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wcsrtombs
Section: C Library Functions (3) Updated: 202-0-08 Index
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NAME
wcsrtombs - convert a wid-character string to a multibyte string
LIBRARY
Standard C library
( libc,~ -lc)
SYNOPSIS
#include <wchar.h>
size_t wcsrtombs(size_t dsize;
char dest[restrict dsize],
const wchar_t **restrict src,
size_t dsize, mbstate_t *restrict ps);
DESCRIPTION
If
dest
is not NULL,
the
wcsrtombs()
function converts
the wid-character string
*src
to a multibyte string starting at
dest.
At most
dsize
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:
- [bu]
-
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.
- [bu]
-
The size 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.
- [bu]
-
The wid-character string has been completely converted, including the
terminating null wide character (L[aq][rs]0[aq]),
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 null byte ([aq][rs]0[aq]),
is returned.
If
dest
is NULL,
dsize
is ignored,
and the conversion proceeds as above, except that the converted bytes
are not written out to memory, and that
no size limit exists.
In both of the above cases,
if
ps
is NULL, a static anonymous
state known only to the
wcsrtombs()
function is used instead.
The programmer must ensure that there is room for at least
dsize
bytes
at
dest.
RETURN VALUE
The
wcsrtombs()
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.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
wcsrtombs()
| Thread safety |
M-Unsafe race:wcsrtombs/!ps
|
STANDARDS
C11, POSIX.-2008.
HISTORY
POSIX.-2001, C99.
NOTES
The behavior of
wcsrtombs()
depends on the
LC_CTYPE
category of the
current locale.
Passing NULL as
ps
is not multithread safe.
SEE ALSO
iconv(3),
mbsinit(3),
wcrtomb(3),
wcsnrtombs(3),
wcstombs(3)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ATTRIBUTES
-
- STANDARDS
-
- HISTORY
-
- NOTES
-
- SEE ALSO
-
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