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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 orientation of stream.  It returns a positive
       value if stream is wide-character oriented, that is, if wide-character I/O is permitted but char I/O is  disal-
       lowed.  It returns a negative value if stream is byte oriented, i.e., if char I/O is permitted but wide-charac-
       ter 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-character I/O operation).

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

       When mode is non-zero, the fwide() function first attempts to set stream's orientation (to wide-character  ori-
       ented 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

       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 performed through the fwprintf(3) function with
       the %c and %s directives.

       fprintf(3), fwprintf(3)

       This page is part of release 3.22 of the Linux man-pages project.  A description of the project,  and  informa-
       tion about reporting bugs, can be found at

GNU                               2007-07-26                          FWIDE(3)