5310132318
These functions first appeared in the First Edition of Unix (or earlier in the pdp-7 version). Just claim 1st Edition for all this. The pdp-7 code is too fragmented at this point to extend history that far back.
122 lines
3.3 KiB
Groff
122 lines
3.3 KiB
Groff
.\" $NetBSD: getwc.3,v 1.3 2002/02/07 07:00:26 ross Exp $
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.\"
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.\" Copyright (c) 1990, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Chris Torek and the American National Standards Committee X3,
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.\" on Information Processing Systems.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)getc.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd March 3, 2004
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.Dt GETWC 3
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.Os
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.Sh NAME
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.Nm fgetwc ,
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.Nm getwc ,
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.Nm getwchar
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.Nd get next wide character from input stream
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In stdio.h
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.In wchar.h
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.Ft wint_t
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.Fn fgetwc "FILE *stream"
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.Ft wint_t
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.Fn getwc "FILE *stream"
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.Ft wint_t
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.Fn getwchar void
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.Sh DESCRIPTION
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The
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.Fn fgetwc
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function
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obtains the next input wide character (if present) from the stream pointed at by
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.Fa stream ,
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or the next character pushed back on the stream via
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.Xr ungetwc 3 .
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.Pp
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The
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.Fn getwc
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function
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acts essentially identically to
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.Fn fgetwc .
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.Pp
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The
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.Fn getwchar
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function
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is equivalent to
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.Fn getwc
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with the argument
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.Dv stdin .
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.Sh RETURN VALUES
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If successful, these routines return the next wide character
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from the
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.Fa stream .
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If the stream is at end-of-file or a read error occurs,
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the routines return
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.Dv WEOF .
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The routines
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.Xr feof 3
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and
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.Xr ferror 3
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must be used to distinguish between end-of-file and error.
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If an error occurs, the global variable
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.Va errno
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is set to indicate the error.
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The end-of-file condition is remembered, even on a terminal, and all
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subsequent attempts to read will return
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.Dv WEOF
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until the condition is cleared with
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.Xr clearerr 3 .
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.Sh SEE ALSO
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.Xr ferror 3 ,
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.Xr fopen 3 ,
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.Xr fread 3 ,
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.Xr getc 3 ,
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.Xr putwc 3 ,
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.Xr stdio 3 ,
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.Xr ungetwc 3
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.Sh STANDARDS
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The
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.Fn fgetwc ,
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.Fn getwc
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and
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.Fn getwchar
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functions
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conform to
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.St -isoC-99 .
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.Sh HISTORY
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A version of the
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.Fn getc
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and
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.Fn getw
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functions appeared in
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.At v1 .
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