Import csplit(1) from OpenBSD
Modified slightly to conform to the sbase style.
This commit is contained in:
sin
parent
d1a1c42eb3
commit
c0b9a8533f
1
Makefile
1
Makefile
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@ -42,6 +42,7 @@ SRC = \
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cols.c \
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cols.c \
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comm.c \
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comm.c \
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cp.c \
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cp.c \
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csplit.c \
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cut.c \
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cut.c \
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date.c \
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date.c \
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dirname.c \
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dirname.c \
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1
TODO
1
TODO
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@ -6,7 +6,6 @@ such as vi and sh are also not listed here.
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at
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at
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awk
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awk
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bc
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bc
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csplit
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diff
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diff
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ed
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ed
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file
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file
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166
csplit.1
Normal file
166
csplit.1
Normal file
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@ -0,0 +1,166 @@
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.\" $OpenBSD: csplit.1,v 1.11 2014/02/04 13:26:36 jmc Exp $
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.\"
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.\" Copyright (c) 2002 Tim J. Robbins.
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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: src/usr.bin/csplit/csplit.1,v 1.11 2005/01/25 22:29:51 tjr Exp $
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.\"
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.Dd $Mdocdate: February 4 2014 $
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.Dt CSPLIT 1
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.Os
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.Sh NAME
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.Nm csplit
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.Nd split files based on context
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.Sh SYNOPSIS
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.Nm
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.Op Fl ks
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.Op Fl f Ar prefix
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.Op Fl n Ar number
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.Ar file args ...
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.Sh DESCRIPTION
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The
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.Nm
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utility splits
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.Ar file
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into pieces using the patterns
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.Ar args .
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If
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.Ar file
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is
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a dash
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.Pq Sq - ,
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.Nm
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reads from standard input.
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.Pp
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Files are created with a prefix of
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.Dq xx
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and two decimal digits.
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The size of each file is written to standard output
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as it is created.
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If an error occurs whilst files are being created,
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or a
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.Dv HUP ,
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.Dv INT ,
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or
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.Dv TERM
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signal is received,
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all files previously written are removed.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl f Ar prefix
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Create file names beginning with
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.Ar prefix ,
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instead of
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.Dq xx .
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.It Fl k
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Do not remove previously created files if an error occurs or a
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.Dv HUP ,
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.Dv INT ,
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or
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.Dv TERM
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signal is received.
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.It Fl n Ar number
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Create file names beginning with
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.Ar number
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of decimal digits after the prefix,
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instead of 2.
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.It Fl s
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Do not write the size of each output file to standard output as it is
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created.
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.El
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.Pp
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The
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.Ar args
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operands may be a combination of the following patterns:
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.Bl -tag -width indent
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.It Xo
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.Sm off
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.No / Ar regexp No /
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.Op Oo Cm + | - Oc Ar offset
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.Sm on
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.Xc
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Create a file containing the input from the current line to (but not including)
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the next line matching the given basic regular expression.
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An optional
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.Ar offset
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from the line that matched may be specified.
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.It Xo
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.Sm off
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.No % Ar regexp No %
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.Op Oo Cm + | - Oc Ar offset
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.Sm on
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.Xc
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Same as above but a file is not created for the output.
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.It Ar line_no
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Create containing the input from the current line to (but not including)
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the specified line number.
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.It { Ns Ar num Ns }
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Repeat the previous pattern the specified number of times.
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If it follows a line number pattern, a new file will be created for each
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.Ar line_no
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lines,
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.Ar num
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times.
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The first line of the file is line number 1 for historic reasons.
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.El
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.Pp
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After all the patterns have been processed, the remaining input data
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(if there is any) will be written to a new file.
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.Pp
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Requesting to split at a line before the current line number or past the
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end of the file will result in an error.
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.Sh EXIT STATUS
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.Ex -std csplit
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.Sh EXAMPLES
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Split the
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.Xr mdoc 7
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file
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.Pa foo.1
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into one file for each section (up to 21):
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.Pp
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.Dl "$ csplit -k foo.1 '%^\e.Sh%' '/^\e.Sh/' '{20}'"
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.Pp
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Split standard input after the first 99 lines and every 100 lines thereafter:
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.Pp
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.Dl "$ csplit -k - 100 '{19}'"
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.Sh SEE ALSO
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.Xr sed 1 ,
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.Xr split 1 ,
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.Xr re_format 7
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.Sh STANDARDS
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The
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.Nm
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utility is compliant with the
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.St -p1003.1-2008
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specification.
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.Sh HISTORY
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A
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.Nm
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command appeared in PWB
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.Ux .
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.Sh BUGS
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Input lines are limited to
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.Dv LINE_MAX
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(2048) bytes in length.
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452
csplit.c
Normal file
452
csplit.c
Normal file
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@ -0,0 +1,452 @@
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/* $OpenBSD: csplit.c,v 1.5 2014/05/20 01:25:23 guenther Exp $ */
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/* $FreeBSD: src/usr.bin/csplit/csplit.c,v 1.9 2004/03/22 11:15:03 tjr Exp $ */
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/*-
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* Copyright (c) 2002 Tim J. Robbins.
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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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/*
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* csplit -- split files based on context
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*
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* This utility splits its input into numbered output files by line number
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* or by a regular expression. Regular expression matches have an optional
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* offset with them, allowing the split to occur a specified number of
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* lines before or after the match.
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*
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* To handle negative offsets, we stop reading when the match occurs and
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* store the offset that the file should have been split at, then use
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* this output file as input until all the "overflowed" lines have been read.
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* The file is then closed and truncated to the correct length.
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*
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* We assume that the output files can be seeked upon (ie. they cannot be
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* symlinks to named pipes or character devices), but make no such
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* assumption about the input.
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*/
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#include <sys/types.h>
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#include <ctype.h>
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#include <errno.h>
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#include <limits.h>
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#include <locale.h>
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#include <regex.h>
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#include <signal.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "util.h"
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void cleanup(void);
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void do_lineno(const char *);
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void do_rexp(const char *);
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char *get_line(void);
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void handlesig(int);
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FILE *newfile(void);
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void toomuch(FILE *, long);
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void usage(void);
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/*
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* Command line options
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*/
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const char *prefix; /* File name prefix */
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long sufflen; /* Number of decimal digits for suffix */
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int sflag; /* Suppress output of file names */
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int kflag; /* Keep output if error occurs */
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/*
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* Other miscellaneous globals (XXX too many)
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*/
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long lineno; /* Current line number in input file */
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long reps; /* Number of repetitions for this pattern */
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long nfiles; /* Number of files output so far */
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long maxfiles; /* Maximum number of files we can create */
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char currfile[PATH_MAX]; /* Current output file */
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const char *infn; /* Name of the input file */
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FILE *infile; /* Input file handle */
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FILE *overfile; /* Overflow file for toomuch() */
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off_t truncofs; /* Offset this file should be truncated at */
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int doclean; /* Should cleanup() remove output? */
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int
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main(int argc, char *argv[])
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{
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struct sigaction sa;
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long i;
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const char *expr;
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char *ep, *p;
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FILE *ofp;
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kflag = sflag = 0;
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prefix = "xx";
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sufflen = 2;
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ARGBEGIN {
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case 'f':
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prefix = EARGF(usage());
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|
break;
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case 'k':
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kflag = 1;
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|
break;
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case 'n':
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sufflen = estrtol(EARGF(usage()), 10);
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break;
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case 's':
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sflag = 1;
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break;
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default:
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usage();
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} ARGEND;
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if (sufflen + strlen(prefix) >= PATH_MAX)
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eprintf("name too long\n");
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if ((infn = *argv++) == NULL)
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usage();
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|
if (strcmp(infn, "-") == 0) {
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|
infile = stdin;
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|
infn = "stdin";
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|
} else if ((infile = fopen(infn, "r")) == NULL)
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eprintf("fopen %s:", infn);
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|
if (!kflag) {
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doclean = 1;
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atexit(cleanup);
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sa.sa_flags = 0;
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sa.sa_handler = handlesig;
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sigemptyset(&sa.sa_mask);
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|
sigaddset(&sa.sa_mask, SIGHUP);
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||||||
|
sigaddset(&sa.sa_mask, SIGINT);
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|
sigaddset(&sa.sa_mask, SIGTERM);
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|
sigaction(SIGHUP, &sa, NULL);
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|
sigaction(SIGINT, &sa, NULL);
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|
sigaction(SIGTERM, &sa, NULL);
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|
}
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|
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lineno = 0;
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nfiles = 0;
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truncofs = 0;
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overfile = NULL;
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/* Ensure 10^sufflen < LONG_MAX. */
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for (maxfiles = 1, i = 0; i < sufflen; i++) {
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if (maxfiles > LONG_MAX / 10)
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eprintf("%ld: suffix too long (limit %ld)\n",
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sufflen, i);
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maxfiles *= 10;
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}
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/* Create files based on supplied patterns. */
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while (nfiles < maxfiles - 1 && (expr = *argv++) != NULL) {
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/* Look ahead & see if this pattern has any repetitions. */
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||||||
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if (*argv != NULL && **argv == '{') {
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errno = 0;
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reps = strtol(*argv + 1, &ep, 10);
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if (reps < 0 || *ep != '}' || errno != 0)
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eprintf("%s: bad repetition count\n", *argv + 1);
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argv++;
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} else
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reps = 0;
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if (*expr == '/' || *expr == '%') {
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do {
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do_rexp(expr);
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} while (reps-- != 0 && nfiles < maxfiles - 1);
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} else if (isdigit((unsigned char)*expr))
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do_lineno(expr);
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else
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eprintf("%s: unrecognised pattern\n", expr);
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}
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/* Copy the rest into a new file. */
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if (!feof(infile)) {
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ofp = newfile();
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while ((p = get_line()) != NULL && fputs(p, ofp) == 0)
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;
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if (!sflag)
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printf("%jd\n", (intmax_t)ftello(ofp));
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if (fclose(ofp) != 0)
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eprintf("fclose %s:", currfile);
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}
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toomuch(NULL, 0);
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doclean = 0;
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return (0);
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}
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||||||
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void
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|
usage(void)
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|
{
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||||||
|
eprintf("usage: %s [-ks] [-f prefix] [-n number] file args ...\n", argv0);
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}
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/* ARGSUSED */
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void
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handlesig(int sig)
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||||||
|
{
|
||||||
|
const char msg[] = "csplit: caught signal, cleaning up\n";
|
||||||
|
|
||||||
|
write(STDERR_FILENO, msg, sizeof(msg) - 1);
|
||||||
|
cleanup();
|
||||||
|
_exit(2);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Create a new output file. */
|
||||||
|
FILE *
|
||||||
|
newfile(void)
|
||||||
|
{
|
||||||
|
FILE *fp;
|
||||||
|
|
||||||
|
if ((size_t)snprintf(currfile, sizeof(currfile), "%s%0*ld", prefix,
|
||||||
|
(int)sufflen, nfiles) >= sizeof(currfile))
|
||||||
|
eprintf("%s: name too long\n", currfile);
|
||||||
|
if ((fp = fopen(currfile, "w+")) == NULL)
|
||||||
|
eprintf("fopen %s:", currfile);
|
||||||
|
nfiles++;
|
||||||
|
|
||||||
|
return (fp);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Remove partial output, called before exiting. */
|
||||||
|
void
|
||||||
|
cleanup(void)
|
||||||
|
{
|
||||||
|
char fnbuf[PATH_MAX];
|
||||||
|
long i;
|
||||||
|
|
||||||
|
if (!doclean)
|
||||||
|
return;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* NOTE: One cannot portably assume to be able to call snprintf() from
|
||||||
|
* inside a signal handler. It is, however, safe to do on OpenBSD.
|
||||||
|
*/
|
||||||
|
for (i = 0; i < nfiles; i++) {
|
||||||
|
snprintf(fnbuf, sizeof(fnbuf), "%s%0*ld", prefix,
|
||||||
|
(int)sufflen, i);
|
||||||
|
unlink(fnbuf);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Read a line from the input into a static buffer. */
|
||||||
|
char *
|
||||||
|
get_line(void)
|
||||||
|
{
|
||||||
|
static char lbuf[LINE_MAX];
|
||||||
|
FILE *src;
|
||||||
|
|
||||||
|
src = overfile != NULL ? overfile : infile;
|
||||||
|
|
||||||
|
again: if (fgets(lbuf, sizeof(lbuf), src) == NULL) {
|
||||||
|
if (src == overfile) {
|
||||||
|
src = infile;
|
||||||
|
goto again;
|
||||||
|
}
|
||||||
|
return (NULL);
|
||||||
|
}
|
||||||
|
if (ferror(src))
|
||||||
|
eprintf("%s: read error:", infn);
|
||||||
|
lineno++;
|
||||||
|
|
||||||
|
return (lbuf);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Conceptually rewind the input (as obtained by get_line()) back `n' lines. */
|
||||||
|
void
|
||||||
|
toomuch(FILE *ofp, long n)
|
||||||
|
{
|
||||||
|
char buf[BUFSIZ];
|
||||||
|
size_t i, nread;
|
||||||
|
|
||||||
|
if (overfile != NULL) {
|
||||||
|
/*
|
||||||
|
* Truncate the previous file we overflowed into back to
|
||||||
|
* the correct length, close it.
|
||||||
|
*/
|
||||||
|
if (fflush(overfile) != 0)
|
||||||
|
eprintf("overflow\n");
|
||||||
|
if (ftruncate(fileno(overfile), truncofs) != 0)
|
||||||
|
eprintf("overflow\n");
|
||||||
|
if (fclose(overfile) != 0)
|
||||||
|
eprintf("overflow\n");
|
||||||
|
overfile = NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (n == 0)
|
||||||
|
/* Just tidying up */
|
||||||
|
return;
|
||||||
|
|
||||||
|
lineno -= n;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Wind the overflow file backwards to `n' lines before the
|
||||||
|
* current one.
|
||||||
|
*/
|
||||||
|
do {
|
||||||
|
if (ftello(ofp) < (off_t)sizeof(buf))
|
||||||
|
rewind(ofp);
|
||||||
|
else
|
||||||
|
fseeko(ofp, -(off_t)sizeof(buf), SEEK_CUR);
|
||||||
|
if (ferror(ofp))
|
||||||
|
eprintf("%s: can't seek:", currfile);
|
||||||
|
if ((nread = fread(buf, 1, sizeof(buf), ofp)) == 0)
|
||||||
|
eprintf("can't read overflowed output\n");
|
||||||
|
if (fseeko(ofp, -(off_t)nread, SEEK_CUR) != 0)
|
||||||
|
eprintf("fseeko %s:", currfile);
|
||||||
|
for (i = 1; i <= nread; i++)
|
||||||
|
if (buf[nread - i] == '\n' && n-- == 0)
|
||||||
|
break;
|
||||||
|
if (ftello(ofp) == 0)
|
||||||
|
break;
|
||||||
|
} while (n > 0);
|
||||||
|
if (fseeko(ofp, (off_t)(nread - i + 1), SEEK_CUR) != 0)
|
||||||
|
eprintf("fseeko %s:", currfile);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* get_line() will read from here. Next call will truncate to
|
||||||
|
* truncofs in this file.
|
||||||
|
*/
|
||||||
|
overfile = ofp;
|
||||||
|
truncofs = ftello(overfile);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Handle splits for /regexp/ and %regexp% patterns. */
|
||||||
|
void
|
||||||
|
do_rexp(const char *expr)
|
||||||
|
{
|
||||||
|
regex_t cre;
|
||||||
|
intmax_t nwritten;
|
||||||
|
long ofs;
|
||||||
|
int first;
|
||||||
|
char *ecopy, *ep, *p, *pofs, *re;
|
||||||
|
FILE *ofp;
|
||||||
|
|
||||||
|
if ((ecopy = strdup(expr)) == NULL)
|
||||||
|
eprintf("strdup:");
|
||||||
|
|
||||||
|
re = ecopy + 1;
|
||||||
|
if ((pofs = strrchr(ecopy, *expr)) == NULL || pofs[-1] == '\\')
|
||||||
|
eprintf("%s: missing trailing %c\n", expr, *expr);
|
||||||
|
*pofs++ = '\0';
|
||||||
|
|
||||||
|
if (*pofs != '\0') {
|
||||||
|
errno = 0;
|
||||||
|
ofs = strtol(pofs, &ep, 10);
|
||||||
|
if (*ep != '\0' || errno != 0)
|
||||||
|
eprintf("%s: bad offset\n", pofs);
|
||||||
|
} else
|
||||||
|
ofs = 0;
|
||||||
|
|
||||||
|
if (regcomp(&cre, re, REG_NOSUB) != 0)
|
||||||
|
eprintf("%s: bad regular expression'n", re);
|
||||||
|
|
||||||
|
if (*expr == '/')
|
||||||
|
/* /regexp/: Save results to a file. */
|
||||||
|
ofp = newfile();
|
||||||
|
else {
|
||||||
|
/* %regexp%: Make a temporary file for overflow. */
|
||||||
|
if ((ofp = tmpfile()) == NULL)
|
||||||
|
eprintf("tmpfile:");
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Read and output lines until we get a match. */
|
||||||
|
first = 1;
|
||||||
|
while ((p = get_line()) != NULL) {
|
||||||
|
if (fputs(p, ofp) != 0)
|
||||||
|
break;
|
||||||
|
if (!first && regexec(&cre, p, 0, NULL, 0) == 0)
|
||||||
|
break;
|
||||||
|
first = 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (p == NULL)
|
||||||
|
eprintf("%s: no match\n", re);
|
||||||
|
|
||||||
|
if (ofs <= 0) {
|
||||||
|
/*
|
||||||
|
* Negative (or zero) offset: throw back any lines we should
|
||||||
|
* not have read yet.
|
||||||
|
*/
|
||||||
|
if (p != NULL) {
|
||||||
|
toomuch(ofp, -ofs + 1);
|
||||||
|
nwritten = (intmax_t)truncofs;
|
||||||
|
} else
|
||||||
|
nwritten = (intmax_t)ftello(ofp);
|
||||||
|
} else {
|
||||||
|
/*
|
||||||
|
* Positive offset: copy the requested number of lines
|
||||||
|
* after the match.
|
||||||
|
*/
|
||||||
|
while (--ofs > 0 && (p = get_line()) != NULL)
|
||||||
|
fputs(p, ofp);
|
||||||
|
toomuch(NULL, 0);
|
||||||
|
nwritten = (intmax_t)ftello(ofp);
|
||||||
|
if (fclose(ofp) != 0)
|
||||||
|
eprintf("fclose %s:", currfile);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (!sflag && *expr == '/')
|
||||||
|
printf("%jd\n", nwritten);
|
||||||
|
|
||||||
|
regfree(&cre);
|
||||||
|
free(ecopy);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Handle splits based on line number. */
|
||||||
|
void
|
||||||
|
do_lineno(const char *expr)
|
||||||
|
{
|
||||||
|
long lastline, tgtline;
|
||||||
|
char *ep, *p;
|
||||||
|
FILE *ofp;
|
||||||
|
|
||||||
|
errno = 0;
|
||||||
|
tgtline = strtol(expr, &ep, 10);
|
||||||
|
if (tgtline <= 0 || errno != 0 || *ep != '\0')
|
||||||
|
eprintf("%s: bad line number\n", expr);
|
||||||
|
lastline = tgtline;
|
||||||
|
if (lastline <= lineno)
|
||||||
|
eprintf("%s: can't go backwards\n", expr);
|
||||||
|
|
||||||
|
while (nfiles < maxfiles - 1) {
|
||||||
|
ofp = newfile();
|
||||||
|
while (lineno + 1 != lastline) {
|
||||||
|
if ((p = get_line()) == NULL)
|
||||||
|
eprintf("%ld: out of range\n", lastline);
|
||||||
|
if (fputs(p, ofp) != 0)
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
if (!sflag)
|
||||||
|
printf("%jd\n", (intmax_t)ftello(ofp));
|
||||||
|
if (fclose(ofp) != 0)
|
||||||
|
eprintf("fclose %s:", currfile);
|
||||||
|
if (reps-- == 0)
|
||||||
|
break;
|
||||||
|
lastline += tgtline;
|
||||||
|
}
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue
Block a user