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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).

       β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
       β”‚Interface   β”‚ Attribute     β”‚ Value                                                                                                                             β”‚
       β”œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”Όβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”Όβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€
       β”‚wcsrtombs() β”‚ Thread safety β”‚ MT-Unsafe race:wcsrtombs/!ps                                                                                                      β”‚
       β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”΄β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”΄β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜

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)