wcsrtombs - convert a wide-character string to a multibyte string
#include <wchar.h>
size_t wcsrtombs(char *dest, const wchar_t **src,
size_t len, mbstate_t *ps);
If dest
is not NULL, the wcsrtombs() function converts 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:
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.
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.
The wide-character string has been completely converted, including the terminating null wide character (L'\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 bytes written to dest
, excluding the terminating 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 length 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 len
bytes at dest
.
For an explanation of the terms used in this section, see attributes(7).
Interface | Attribute | Value |
wcsrtombs() | Thread safety | MT-Unsafe race:wcsrtombs/!ps |
POSIX.1-2001, POSIX.1-2008, C99.
The behavior of wcsrtombs() depends on the LC_CTYPE category of the current locale.
Passing NULL as ps
is not multithread safe.
iconv(3), mbsinit(3), wcrtomb(3), wcsnrtombs(3), wcstombs(3)
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