size_t mbsnrtowcs(wchar_t *dest, const char **src,
size_t nms, 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 mbsnrtowcs() function is like the mbsrtowcs(3) function, except
that the number of bytes to be converted, starting at *src, is limited
If dest is not a NULL pointer, the mbsnrtowcs() function converts at
most nms bytes from the multibyte string *src to a wide-character
string starting at dest. At most len wide characters are written to
dest. The shift state *ps is updated. The conversion is effectively
performed by repeatedly calling mbrtowc(dest, *src, n, ps) where n is
some positive number, as long as this call succeeds, and then incre-
menting dest by one and *src by the number of bytes consumed. The con-
version can stop for three reasons:
1. An invalid multibyte sequence has been encountered. In this case
*src is left pointing to the invalid multibyte sequence, (size_t) -1
is returned, and errno is set to EILSEQ.
2. The nms limit forces a stop, or len non-L'\0' wide characters have
been stored at dest. In this case *src is left pointing to the next
multibyte sequence to be converted, and the number of wide charac-
ters written to dest is returned.
3. The multibyte string has been completely converted, including the
terminating null wide character ('\0') (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 wide characters written to dest, exclud-
ing the terminating null wide character, is returned.
If dest is NULL, len is ignored, and the conversion proceeds as above,
except that the converted wide characters are not written out to mem-
ory, and that no destination length limit exists.
In both of the above cases, if ps is a NULL pointer, a static anonymous
state only known to the mbsnrtowcs function is used instead.
The programmer must ensure that there is room for at least len wide
characters at dest.
Passing NULL as ps is not multithread safe.
This page is part of release 3.35 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://man7.org/linux/man-pages/.
GNU 2011-10-01 MBSNRTOWCS(3)
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