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 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, 2009-2010 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 pat_on_stdin=0
  56 files_with_matches=0
  57 files_without_matches=0
  58 no_filename=0
  59 with_filename=0
  60
  61 while test $# -ne 0; do
  62   option=$1
  63   shift
  64   optarg=
  65
  66   case $option in
  67   (-[0123456789EFGHIKLPRTUVZabchilnoqrsuvwxyz]?*)
  68     arg2=-\'$(expr "X${option}X" : 'X-.[0-9]*\(.*\)' | sed "$escape")
  69     eval "set -- $arg2 "'${1+"$@"}'
  70     option=$(expr "X$option" : 'X\(-.[0-9]*\)');;
  71   (--binary-*=* | --[lm]a*=* | --reg*=*)
  72     ;;
  73   (-[ABCDXdefm] | binary-* | --file | --[lm]a* | --reg*)
  74     case ${1?"$option option requires an argument"} in
  75     (*\'*)
  76       optarg=" '"$(printf '%sX\n' "$1" | sed "$escape");;
  77     (*)
  78       optarg=" '$1'";;
  79     esac
  80     shift;;
  81   (--)
  82     break;;
  83   (-?*)
  84     ;;
  85   (*)
  86     case $option in
  87     (*\'*)
  88       operands="$operands '"$(printf '%sX\n' "$option" | sed "$escape");;
  89     (*)
  90       operands="$operands '$option'";;
  91     esac
  92     ${POSIXLY_CORRECT+break}
  93     continue;;
  94   esac
  95
  96   case $option in
  97   (-[drRzZ] | --di* | --exc* | --inc* | --rec* | --nu*)
  98     printf >&2 '%s: %s: option not supported\n' "$0" "$option"
  99     exit 2;;
 100   (-[ef]* | --file | --file=* | --reg*)
 101     # The pattern is coming from a file rather than the command-line.
 102     # If the file is actually stdin then we need to do a little
 103     # magic, (since we use stdin to pass the gzip output to grep).
 104     # So find a free fd and change the argument to then use this
 105     # file descriptor for the pattern.
 106     case $optarg in
 107     (" '-'" | " '/dev/stdin'" | " '/dev/fd/0'")
 108       pat_on_stdin=1
 109       eval 'test -e .' 2>/dev/null \
 110         && eval 'exists(){ test -e "$@"; }' \
 111         || eval 'exists(){ test -r "$@" || test -w "$@"; }'
 112       # Start search from 6 since the script already uses 3 and 5
 113       fd=6
 114       pat_fd=
 115       while : ; do
 116         if ! exists /proc/$$/fd/$fd; then
 117           pat_fd=$fd
 118           break;
 119         fi
 120         fd=$(expr $fd + 1)
 121         if test $fd = 255; then
 122           printf >&2 '%s: no free file descriptor\n' "$0"
 123           exit 2
 124         fi
 125       done
 126       optarg=/dev/fd/$pat_fd;
 127     esac
 128     have_pat=1;;
 129   (--h | --he | --hel | --help)
 130     echo "$usage" || exit 2
 131     exit;;
 132   (-H | --wi | --wit | --with | --with- | --with-f | --with-fi \
 133   | --with-fil | --with-file | --with-filen | --with-filena | --with-filenam \
 134   | --with-filename)
 135     with_filename=1
 136     continue;;
 137   (-l | --files-with-*)
 138     files_with_matches=1;;
 139   (-L | --files-witho*)
 140     files_without_matches=1;;
 141   (-h | --no-f*)
 142     no_filename=1;;
 143   (-V | --v | --ve | --ver | --vers | --versi | --versio | --version)
 144     echo "$version" || exit 2
 145     exit;;
 146   esac
 147
 148   case $option in
 149   (*\'?*)
 150     option=\'$(expr "X${option}X" : 'X\(.*\)' | sed "$escape");;
 151   (*)
 152     option="'$option'";;
 153   esac
 154
 155   grep="$grep $option$optarg"
 156 done
 157
 158 eval "set -- $operands "'${1+"$@"}'
 159
 160 if test $have_pat -eq 0; then
 161   case ${1?"missing pattern; try \`$0 --help' for help"} in
 162   (*\'*)
 163     grep="$grep -- '"$(printf '%sX\n' "$1" | sed "$escape");;
 164   (*)
 165     grep="$grep -- '$1'";;
 166   esac
 167   shift
 168 fi
 169
 170 if test $# -eq 0; then
 171   set -- -
 172 fi
 173
 174 exec 3>&1
 175 res=0
 176
 177 for i
 178 do
 179   # Fail if gzip or grep (or sed) fails.
 180   gzip_status=$(
 181     exec 5>&1
 182     if test $pat_on_stdin -eq 1; then
 183       eval "exec $pat_fd<&0"
 184     fi
 185     (gzip -cdfq -- "$i" 5>&-; echo $? >&5) 3>&- |
 186     if test $files_with_matches -eq 1; then
 187       eval "$grep" >/dev/null && { printf '%s\n' "$i" || exit 2; }
 188     elif test $files_without_matches -eq 1; then
 189       eval "$grep" >/dev/null || {
 190         r=$?
 191         if test $r -eq 1; then
 192           printf '%s\n' "$i" || r=2
 193         fi
 194         exit $r
 195       }
 196     elif test $with_filename -eq 0 &&
 197          { test $# -eq 1 || test $no_filename -eq 1; }; then
 198       eval "$grep"
 199     else
 200       case $i in
 201       (*'
 202 '* | *'&'* | *'\'* | *'|'*)
 203         i=$(printf '%s\n' "$i" |
 204             sed '
 205               $!N
 206               $s/[&\|]/\\&/g
 207               $s/\n/\\n/g
 208             ');;
 209       esac
 210       sed_script="s|^|$i:|"
 211
 212       # Fail if grep or sed fails.
 213       r=$(
 214         exec 4>&1
 215         (eval "$grep" 4>&-; echo $? >&4) 3>&- | sed "$sed_script" >&3 4>&-
 216       ) && exit $r
 217       r=$?
 218       test $r -gt 128 && test $r -le 143 && exit $r || exit 2
 219     fi >&3 5>&-
 220   )
 221   r=$?
 222   if test $r -gt 128 && test $r -le 143; then
 223     kill -$(($r-128)) $$
 224     exit $r
 225   fi
 226   test "$gzip_status" -eq 0 || test "$gzip_status" -eq 2 || r=2
 227   test $res -lt $r && res=$r
 228 done
 229 exit $res