1 '\" te
   2 .\" Copyright 2014 Garrett D'Amore <garrett@damore.org>
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  11 .TH FGETWC 3C "Jun 24, 2014"
  12 .SH NAME
  13 fgetwc, fgetwc_l \- get a wide-character code from a stream
  14 .SH SYNOPSIS
  15 .LP
  16 .nf
  17 #include <stdio.h>
  18 #include <wchar.h>
  19 
  20 \fBwint_t\fR \fBfgetwc\fR(\fBFILE *\fR\fIstream\fR);
  21 .fi
  22 .LP
  23 .nf
  24 #include <stdio.h>
  25 #include <wchar.h>
  26 #include <xlocale.h>
  27 
  28 \fBwint_t\fR \fBfgetwc_l\fR(\fBFILE *\fR\fIstream\fR, \fBlocale_t\fR, \fIloc\fR);
  29 .fi
  30 
  31 .SH DESCRIPTION
  32 .sp
  33 .LP
  34 The \fBfgetwc()\fR and \fBfgetwc_l()\fR functions obtain the next
  35 character (if present) from the input stream pointed to by \fIstream\fR,
  36 convert that to the corresponding wide-character code and advance the
  37 associated file position indicator for the stream (if defined).
  38 Whereas \fBfgetwc()\fR uses the current locale, \fBfgetwc_l()\fR uses the
  39 locale specified by \fIloc\fR.
  40 .LP
  41 If an error occurs, the resulting value of the file position indicator for the
  42 stream is indeterminate.
  43 .LP
  44 The \fBfgetwc()\fR and \fBfgetwc_l()\fR functions may mark the \fBst_atime\fR
  45 field of the file
  46 associated with \fIstream\fR for update. The \fBst_atime\fR field will be
  47 marked for update by the first successful execution of \fBfgetwc()\fR,
  48 \fBfgetc\fR(3C), \fBfgets\fR(3C), \fBfgetws\fR(3C), \fBfread\fR(3C),
  49 \fBfscanf\fR(3C), \fBgetc\fR(3C), \fBgetchar\fR(3C), \fBgets\fR(3C), or
  50 \fBscanf\fR(3C) using \fIstream\fR that returns data not supplied by a prior
  51 call to \fBungetc\fR(3C) or \fBungetwc\fR(3C).
  52 .SH RETURN VALUES
  53 .LP
  54 Upon successful completion both functions return the
  55 wide-character code of the character read from the input stream pointed to by
  56 \fIstream\fR converted to a type \fBwint_t\fR.
  57 .LP
  58 For standard-conforming (see \fBstandards\fR(5)) applications, if the
  59 end-of-file indicator for the stream is set, \fBfgetwc()\fR and
  60 \fBfgetwc_l()\fR return \fBWEOF\fR whether or not the stream is at
  61 end-of-file.
  62 .LP
  63 If a read error occurs, the error indicator for the stream is set,
  64 \fBfgetwc()\fR and \fBfgetwc_l()\fR returns \fBWEOF\fR and sets
  65 \fBerrno\fR to indicate the error.
  66 .LP
  67 If an encoding error occurs, the error indicator for the stream is set,
  68 \fBfgetwc()\fR and \fBfgetwc_l()\fR return \fBWEOF\fR, and \fBerrno\fR is
  69 set to indicate the error.
  70 .SH ERRORS
  71 .LP
  72 The \fBfgetwc()\fR and \fBfgetwc_l()\fR functions will fail if data needs to be
  73 read and:
  74 .TP
  75 .B EAGAIN
  76 The \fBO_NONBLOCK\fR flag is set for the file descriptor underlying
  77 \fIstream\fR and the process would be delayed in the \fBfgetwc()\fR or
  78 \fBfgetwc_l()\fR operation.
  79 .TP
  80 .B EBADF
  81 The file descriptor underlying \fIstream\fR is not a valid file descriptor open
  82 for reading.
  83 .TP
  84 .B EINTR
  85 The read operation was terminated due to the receipt of a signal, and no data
  86 was transferred.
  87 .TP
  88 .B EIO
  89 A physical I/O error has occurred, or the process is in a background process
  90 group attempting to read from its controlling terminal and either the process
  91 is ignoring or blocking the \fBSIGTTIN\fR signal or the process group is
  92 orphaned.
  93 .TP
  94 .B EOVERFLOW
  95 The file is a regular file and an attempt was made to read at or beyond the
  96 offset maximum associated with the corresponding  \fIstream\fR.
  97 .LP
  98 The \fBfgetwc()\fR and \fBfgetwc_l()\fR functions may fail if:
  99 .TP
 100 .B ENOMEM
 101 Insufficient memory is available.
 102 .TP
 103 .B ENXIO
 104 A request was made of a non-existent device, or the request was outside the
 105 capabilities of the device.
 106 .TP
 107 .B EILSEQ
 108 The data obtained from the input stream does not form a valid character.
 109 .SH USAGE
 110 .sp
 111 .LP
 112 The \fBferror\fR(3C) or \fBfeof\fR(3C) functions must be used to distinguish
 113 between an error condition and an end-of-file condition.
 114 .SH ATTRIBUTES
 115 .sp
 116 .LP
 117 See \fBattributes\fR(5) for descriptions of the following attributes:
 118 .TS
 119 box;
 120 c | c
 121 l | l .
 122 ATTRIBUTE TYPE  ATTRIBUTE VALUE
 123 _
 124 CSI     Enabled
 125 _
 126 Interface Stability     See below.
 127 _
 128 MT-Level        MT-Safe
 129 .TE
 130 
 131 .LP
 132 The
 133 .B fgetwc()
 134 function is Standard.  The
 135 .B fgetwc_l()
 136 function is Uncommitted.
 137 .SH SEE ALSO
 138 .LP
 139 \fBfeof\fR(3C), \fBferror\fR(3C), \fBfgetc\fR(3C), \fBfgets\fR(3C),
 140 \fBfgetws\fR(3C), \fBfopen\fR(3C), \fBfread\fR(3C), \fBfscanf\fR(3C),
 141 \fBgetc\fR(3C), \fBgetchar\fR(3C), \fBgets\fR(3C), \fBscanf\fR(3C),
 142 \fBnewlocale\fR(3C), \fBsetlocale\fR(3C), \fBungetc\fR(3C), \fBungetwc\fR(3C),
 143 \fBuselocale\fR(3C), \fBattributes\fR(5),
 144 \fBstandards\fR(5)