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1 | package File::Compare; |
2 | |
3 | use strict; |
4 | use vars qw($VERSION @ISA @EXPORT @EXPORT_OK $Too_Big *FROM *TO); |
5 | |
6 | require Exporter; |
7 | use Carp; |
8 | use UNIVERSAL qw(isa); |
9 | |
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10 | $VERSION = '1.1001'; |
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11 | @ISA = qw(Exporter); |
12 | @EXPORT = qw(compare); |
13 | @EXPORT_OK = qw(cmp); |
14 | |
15 | $Too_Big = 1024 * 1024 * 2; |
16 | |
17 | sub VERSION { |
18 | # Version of File::Compare |
19 | return $File::Compare::VERSION; |
20 | } |
21 | |
22 | sub compare { |
23 | croak("Usage: compare( file1, file2 [, buffersize]) ") |
24 | unless(@_ == 2 || @_ == 3); |
25 | |
26 | my $from = shift; |
27 | my $to = shift; |
28 | my $closefrom=0; |
29 | my $closeto=0; |
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30 | my ($size, $fromsize, $status, $fr, $tr, $fbuf, $tbuf); |
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31 | local(*FROM, *TO); |
32 | local($\) = ''; |
33 | |
34 | croak("from undefined") unless (defined $from); |
35 | croak("to undefined") unless (defined $to); |
36 | |
37 | if (ref($from) && (isa($from,'GLOB') || isa($from,'IO::Handle'))) { |
38 | *FROM = *$from; |
39 | } elsif (ref(\$from) eq 'GLOB') { |
40 | *FROM = $from; |
41 | } else { |
42 | open(FROM,"<$from") or goto fail_open1; |
43 | binmode FROM; |
44 | $closefrom = 1; |
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45 | $fromsize = -s FROM; |
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46 | } |
47 | |
48 | if (ref($to) && (isa($to,'GLOB') || isa($to,'IO::Handle'))) { |
49 | *TO = *$to; |
50 | } elsif (ref(\$to) eq 'GLOB') { |
51 | *TO = $to; |
52 | } else { |
53 | open(TO,"<$to") or goto fail_open2; |
54 | binmode TO; |
55 | $closeto = 1; |
56 | } |
57 | |
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58 | if ($closefrom && $closeto) { |
59 | # If both are opened files we know they differ if their size differ |
60 | goto fail_inner if $fromsize != -s TO; |
61 | } |
62 | |
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63 | if (@_) { |
64 | $size = shift(@_) + 0; |
65 | croak("Bad buffer size for compare: $size\n") unless ($size > 0); |
66 | } else { |
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67 | $size = $fromsize; |
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68 | $size = 1024 if ($size < 512); |
69 | $size = $Too_Big if ($size > $Too_Big); |
70 | } |
71 | |
72 | $fbuf = ''; |
73 | $tbuf = ''; |
74 | while(defined($fr = read(FROM,$fbuf,$size)) && $fr > 0) { |
75 | unless (defined($tr = read(TO,$tbuf,$fr)) and $tbuf eq $fbuf) { |
76 | goto fail_inner; |
77 | } |
78 | } |
79 | goto fail_inner if (defined($tr = read(TO,$tbuf,$size)) && $tr > 0); |
80 | |
81 | close(TO) || goto fail_open2 if $closeto; |
82 | close(FROM) || goto fail_open1 if $closefrom; |
83 | |
84 | return 0; |
85 | |
86 | # All of these contortions try to preserve error messages... |
87 | fail_inner: |
88 | close(TO) || goto fail_open2 if $closeto; |
89 | close(FROM) || goto fail_open1 if $closefrom; |
90 | |
91 | return 1; |
92 | |
93 | fail_open2: |
94 | if ($closefrom) { |
95 | $status = $!; |
96 | $! = 0; |
97 | close FROM; |
98 | $! = $status unless $!; |
99 | } |
100 | fail_open1: |
101 | return -1; |
102 | } |
103 | |
104 | *cmp = \&compare; |
105 | |
106 | 1; |
107 | |
108 | __END__ |
109 | |
110 | =head1 NAME |
111 | |
112 | File::Compare - Compare files or filehandles |
113 | |
114 | =head1 SYNOPSIS |
115 | |
116 | use File::Compare; |
117 | |
118 | if (compare("file1","file2") == 0) { |
119 | print "They're equal\n"; |
120 | } |
121 | |
122 | =head1 DESCRIPTION |
123 | |
124 | The File::Compare::compare function compares the contents of two |
125 | sources, each of which can be a file or a file handle. It is exported |
126 | from File::Compare by default. |
127 | |
128 | File::Compare::cmp is a synonym for File::Compare::compare. It is |
129 | exported from File::Compare only by request. |
130 | |
131 | =head1 RETURN |
132 | |
133 | File::Compare::compare return 0 if the files are equal, 1 if the |
134 | files are unequal, or -1 if an error was encountered. |
135 | |
136 | =head1 AUTHOR |
137 | |
138 | File::Compare was written by Nick Ing-Simmons. |
139 | Its original documentation was written by Chip Salzenberg. |
140 | |
141 | =cut |
142 | |