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1 | # |
2 | |
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3 | package IO::File; |
4 | |
5 | =head1 NAME |
6 | |
7 | IO::File - supply object methods for filehandles |
8 | |
9 | =head1 SYNOPSIS |
10 | |
11 | use IO::File; |
12 | |
13 | $fh = new IO::File; |
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14 | if ($fh->open("< file")) { |
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15 | print <$fh>; |
16 | $fh->close; |
17 | } |
18 | |
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19 | $fh = new IO::File "> file"; |
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20 | if (defined $fh) { |
21 | print $fh "bar\n"; |
22 | $fh->close; |
23 | } |
24 | |
25 | $fh = new IO::File "file", "r"; |
26 | if (defined $fh) { |
27 | print <$fh>; |
28 | undef $fh; # automatically closes the file |
29 | } |
30 | |
31 | $fh = new IO::File "file", O_WRONLY|O_APPEND; |
32 | if (defined $fh) { |
33 | print $fh "corge\n"; |
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34 | |
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35 | $pos = $fh->getpos; |
36 | $fh->setpos($pos); |
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37 | |
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38 | undef $fh; # automatically closes the file |
39 | } |
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40 | |
41 | autoflush STDOUT 1; |
42 | |
43 | =head1 DESCRIPTION |
44 | |
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45 | C<IO::File> inherits from C<IO::Handle> and C<IO::Seekable>. It extends |
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46 | these classes with methods that are specific to file handles. |
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47 | |
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48 | =head1 CONSTRUCTOR |
49 | |
50 | =over 4 |
51 | |
52 | =item new ([ ARGS ] ) |
53 | |
54 | Creates a C<IO::File>. If it receives any parameters, they are passed to |
55 | the method C<open>; if the open fails, the object is destroyed. Otherwise, |
56 | it is returned to the caller. |
57 | |
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58 | =item new_tmpfile |
59 | |
60 | Creates an C<IO::File> opened for read/write on a newly created temporary |
61 | file. On systems where this is possible, the temporary file is anonymous |
62 | (i.e. it is unlinked after creation, but held open). If the temporary |
63 | file cannot be created or opened, the C<IO::File> object is destroyed. |
64 | Otherwise, it is returned to the caller. |
65 | |
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66 | =back |
67 | |
68 | =head1 METHODS |
69 | |
70 | =over 4 |
71 | |
72 | =item open( FILENAME [,MODE [,PERMS]] ) |
73 | |
74 | C<open> accepts one, two or three parameters. With one parameter, |
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75 | it is just a front end for the built-in C<open> function. With two |
76 | parameters, the first parameter is a filename that may include |
77 | whitespace or other special characters, and the second parameter is |
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78 | the open mode, optionally followed by a file permission value. |
79 | |
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80 | If C<IO::File::open> receives a Perl mode string ("E<gt>", "+E<lt>", etc.) |
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81 | or a POSIX fopen() mode string ("w", "r+", etc.), it uses the basic |
82 | Perl C<open> operator. |
83 | |
84 | If C<IO::File::open> is given a numeric mode, it passes that mode |
85 | and the optional permissions value to the Perl C<sysopen> operator. |
86 | For convenience, C<IO::File::import> tries to import the O_XXX |
87 | constants from the Fcntl module. If dynamic loading is not available, |
88 | this may fail, but the rest of IO::File will still work. |
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89 | |
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90 | =back |
91 | |
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92 | =head1 SEE ALSO |
93 | |
94 | L<perlfunc>, |
95 | L<perlop/"I/O Operators">, |
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96 | L<IO::Handle> |
97 | L<IO::Seekable> |
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98 | |
99 | =head1 HISTORY |
100 | |
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101 | Derived from FileHandle.pm by Graham Barr E<lt>F<bodg@tiuk.ti.com>E<gt>. |
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102 | |
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103 | =cut |
104 | |
105 | require 5.000; |
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106 | use strict; |
107 | use vars qw($VERSION @EXPORT @EXPORT_OK $AUTOLOAD @ISA); |
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108 | use Carp; |
109 | use Symbol; |
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110 | use SelectSaver; |
111 | use IO::Handle qw(_open_mode_string); |
112 | use IO::Seekable; |
113 | |
114 | require Exporter; |
115 | require DynaLoader; |
116 | |
117 | @ISA = qw(IO::Handle IO::Seekable Exporter DynaLoader); |
118 | |
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119 | $VERSION = "1.06"; |
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120 | |
121 | @EXPORT = @IO::Seekable::EXPORT; |
122 | |
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123 | sub import { |
124 | my $pkg = shift; |
125 | my $callpkg = caller; |
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126 | Exporter::export $pkg, $callpkg, @_; |
127 | |
128 | # |
129 | # If the Fcntl extension is available, |
130 | # export its constants for sysopen(). |
131 | # |
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132 | eval { |
133 | require Fcntl; |
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134 | Exporter::export 'Fcntl', $callpkg, '/^O_/'; |
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135 | }; |
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136 | } |
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137 | |
138 | |
139 | ################################################ |
140 | ## Constructor |
141 | ## |
142 | |
143 | sub new { |
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144 | my $type = shift; |
145 | my $class = ref($type) || $type || "IO::File"; |
146 | @_ >= 0 && @_ <= 3 |
147 | or croak "usage: new $class [FILENAME [,MODE [,PERMS]]]"; |
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148 | my $fh = $class->SUPER::new(); |
149 | if (@_) { |
150 | $fh->open(@_) |
151 | or return undef; |
152 | } |
153 | $fh; |
154 | } |
155 | |
156 | ################################################ |
157 | ## Open |
158 | ## |
159 | |
160 | sub open { |
161 | @_ >= 2 && @_ <= 4 or croak 'usage: $fh->open(FILENAME [,MODE [,PERMS]])'; |
162 | my ($fh, $file) = @_; |
163 | if (@_ > 2) { |
164 | my ($mode, $perms) = @_[2, 3]; |
165 | if ($mode =~ /^\d+$/) { |
166 | defined $perms or $perms = 0666; |
167 | return sysopen($fh, $file, $mode, $perms); |
168 | } |
169 | $file = "./" . $file unless $file =~ m#^/#; |
170 | $file = _open_mode_string($mode) . " $file\0"; |
171 | } |
172 | open($fh, $file); |
173 | } |
174 | |
175 | 1; |