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

       fwide - set and determine the orientation of a FILE stream

       #include <wchar.h>

       int fwide(FILE *stream, int mode);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       fwide(): _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or cc -std=c99

       When mode is zero, the fwide() function determines the current orienta-
       tion of stream.  It returns a positive value if stream is  wide-charac-
       ter  oriented, that is, if wide-character I/O is permitted but char I/O
       is disallowed.  It returns a negative value if stream is byte oriented,
       i.e.,  if  char  I/O is permitted but wide-character I/O is disallowed.
       It returns zero if stream has no orientation yet; in this case the next
       I/O operation might change the orientation (to byte oriented if it is a
       char I/O operation, or to wide-character oriented if it is a wide-char-
       acter I/O operation).

       Once  a  stream  has  an orientation, it cannot be changed and persists
       until the stream is closed.

       When mode is nonzero,  the  fwide()  function  first  attempts  to  set
       stream's  orientation  (to  wide-character  oriented if mode is greater
       than 0, or to byte oriented if mode is less than 0).  It then returns a
       value denoting the current orientation, as above.

       The  fwide()  function returns the stream's orientation, after possibly
       changing it.  A positive return value means wide-character oriented.  A
       negative  return  value  means  byte  oriented.  A return value of zero
       means undecided.

       C99, POSIX.1-2001.

       Wide-character output to  a  byte  oriented  stream  can  be  performed
       through the fprintf(3) function with the %lc and %ls directives.

       Char  oriented  output  to a wide-character oriented stream can be per-
       formed through the fwprintf(3) function with the %c and %s  directives.

       fprintf(3), fwprintf(3)

       This  page  is  part of release 3.25 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

GNU                               2007-07-26                          FWIDE(3)

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