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11 .TH FGETWC 3C "Jun 24, 2014"
13 fgetwc, fgetwc_l \- get a wide-character code from a stream
20 \fBwint_t\fR \fBfgetwc\fR(\fBFILE *\fR\fIstream\fR);
28 \fBwint_t\fR \fBfgetwc_l\fR(\fBFILE *\fR\fIstream\fR, \fBlocale_t\fR, \fIloc\fR);
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.
41 If an error occurs, the resulting value of the file position indicator for the
42 stream is indeterminate.
44 The \fBfgetwc()\fR and \fBfgetwc_l()\fR functions may mark the \fBst_atime\fR
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).
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.
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
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.
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.
72 The \fBfgetwc()\fR and \fBfgetwc_l()\fR functions will fail if data needs to be
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.
81 The file descriptor underlying \fIstream\fR is not a valid file descriptor open
85 The read operation was terminated due to the receipt of a signal, and no data
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
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.
98 The \fBfgetwc()\fR and \fBfgetwc_l()\fR functions may fail if:
101 Insufficient memory is available.
104 A request was made of a non-existent device, or the request was outside the
105 capabilities of the device.
108 The data obtained from the input stream does not form a valid character.
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.
117 See \fBattributes\fR(5) for descriptions of the following attributes:
122 ATTRIBUTE TYPE ATTRIBUTE VALUE
126 Interface Stability See below.
134 function is Standard. The
136 function is Uncommitted.
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),