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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; |
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8 | |
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9 | $VERSION = '1.1002'; |
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10 | @ISA = qw(Exporter); |
11 | @EXPORT = qw(compare); |
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12 | @EXPORT_OK = qw(cmp compare_text); |
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13 | |
14 | $Too_Big = 1024 * 1024 * 2; |
15 | |
16 | sub VERSION { |
17 | # Version of File::Compare |
18 | return $File::Compare::VERSION; |
19 | } |
20 | |
21 | sub compare { |
22 | croak("Usage: compare( file1, file2 [, buffersize]) ") |
23 | unless(@_ == 2 || @_ == 3); |
24 | |
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25 | my ($from,$to,$size) = @_; |
26 | my $text_mode = defined($size) && $size < 0; |
27 | |
28 | my ($fromsize,$closefrom,$closeto); |
29 | local (*FROM, *TO); |
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30 | |
31 | croak("from undefined") unless (defined $from); |
32 | croak("to undefined") unless (defined $to); |
33 | |
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34 | if (ref($from) && |
35 | (UNIVERSAL::isa($from,'GLOB') || UNIVERSAL::isa($from,'IO::Handle'))) { |
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36 | *FROM = *$from; |
37 | } elsif (ref(\$from) eq 'GLOB') { |
38 | *FROM = $from; |
39 | } else { |
40 | open(FROM,"<$from") or goto fail_open1; |
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41 | unless ($text_mode) { |
42 | binmode FROM; |
43 | $fromsize = -s FROM; |
44 | } |
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45 | $closefrom = 1; |
46 | } |
47 | |
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48 | if (ref($to) && |
49 | (UNIVERSAL::isa($to,'GLOB') || UNIVERSAL::isa($to,'IO::Handle'))) { |
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50 | *TO = *$to; |
51 | } elsif (ref(\$to) eq 'GLOB') { |
52 | *TO = $to; |
53 | } else { |
54 | open(TO,"<$to") or goto fail_open2; |
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55 | binmode TO unless $text_mode; |
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56 | $closeto = 1; |
57 | } |
58 | |
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59 | if (!$text_mode && $closefrom && $closeto) { |
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60 | # If both are opened files we know they differ if their size differ |
61 | goto fail_inner if $fromsize != -s TO; |
62 | } |
63 | |
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64 | if ($text_mode) { |
65 | local $/ = "\n"; |
66 | my ($fline,$tline); |
67 | while (defined($fline = <FROM>)) { |
68 | unless (defined($tline = <TO>) && $fline eq $tline) { |
69 | goto fail_inner; |
70 | } |
71 | } |
72 | goto fail_inner if defined($tline = <TO>); |
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73 | } |
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74 | else { |
75 | unless (defined($size) && $size > 0) { |
76 | $size = $fromsize; |
77 | $size = 1024 if $size < 512; |
78 | $size = $Too_Big if $size > $Too_Big; |
79 | } |
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80 | |
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81 | my ($fr,$tr,$fbuf,$tbuf); |
82 | $fbuf = $tbuf = ''; |
83 | while(defined($fr = read(FROM,$fbuf,$size)) && $fr > 0) { |
84 | unless (defined($tr = read(TO,$tbuf,$fr)) && $tbuf eq $fbuf) { |
85 | goto fail_inner; |
86 | } |
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87 | } |
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88 | goto fail_inner if defined($tr = read(TO,$tbuf,$size)) && $tr > 0; |
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89 | } |
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90 | |
91 | close(TO) || goto fail_open2 if $closeto; |
92 | close(FROM) || goto fail_open1 if $closefrom; |
93 | |
94 | return 0; |
95 | |
96 | # All of these contortions try to preserve error messages... |
97 | fail_inner: |
98 | close(TO) || goto fail_open2 if $closeto; |
99 | close(FROM) || goto fail_open1 if $closefrom; |
100 | |
101 | return 1; |
102 | |
103 | fail_open2: |
104 | if ($closefrom) { |
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105 | my $status = $!; |
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106 | $! = 0; |
107 | close FROM; |
108 | $! = $status unless $!; |
109 | } |
110 | fail_open1: |
111 | return -1; |
112 | } |
113 | |
114 | *cmp = \&compare; |
115 | |
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116 | # Using a negative buffer size puts compare into text_mode |
117 | sub compare_text { compare(@_[0..1], -1) } |
118 | |
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119 | 1; |
120 | |
121 | __END__ |
122 | |
123 | =head1 NAME |
124 | |
125 | File::Compare - Compare files or filehandles |
126 | |
127 | =head1 SYNOPSIS |
128 | |
129 | use File::Compare; |
130 | |
131 | if (compare("file1","file2") == 0) { |
132 | print "They're equal\n"; |
133 | } |
134 | |
135 | =head1 DESCRIPTION |
136 | |
137 | The File::Compare::compare function compares the contents of two |
138 | sources, each of which can be a file or a file handle. It is exported |
139 | from File::Compare by default. |
140 | |
141 | File::Compare::cmp is a synonym for File::Compare::compare. It is |
142 | exported from File::Compare only by request. |
143 | |
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144 | File::Compare::compare_text does a line by line comparison of the two |
145 | files. It stops as soon as a difference is detected. |
146 | |
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147 | =head1 RETURN |
148 | |
149 | File::Compare::compare return 0 if the files are equal, 1 if the |
150 | files are unequal, or -1 if an error was encountered. |
151 | |
152 | =head1 AUTHOR |
153 | |
154 | File::Compare was written by Nick Ing-Simmons. |
155 | Its original documentation was written by Chip Salzenberg. |
156 | |
157 | =cut |
158 | |