166 lines
4.2 KiB
Groff
166 lines
4.2 KiB
Groff
.\" Copyright (c) 2009 David Schultz <das@FreeBSD.org>
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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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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.\" $FreeBSD$
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.\"
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.Dd November 30, 2010
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.Dt GETLINE 3
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.Os
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.Sh NAME
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.Nm getdelim ,
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.Nm getline
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.Nd get a line from a stream
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd "#define _WITH_GETLINE"
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.In stdio.h
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.Ft ssize_t
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.Fn getdelim "char ** restrict linep" "size_t * restrict linecapp" "int delimiter" " FILE * restrict stream"
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.Ft ssize_t
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.Fn getline "char ** restrict linep" "size_t * restrict linecapp" " FILE * restrict stream"
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.Sh DESCRIPTION
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The
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.Fn getdelim
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function reads a line from
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.Fa stream ,
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delimited by the character
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.Fa delimiter .
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The
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.Fn getline
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function is equivalent to
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.Fn getdelim
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with the newline character as the delimiter.
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The delimiter character is included as part of the line, unless
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the end of the file is reached.
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.Pp
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The caller may provide a pointer to a malloced buffer for the line in
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.Fa *linep ,
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and the capacity of that buffer in
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.Fa *linecapp .
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These functions expand the buffer as needed, as if via
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.Fn realloc .
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If
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.Fa linep
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points to a
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.Dv NULL
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pointer, a new buffer will be allocated.
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In either case,
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.Fa *linep
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and
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.Fa *linecapp
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will be updated accordingly.
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.Sh RETURN VALUES
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The
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.Fn getdelim
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and
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.Fn getline
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functions return the number of characters written, excluding the
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terminating
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.Dv NUL
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character.
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The value \-1 is returned if an error occurs, or if end-of-file is reached.
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.Sh EXAMPLES
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The following code fragment reads lines from a file and
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writes them to standard output.
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The
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.Fn fwrite
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function is used in case the line contains embedded
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.Dv NUL
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characters.
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.Bd -literal -offset indent
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char *line = NULL;
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size_t linecap = 0;
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ssize_t linelen;
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while ((linelen = getline(&line, &linecap, fp)) > 0)
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fwrite(line, linelen, 1, stdout);
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.Ed
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.Sh COMPATIBILITY
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Many application writers used the name
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.Va getline
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before the
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.Fn getline
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function was introduced in
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.St -p1003.1 ,
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so a prototype is not provided by default in order to avoid
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compatibility problems.
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Applications that wish to use the
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.Fn getline
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function described herein should either request a strict
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.St -p1003.1-2008
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environment by defining the macro
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.Dv _POSIX_C_SOURCE
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to the value 200809 or greater, or by defining the macro
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.Dv _WITH_GETLINE ,
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prior to the inclusion of
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.In stdio.h .
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For compatibility with GNU libc, defining either
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.Dv _BSD_SOURCE
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or
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.Dv _GNU_SOURCE
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prior to the inclusion of
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.In stdio.h
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will also make
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.Fn getline
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available.
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.Sh ERRORS
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These functions may fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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Either
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.Fa linep
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or
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.Fa linecapp
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is
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.Dv NULL .
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.It Bq Er EOVERFLOW
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No delimiter was found in the first
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.Dv SSIZE_MAX
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characters.
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.El
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.Pp
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These functions may also fail due to any of the errors specified for
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.Fn fgets
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and
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.Fn malloc .
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.Sh SEE ALSO
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.Xr fgetln 3 ,
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.Xr fgets 3 ,
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.Xr malloc 3
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.Sh STANDARDS
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The
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.Fn getdelim
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and
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.Fn getline
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functions conform to
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.St -p1003.1-2008 .
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.Sh HISTORY
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These routines first appeared in
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.Fx 8.0 .
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.Sh BUGS
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There are no wide character versions of
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.Fn getdelim
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or
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.Fn getline .
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