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|
#!/bin/sh
check=0
pipe=0
opt=
files=
keep=0
res=0
old=0
new=0
block=1024
# block is the disk block size (best guess, need not be exact)
warn="(does not preserve modes and timestamp)"
tmp=/tmp/zfoo.$$
echo hi > $tmp.1
echo hi > $tmp.2
if test -z "`(${CPMOD-cpmod} $tmp.1 $tmp.2) 2>&1`"; then
cpmod=${CPMOD-cpmod}
warn=""
fi
if test -z "$cpmod" && ${TOUCH-touch} -r $tmp.1 $tmp.2 2>/dev/null; then
cpmod="${TOUCH-touch}"
cpmodarg="-r"
warn="(does not preserve file modes)"
fi
# check if GZIP env. variable uses -S or --suffix
gzip -q $tmp.1
ext=`echo $tmp.1* | sed "s|$tmp.1||"`
rm -f $tmp.[12]*
if test -z "$ext"; then
echo znew: error determining gzip extension
exit 1
fi
if test "$ext" = ".Z"; then
echo znew: cannot use .Z as gzip extension.
exit 1
fi
for arg
do
case "$arg" in
-*) opt="$opt $arg"; shift;;
*) break;;
esac
done
if test $# -eq 0; then
echo "recompress .Z files into $ext (gzip) files"
echo usage: `echo $0 | sed 's,^.*/,,'` "[-tv9KP]" file.Z...
echo " -t tests the new files before deleting originals"
echo " -v be verbose"
echo " -9 use the slowest compression method (optimal compression)"
echo " -K keep a .Z file when it is smaller than the $ext file"
echo " -P use pipes for the conversion $warn"
exit 1
fi
opt=`echo "$opt" | sed -e 's/ //g' -e 's/-//g'`
case "$opt" in
*t*) check=1; opt=`echo "$opt" | sed 's/t//g'`
esac
case "$opt" in
*K*) keep=1; opt=`echo "$opt" | sed 's/K//g'`
esac
case "$opt" in
*P*) pipe=1; opt=`echo "$opt" | sed 's/P//g'`
esac
if test -n "$opt"; then
opt="-$opt"
fi
for i do
n=`echo $i | sed 's/.Z$//'`
if test ! -f "$n.Z" ; then
echo $n.Z not found
res=1; continue
fi
test $keep -eq 1 && old=`wc -c < "$n.Z"`
if test $pipe -eq 1; then
if gzip -d < "$n.Z" | gzip $opt > "$n$ext"; then
# Copy file attributes from old file to new one, if possible.
test -n "$cpmod" && $cpmod $cpmodarg "$n.Z" "$n$ext" 2> /dev/null
else
echo error while recompressing $n.Z
res=1; continue
fi
else
if test $check -eq 1; then
if cp -p "$n.Z" "$n.$$" 2> /dev/null || cp "$n.Z" "$n.$$"; then
:
else
echo cannot backup "$n.Z"
res=1; continue
fi
fi
if gzip -d "$n.Z"; then
:
else
test $check -eq 1 && mv "$n.$$" "$n.Z"
echo error while uncompressing $n.Z
res=1; continue
fi
if gzip $opt "$n"; then
:
else
if test $check -eq 1; then
mv "$n.$$" "$n.Z" && rm -f "$n"
echo error while recompressing $n
else
# compress $n (might be dangerous if disk full)
echo error while recompressing $n, left uncompressed
fi
res=1; continue
fi
fi
test $keep -eq 1 && new=`wc -c < "$n$ext"`
if test $keep -eq 1 -a `expr \( $old + $block - 1 \) / $block` -lt \
`expr \( $new + $block - 1 \) / $block`; then
if test $pipe -eq 1; then
rm -f "$n$ext"
elif test $check -eq 1; then
mv "$n.$$" "$n.Z" && rm -f "$n$ext"
else
gzip -d "$n$ext" && compress "$n" && rm -f "$n$ext"
fi
echo "$n.Z smaller than $n$ext -- unchanged"
elif test $check -eq 1; then
if gzip -t "$n$ext" ; then
rm -f "$n.$$" "$n.Z"
else
test $pipe -eq 0 && mv "$n.$$" "$n.Z"
rm -f "$n$ext"
echo error while testing $n$ext, $n.Z unchanged
res=1; continue
fi
elif test $pipe -eq 1; then
rm -f "$n.Z"
fi
done
exit $res
|
