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120 lines
3.7 KiB
Groff
120 lines
3.7 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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.\" 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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.\" @(#)fgetln.3 8.3 (Berkeley) 4/19/94
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.\"
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.TH FGETLN 3 "19 April 1997" GNO "Library Routines"
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.SH NAME
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.BR fgetln
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\- get a line from a stream
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.SH SYNOPSIS
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#include <stdio.h>
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.sp 1
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char *\fBfgetln\fR (FILE *\fIstream\fR, size_t *\fIlen\fR);
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.SH DESCRIPTION
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The
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.BR fgetln
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function
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returns a pointer to the next line from the stream referenced by
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.IR stream
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This line is
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.IR not
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a C string as it does not end with a terminating
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.BR NUL
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character.
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The length of the line, including the final newline,
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is stored in the memory location to which
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.I len
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points.
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(Note, however, that if the line is the last
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in a file that does not end in a newline,
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the returned text will not contain a newline.)
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.SH RETURN VALUES
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Upon successful completion a pointer is returned;
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this pointer becomes invalid after the next I/O operation on
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.I stream
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(whether successful or not)
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or as soon as the stream is closed.
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Otherwise,
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.BR NULL
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is returned.
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The
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.BR fgetln
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function
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does not distinguish between end-of-file and error; 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
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to determine which occurred.
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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 NULL
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until the condition is
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cleared with
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.BR clearerr (3).
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.LP
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The text to which the returned pointer points may be modified,
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provided that no changes are made beyond the returned size.
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These changes are lost as soon as the pointer becomes invalid.
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.SH ERRORS
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.RS
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.IP \fBEBADF\fR
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The argument
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.I stream
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is not a stream open for reading.
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.RE
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.LP
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The
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.BR fgetln
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function
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may also fail and set
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.IR errno
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for any of the errors specified for the routines
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.BR fflush (3),
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.BR malloc (3),
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.BR read (2),
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.BR stat (2),
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or
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.BR realloc (3).
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.SH SEE ALSO
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.BR ferror (3),
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.BR fgets (3),
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.BR fopen (3),
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.BR putc (3)
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.SH HISTORY
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The
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.BR fgetln
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function first appeared in 4.4BSD.
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