zgrep.in

   1 #!/bin/sh
   2
   3 # zgrep -- a wrapper around a grep program that decompresses files as needed
   4 # Adapted from a version sent by Charles Levert <charles@comm.polymtl.ca>
   5
   6 # Copyright (C) 1998, 2001, 2002, 2006, 2007 Free Software Foundation
   7 # Copyright (C) 1993 Jean-loup Gailly
   8
   9 # This program is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; either version 3 of the License, or
  12 # (at your option) any later version.
  13
  14 # This program is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 # GNU General Public License for more details.
  18
  19 # You should have received a copy of the GNU General Public License along
  20 # with this program; if not, write to the Free Software Foundation, Inc.,
  21 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  22
  23 bindir=@bindir@
  24 case $1 in
  25 --__bindir) bindir=${2?}; shift; shift;;
  26 esac
  27 PATH=$bindir:$PATH
  28
  29 grep='${GREP-grep}'
  30
  31 version='zgrep (gzip) @VERSION@
  32 Copyright (C) 2007, 2009 Free Software Foundation, Inc.
  33 This is free software.  You may redistribute copies of it under the terms of
  34 the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
  35 There is NO WARRANTY, to the extent permitted by law.
  36
  37 Written by Jean-loup Gailly.'
  38
  39 usage="Usage: $0 [OPTION]... [-e] PATTERN [FILE]...
  40 Look for instances of PATTERN in the input FILEs, using their
  41 uncompressed contents if they are compressed.
  42
  43 OPTIONs are the same as for 'grep'.
  44
  45 Report bugs to <bug-gzip@gnu.org>."
  46
  47 # sed script to escape all ' for the shell, and then (to handle trailing
  48 # newlines correctly) turn trailing X on last line into '.
  49 escape='
  50   s/'\''/'\''\\'\'''\''/g
  51   $s/X$/'\''/
  52 '
  53 operands=
  54 have_pat=0
  55 files_with_matches=0
  56 files_without_matches=0
  57 no_filename=0
  58 with_filename=0
  59
  60 while test $# -ne 0; do
  61   option=$1
  62   shift
  63   optarg=
  64
  65   case $option in
  66   (-[0123456789abcdhHiIKLlnoqrRsTuUvVwxyzZ]?*)
  67     arg2=-\'$(expr "X${option}X" : 'X-.[0-9]*\(.*\)' | sed "$escape")
  68     eval "set -- $arg2 "'${1+"$@"}'
  69     option=$(expr "X$option" : 'X\(-.[0-9]*\)');;
  70   (--binary-*=* | --[lm]a*=* | --reg*=*)
  71     ;;
  72   (-[ABCDefm] | --binary-* | --file | --[lm]a* | --reg*)
  73     case ${1?"$option option requires an argument"} in
  74     (*\'*)
  75       optarg=" '"$(printf '%sX\n' "$1" | sed "$escape");;
  76     (*)
  77       optarg=" '$1'";;
  78     esac
  79     shift;;
  80   (--)
  81     break;;
  82   (-?*)
  83     ;;
  84   (*)
  85     case $option in
  86     (*\'*)
  87       operands="$operands '"$(printf '%sX\n' "$option" | sed "$escape");;
  88     (*)
  89       operands="$operands '$option'";;
  90     esac
  91     ${POSIXLY_CORRECT+break}
  92     continue;;
  93   esac
  94
  95   case $option in
  96   (-[drRzZ] | --di* | --exc* | --inc* | --rec* | --nu*)
  97     printf >&2 '%s: %s: option not supported\n' "$0" "$option"
  98     exit 2;;
  99   (-[ef]* | --file | --file=* | --reg*)
 100     have_pat=1;;
 101   (--h | --he | --hel | --help)
 102     echo "$usage" || exit 2
 103     exit;;
 104   (-H | --wi | --wit | --with | --with- | --with-f | --with-fi \
 105   | --with-fil | --with-file | --with-filen | --with-filena | --with-filenam \
 106   | --with-filename)
 107     with_filename=1
 108     continue;;
 109   (-l | --files-with-*)
 110     files_with_matches=1;;
 111   (-L | --files-witho*)
 112     files_without_matches=1;;
 113   (--no-f*)
 114     no_filename=1;;
 115   (-V | --v | --ve | --ver | --vers | --versi | --versio | --version)
 116     echo "$version" || exit 2
 117     exit;;
 118   esac
 119
 120   case $option in
 121   (*\'?*)
 122     option=\'$(expr "X${option}X" : 'X\(.*\)' | sed "$escape");;
 123   (*)
 124     option="'$option'";;
 125   esac
 126
 127   grep="$grep $option$optarg"
 128 done
 129
 130 eval "set -- $operands "'${1+"$@"}'
 131
 132 if test $have_pat -eq 0; then
 133   case ${1?"missing pattern; try \`$0 --help' for help"} in
 134   (*\'*)
 135     grep="$grep -- '"$(printf '%sX\n' "$1" | sed "$escape");;
 136   (*)
 137     grep="$grep -- '$1'";;
 138   esac
 139   shift
 140 fi
 141
 142 if test $# -eq 0; then
 143   set -- -
 144 fi
 145
 146 exec 3>&1
 147 res=0
 148
 149 for i
 150 do
 151   # Fail if gzip or grep (or sed) fails.
 152   gzip_status=$(
 153     exec 5>&1
 154     (gzip -cdfq -- "$i" 5>&-; echo $? >&5) 3>&- |
 155     if test $files_with_matches -eq 1; then
 156       eval "$grep" >/dev/null && { printf '%s\n' "$i" || exit 2; }
 157     elif test $files_without_matches -eq 1; then
 158       eval "$grep" >/dev/null || {
 159         r=$?
 160         if test $r -eq 1; then
 161           printf '%s\n' "$i" || r=2
 162         fi
 163         exit $r
 164       }
 165     elif test $with_filename -eq 0 &&
 166          { test $# -eq 1 || test $no_filename -eq 1; }; then
 167       eval "$grep"
 168     else
 169       case $i in
 170       (*'
 171 '* | *'&'* | *'\'* | *'|'*)
 172         i=$(printf '%s\n' "$i" |
 173             sed '
 174               $!N
 175               $s/[&\|]/\\&/g
 176               $s/\n/\\n/g
 177             ');;
 178       esac
 179       sed_script="s|^|$i:|"
 180
 181       # Fail if grep or sed fails.
 182       r=$(
 183         exec 4>&1
 184         (eval "$grep" 4>&-; echo $? >&4) 3>&- | sed "$sed_script" >&3 4>&-
 185       ) || r=2
 186       exit $r
 187     fi >&3 5>&-
 188   )
 189   r=$?
 190   test "$gzip_status" -eq 0 || test "$gzip_status" -eq 2 || r=2
 191   test $res -lt $r && res=$r
 192 done
 193 exit $res