WCSTOMBS
Section: Linux Programmer's Manual (3)
Updated: 2017-09-15
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NAME
wcstombs - convert a wide-character string to a multibyte string
SYNOPSIS
#include <stdlib.h>
size_t wcstombs(char *dest, const wchar_t *src, size_t n);
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 (Laq\0aq).
In this case, the conversion ends in the initial shift state.
The number of bytes written to
dest,
excluding the terminating null byte (aq\0aq), 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.
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.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
wcstombs()
| Thread safety | MT-Safe
|
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C99.
NOTES
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.
SEE ALSO
mblen(3),
mbstowcs(3),
mbtowc(3),
wcsrtombs(3)
wctomb(3)
COLOPHON
This page is part of release 4.13 of the Linux
man-pages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
https://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ATTRIBUTES
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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