44c8e812fd
When adding getline(3) and dprintf(3) into libc, those guards were added to prevent breaking too many ports. 7 years later the ports tree have been fixed, it is time to remove this FreeBSDism While here remove the extra parenthesis surrounding dprintf(3)
138 lines
3.6 KiB
Groff
138 lines
3.6 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 July 30, 2016
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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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.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 stored in the buffer, 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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free(line);
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.Ed
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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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