1 '\" te
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  10 .TH FWIDE 3C "Jun 3, 2015"
  11 .SH NAME
  12 fwide \- set stream orientation
  13 .SH SYNOPSIS
  14 .LP
  15 .nf
  16 #include <stdio.h>
  17 #include <wchar.h>
  18 
  19 \fBint\fR \fBfwide\fR(\fBFILE *\fR\fIstream\fR, \fBint\fR \fImode\fR);
  20 .fi
  21 
  22 .SH DESCRIPTION
  23 .sp
  24 .LP
  25 The \fBfwide()\fR function determines the orientation of the stream pointed to
  26 by \fIstream\fR. If \fImode\fR is greater than 0, the function first attempts
  27 to make the stream wide-oriented.  If \fImode\fR is less than 0, the function
  28 first attempts to make the stream byte-oriented.  Otherwise, \fImode\fR is 0
  29 and the function does not alter the orientation of the stream.
  30 .sp
  31 .LP
  32 If the orientation of the stream has already been determined, \fBfwide()\fR
  33 does not change it.
  34 .sp
  35 .LP
  36 Because no return value is reserved to indicate an error, an application
  37 wishing to check for error situations should set \fBerrno\fR to 0, then call
  38 \fBfwide()\fR, then check \fBerrno\fR and if it is non-zero, assume an error
  39 has occurred.
  40 .SH RETURN VALUES
  41 .sp
  42 .LP
  43 The \fBfwide()\fR function returns a value greater than 0 if, after the call,
  44 the stream has wide-orientation, a value less than 0 if the stream has
  45 byte-orientation, or 0 if the stream has no orientation.
  46 .SH ERRORS
  47 .sp
  48 .LP
  49 The \fBfwide()\fR function may fail if:
  50 .sp
  51 .ne 2
  52 .na
  53 \fB\fBEBADF\fR\fR
  54 .ad
  55 .RS 9n
  56 The \fIstream\fR argument is not a valid stream.
  57 .RE
  58 
  59 .SH USAGE
  60 .sp
  61 .LP
  62 A call to \fBfwide()\fR with  \fImode\fR set to 0 can be used to determine the
  63 current orientation of a stream.
  64 .SH ATTRIBUTES
  65 .sp
  66 .LP
  67 See \fBattributes\fR(5) for descriptions of the following attributes:
  68 .sp
  69 
  70 .sp
  71 .TS
  72 box;
  73 c | c
  74 l | l .
  75 ATTRIBUTE TYPE  ATTRIBUTE VALUE
  76 _
  77 Interface Stability     Standard
  78 _
  79 MT-Level        MT-Safe
  80 .TE
  81 
  82 .SH SEE ALSO
  83 .sp
  84 .LP
  85 \fBattributes\fR(5), \fBstandards\fR(5)