1 '\" te 2 .\" Copyright 2014 Garrett D'Amore <garrett@damore.org> 3 .\" Copyright (c) 2003, X/Open Company Limited. All Rights Reserved. Portions Copyright (c) 1996, Sun Microsystems, Inc. All Rights Reserved. 4 .\" Sun Microsystems, Inc. gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at 5 .\" http://www.opengroup.org/bookstore/. 6 .\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html. 7 .\" This notice shall appear on any product containing this material. 8 .\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). 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If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner] 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\R. 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)