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, 2009-2022 Free Software Foundation,
   7 # 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 grep='${GREP-'\''@GREP@'\''}'
  26 args=
  27
  28 version='zgrep (gzip) @VERSION@
  29 Copyright (C) 2022 Free Software Foundation, Inc.
  30 This is free software.  You may redistribute copies of it under the terms of
  31 the GNU General Public License <https://www.gnu.org/licenses/gpl.html>.
  32 There is NO WARRANTY, to the extent permitted by law.
  33
  34 Written by Jean-loup Gailly.'
  35
  36 usage="Usage: $0 [OPTION]... [-e] PATTERN [FILE]...
  37 Look for instances of PATTERN in the input FILEs, using their
  38 uncompressed contents if they are compressed.
  39
  40 OPTIONs are the same as for 'grep', except that the following 'grep'
  41 options are not supported: --dereference-recursive (-R), --directories (-d),
  42 --exclude, --exclude-from, --exclude-dir, --include, --null (-Z),
  43 --null-data (-z), and --recursive (-r).
  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) append ' to the last line.
  49 escape='
  50   s/'\''/'\''\\'\'''\''/g
  51   $s/$/'\''/
  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 pattmp=
  60
  61 while test $# -ne 0; do
  62   option=$1
  63   shift
  64   optarg=
  65
  66   case $option in
  67   (-[0123456789EFGHIKLPRTUVZabchilnoqrsuvwxyz]*[!0123456789]*)
  68     arg2=-\'$(LC_ALL=C expr "X$option" : 'X-.[0-9]*\(.*\)' |
  69                 LC_ALL=C sed "$escape")
  70     eval "set -- $arg2 "'${1+"$@"}'
  71     option=$(LC_ALL=C 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' "$1" | LC_ALL=C sed "$escape");;
  78     (*)
  79       optarg=" '$1'";;
  80     esac
  81     shift;;
  82   (-f?*\'*)
  83     optarg=" '"$(LC_ALL=C expr "X$option" : 'X-f\(.*\)' |
  84                    LC_ALL=C sed "$escape")
  85     option=-f;;
  86   (-f?*)
  87     optarg=" '"$(LC_ALL=C expr "X$option" : 'X-f\(.*\)')\'
  88     option=-f;;
  89   (--file=*\'*)
  90     optarg=" '"$(LC_ALL=C expr "X$option" : 'X--file=\(.*\)' |
  91                    LC_ALL=C sed "$escape")
  92     option=--file;;
  93   (--file=*)
  94     optarg=" '"$(LC_ALL=C expr "X$option" : 'X--file=\(.*\)')\'
  95     option=--file;;
  96   (--)
  97     break;;
  98   (-?*)
  99     ;;
 100   (*)
 101     case $option in
 102     (*\'*)
 103       operands="$operands '"$(printf '%s\n' "$option" | LC_ALL=C sed "$escape")
 104       ;;
 105     (*)
 106       operands="$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     # Similarly if it is not a regular file, since it might be read repeatedly.
 123     # In either of these two cases, copy the pattern into a temporary file,
 124     # and use that file instead.  The pattern might contain null bytes,
 125     # so we cannot simply switch to -e here.
 126     if case $optarg in
 127        (" '-'" | " '/dev/stdin'" | " '/dev/fd/0'")
 128          :;;
 129        (*)
 130          eval "test ! -f$optarg";;
 131        esac
 132     then
 133       if test -n "$pattmp"; then
 134         eval "cat --$optarg" >>"$pattmp" || exit 2
 135         continue
 136       fi
 137       trap '
 138         test -n "$pattmp" && rm -f "$pattmp"
 139         (exit 2); exit 2
 140       ' HUP INT PIPE TERM 0
 141       case $TMPDIR in
 142         / | /*/) ;;
 143         /*) TMPDIR=$TMPDIR/;;
 144         *) TMPDIR=/tmp/;;
 145       esac
 146       if type mktemp >/dev/null 2>&1; then
 147         pattmp=$(mktemp "${TMPDIR}zgrepXXXXXXXXX") || exit 2
 148       else
 149         set -C
 150         pattmp=${TMPDIR}zgrep$$
 151       fi
 152       eval "cat --$optarg" >"$pattmp" || exit 2
 153       optarg=' "$pattmp"'
 154     fi
 155     have_pat=1;;
 156   (--h | --he | --hel | --help)
 157     printf '%s\n' "$usage" || exit 2
 158     exit;;
 159   (-H | --wi | --wit | --with | --with- | --with-f | --with-fi \
 160   | --with-fil | --with-file | --with-filen | --with-filena | --with-filenam \
 161   | --with-filename)
 162     with_filename=1
 163     continue;;
 164   (-l | --files-with-*)
 165     files_with_matches=1;;
 166   (-L | --files-witho*)
 167     files_without_matches=1;;
 168   (-h | --no-f*)
 169     no_filename=1;;
 170   (-V | --v | --ve | --ver | --vers | --versi | --versio | --version)
 171     printf '%s\n' "$version" || exit 2
 172     exit;;
 173   esac
 174
 175   case $option in
 176   (*\'?*)
 177     option=\'$(printf '%s\n' "$option" | LC_ALL=C sed "$escape");;
 178   (*)
 179     option="'$option'";;
 180   esac
 181
 182   args="$args $option$optarg"
 183 done
 184
 185 eval "set -- $operands "'${1+"$@"}'
 186
 187 if test $have_pat -eq 0; then
 188   case ${1?"missing pattern; try \`$0 --help' for help"} in
 189   (*\'*)
 190     args="$args -- '"$(printf '%s\n' "$1" | LC_ALL=C sed "$escape");;
 191   (*)
 192     args="$args -- '$1'";;
 193   esac
 194   shift
 195 fi
 196
 197 if test $# -eq 0; then
 198   set -- -
 199 elif test 1 -lt $# && test $no_filename -eq 0; then
 200   with_filename=1
 201 fi
 202
 203 l_e=$(eval "(echo e | $grep -H --label=l e) 2>/dev/null") && test "$l_e" = l:e
 204 gnuish_grep="test $? -eq 0"
 205 if $gnuish_grep && test $with_filename -eq 1; then
 206   grep="$grep -H"
 207 fi
 208
 209 exec 3>&1
 210 res=1
 211
 212 for i
 213 do
 214   # Fail if gzip or grep (or sed) fails.
 215   gzip_status=$(
 216     exec 5>&1
 217     ('gzip' -cdfq -- "$i" 5>&-; echo $? >&5) 3>&- |
 218     if test $files_with_matches -eq 1; then
 219       eval "$grep$args" >/dev/null && { printf '%s\n' "$i" || exit 2; }
 220     elif test $files_without_matches -eq 1; then
 221       eval "$grep$args" >/dev/null || {
 222         r=$?
 223         if test $r -eq 1; then
 224           printf '%s\n' "$i" || r=2
 225         fi
 226         test 256 -le $r && r=$(expr 128 + $r % 128)
 227         exit $r
 228       }
 229     elif $gnuish_grep && test "$i" != -; then
 230       eval "$grep --label \"\$i\"$args"
 231     elif $gnuish_grep || test $with_filename -eq 0; then
 232       eval "$grep$args"
 233     else
 234       case $i in
 235       (*'
 236 '* | *'&'* | *'\'* | *'|'*)
 237           icolon=$(printf '%s\n' "$i:" |
 238                      LC_ALL=C sed -e 's/[&\|]/\\&/g' -e '$!s/$/\\/') ||
 239              icolon='(unknown filename):';;
 240       (*) icolon="$i:";;
 241       esac
 242       sed_script="s|^|$icolon|"
 243
 244       # Fail if grep or sed fails.
 245       r=$(
 246         exec 4>&1
 247         (eval "$grep$args" 4>&-; echo $? >&4) 3>&- |
 248            LC_ALL=C sed "$sed_script" >&3 4>&-
 249       ) || { r=$?; test $r -lt 2 && r=2; }
 250       test 256 -le $r && r=$(expr 128 + $r % 128)
 251       exit $r
 252     fi >&3 5>&-
 253   )
 254   r=$?
 255
 256   # Ignore gzip status 2, as it is just a warning.
 257   # gzip status 1 is an error, like grep status 2.
 258   test $gzip_status -eq 2 && gzip_status=0
 259   test $gzip_status -eq 1 && gzip_status=2
 260
 261   # Use the more serious of the grep and gzip statuses.
 262   test $r -lt $gzip_status && r=$gzip_status
 263
 264   # Accumulate the greatest status, except consider 0 to be greater than 1.
 265   if test $r -le 1 && test $res -le 1; then
 266      test $r -lt $res
 267   else
 268      test $res -lt $r
 269   fi && res=$r
 270
 271   # Exit immediately on a serious error.
 272   test 126 -le $res && break
 273 done
 274
 275 if test -n "$pattmp"; then
 276   rm -f "$pattmp" || {
 277     r=$?
 278     test $r -lt 2 && r=2
 279     test $res -lt $r && res=$r
 280   }
 281   trap - HUP INT PIPE TERM 0
 282 fi
 283
 284 test 128 -le $res && kill -$(expr $res % 128) $$
 285 exit $res