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, 2009-2015 Free Software
   7 # Foundation, Inc.
   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) 2010-2015 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', except that the following 'grep'
  46 options are not supported: --dereference-recursive (-R), --directories (-d),
  47 --exclude, --exclude-from, --exclude-dir, --include, --null (-Z),
  48 --null-data (-z), and --recursive (-r).
  49
  50 Report bugs to <bug-gzip@gnu.org>."
  51
  52 # sed script to escape all ' for the shell, and then (to handle trailing
  53 # newlines correctly) append ' to the last line.
  54 escape='
  55   s/'\''/'\''\\'\'''\''/g
  56   $s/$/'\''/
  57 '
  58 operands=
  59 have_pat=0
  60 files_with_matches=0
  61 files_without_matches=0
  62 no_filename=0
  63 with_filename=0
  64
  65 while test $# -ne 0; do
  66   option=$1
  67   shift
  68   optarg=
  69
  70   case $option in
  71   (-[0123456789EFGHIKLPRTUVZabchilnoqrsuvwxyz]*[!0123456789]*)
  72     arg2=-\'$(expr "X$option" : 'X-.[0-9]*\(.*\)' | sed "$escape")
  73     eval "set -- $arg2 "'${1+"$@"}'
  74     option=$(expr "X$option" : 'X\(-.[0-9]*\)');;
  75   (--binary-*=* | --[lm]a*=* | --reg*=*)
  76     ;;
  77   (-[ABCDXdefm] | binary-* | --file | --[lm]a* | --reg*)
  78     case ${1?"$option option requires an argument"} in
  79     (*\'*)
  80       optarg=" '"$(printf '%s\n' "$1" | sed "$escape");;
  81     (*)
  82       optarg=" '$1'";;
  83     esac
  84     shift;;
  85   (-f?*\'*)
  86     optarg=" '"$(expr "X$option" : 'X-f\(.*\)' | sed "$escape")
  87     option=-f;;
  88   (-f?*)
  89     optarg=" '"$(expr "X$option" : 'X-f\(.*\)')\'
  90     option=-f;;
  91   (--file=*\'*)
  92     optarg=" '"$(expr "X$option" : 'X--file=\(.*\)' | sed "$escape")
  93     option=--file;;
  94   (--file=*)
  95     optarg=" '"$(expr "X$option" : 'X--file=\(.*\)')\'
  96     option=--file;;
  97   (--)
  98     break;;
  99   (-?*)
 100     ;;
 101   (*)
 102     case $option in
 103     (*\'*)
 104       operands="$operands '"$(printf '%s\n' "$option" | sed "$escape");;
 105     (*)
 106       operands="$operands '$option'";;
 107     esac
 108     ${POSIXLY_CORRECT+break}
 109     continue;;
 110   esac
 111
 112   case $option in
 113   (-[drRzZ] | --di* | --exc* | --inc* | --rec* | --nu*)
 114     printf >&2 '%s: %s: option not supported\n' "$0" "$option"
 115     exit 2;;
 116   (-e* | --reg*)
 117     have_pat=1;;
 118   (-f | --file)
 119     # The pattern is coming from a file rather than the command-line.
 120     # If the file is actually stdin then we need to do a little
 121     # magic, since we use stdin to pass the gzip output to grep.
 122     # Turn the -f option into an -e option by copying the file's
 123     # contents into OPTARG.
 124     case $optarg in
 125     (" '-'" | " '/dev/stdin'" | " '/dev/fd/0'")
 126       option=-e
 127       optarg=" '"$(sed "$escape") || exit 2;;
 128     esac
 129     have_pat=1;;
 130   (--h | --he | --hel | --help)
 131     echo "$usage" || exit 2
 132     exit;;
 133   (-H | --wi | --wit | --with | --with- | --with-f | --with-fi \
 134   | --with-fil | --with-file | --with-filen | --with-filena | --with-filenam \
 135   | --with-filename)
 136     with_filename=1
 137     continue;;
 138   (-l | --files-with-*)
 139     files_with_matches=1;;
 140   (-L | --files-witho*)
 141     files_without_matches=1;;
 142   (-h | --no-f*)
 143     no_filename=1;;
 144   (-V | --v | --ve | --ver | --vers | --versi | --versio | --version)
 145     echo "$version" || exit 2
 146     exit;;
 147   esac
 148
 149   case $option in
 150   (*\'?*)
 151     option=\'$(printf '%s\n' "$option" | sed "$escape");;
 152   (*)
 153     option="'$option'";;
 154   esac
 155
 156   grep="$grep $option$optarg"
 157 done
 158
 159 eval "set -- $operands "'${1+"$@"}'
 160
 161 if test $have_pat -eq 0; then
 162   case ${1?"missing pattern; try \`$0 --help' for help"} in
 163   (*\'*)
 164     grep="$grep -- '"$(printf '%s\n' "$1" | sed "$escape");;
 165   (*)
 166     grep="$grep -- '$1'";;
 167   esac
 168   shift
 169 fi
 170
 171 if test $# -eq 0; then
 172   set -- -
 173 fi
 174
 175 exec 3>&1
 176 res=1
 177
 178 for i
 179 do
 180   # Fail if gzip or grep (or sed) fails.
 181   gzip_status=$(
 182     exec 5>&1
 183     (gzip -cdfq -- "$i" 5>&-; echo $? >&5) 3>&- |
 184     if test $files_with_matches -eq 1; then
 185       eval "$grep" >/dev/null && { printf '%s\n' "$i" || exit 2; }
 186     elif test $files_without_matches -eq 1; then
 187       eval "$grep" >/dev/null || {
 188         r=$?
 189         if test $r -eq 1; then
 190           printf '%s\n' "$i" || r=2
 191         fi
 192         exit $r
 193       }
 194     elif test $with_filename -eq 0 &&
 195          { test $# -eq 1 || test $no_filename -eq 1; }; then
 196       eval "$grep"
 197     else
 198       case $i in
 199       (*'
 200 '* | *'&'* | *'\'* | *'|'*)
 201         i=$(printf '%s\n' "$i" |
 202             sed '
 203               $!N
 204               $s/[&\|]/\\&/g
 205               $s/\n/\\n/g
 206             ');;
 207       esac
 208       sed_script="s|^|$i:|"
 209
 210       # Fail if grep or sed fails.
 211       r=$(
 212         exec 4>&1
 213         (eval "$grep" 4>&-; echo $? >&4) 3>&- | sed "$sed_script" >&3 4>&-
 214       ) && exit $r
 215       r=$?
 216       test 1 -lt $r && exit $r || exit 2
 217     fi >&3 5>&-
 218   )
 219   r=$?
 220
 221   # Ignore gzip status 2, as it is just a warning.
 222   # gzip status 1 is an error, like grep status 2.
 223   test $gzip_status -eq 2 && gzip_status=0
 224   test $gzip_status -eq 1 && gzip_status=2
 225
 226   # Use the more serious of the grep and gzip statuses.
 227   test $r -lt $gzip_status && r=$gzip_status
 228
 229   # Exit immediately on software configuration error.
 230   test 126 -le $r && exit $r
 231
 232   # Accumulate the greatest status, except consider 0 to be greater than 1.
 233   if test $r -le 1 && test $res -le 1; then
 234      test $r -lt $res
 235   else
 236      test $res -lt $r
 237   fi && res=$r
 238 done
 239 exit $res