WCSRTOMBS(3)               Linux Programmer's Manual              WCSRTOMBS(3)

       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  a  NULL pointer, 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   wcr-
       tomb(dest,*src,ps),  as long as this call succeeds, and then increment-
       ing 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  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 '\0' byte, is

       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 a NULL pointer, a static anonymous
       state only known to the wcsrtombs function is used instead.

       The programmer must ensure that there is room for at least len bytes at

       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 con-
       verted, (size_t)(-1) is returned, and errno set to EILSEQ.

       ISO/ANSI C, UNIX98

       wcstombs(3), wcsnrtombs(3), iconv(3)

       The behaviour of wcsrtombs depends on the LC_CTYPE category of the cur-
       rent locale.

       Passing NULL as ps is not multi-thread safe.

GNU                               1999-07-25                      WCSRTOMBS(3)