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, 2009, 2010 Free Software
   7 # Foundation
   8
   9 # Copyright (C) 1993 Jean-loup Gailly
  10
  11 # This program is free software; you can redistribute it and/or modify
  12 # it under the terms of the GNU General Public License as published by
  13 # the Free Software Foundation; either version 3 of the License, or
  14 # (at your option) any later version.
  15
  16 # This program is distributed in the hope that it will be useful,
  17 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 # GNU General Public License for more details.
  20
  21 # You should have received a copy of the GNU General Public License along
  22 # with this program; if not, write to the Free Software Foundation, Inc.,
  23 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24
  25 bindir=@bindir@
  26 case $1 in
  27 --__bindir) bindir=${2?}; shift; shift;;
  28 esac
  29 PATH=$bindir:$PATH
  30
  31 grep='${GREP-grep}'
  32
  33 version='zgrep (gzip) @VERSION@
  34 Copyright (C) 2010-2011 Free Software Foundation, Inc.
  35 This is free software.  You may redistribute copies of it under the terms of
  36 the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
  37 There is NO WARRANTY, to the extent permitted by law.
  38
  39 Written by Jean-loup Gailly.'
  40
  41 usage="Usage: $0 [OPTION]... [-e] PATTERN [FILE]...
  42 Look for instances of PATTERN in the input FILEs, using their
  43 uncompressed contents if they are compressed.
  44
  45 OPTIONs are the same as for 'grep'.
  46
  47 Report bugs to <bug-gzip@gnu.org>."
  48
  49 # sed script to escape all ' for the shell, and then (to handle trailing
  50 # newlines correctly) append ' to the last line.
  51 escape='
  52   s/'\''/'\''\\'\'''\''/g
  53   $s/$/'\''/
  54 '
  55 operands=
  56 have_pat=0
  57 files_with_matches=0
  58 files_without_matches=0
  59 no_filename=0
  60 with_filename=0
  61
  62 while test $# -ne 0; do
  63   option=$1
  64   shift
  65   optarg=
  66
  67   case $option in
  68   (-[0123456789EFGHIKLPRTUVZabchilnoqrsuvwxyz]?*)
  69     arg2=-\'$(expr "X$option" : 'X-.[0-9]*\(.*\)' | sed "$escape")
  70     eval "set -- $arg2 "'${1+"$@"}'
  71     option=$(expr "X$option" : 'X\(-.[0-9]*\)');;
  72   (--binary-*=* | --[lm]a*=* | --reg*=*)
  73     ;;
  74   (-[ABCDXdefm] | binary-* | --file | --[lm]a* | --reg*)
  75     case ${1?"$option option requires an argument"} in
  76     (*\'*)
  77       optarg=" '"$(printf '%s\n' "$1" | sed "$escape");;
  78     (*)
  79       optarg=" '$1'";;
  80     esac
  81     shift;;
  82   (-f?*\'*)
  83     optarg=" '"$(expr "X$option" : 'X-f\(.*\)' | sed "$escape")
  84     option=-f;;
  85   (-f?*)
  86     optarg=" '"$(expr "X$option" : 'X-f\(.*\)')\'
  87     option=-f;;
  88   (--file=*\'*)
  89     optarg=" '"$(expr "X$option" : 'X--file=\(.*\)' | sed "$escape")
  90     option=--file;;
  91   (--file=*)
  92     optarg=" '"$(expr "X$option" : 'X--file=\(.*\)')\'
  93     option=--file;;
  94   (--)
  95     break;;
  96   (-?*)
  97     ;;
  98   (*)
  99     case $option in
 100     (*\'*)
 101       operands="$operands '"$(printf '%s\n' "$option" | sed "$escape");;
 102     (*)
 103       operands="$operands '$option'";;
 104     esac
 105     ${POSIXLY_CORRECT+break}
 106     continue;;
 107   esac
 108
 109   case $option in
 110   (-[drRzZ] | --di* | --exc* | --inc* | --rec* | --nu*)
 111     printf >&2 '%s: %s: option not supported\n' "$0" "$option"
 112     exit 2;;
 113   (-e* | --reg*)
 114     have_pat=1;;
 115   (-f | --file)
 116     # The pattern is coming from a file rather than the command-line.
 117     # If the file is actually stdin then we need to do a little
 118     # magic, since we use stdin to pass the gzip output to grep.
 119     # Turn the -f option into an -e option by copying the file's
 120     # contents into OPTARG.
 121     case $optarg in
 122     (" '-'" | " '/dev/stdin'" | " '/dev/fd/0'")
 123       option=-e
 124       optarg=" '"$(sed "$escape") || exit 2;;
 125     esac
 126     have_pat=1;;
 127   (--h | --he | --hel | --help)
 128     echo "$usage" || exit 2
 129     exit;;
 130   (-H | --wi | --wit | --with | --with- | --with-f | --with-fi \
 131   | --with-fil | --with-file | --with-filen | --with-filena | --with-filenam \
 132   | --with-filename)
 133     with_filename=1
 134     continue;;
 135   (-l | --files-with-*)
 136     files_with_matches=1;;
 137   (-L | --files-witho*)
 138     files_without_matches=1;;
 139   (-h | --no-f*)
 140     no_filename=1;;
 141   (-V | --v | --ve | --ver | --vers | --versi | --versio | --version)
 142     echo "$version" || exit 2
 143     exit;;
 144   esac
 145
 146   case $option in
 147   (*\'?*)
 148     option=\'$(printf '%s\n' "$option" | sed "$escape");;
 149   (*)
 150     option="'$option'";;
 151   esac
 152
 153   grep="$grep $option$optarg"
 154 done
 155
 156 eval "set -- $operands "'${1+"$@"}'
 157
 158 if test $have_pat -eq 0; then
 159   case ${1?"missing pattern; try \`$0 --help' for help"} in
 160   (*\'*)
 161     grep="$grep -- '"$(printf '%s\n' "$1" | sed "$escape");;
 162   (*)
 163     grep="$grep -- '$1'";;
 164   esac
 165   shift
 166 fi
 167
 168 if test $# -eq 0; then
 169   set -- -
 170 fi
 171
 172 exec 3>&1
 173 res=0
 174
 175 for i
 176 do
 177   # Fail if gzip or grep (or sed) fails.
 178   gzip_status=$(
 179     exec 5>&1
 180     (gzip -cdfq -- "$i" 5>&-; echo $? >&5) 3>&- |
 181     if test $files_with_matches -eq 1; then
 182       eval "$grep" >/dev/null && { printf '%s\n' "$i" || exit 2; }
 183     elif test $files_without_matches -eq 1; then
 184       eval "$grep" >/dev/null || {
 185         r=$?
 186         if test $r -eq 1; then
 187           printf '%s\n' "$i" || r=2
 188         fi
 189         exit $r
 190       }
 191     elif test $with_filename -eq 0 &&
 192          { test $# -eq 1 || test $no_filename -eq 1; }; then
 193       eval "$grep"
 194     else
 195       case $i in
 196       (*'
 197 '* | *'&'* | *'\'* | *'|'*)
 198         i=$(printf '%s\n' "$i" |
 199             sed '
 200               $!N
 201               $s/[&\|]/\\&/g
 202               $s/\n/\\n/g
 203             ');;
 204       esac
 205       sed_script="s|^|$i:|"
 206
 207       # Fail if grep or sed fails.
 208       r=$(
 209         exec 4>&1
 210         (eval "$grep" 4>&-; echo $? >&4) 3>&- | sed "$sed_script" >&3 4>&-
 211       ) && exit $r
 212       r=$?
 213       test 1 -lt $r && exit $r || exit 2
 214     fi >&3 5>&-
 215   )
 216   r=$?
 217   test 128 -lt $r && exit $r
 218   test "$gzip_status" -eq 0 || test "$gzip_status" -eq 2 || r=2
 219   test $res -lt $r && res=$r
 220 done
 221 exit $res