Commit | Line | Data |
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abf0a31f | 1 | package File::Compare 1.1008; |
5f05dabc | 2 | |
59f2a7f5 | 3 | use v5.12; |
b395063c | 4 | use warnings; |
5f05dabc | 5 | |
59f2a7f5 | 6 | use Exporter 'import'; |
5f05dabc | 7 | |
59f2a7f5 JR |
8 | our @EXPORT = qw(compare); |
9 | our @EXPORT_OK = qw(cmp compare_text); | |
5f05dabc | 10 | |
59f2a7f5 | 11 | our $Too_Big = 1024 * 1024 * 2; |
5f05dabc | 12 | |
8878f897 T |
13 | sub croak { |
14 | require Carp; | |
15 | goto &Carp::croak; | |
16 | } | |
17 | ||
5f05dabc | 18 | sub compare { |
19 | croak("Usage: compare( file1, file2 [, buffersize]) ") | |
20 | unless(@_ == 2 || @_ == 3); | |
21 | ||
abf0a31f | 22 | my ($from, $to, $size) = @_; |
167e09eb | 23 | my $text_mode = defined($size) && (ref($size) eq 'CODE' || $size < 0); |
3724d6f4 | 24 | |
abf0a31f | 25 | my ($fromsize, $closefrom, $closeto); |
3724d6f4 | 26 | local (*FROM, *TO); |
5f05dabc | 27 | |
28 | croak("from undefined") unless (defined $from); | |
29 | croak("to undefined") unless (defined $to); | |
30 | ||
d704f39a | 31 | if (ref($from) && |
abf0a31f | 32 | (UNIVERSAL::isa($from, 'GLOB') || UNIVERSAL::isa($from, 'IO::Handle'))) { |
5f05dabc | 33 | *FROM = *$from; |
34 | } elsif (ref(\$from) eq 'GLOB') { | |
35 | *FROM = $from; | |
36 | } else { | |
abf0a31f | 37 | open(FROM, '<', $from) or goto fail_open1; |
3724d6f4 JD |
38 | unless ($text_mode) { |
39 | binmode FROM; | |
40 | $fromsize = -s FROM; | |
41 | } | |
5f05dabc | 42 | $closefrom = 1; |
43 | } | |
44 | ||
d704f39a | 45 | if (ref($to) && |
abf0a31f | 46 | (UNIVERSAL::isa($to, 'GLOB') || UNIVERSAL::isa($to, 'IO::Handle'))) { |
5f05dabc | 47 | *TO = *$to; |
48 | } elsif (ref(\$to) eq 'GLOB') { | |
49 | *TO = $to; | |
50 | } else { | |
abf0a31f | 51 | open(TO, '<', $to) or goto fail_open2; |
3724d6f4 | 52 | binmode TO unless $text_mode; |
5f05dabc | 53 | $closeto = 1; |
54 | } | |
55 | ||
3724d6f4 | 56 | if (!$text_mode && $closefrom && $closeto) { |
387d8d95 CS |
57 | # If both are opened files we know they differ if their size differ |
58 | goto fail_inner if $fromsize != -s TO; | |
59 | } | |
60 | ||
3724d6f4 JD |
61 | if ($text_mode) { |
62 | local $/ = "\n"; | |
abf0a31f | 63 | my ($fline, $tline); |
3724d6f4 | 64 | while (defined($fline = <FROM>)) { |
167e09eb JD |
65 | goto fail_inner unless defined($tline = <TO>); |
66 | if (ref $size) { | |
67 | # $size contains ref to comparison function | |
68 | goto fail_inner if &$size($fline, $tline); | |
69 | } else { | |
70 | goto fail_inner if $fline ne $tline; | |
3724d6f4 JD |
71 | } |
72 | } | |
73 | goto fail_inner if defined($tline = <TO>); | |
5f05dabc | 74 | } |
3724d6f4 JD |
75 | else { |
76 | unless (defined($size) && $size > 0) { | |
5c99b74d | 77 | $size = $fromsize || -s TO || 0; |
3724d6f4 JD |
78 | $size = 1024 if $size < 512; |
79 | $size = $Too_Big if $size > $Too_Big; | |
80 | } | |
5f05dabc | 81 | |
abf0a31f | 82 | my ($fr, $tr, $fbuf, $tbuf); |
3724d6f4 | 83 | $fbuf = $tbuf = ''; |
abf0a31f EA |
84 | while(defined($fr = read(FROM, $fbuf, $size)) && $fr > 0) { |
85 | unless (defined($tr = read(TO, $tbuf, $fr)) && $tbuf eq $fbuf) { | |
3724d6f4 JD |
86 | goto fail_inner; |
87 | } | |
5f05dabc | 88 | } |
abf0a31f | 89 | goto fail_inner if defined($tr = read(TO, $tbuf, $size)) && $tr > 0; |
5f05dabc | 90 | } |
5f05dabc | 91 | |
92 | close(TO) || goto fail_open2 if $closeto; | |
93 | close(FROM) || goto fail_open1 if $closefrom; | |
94 | ||
95 | return 0; | |
96 | ||
97 | # All of these contortions try to preserve error messages... | |
98 | fail_inner: | |
99 | close(TO) || goto fail_open2 if $closeto; | |
100 | close(FROM) || goto fail_open1 if $closefrom; | |
101 | ||
102 | return 1; | |
103 | ||
104 | fail_open2: | |
105 | if ($closefrom) { | |
3724d6f4 | 106 | my $status = $!; |
5f05dabc | 107 | $! = 0; |
108 | close FROM; | |
109 | $! = $status unless $!; | |
110 | } | |
111 | fail_open1: | |
112 | return -1; | |
113 | } | |
114 | ||
17f410f9 | 115 | sub cmp; |
5f05dabc | 116 | *cmp = \&compare; |
117 | ||
167e09eb | 118 | sub compare_text { |
abf0a31f | 119 | my ($from, $to, $cmp) = @_; |
167e09eb JD |
120 | croak("Usage: compare_text( file1, file2 [, cmp-function])") |
121 | unless @_ == 2 || @_ == 3; | |
122 | croak("Third arg to compare_text() function must be a code reference") | |
123 | if @_ == 3 && ref($cmp) ne 'CODE'; | |
124 | ||
125 | # Using a negative buffer size puts compare into text_mode too | |
59f2a7f5 | 126 | compare($from, $to, $cmp // -1); |
167e09eb | 127 | } |
3724d6f4 | 128 | |
5f05dabc | 129 | 1; |
130 | ||
131 | __END__ | |
132 | ||
133 | =head1 NAME | |
134 | ||
135 | File::Compare - Compare files or filehandles | |
136 | ||
137 | =head1 SYNOPSIS | |
138 | ||
139 | use File::Compare; | |
140 | ||
abf0a31f | 141 | if (compare("file1", "file2") == 0) { |
5f05dabc | 142 | print "They're equal\n"; |
143 | } | |
144 | ||
145 | =head1 DESCRIPTION | |
146 | ||
abf0a31f | 147 | The C<File::Compare::compare> function compares the contents of two |
5f05dabc | 148 | sources, each of which can be a file or a file handle. It is exported |
abf0a31f | 149 | from C<File::Compare> by default. |
5f05dabc | 150 | |
abf0a31f EA |
151 | C<File::Compare::cmp> is a synonym for C<File::Compare::compare>. It is |
152 | exported from C<File::Compare> only by request. | |
5f05dabc | 153 | |
abf0a31f EA |
154 | C<File::Compare::compare_text> does a line by line comparison of the two |
155 | files. It stops as soon as a difference is detected. C<compare_text()> | |
167e09eb | 156 | accepts an optional third argument: This must be a CODE reference to |
abf0a31f | 157 | a line comparison function, which returns C<0> when both lines are considered |
167e09eb JD |
158 | equal. For example: |
159 | ||
160 | compare_text($file1, $file2) | |
161 | ||
162 | is basically equivalent to | |
163 | ||
164 | compare_text($file1, $file2, sub {$_[0] ne $_[1]} ) | |
3724d6f4 | 165 | |
5f05dabc | 166 | =head1 RETURN |
167 | ||
abf0a31f EA |
168 | C<File::Compare::compare> and its sibling functions return C<0> if the files |
169 | are equal, C<1> if the files are unequal, or C<-1> if an error was encountered. | |
5f05dabc | 170 | |
171 | =head1 AUTHOR | |
172 | ||
abf0a31f | 173 | C<File::Compare> was written by Nick Ing-Simmons. |
5f05dabc | 174 | Its original documentation was written by Chip Salzenberg. |