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Linux 2.6 - man page for wcsrtombs (linux section 3posix)

WCSRTOMBS(P)			    POSIX Programmer's Manual			     WCSRTOMBS(P)

       wcsrtombs - convert a wide-character string to a character string (restartable)

       #include <wchar.h>

       size_t wcsrtombs(char *restrict dst, const wchar_t **restrict src,
	      size_t len, mbstate_t *restrict ps);

       The  wcsrtombs() function shall convert a sequence of wide characters from the array indi-
       rectly pointed to by src into a sequence of corresponding  characters,  beginning  in  the
       conversion  state  described by the object pointed to by ps. If dst is not a null pointer,
       the converted characters shall then be stored into the array pointed to by dst. Conversion
       continues  up  to  and  including  a  terminating null wide character, which shall also be
       stored. Conversion shall stop earlier in the following cases:

	* When a code is reached that does not correspond to a valid character

	* When the next character would exceed the limit of len total bytes to be stored  in  the
	  array pointed to by dst (and dst is not a null pointer)

       Each conversion shall take place as if by a call to the wcrtomb() function.

       If  dst	is  not  a  null  pointer, the pointer object pointed to by src shall be assigned
       either a null pointer (if conversion stopped due to reaching a terminating null wide char-
       acter)  or the address just past the last wide character converted (if any). If conversion
       stopped due to reaching a terminating null wide character, the resulting  state	described
       shall be the initial conversion state.

       If  ps  is  a  null pointer, the wcsrtombs() function shall use its own internal mbstate_t
       object, which is initialized at program start-up to the initial conversion  state.  Other-
       wise,  the mbstate_t object pointed to by ps shall be used to completely describe the cur-
       rent conversion state of the  associated  character  sequence.  The  implementation  shall
       behave as if no function defined in this volume of IEEE Std 1003.1-2001 calls wcsrtombs().

       If  the	application  uses any of the _POSIX_THREAD_SAFE_FUNCTIONS or _POSIX_THREADS func-
       tions, the application shall ensure that the wcsrtombs() function is called  with  a  non-
       NULL ps argument.

       The  behavior  of  this function shall be affected by the LC_CTYPE category of the current

       If conversion stops because a code is reached that does not correspond to a valid  charac-
       ter,  an  encoding  error  occurs.  In this case, the wcsrtombs() function shall store the
       value of the macro [EILSEQ] in errno and return (size_t)-1; the conversion state is  unde-
       fined. Otherwise, it shall return the number of bytes in the resulting character sequence,
       not including the terminating null (if any).

       The wcsrtombs() function may fail if:

       EINVAL ps points to an object that contains an invalid conversion state.

       EILSEQ A wide-character code does not correspond to a valid character.

       The following sections are informative.





       mbsinit() , wcrtomb() , the Base Definitions volume of IEEE Std 1003.1-2001, <wchar.h>

       Portions of this text are reprinted and	reproduced  in	electronic  form  from	IEEE  Std
       1003.1,	2003  Edition,	Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				     WCSRTOMBS(P)

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