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WCSRTOMBS(3) Linux Programmer's Manual WCSRTOMBS(3)
NAME
wcsrtombs - convert a wide-character string to a multibyte string
SYNOPSIS
#include <wchar.h>
size_t wcsrtombs(char *restrict dest, const wchar_t **restrict src,
size_t len, mbstate_t *restrict ps);
DESCRIPTION
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:
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. 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 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.
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 │ MT-Unsafe race:wcsrtombs/!ps │
└────────────┴───────────────┴───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, 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)
GNU 2021-03-22 WCSRTOMBS(3)