znew.in

   1 #!/bin/sh
   2
   3 # Copyright (C) 1998, 2002, 2004, 2007, 2010-2022 Free Software Foundation,
   4 # Inc.
   5 # Copyright (C) 1993 Jean-loup Gailly
   6
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3 of the License, or
  10 # (at your option) any later version.
  11
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16
  17 # You should have received a copy of the GNU General Public License along
  18 # with this program; if not, write to the Free Software Foundation, Inc.,
  19 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20
  21 version="znew (gzip) @VERSION@
  22 Copyright (C) 2010-2018 Free Software Foundation, Inc.
  23 This is free software.  You may redistribute copies of it under the terms of
  24 the GNU General Public License <https://www.gnu.org/licenses/gpl.html>.
  25 There is NO WARRANTY, to the extent permitted by law.
  26
  27 Written by Jean-loup Gailly."
  28
  29 usage="Usage: $0 [OPTION]... [FILE]...
  30 Recompress files from .Z (compress) format to .gz (gzip) format.
  31
  32 Options:
  33
  34   -f     Force recompression even if a .gz file already exists.
  35   -t     Test the new files before deleting originals.
  36   -v     Verbose; display name and statistics for each file compressed.
  37   -9     Use the slowest compression method (optimal compression).
  38   -P     Use pipes for the conversion to reduce disk space usage.
  39   -K     Keep a .Z file when it is smaller than the .gz file; implies -t.
  40       --help     display this help and exit
  41       --version  output version information and exit
  42
  43 Report bugs to <bug-gzip@gnu.org>."
  44
  45 check=0
  46 pipe=0
  47 opt=
  48 files=
  49 keep=0
  50 res=0
  51 old=0
  52 new=0
  53 block=1024
  54 # block is the disk block size (best guess, need not be exact)
  55
  56 # Beware -s or --suffix in $GZIP.
  57 unset GZIP
  58 ext=.gz
  59
  60 for arg
  61 do
  62   case "$arg" in
  63   --help)      printf '%s\n' "$usage"   || exit 1; exit;;
  64   --version)   printf '%s\n' "$version" || exit 1; exit;;
  65   -*)     opt="$opt $arg"; shift;;
  66    *)     break;;
  67   esac
  68 done
  69
  70 if test $# -eq 0; then
  71   echo >&2 "$0: invalid number of operands; try \`$0 --help' for help"
  72   exit 1
  73 fi
  74
  75 opt=`printf '%s\n' "$opt" | sed -e 's/ //g' -e 's/-//g'`
  76 case "$opt" in
  77   *t*) check=1; opt=`printf '%s\n' "$opt" | sed 's/t//g'`
  78 esac
  79 case "$opt" in
  80   *K*) keep=1; check=1; opt=`printf '%s\n' "$opt" | sed 's/K//g'`
  81 esac
  82 case "$opt" in
  83   *P*) pipe=1; opt=`printf '%s\n' "$opt" | sed 's/P//g'`
  84 esac
  85 if test -n "$opt"; then
  86   opt="-$opt"
  87 fi
  88
  89 for i do
  90   n=`printf '%s\n' "$i" | sed 's/.Z$//'`
  91   if test ! -f "$n.Z" ; then
  92     printf '%s\n' "$n.Z not found"
  93     res=1; continue
  94   fi
  95   test $keep -eq 1 && old=`wc -c < "$n.Z"`
  96   if test $pipe -eq 1; then
  97     if gzip -d < "$n.Z" | gzip $opt > "$n$ext"; then
  98       # Copy file attributes from old file to new one, if possible.
  99       touch -r"$n.Z" -- "$n$ext" 2>/dev/null
 100       chmod --reference="$n.Z" -- "$n$ext" 2>/dev/null
 101     else
 102       printf '%s\n' "error while recompressing $n.Z"
 103       res=1; continue
 104     fi
 105   else
 106     if test $check -eq 1; then
 107       if cp -p "$n.Z" "$n.$$"; then
 108         :
 109       else
 110         printf '%s\n' "cannot backup $n.Z"
 111         res=1; continue
 112       fi
 113     fi
 114     if gzip -d "$n.Z"; then
 115       :
 116     else
 117       test $check -eq 1 && mv "$n.$$" "$n.Z"
 118       printf '%s\n' "error while uncompressing $n.Z"
 119       res=1; continue
 120     fi
 121     if gzip $opt "$n"; then
 122       :
 123     else
 124       if test $check -eq 1; then
 125         mv "$n.$$" "$n.Z" && rm -f "$n"
 126         printf '%s\n' "error while recompressing $n"
 127       else
 128         # compress $n  (might be dangerous if disk full)
 129         printf '%s\n' "error while recompressing $n, left uncompressed"
 130       fi
 131       res=1; continue
 132     fi
 133   fi
 134   test $keep -eq 1 && new=`wc -c < "$n$ext"`
 135   if test $keep -eq 1 && test `expr \( $old + $block - 1 \) / $block` -lt \
 136                               `expr \( $new + $block - 1 \) / $block`; then
 137     if test $pipe -eq 1; then
 138       rm -f "$n$ext"
 139     else
 140       mv "$n.$$" "$n.Z" && rm -f "$n$ext"
 141     fi
 142     printf '%s\n' "$n.Z smaller than $n$ext -- unchanged"
 143
 144   elif test $check -eq 1; then
 145     if gzip -t "$n$ext" ; then
 146       rm -f "$n.$$" "$n.Z"
 147     else
 148       test $pipe -eq 0 && mv "$n.$$" "$n.Z"
 149       rm -f "$n$ext"
 150       printf '%s\n' "error while testing $n$ext, $n.Z unchanged"
 151       res=1; continue
 152     fi
 153   elif test $pipe -eq 1; then
 154     rm -f "$n.Z"
 155   fi
 156 done
 157 exit $res