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WCSNRTOMBS
Section: Linux Programmer's Manual (3)
Updated: 2010-09-15
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NAME
wcsnrtombs - convert a wide-character string to a multibyte string
SYNOPSIS
#include <wchar.h>
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)):
wcsnrtombs():
-
- Since glibc 2.10:
-
_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
- Before glibc 2.10:
-
_GNU_SOURCE
DESCRIPTION
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 a NULL pointer,
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 succeeds,
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 Laq\0aq,
or the length limit forces a stop.
In this case *src is left pointing
to the next wide character to be converted, and the number of bytes written
to dest is returned.
3. The wide-character string has been completely converted, including the
terminating Laq\0aq (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 terminating aq\0aq byte, 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 a NULL pointer, a static anonymous
state only known to the wcsnrtombs function is used instead.
The programmer must ensure that there is room for at least len bytes
at dest.
RETURN VALUE
The
wcsnrtombs()
function returns
the number of bytes that make up the
converted part of multibyte sequence,
not including the terminating null byte.
If a wide character was encountered which
could not be converted,
(size_t) -1
is returned, and errno set to EILSEQ.
CONFORMING TO
This function is a GNU extension.
NOTES
The behavior of
wcsnrtombs()
depends on the
LC_CTYPE
category of the
current locale.
Passing NULL as ps is not multithread safe.
SEE ALSO
iconv(3),
wcsrtombs(3)
COLOPHON
This page is part of release 3.27 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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