| Commit | Line | Data |
|---|
| 5f05dabc |
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 | |
| 10 | $VERSION = '1.1'; |
| 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 $closeto=0; |
| 30 | my ($size, $status, $fr, $tr, $fbuf, $tbuf); |
| 31 | local(*FROM, *TO); |
| 32 | local($\) = ''; |
| 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 | $closefrom = 1; |
| 45 | } |
| 46 | |
| 47 | if (ref($to) && (isa($to,'GLOB') || isa($to,'IO::Handle'))) { |
| 48 | *TO = *$to; |
| 49 | } elsif (ref(\$to) eq 'GLOB') { |
| 50 | *TO = $to; |
| 51 | } else { |
| 52 | open(TO,"<$to") or goto fail_open2; |
| 53 | binmode TO; |
| 54 | $closeto = 1; |
| 55 | } |
| 56 | |
| 57 | if (@_) { |
| 58 | $size = shift(@_) + 0; |
| 59 | croak("Bad buffer size for compare: $size\n") unless ($size > 0); |
| 60 | } else { |
| 61 | $size = -s FROM; |
| 62 | $size = 1024 if ($size < 512); |
| 63 | $size = $Too_Big if ($size > $Too_Big); |
| 64 | } |
| 65 | |
| 66 | $fbuf = ''; |
| 67 | $tbuf = ''; |
| 68 | while(defined($fr = read(FROM,$fbuf,$size)) && $fr > 0) { |
| 69 | unless (defined($tr = read(TO,$tbuf,$fr)) and $tbuf eq $fbuf) { |
| 70 | goto fail_inner; |
| 71 | } |
| 72 | } |
| 73 | goto fail_inner if (defined($tr = read(TO,$tbuf,$size)) && $tr > 0); |
| 74 | |
| 75 | close(TO) || goto fail_open2 if $closeto; |
| 76 | close(FROM) || goto fail_open1 if $closefrom; |
| 77 | |
| 78 | return 0; |
| 79 | |
| 80 | # All of these contortions try to preserve error messages... |
| 81 | fail_inner: |
| 82 | close(TO) || goto fail_open2 if $closeto; |
| 83 | close(FROM) || goto fail_open1 if $closefrom; |
| 84 | |
| 85 | return 1; |
| 86 | |
| 87 | fail_open2: |
| 88 | if ($closefrom) { |
| 89 | $status = $!; |
| 90 | $! = 0; |
| 91 | close FROM; |
| 92 | $! = $status unless $!; |
| 93 | } |
| 94 | fail_open1: |
| 95 | return -1; |
| 96 | } |
| 97 | |
| 98 | *cmp = \&compare; |
| 99 | |
| 100 | 1; |
| 101 | |
| 102 | __END__ |
| 103 | |
| 104 | =head1 NAME |
| 105 | |
| 106 | File::Compare - Compare files or filehandles |
| 107 | |
| 108 | =head1 SYNOPSIS |
| 109 | |
| 110 | use File::Compare; |
| 111 | |
| 112 | if (compare("file1","file2") == 0) { |
| 113 | print "They're equal\n"; |
| 114 | } |
| 115 | |
| 116 | =head1 DESCRIPTION |
| 117 | |
| 118 | The File::Compare::compare function compares the contents of two |
| 119 | sources, each of which can be a file or a file handle. It is exported |
| 120 | from File::Compare by default. |
| 121 | |
| 122 | File::Compare::cmp is a synonym for File::Compare::compare. It is |
| 123 | exported from File::Compare only by request. |
| 124 | |
| 125 | =head1 RETURN |
| 126 | |
| 127 | File::Compare::compare return 0 if the files are equal, 1 if the |
| 128 | files are unequal, or -1 if an error was encountered. |
| 129 | |
| 130 | =head1 AUTHOR |
| 131 | |
| 132 | File::Compare was written by Nick Ing-Simmons. |
| 133 | Its original documentation was written by Chip Salzenberg. |
| 134 | |
| 135 | =cut |
| 136 | |
projects / p5sagit/p5-mst-13.2.git / blame