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All Rights Reserved. .\" Copyright (c) 2003, X/Open Company Limited. All Rights Reserved. .\" Copyright 2014 Garrett D'Amore .\" .TH FGETWC 3C "Jun 24, 2014" .SH NAME fgetwc, fgetwc_l \- get a wide-character code from a stream .SH SYNOPSIS .LP .nf #include #include \fBwint_t\fR \fBfgetwc\fR(\fBFILE *\fR\fIstream\fR); .fi .LP .nf #include #include #include \fBwint_t\fR \fBfgetwc_l\fR(\fBFILE *\fR\fIstream\fR, \fBlocale_t\fR, \fIloc\fR); .fi .SH DESCRIPTION .sp .LP The \fBfgetwc()\fR and \fBfgetwc_l()\fR functions obtain the next character (if present) from the input stream pointed to by \fIstream\fR, convert that to the corresponding wide-character code and advance the associated file position indicator for the stream (if defined). Whereas \fBfgetwc()\fR uses the current locale, \fBfgetwc_l()\fR uses the locale specified by \fIloc\fR. .LP If an error occurs, the resulting value of the file position indicator for the stream is indeterminate. .LP The \fBfgetwc()\fR and \fBfgetwc_l()\fR functions may mark the \fBst_atime\fR field of the file associated with \fIstream\fR for update. The \fBst_atime\fR field will be marked for update by the first successful execution of \fBfgetwc()\fR, \fBfgetc\fR(3C), \fBfgets\fR(3C), \fBfgetws\fR(3C), \fBfread\fR(3C), \fBfscanf\fR(3C), \fBgetc\fR(3C), \fBgetchar\fR(3C), \fBgets\fR(3C), or \fBscanf\fR(3C) using \fIstream\fR that returns data not supplied by a prior call to \fBungetc\fR(3C) or \fBungetwc\fR(3C). .SH RETURN VALUES .LP Upon successful completion both functions return the wide-character code of the character read from the input stream pointed to by \fIstream\fR converted to a type \fBwint_t\fR. .LP For standard-conforming (see \fBstandards\fR(7)) applications, if the end-of-file indicator for the stream is set, \fBfgetwc()\fR and \fBfgetwc_l()\fR return \fBWEOF\fR whether or not the stream is at end-of-file. .LP If a read error occurs, the error indicator for the stream is set, \fBfgetwc()\fR and \fBfgetwc_l()\fR returns \fBWEOF\fR and sets \fBerrno\fR to indicate the error. .LP If an encoding error occurs, the error indicator for the stream is set, \fBfgetwc()\fR and \fBfgetwc_l()\fR return \fBWEOF\fR, and \fBerrno\fR is set to indicate the error. .SH ERRORS .LP The \fBfgetwc()\fR and \fBfgetwc_l()\fR functions will fail if data needs to be read and: .TP .B EAGAIN The \fBO_NONBLOCK\fR flag is set for the file descriptor underlying \fIstream\fR and the process would be delayed in the \fBfgetwc()\fR or \fBfgetwc_l()\fR operation. .TP .B EBADF The file descriptor underlying \fIstream\fR is not a valid file descriptor open for reading. .TP .B EINTR The read operation was terminated due to the receipt of a signal, and no data was transferred. .TP .B EIO A physical I/O error has occurred, or the process is in a background process group attempting to read from its controlling terminal and either the process is ignoring or blocking the \fBSIGTTIN\fR signal or the process group is orphaned. .TP .B EOVERFLOW The file is a regular file and an attempt was made to read at or beyond the offset maximum associated with the corresponding \fIstream\fR. .LP The \fBfgetwc()\fR and \fBfgetwc_l()\fR functions may fail if: .TP .B ENOMEM Insufficient memory is available. .TP .B ENXIO A request was made of a non-existent device, or the request was outside the capabilities of the device. .TP .B EILSEQ The data obtained from the input stream does not form a valid character. .SH USAGE .sp .LP The \fBferror\fR(3C) or \fBfeof\fR(3C) functions must be used to distinguish between an error condition and an end-of-file condition. .SH ATTRIBUTES .sp .LP See \fBattributes\fR(7) for descriptions of the following attributes: .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ CSI Enabled _ Interface Stability See below. _ MT-Level MT-Safe .TE .LP The .B fgetwc() function is Standard. The .B fgetwc_l() function is Uncommitted. .SH SEE ALSO .LP .BR feof (3C), .BR ferror (3C), .BR fgetc (3C), .BR fgets (3C), .BR fgetws (3C), .BR fopen (3C), .BR fread (3C), .BR fscanf (3C), .BR getc (3C), .BR getchar (3C), .BR gets (3C), .BR newlocale (3C), .BR scanf (3C), .BR setlocale (3C), .BR ungetc (3C), .BR ungetwc (3C), .BR uselocale (3C), .BR attributes (7), .BR standards (7)