znew.in

   1 #!/bin/sh
   2
   3 # Copyright (C) 1998, 2002, 2004, 2007, 2010 Free Software Foundation
   4 # Copyright (C) 1993 Jean-loup Gailly
   5
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 3 of the License, or
   9 # (at your option) any later version.
  10
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15
  16 # You should have received a copy of the GNU General Public License along
  17 # with this program; if not, write to the Free Software Foundation, Inc.,
  18 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19
  20 bindir=@bindir@
  21 case $1 in
  22 --__bindir) bindir=${2?}; shift; shift;;
  23 esac
  24 PATH=$bindir:$PATH; export PATH
  25
  26 version="znew (gzip) @VERSION@
  27 Copyright (C) 2010-2011 Free Software Foundation, Inc.
  28 This is free software.  You may redistribute copies of it under the terms of
  29 the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
  30 There is NO WARRANTY, to the extent permitted by law.
  31
  32 Written by Jean-loup Gailly."
  33
  34 usage="Usage: $0 [OPTION]... [FILE]...
  35 Recompress files from .Z (compress) format to .gz (gzip) format.
  36
  37 Options:
  38
  39   -f     Force recompression even if a .gz file already exists.
  40   -t     Test the new files before deleting originals.
  41   -v     Verbose; display name and statistics for each file compressed.
  42   -9     Use the slowest compression method (optimal compression).
  43   -P     Use pipes for the conversion to reduce disk space usage.
  44   -K     Keep a .Z file when it is smaller than the .gz file; implies -t.
  45       --help     display this help and exit
  46       --version  output version information and exit
  47
  48 Report bugs to <bug-gzip@gnu.org>."
  49
  50 check=0
  51 pipe=0
  52 opt=
  53 files=
  54 keep=0
  55 res=0
  56 old=0
  57 new=0
  58 block=1024
  59 # block is the disk block size (best guess, need not be exact)
  60
  61 warn="(does not preserve modes and timestamp)"
  62 tmp=${TMPDIR-/tmp}/zfoo.$$
  63 set -C
  64 echo hi > $tmp || exit
  65 if test -z "`(${CPMOD-cpmod} $tmp $tmp) 2>&1`"; then
  66   cpmod=${CPMOD-cpmod}
  67   warn=""
  68 fi
  69
  70 if test -z "$cpmod" && ${TOUCH-touch} -r $tmp $tmp 2>/dev/null; then
  71   cpmod="${TOUCH-touch}"
  72   cpmodarg="-r"
  73   warn="(does not preserve file modes)"
  74 fi
  75
  76 # check if GZIP env. variable uses -S or --suffix
  77 gzip -q $tmp
  78 ext=`echo $tmp* | sed "s|$tmp||"`
  79 rm -f $tmp*
  80 if test -z "$ext"; then
  81   echo znew: error determining gzip extension
  82   exit 1
  83 fi
  84 if test "$ext" = ".Z"; then
  85   echo znew: cannot use .Z as gzip extension.
  86   exit 1
  87 fi
  88
  89 for arg
  90 do
  91   case "$arg" in
  92   --help)      exec echo "$usage";;
  93   --version)   exec echo "$version";;
  94   -*)     opt="$opt $arg"; shift;;
  95    *)     break;;
  96   esac
  97 done
  98
  99 if test $# -eq 0; then
 100   echo >&2 "$0: invalid number of operands; try \`$0 --help' for help"
 101   exit 1
 102 fi
 103
 104 opt=`echo "$opt" | sed -e 's/ //g' -e 's/-//g'`
 105 case "$opt" in
 106   *t*) check=1; opt=`echo "$opt" | sed 's/t//g'`
 107 esac
 108 case "$opt" in
 109   *K*) keep=1; check=1; opt=`echo "$opt" | sed 's/K//g'`
 110 esac
 111 case "$opt" in
 112   *P*) pipe=1; opt=`echo "$opt" | sed 's/P//g'`
 113 esac
 114 if test -n "$opt"; then
 115   opt="-$opt"
 116 fi
 117
 118 for i do
 119   n=`echo $i | sed 's/.Z$//'`
 120   if test ! -f "$n.Z" ; then
 121     echo $n.Z not found
 122     res=1; continue
 123   fi
 124   test $keep -eq 1 && old=`wc -c < "$n.Z"`
 125   if test $pipe -eq 1; then
 126     if gzip -d < "$n.Z" | gzip $opt > "$n$ext"; then
 127       # Copy file attributes from old file to new one, if possible.
 128       test -n "$cpmod" && $cpmod $cpmodarg "$n.Z" "$n$ext" 2> /dev/null
 129     else
 130       echo error while recompressing $n.Z
 131       res=1; continue
 132     fi
 133   else
 134     if test $check -eq 1; then
 135       if cp -p "$n.Z" "$n.$$" 2> /dev/null || cp "$n.Z" "$n.$$"; then
 136         :
 137       else
 138         echo cannot backup "$n.Z"
 139         res=1; continue
 140       fi
 141     fi
 142     if gzip -d "$n.Z"; then
 143       :
 144     else
 145       test $check -eq 1 && mv "$n.$$" "$n.Z"
 146       echo error while uncompressing $n.Z
 147       res=1; continue
 148     fi
 149     if gzip $opt "$n"; then
 150       :
 151     else
 152       if test $check -eq 1; then
 153         mv "$n.$$" "$n.Z" && rm -f "$n"
 154         echo error while recompressing $n
 155       else
 156         # compress $n  (might be dangerous if disk full)
 157         echo error while recompressing $n, left uncompressed
 158       fi
 159       res=1; continue
 160     fi
 161   fi
 162   test $keep -eq 1 && new=`wc -c < "$n$ext"`
 163   if test $keep -eq 1 && test `expr \( $old + $block - 1 \) / $block` -lt \
 164                               `expr \( $new + $block - 1 \) / $block`; then
 165     if test $pipe -eq 1; then
 166       rm -f "$n$ext"
 167     else
 168       mv "$n.$$" "$n.Z" && rm -f "$n$ext"
 169     fi
 170     echo "$n.Z smaller than $n$ext -- unchanged"
 171
 172   elif test $check -eq 1; then
 173     if gzip -t "$n$ext" ; then
 174       rm -f "$n.$$" "$n.Z"
 175     else
 176       test $pipe -eq 0 && mv "$n.$$" "$n.Z"
 177       rm -f "$n$ext"
 178       echo error while testing $n$ext, $n.Z unchanged
 179       res=1; continue
 180     fi
 181   elif test $pipe -eq 1; then
 182     rm -f "$n.Z"
 183   fi
 184 done
 185 exit $res