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size_t wcsnrtombs(char *dest, const wchar_t **src, size_t nwc,
size_t len, mbstate_t *ps);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
Since glibc 2.10:
_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
The wcsnrtombs() function is like the wcsrtombs(3) function, except
that the number of wide characters to be converted, starting at *src,
is limited to nwc.
If dest is not NULL, the wcsnrtombs() function converts at most nwc
wide characters from the wide-character string *src to a multibyte
string starting at dest. At most len bytes are written to dest. The
shift state *ps is updated. The conversion is effectively performed by
repeatedly calling wcrtomb(dest, *src, ps), as long as this call suc-
ceeds, and then incrementing dest by the number of bytes written and
*src by one. 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 *src is left pointing to the invalid wide character,
(size_t) -1 is returned, and errno is set to EILSEQ.
2. nwc wide characters have been converted without encountering a null
wide character (L'\0'), or the length limit forces a stop. In this
case *src is left pointing to the next wide character to be con-
verted, and the number of bytes written to dest is returned.
3. The wide-character string has been completely converted, including
the terminating null wide character (which has the side effect of
bringing back *ps to the initial state). In this case *src is set
to NULL, and the number of bytes written to dest, excluding the ter-
minating null byte ('\0'), is returned.
If dest is NULL, len is ignored, and the conversion proceeds as above,
except that the converted bytes are not written out to memory, and that
no destination length limit exists.
In both of the above cases, if ps is NULL, a static anonymous state
known only to the wcsnrtombs() function is used instead.
The programmer must ensure that there is room for at least len bytes at
Passing NULL as ps is not multithread safe.
iconv(3), mbsinit(3), wcsrtombs(3)
GNU 2014-03-18 WCSNRTOMBS(3)