mirror of
https://github.com/GnoConsortium/gno.git
synced 2024-12-21 07:30:05 +00:00
120 lines
3.7 KiB
Groff
120 lines
3.7 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)fgetln.3 8.3 (Berkeley) 4/19/94
|
|
.\"
|
|
.TH FGETLN 3 "19 April 1997" GNO "Library Routines"
|
|
.SH NAME
|
|
.BR fgetln
|
|
\- get a line from a stream
|
|
.SH SYNOPSIS
|
|
#include <stdio.h>
|
|
.sp 1
|
|
char *\fBfgetln\fR (FILE *\fIstream\fR, size_t *\fIlen\fR);
|
|
.SH DESCRIPTION
|
|
The
|
|
.BR fgetln
|
|
function
|
|
returns a pointer to the next line from the stream referenced by
|
|
.IR stream
|
|
This line is
|
|
.IR not
|
|
a C string as it does not end with a terminating
|
|
.BR NUL
|
|
character.
|
|
The length of the line, including the final newline,
|
|
is stored in the memory location to which
|
|
.I len
|
|
points.
|
|
(Note, however, that if the line is the last
|
|
in a file that does not end in a newline,
|
|
the returned text will not contain a newline.)
|
|
.SH RETURN VALUES
|
|
Upon successful completion a pointer is returned;
|
|
this pointer becomes invalid after the next I/O operation on
|
|
.I stream
|
|
(whether successful or not)
|
|
or as soon as the stream is closed.
|
|
Otherwise,
|
|
.BR NULL
|
|
is returned.
|
|
The
|
|
.BR fgetln
|
|
function
|
|
does not distinguish between end-of-file and error; the routines
|
|
.BR feof (3)
|
|
and
|
|
.BR ferror (3)
|
|
must be used
|
|
to determine which occurred.
|
|
If an error occurs, the global variable
|
|
.IR 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
|
|
.BR NULL
|
|
until the condition is
|
|
cleared with
|
|
.BR clearerr (3).
|
|
.LP
|
|
The text to which the returned pointer points may be modified,
|
|
provided that no changes are made beyond the returned size.
|
|
These changes are lost as soon as the pointer becomes invalid.
|
|
.SH ERRORS
|
|
.RS
|
|
.IP \fBEBADF\fR
|
|
The argument
|
|
.I stream
|
|
is not a stream open for reading.
|
|
.RE
|
|
.LP
|
|
The
|
|
.BR fgetln
|
|
function
|
|
may also fail and set
|
|
.IR errno
|
|
for any of the errors specified for the routines
|
|
.BR fflush (3),
|
|
.BR malloc (3),
|
|
.BR read (2),
|
|
.BR stat (2),
|
|
or
|
|
.BR realloc (3).
|
|
.SH SEE ALSO
|
|
.BR ferror (3),
|
|
.BR fgets (3),
|
|
.BR fopen (3),
|
|
.BR putc (3)
|
|
.SH HISTORY
|
|
The
|
|
.BR fgetln
|
|
function first appeared in 4.4BSD.
|