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 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 2 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 PATH="BINDIR:$PATH"; export PATH
  24
  25 case "$0" in
  26         *egrep) grep=${EGREP-egrep}     ;;
  27         *fgrep) grep=${FGREP-fgrep}     ;;
  28         *)      grep=${GREP-grep}       ;;
  29 esac
  30
  31 version="z$grep (gzip) @VERSION@
  32 Copyright (C) 2006 Free Software Foundation, Inc.
  33 This is free software.  You may redistribute copies of it under the terms of
  34 the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
  35 There is NO WARRANTY, to the extent permitted by law.
  36
  37 Written by Jean-loup Gailly."
  38
  39 usage="Usage: z$grep [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 pat=""
  48 after_dash_dash=""
  49 files_with_matches=0
  50 files_without_matches=0
  51 no_filename=0
  52 with_filename=0
  53
  54 while test $# -ne 0; do
  55   case "$after_dash_dash$1" in
  56   --d* | --rec*)        echo >&2 "$0: $1: option not supported"; exit 2;;
  57   --h*)                 echo "$usage" || exit 2; exit;;
  58   --files-with-*)       files_with_matches=1;;
  59   --files-witho*)       files_without_matches=1;;
  60   --no-f*)      no_filename=1;;
  61   --v*)         echo "$version" || exit 2; exit;;
  62   --wi*)        with_filename=1;;
  63   --*)  ;;
  64   -*)
  65         case "$1" in
  66         -*[dr]*) echo >&2 "$0: $1: option not supported"; exit 2;;
  67         esac
  68         case "$1" in
  69         -*H*)   with_filename=1;;
  70         esac
  71         case "$1" in
  72         -*h*)   no_filename=1;;
  73         esac
  74         case "$1" in
  75         -*L*)   files_without_matches=1;;
  76         esac
  77         case "$1" in
  78         -*l*)   files_with_matches=1;;
  79         esac;;
  80   esac
  81   case "$after_dash_dash$1" in
  82   -[ef])   opt="$opt $1"; shift; pat="$1"
  83            if test "$grep" = grep; then  # grep is buggy with -e on SVR4
  84              grep=egrep
  85            fi;;
  86   -[ABCdm])opt="$opt $1 $2"; shift;;
  87   --)      opt="$opt $1"; after_dash_dash=1;;
  88   -*)      opt="$opt $1";;
  89    *)      if test -z "$pat"; then
  90              pat="$1"
  91            else
  92              break;
  93            fi;;
  94   esac
  95   shift
  96 done
  97
  98 if test -z "$pat"; then
  99   echo "$usage"
 100   exit 2
 101 fi
 102
 103 if test $# -eq 0; then
 104   gzip -cdfq | $grep $opt "$pat"
 105   exit $?
 106 fi
 107
 108 res=0
 109 for i do
 110   gzip -cdfq -- "$i" |
 111     if test $files_with_matches -eq 1; then
 112       $grep $opt "$pat" > /dev/null && printf '%s\n' "$i"
 113     elif test $files_without_matches -eq 1; then
 114       $grep $opt "$pat" > /dev/null || printf '%s\n' "$i"
 115     elif test $with_filename -eq 0 && { test $# -eq 1 || test $no_filename -eq 1; }; then
 116       $grep $opt "$pat"
 117     else
 118       escaped=
 119       while :; do
 120         case $i in
 121         *'
 122 '*)
 123           char='
 124 '         repl='\\n';;
 125         *'&'*) char='&' repl='\&';;
 126         *'\'*) char='\\' repl='\\';;
 127         *'|'*) char='|' repl='\|';;
 128         *) break;;
 129         esac
 130         up_to_first_char="\\([^$char]*\\)"
 131         after_first_char="[^$char]*$char\\(.*\\)"
 132         escaped=$escaped`expr "X$i" : "X$up_to_first_char"`$repl
 133         i=`expr "X$i" : "$after_first_char"`
 134       done
 135       if test $with_filename -eq 1; then
 136         sed_script="s|[^:]*|$escaped$i|"
 137       else
 138         sed_script="s|^|$escaped$i:|"
 139       fi
 140
 141       # Fail if either grep or sed fails.
 142       # Bash has ${PIPESTATUS[0]}, but that's not portable.
 143       exec 3>&1
 144       r=`
 145         exec 4>&1
 146         ($grep $opt "$pat" 4>&-; echo $? >&4) 3>&- | sed "$sed_script" >&3 4>&-
 147       ` &&
 148       exit $r
 149     fi
 150   r=$?
 151   test $res -lt $r && res=$r
 152 done
 153 exit $res