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Avoid creating an undersized buffer for the hufts table.
[gzip] / zdiff.in
1 #!/bin/sh
2 # sh is buggy on RS/6000 AIX 3.2. Replace above line with #!/bin/ksh
3
4 # Copyright (C) 1998, 2002, 2006, 2007 Free Software Foundation
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 2 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 PATH=BINDIR:$PATH
22
23 case $1 in
24   --__cmp) shift
25         prog=cmp;  cmp='${CMP-cmp}'  ;;
26   *)    prog=diff; cmp='${DIFF-diff}';;
27 esac
28
29 version="z$prog (gzip) @VERSION@
30 Copyright (C) 2007 Free Software Foundation, Inc.
31 This is free software.  You may redistribute copies of it under the terms of
32 the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
33 There is NO WARRANTY, to the extent permitted by law.
34
35 Written by Jean-loup Gailly."
36
37 usage="Usage: $0 [OPTION]... FILE1 [FILE2]
38 Compare FILE1 to FILE2, using their uncompressed contents if they are
39 compressed.  If FILE2 is omitted, compare FILE1 to the uncompressed
40 contents of FILE1.gz.  Do comparisons like '$prog' does.
41
42 OPTIONs are the same as for '$prog'.
43
44 Report bugs to <bug-gzip@gnu.org>."
45
46 # sed script to escape all ' for the shell, and then (to handle trailing
47 # newlines correctly) turn trailing X on last line into '.
48 escape='
49   s/'\''/'\''\\'\'''\''/g
50   $s/X$/'\''/
51 '
52
53 while :; do
54   case $1 in
55   --h*) printf '%s\n' "$usage" || exit 2; exit;;
56   --v*) echo "$version" || exit 2; exit;;
57   --) shift; break;;
58   -*\'*) cmp="$cmp '"`printf '%sX\n' "$1" | sed "$escape"`;;
59   -?*) cmp="$cmp '$1'";;
60   *) break;;
61   esac
62   shift
63 done
64 cmp="$cmp --"
65
66 for file
67 do
68   test "X$file" = X- || <"$file" || exit 2
69 done
70
71 gzip_status=0
72 exec 3>&1
73
74 if test $# -eq 1; then
75   case $1 in
76   *[-.]gz* | *[-.][zZ] | *.t[ga]z)
77     FILE=`expr "X$1" : 'X\(.*\)[-.][zZtga]*$'`
78     gzip_status=$(
79       exec 4>&1
80       (gzip -cd -- "$1" 4>&-; echo $? >&4) 3>&- | eval "$cmp" - '"$FILE"' >&3
81     );;
82   *)
83     echo >&2 "$0: $1: unknown compressed file extension"
84     exit 2;;
85   esac
86 elif test $# -eq 2; then
87         case "$1" in
88         *[-.]gz* | *[-.][zZ] | *.t[ga]z | -)
89                 case "$2" in
90                 *[-.]gz* | *[-.][zZ] | *.t[ga]z | -)
91                     if test "$1$2" = --; then
92                         gzip_status=$(
93                           exec 4>&1
94                           (gzip -cdfq - 4>&-; echo $? >&4) 3>&- |
95                             eval "$cmp" - - >&3
96                         )
97                     elif
98                         # Reject Solaris 8's buggy /bin/bash 2.03.
99                         echo X |
100                          (echo X | eval "$cmp" /dev/fd/5 - >/dev/null 2>&1) \
101                                 5<&0
102                     then
103                         gzip_status=$(
104                           exec 4>&1
105                           (gzip -cdfq -- "$1" 4>&-; echo $? >&4) 3>&- |
106                             ( (gzip -cdfq -- "$2" 4>&-; echo $? >&4) 3>&- 5<&- </dev/null |
107                                eval "$cmp" /dev/fd/5 - >&3) 5<&0
108                         )
109                         case $gzip_status in
110                           *[1-9]*) gzip_status=1;;
111                           *) gzip_status=0;;
112                         esac
113                     else
114                         F=`expr "/$2" : '.*/\(.*\)[-.][zZtga]*$'` || F=$prog
115                         tmp=
116                         trap '
117                           test -n "$tmp" && rm -f "$tmp"
118                           (exit 2); exit 2
119                         ' HUP INT PIPE TERM 0
120                         if type mktemp >/dev/null 2>&1; then
121                           tmp=`mktemp -t -- "$F.XXXXXX"` || exit 2
122                         else
123                           set -C
124                           tmp=${TMPDIR-/tmp}/$F.$$
125                         fi
126                         gzip -cdfq -- "$2" > "$tmp" || exit 2
127                         gzip_status=$(
128                           exec 4>&1
129                           (gzip -cdfq -- "$1" 4>&-; echo $? >&4) 3>&- |
130                             eval "$cmp" - '"$tmp"' >&3
131                         )
132                         cmp_status=$?
133                         rm -f "$tmp" || gzip_status=$?
134                         trap - HUP INT PIPE TERM 0
135                         (exit $cmp_status)
136                     fi;;
137                 *)
138                     gzip_status=$(
139                       exec 4>&1
140                       (gzip -cdfq -- "$1" 4>&-; echo $? >&4) 3>&- |
141                         eval "$cmp" - '"$2"' >&3
142                     );;
143                 esac;;
144         *)      case "$2" in
145                 *[-.]gz* | *[-.][zZ] | *.t[ga]z | -)
146                         gzip_status=$(
147                           exec 4>&1
148                           (gzip -cdfq -- "$2" 4>&-; echo $? >&4) 3>&- |
149                             eval "$cmp" '"$1"' - >&3
150                         );;
151                 *)      eval "$cmp" '"$1"' '"$2"';;
152                 esac;;
153         esac
154 else
155         echo >&2 "$0: invalid number of operands; try \`$0 --help' for help"
156         exit 2
157 fi
158
159 cmp_status=$?
160 test "$gzip_status" -eq 0 || exit 2
161 exit $cmp_status