определить количество байтов в следующем многобайтовом символе (determine number of bytes in next multibyte character)
Имя (Name)
mbrlen - determine number of bytes in next multibyte character
Синопсис (Synopsis)
#include <wchar.h>
size_t mbrlen(const char *restrict s, size_t n,
mbstate_t *restrict ps);
Описание (Description)
The mbrlen() function inspects at most n bytes of the multibyte
string starting at s and extracts the next complete multibyte
character. It updates the shift state *ps. If the multibyte
character is not the null wide character, it returns the number
of bytes that were consumed from s. If the multibyte character
is the null wide character, it resets the shift state *ps to the
initial state and returns 0.
If the n bytes starting at s do not contain a complete multibyte
character, mbrlen() returns (size_t) -2. This can happen even if
n >= MB_CUR_MAX, if the multibyte string contains redundant shift
sequences.
If the multibyte string starting at s contains an invalid
multibyte sequence before the next complete character, mbrlen()
returns (size_t) -1 and sets errno to EILSEQ. In this case, the
effects on *ps are undefined.
If ps is NULL, a static anonymous state known only to the
mbrlen() function is used instead.
Возвращаемое значение (Return value)
The mbrlen() function returns the number of bytes parsed from the
multibyte sequence starting at s, if a non-null wide character
was recognized. It returns 0, if a null wide character was
recognized. It returns (size_t) -1 and sets errno to EILSEQ, if
an invalid multibyte sequence was encountered. It returns
(size_t) -2 if it couldn't parse a complete multibyte character,
meaning that n should be increased.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌────────────────────┬───────────────┬───────────────────────────┐
│Interface │ Attribute │ Value │
├────────────────────┼───────────────┼───────────────────────────┤
│mbrlen() │ Thread safety │ MT-Unsafe race:mbrlen/!ps │
└────────────────────┴───────────────┴───────────────────────────┘
Стандарты (Conforming to)
POSIX.1-2001, POSIX.1-2008, C99.
Примечание (Note)
The behavior of mbrlen() depends on the LC_CTYPE category of the
current locale.
Смотри также (See also)
mbrtowc(3)
