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

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

       wctomb - convert a wide-character code to a character

       #include <stdlib.h>

       int wctomb(char *s, wchar_t wchar);

       The  wctomb() function shall determine the number of bytes needed to represent the charac-
       ter corresponding to the wide-character code whose value is wchar (including any change in
       the shift state). It shall store the character representation (possibly multiple bytes and
       any special bytes to change shift state) in the array object pointed to by s (if s is  not
       a  null	pointer).  At most {MB_CUR_MAX} bytes shall be stored. If wchar is 0, a null byte
       shall be stored, preceded by any shift sequence needed to restore the initial shift state,
       and wctomb() shall be left in the initial shift state.

       The  behavior of this function is affected by the LC_CTYPE category of the current locale.
       For a state-dependent encoding, this function shall be placed into its initial state by	a
       call  for  which  its  character pointer argument, s, is a null pointer.  Subsequent calls
       with s as other than a null pointer shall cause the internal state of the function  to  be
       altered	as necessary. A call with s as a null pointer shall cause this function to return
       a non-zero value if encodings  have  state  dependency,	and  0	otherwise.  Changing  the
       LC_CTYPE category causes the shift state of this function to be unspecified.

       The  wctomb()  function need not be reentrant. A function that is not required to be reen-
       trant is not required to be thread-safe.

       The  implementation  shall  behave  as  if  no  function  defined  in   this   volume   of
       IEEE Std 1003.1-2001 calls wctomb().

       If  s  is a null pointer, wctomb() shall return a non-zero or 0 value, if character encod-
       ings, respectively, do or do not have state-dependent  encodings.  If  s  is  not  a  null
       pointer,  wctomb()  shall  return  -1 if the value of wchar does not correspond to a valid
       character, or return the number of bytes that constitute the  character	corresponding  to
       the value of wchar.

       In no case shall the value returned be greater than the value of the {MB_CUR_MAX} macro.

       No errors are defined.

       The following sections are informative.





       mblen()	 ,  mbtowc()  ,  mbstowcs()  ,	wcstombs()  ,  the  Base  Definitions  volume  of
       IEEE Std 1003.1-2001, <stdlib.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					WCTOMB(P)

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