usr.bin/gzip/zgrep

   1 #!/bin/sh
   2 #
   3 # $NetBSD: zgrep,v 1.3 2004/04/27 09:18:16 jdolecek 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 # 3. The name of the author may not be used to endorse or promote products
  17 #    derived from this software without specific prior written permission.
  18 #
  19 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21 # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22 # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  24 # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  28 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29
  30 grep=/usr/bin/grep
  31 zcat=/usr/bin/zcat
  32
  33 endofopts=0
  34 pattern_found=0
  35 grep_args=""
  36
  37 prg=$0
  38
  39 # handle being called 'zegrep' or 'zfgrep'
  40 case ${prg} in
  41     *zegrep)
  42         grep_args="-E";;
  43     *zfgrep)
  44         grep_args="-F";;
  45 esac
  46
  47 # skip all options and pass them on to grep taking care of options
  48 # with arguments, and if -e was supplied
  49
  50 while [ $# -gt 0 -a ${endofopts} -eq 0 ]
  51 do
  52     case $1 in
  53     # from GNU grep-2.5.1 -- keep in sync!
  54         -[ABCDXdefm])
  55             case $1 in
  56                 -e)
  57                     pattern_found=1;;
  58                 *)
  59                     ;;
  60             esac
  61
  62             if [ $# -lt 2 ]
  63                 then
  64                 echo "${prg}: missing argument for ${saved_arg} flag" >&2
  65                 exit 1
  66             fi
  67             grep_args="${grep_args} $1 $2"
  68             shift 2
  69             ;;
  70         --)
  71             grep_args="${grep_args} $1"
  72             shift
  73             endofopts=1
  74             ;;
  75         -)
  76             endofopts=1
  77             ;;
  78         -*)
  79             grep_args="${grep_args} $1"
  80             shift
  81             ;;
  82         *)
  83             # pattern to grep for
  84             endofopts=1
  85             ;;
  86     esac
  87 done
  88
  89 # if no -e option was found, take next argument as grep-pattern
  90 if [ ${pattern_found} -lt 1 ]
  91 then
  92     if [ $# -lt 1 ]
  93     then
  94         echo "${prg}: missing pattern" >&2
  95         exit 1
  96     fi
  97     pattern=$1
  98     shift
  99 fi
 100
 101 # call grep ...
 102 if [ $# -lt 1 ]
 103 then
 104     # ... on stdin
 105     ${zcat} -fq - | ${grep} ${grep_args} "${pattern}" -
 106 else
 107     # ... on all files given on the command line
 108     while [ $# -gt 0 ]
 109     do
 110         ${zcat} -fq -- "$1" | ${grep} -H --label="${1}" "${pattern}" ${grep_args} -
 111         shift
 112     done
 113 fi
 114
 115 exit 0