freebsd-dev/lib/libc/stdio/getwc.3
Warner Losh 5310132318 Note some functions that appeared in First Edition Unix
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.
2020-04-01 22:50:41 +00:00

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.\" $NetBSD: getwc.3,v 1.3 2002/02/07 07:00:26 ross Exp $
.\"
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.\" The Regents of the University of California. All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Chris Torek and the American National Standards Committee X3,
.\" on Information Processing Systems.
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.\" modification, are permitted provided that the following conditions
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.\" @(#)getc.3 8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
.Dd March 3, 2004
.Dt GETWC 3
.Os
.Sh NAME
.Nm fgetwc ,
.Nm getwc ,
.Nm getwchar
.Nd get next wide character from input stream
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In stdio.h
.In wchar.h
.Ft wint_t
.Fn fgetwc "FILE *stream"
.Ft wint_t
.Fn getwc "FILE *stream"
.Ft wint_t
.Fn getwchar void
.Sh DESCRIPTION
The
.Fn fgetwc
function
obtains the next input wide character (if present) from the stream pointed at by
.Fa stream ,
or the next character pushed back on the stream via
.Xr ungetwc 3 .
.Pp
The
.Fn getwc
function
acts essentially identically to
.Fn fgetwc .
.Pp
The
.Fn getwchar
function
is equivalent to
.Fn getwc
with the argument
.Dv stdin .
.Sh RETURN VALUES
If successful, these routines return the next wide character
from the
.Fa stream .
If the stream is at end-of-file or a read error occurs,
the routines return
.Dv WEOF .
The routines
.Xr feof 3
and
.Xr ferror 3
must be used to distinguish between end-of-file and error.
If an error occurs, the global variable
.Va errno
is set to indicate the error.
The end-of-file condition is remembered, even on a terminal, and all
subsequent attempts to read will return
.Dv WEOF
until the condition is cleared with
.Xr clearerr 3 .
.Sh SEE ALSO
.Xr ferror 3 ,
.Xr fopen 3 ,
.Xr fread 3 ,
.Xr getc 3 ,
.Xr putwc 3 ,
.Xr stdio 3 ,
.Xr ungetwc 3
.Sh STANDARDS
The
.Fn fgetwc ,
.Fn getwc
and
.Fn getwchar
functions
conform to
.St -isoC-99 .
.Sh HISTORY
A version of the
.Fn getc
and
.Fn getw
functions appeared in
.At v1 .