преобразовать строку широких символов в многобайтовую строку (convert a wide-character string to a multibyte string)
Имя (Name)
wcstombs - convert a wide-character string to a multibyte string
Синопсис (Synopsis)
#include <stdlib.h>
size_t wcstombs(char *restrict dest, const wchar_t *restrict src,
size_t n);
Описание (Description)
If dest is not NULL, the wcstombs() function converts the wide-
character string src to a multibyte string starting at dest. At
most n bytes are written to dest. The sequence of characters
placed in dest begins in the initial shift state. The conversion
can stop for three reasons:
1. A wide character has been encountered that can not be
represented as a multibyte sequence (according to the current
locale). In this case, (size_t) -1 is returned.
2. The length limit forces a stop. In this case, the number of
bytes written to dest is returned, but the shift state at this
point is lost.
3. The wide-character string has been completely converted,
including the terminating null wide character (L'\0'). In
this case, the conversion ends in the initial shift state.
The number of bytes written to dest, excluding the terminating
null byte ('\0'), is returned.
The programmer must ensure that there is room for at least n
bytes at dest.
If dest is NULL, n is ignored, and the conversion proceeds as
above, except that the converted bytes are not written out to
memory, and no length limit exists.
In order to avoid the case 2 above, the programmer should make
sure n is greater than or equal to wcstombs(NULL,src,0)+1.
Возвращаемое значение (Return value)
The wcstombs() function returns the number of bytes that make up
the converted part of a multibyte sequence, not including the
terminating null byte. If a wide character was encountered which
could not be converted, (size_t) -1 is returned.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│wcstombs() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
POSIX.1-2001, POSIX.1-2008, C99.
Примечание (Note)
The behavior of wcstombs() depends on the LC_CTYPE category of
the current locale.
The function wcsrtombs(3) provides a better interface to the same
functionality.
Смотри также (See also)
mblen(3), mbstowcs(3), mbtowc(3), wcsrtombs(3), wctomb(3)
