huschi.net

WCSXFRM(3P)                POSIX Programmer's Manual               WCSXFRM(3P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.
NAME
       wcsxfrm - wide-character string transformation
SYNOPSIS
       #include <wchar.h>
       size_t wcsxfrm(wchar_t *restrict ws1, const wchar_t *restrict ws2,
              size_t n);

DESCRIPTION
       The  wcsxfrm()  function  shall  transform  the  wide-character  string
       pointed  to  by  ws2 and place the resulting wide-character string into
       the array pointed to by ws1. The transformation shall be such  that  if
       wcscmp()  is applied to two transformed wide strings, it shall return a
       value greater than, equal to, or less  than  0,  corresponding  to  the
       result  of  wcscoll()  applied  to the same two original wide-character
       strings. No more than n wide-character codes shall be placed  into  the
       resulting array pointed to by ws1, including the terminating null wide-
       character code. If n is 0, ws1 is permitted to be a  null  pointer.  If
       copying takes place between objects that overlap, the behavior is unde-
       fined.
       The wcsxfrm() function shall not change the setting of  errno  if  suc-
       cessful.
       Since  no return value is reserved to indicate an error, an application
       wishing to check for error situations should set errno to 0, then  call
       wcsxfrm(), then check errno.
RETURN VALUE
       The wcsxfrm() function shall return the length of the transformed wide-
       character string (not including  the  terminating  null  wide-character
       code).  If  the  value returned is n or more, the contents of the array
       pointed to by ws1 are unspecified.
       On error, the wcsxfrm() function may set errno, but no return value  is
       reserved to indicate an error.
ERRORS
       The wcsxfrm() function may fail if:
       EINVAL The  wide-character string pointed to by ws2 contains wide-char-
              acter codes outside the domain of the collating sequence.

       The following sections are informative.
EXAMPLES
       None.
APPLICATION USAGE
       The transformation function is such that two transformed wide-character
       strings can be ordered by wcscmp() as appropriate to collating sequence
       information in the program's locale (category LC_COLLATE ).
       The fact that when n is 0 ws1 is permitted to be a null pointer is use-
       ful  to  determine the size of the ws1 array prior to making the trans-
       formation.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       wcscmp(),    wcscoll(),    the    Base    Definitions     volume     of
       IEEE Std 1003.1-2001, <wchar.h>
COPYRIGHT
       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 original Standard can be  obtained  online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group                  2003                          WCSXFRM(3P)