (character string)
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)
mbstowcs — convert a character string to a wide-character string
Синопсис (Synopsis)
#include <stdlib.h>
size_t mbstowcs(wchar_t *restrict pwcs, const char *restrict s,
size_t n);
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.
The mbstowcs() function shall convert a sequence of characters
that begins in the initial shift state from the array pointed to
by s into a sequence of corresponding wide-character codes and
shall store not more than n wide-character codes into the array
pointed to by pwcs. No characters that follow a null byte (which
is converted into a wide-character code with value 0) shall be
examined or converted. Each character shall be converted as if by
a call to mbtowc(), except that the shift state of mbtowc() is
not affected.
No more than n elements shall be modified in the array pointed to
by pwcs. If copying takes place between objects that overlap,
the behavior is undefined.
The behavior of this function shall be affected by the LC_CTYPE
category of the current locale. If pwcs is a null pointer,
mbstowcs() shall return the length required to convert the entire
array regardless of the value of n, but no values are stored.
Возвращаемое значение (Return value)
If an invalid character is encountered, mbstowcs() shall return
(size_t)-1 and shall set errno to indicate the error.
Otherwise, mbstowcs() shall return the number of the array
elements modified (or required if pwcs is null), not including a
terminating 0 code, if any. The array shall not be zero-
terminated if the value returned is n.
Ошибки (Error)
The mbstowcs() function shall fail if:
EILSEQ An invalid character sequence is detected. In the POSIX
locale an [EILSEQ] error cannot occur since all byte
values are valid characters.
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)
mblen(3p), mbtowc(3p), wctomb(3p), wcstombs(3p)
The Base Definitions volume of POSIX.1‐2017, stdlib.h(0p)
