1FWIDE(P)                   POSIX Programmer's Manual                  FWIDE(P)
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NAME

6       fwide - set stream orientation
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SYNOPSIS

9       #include <stdio.h>
10       #include <wchar.h>
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12       int fwide(FILE *stream, int mode);
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DESCRIPTION

16       The  fwide()  function  shall  determine  the orientation of the stream
17       pointed to by stream. If mode is greater than zero, the function  first
18       attempts  to make the stream wide-oriented.  If mode is less than zero,
19       the function first attempts to make the  stream  byte-oriented.  Other‐
20       wise,  mode  is zero and the function does not alter the orientation of
21       the stream.
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23       If the orientation of the stream has already been  determined,  fwide()
24       shall not change it.
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26       Since  no return value is reserved to indicate an error, an application
27       wishing to check for error situations should set errno to 0, then  call
28       fwide(),  then  check errno, and if it is non-zero, assume an error has
29       occurred.
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RETURN VALUE

32       The fwide() function shall return a value greater than zero  if,  after
33       the  call,  the  stream has wide-orientation, a value less than zero if
34       the stream has byte-orientation, or zero if the stream has no  orienta‐
35       tion.
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ERRORS

38       The fwide() function may fail if:
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40       EBADF  The stream argument is not a valid stream.
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43       The following sections are informative.
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EXAMPLES

46       None.
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APPLICATION USAGE

49       A  call  to  fwide() with mode set to zero can be used to determine the
50       current orientation of a stream.
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RATIONALE

53       None.
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FUTURE DIRECTIONS

56       None.
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SEE ALSO

59       The Base Definitions volume of IEEE Std 1003.1-2001, <wchar.h>
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62       Portions of this text are reprinted and reproduced in  electronic  form
63       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
64       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
65       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
66       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
67       event of any discrepancy between this version and the original IEEE and
68       The Open Group Standard, the original IEEE and The Open Group  Standard
69       is  the  referee document. The original Standard can be obtained online
70       at http://www.opengroup.org/unix/online.html .
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74IEEE/The Open Group                  2003                             FWIDE(P)
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