xref: /dragonfly/usr.bin/gzip/zgrep (revision 36a3d1d6) 
1#!/bin/sh
2#
3# $NetBSD: zgrep,v 1.7 2008/05/08 15:35:23 wiz Exp $
4# $DragonFly: src/usr.bin/gzip/zgrep,v 1.1 2004/10/26 11:19:31 joerg Exp $
5#
6# Copyright (c) 2003 Thomas Klausner.
7#
8# Redistribution and use in source and binary forms, with or without
9# modification, are permitted provided that the following conditions
10# are met:
11# 1. Redistributions of source code must retain the above copyright
12#    notice, this list of conditions and the following disclaimer.
13# 2. Redistributions in binary form must reproduce the above copyright
14#    notice, this list of conditions and the following disclaimer in the
15#    documentation and/or other materials provided with the distribution.
16#
17# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28grep=/usr/bin/grep
29zcat=/usr/bin/zcat
30
31endofopts=0
32pattern_found=0
33grep_args=""
34hyphen=0
35silent=0
36
37prg=$0
38
39# handle being called 'zegrep' or 'zfgrep'
40case ${prg} in
41    *zegrep)
42	grep_args="-E";;
43    *zfgrep)
44	grep_args="-F";;
45esac
46
47# skip all options and pass them on to grep taking care of options
48# with arguments, and if -e was supplied
49
50while [ $# -gt 0 -a ${endofopts} -eq 0 ]
51do
52    case $1 in
53    # from GNU grep-2.5.1 -- keep in sync!
54	-[ABCDXdefm])
55	    if [ $# -lt 2 ]
56		then
57		echo "${prg}: missing argument for $1 flag" >&2
58		exit 1
59	    fi
60	    case $1 in
61		-e)
62		    pattern="$2"
63		    pattern_found=1
64		    shift 2
65		    break
66		    ;;
67		*)
68		    ;;
69	    esac
70	    grep_args="${grep_args} $1 $2"
71	    shift 2
72	    ;;
73	--)
74	    shift
75	    endofopts=1
76	    ;;
77	-)
78	    hyphen=1
79	    shift
80	    ;;
81	-h)
82	    silent=1
83	    shift
84	    ;;
85	-*)
86	    grep_args="${grep_args} $1"
87	    shift
88	    ;;
89	*)
90	    # pattern to grep for
91	    endofopts=1
92	    ;;
93    esac
94done
95
96# if no -e option was found, take next argument as grep-pattern
97if [ ${pattern_found} -lt 1 ]
98then
99    if [ $# -ge 1 ]; then
100	pattern="$1"
101	shift
102    elif [ ${hyphen} -gt 0 ]; then
103	pattern="-"
104    else
105	echo "${prg}: missing pattern" >&2
106	exit 1
107    fi
108fi
109
110# call grep ...
111if [ $# -lt 1 ]
112then
113    # ... on stdin
114    ${zcat} -fq - | ${grep} ${grep_args} -- "${pattern}" -
115else
116    # ... on all files given on the command line
117    if [ ${silent} -lt 1 ]; then
118	grep_args="-H ${grep_args}"
119    fi
120    while [ $# -gt 0 ]
121    do
122	${zcat} -fq -- "$1" | ${grep} --label="${1}" ${grep_args} -- "${pattern}" -
123	shift
124    done
125fi
126
127exit 0
128