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134 lines
3.8 KiB
Groff
134 lines
3.8 KiB
Groff
.\" 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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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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.\"
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.TH GETC 3 "15 September 1997" GNO "Library Routines"
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.SH NAME
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.BR fgetc ,
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.BR getc ,
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.BR getchar ,
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.BR getw
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\- get next character or word from input stream
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.SH SYNOPSIS
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#include <stdio.h>
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.sp 1
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int \fBfgetc\fR (FILE *\fIstream\fR);
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.br
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int \fBgetc\fR (FILE *\fIstream\fR);
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.br
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int \fBgetchar\fR (void);
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.br
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int \fBgetw\fR (FILE *\fIstream\fR);
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.SH DESCRIPTION
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The
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.BR fgetc
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function
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obtains the next input character (if present) from the stream pointed at by
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.IR stream ,
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or the next character pushed back on the stream via
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.BR ungetc (3).
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.LP
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The
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.BR getc
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function
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acts essentially identically to
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.BR fgetc ,
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but is a macro that expands in-line.
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.LP
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The
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.BR getchar
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function
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is equivalent to:
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getc with the argument stdin.
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.LP
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The
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.BR getw
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function
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obtains the next
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.IR int
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(if present)
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from the stream pointed at by
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.IR stream .
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.SH RETURN VALUES
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If successful, these routines return the next requested object
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from the
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.IR 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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.BR EOF .
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The routines
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.BR feof (3)
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and
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.BR 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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.IR 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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.BR EOF
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until the condition is cleared with
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.BR clearerr (3).
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.SH SEE ALSO
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.BR ferror (3),
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.BR fread (3),
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.BR fopen (3),
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.BR putc (3),
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.BR ungetc (3)
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.SH STANDARDS
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The
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.BR fgetc ,
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.BR getc
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and
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.BR getchar
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functions
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conform to ANSI/C.
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.SH BUGS
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Since
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.BR EOF
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is a valid integer value,
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.BR feof (3)
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and
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.BR ferror (3)
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must be used to check for failure after calling
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.BR getw .
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The size and byte order of an
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.IR int
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varies from one machine to another, and
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.BR getw
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is not recommended for portable applications.
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.LP
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