125 lines
3.7 KiB
Groff
125 lines
3.7 KiB
Groff
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.\" Copyright (c) 1990, 1991 The Regents of the University of California.
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.\" 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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.\" @(#)fgetline.3 5.4 (Berkeley) 4/19/91
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.\"
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.Dd April 19, 1991
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.Dt FGETLINE 3
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.Os
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.Sh NAME
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.Nm fgetline
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.Nd get a line from a stream
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.Sh SYNOPSIS
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.Fd #include <stdio.h>
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.Ft char *
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.Fn fgetline "FILE *stream" "size_t *len"
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.Sh DESCRIPTION
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The
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.Fn fgetline
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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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.Fa stream .
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The newline character at the end of the line is replaced by a
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.Dv NUL .
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.Pp
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If
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.Fa len
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is non-NULL, the length of the line, not counting the terminating
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.Dv NUL ,
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is stored in the memory location it references.
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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
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.Tn I/O
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operation on
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.Fa 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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.Dv NULL
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is returned.
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The
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.Fn fgetline
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function
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does not distinguish between end-of-file and error; 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
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to determine which occurred.
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If an error occurrs, 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 NULL
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until the condition is
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cleared with
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.Xr clearerr 3 .
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.Pp
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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 terminating
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.Dv NUL .
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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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.Bl -tag -width [EBADF]
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.It Bq Er EBADF
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The argument
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.Fa stream
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is not a stream open for reading.
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.El
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.Pp
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The
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.Fn fgetline
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function
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may also fail and set
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.Va errno
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for any of the errors specified for the routines
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.Xr fflush 3 ,
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.Xr malloc 3 ,
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.Xr read 2 ,
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.Xr stat 2 ,
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or
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.Xr realloc 3 .
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.Sh SEE ALSO
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.Xr ferror 3 ,
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.Xr fgets 3 ,
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.Xr fopen 3 ,
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.Xr putc 3
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.Sh HISTORY
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The
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.Fn fgetline
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function is
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.Ud .
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.Sh BUGS
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It is not possible to tell whether the final line of an input file
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was terminated with a newline.
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