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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 | |
58 | =back |
59 | |
60 | =head1 METHODS |
61 | |
62 | =over 4 |
63 | |
64 | =item open( FILENAME [,MODE [,PERMS]] ) |
65 | |
66 | C<open> accepts one, two or three parameters. With one parameter, |
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67 | it is just a front end for the built-in C<open> function. With two |
68 | parameters, the first parameter is a filename that may include |
69 | whitespace or other special characters, and the second parameter is |
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70 | the open mode, optionally followed by a file permission value. |
71 | |
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72 | If C<IO::File::open> receives a Perl mode string ("E<gt>", "+E<lt>", etc.) |
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73 | or a POSIX fopen() mode string ("w", "r+", etc.), it uses the basic |
74 | Perl C<open> operator. |
75 | |
76 | If C<IO::File::open> is given a numeric mode, it passes that mode |
77 | and the optional permissions value to the Perl C<sysopen> operator. |
78 | For convenience, C<IO::File::import> tries to import the O_XXX |
79 | constants from the Fcntl module. If dynamic loading is not available, |
80 | this may fail, but the rest of IO::File will still work. |
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81 | |
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82 | =back |
83 | |
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84 | =head1 SEE ALSO |
85 | |
86 | L<perlfunc>, |
87 | L<perlop/"I/O Operators">, |
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88 | L<IO::Handle> |
89 | L<IO::Seekable> |
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90 | |
91 | =head1 HISTORY |
92 | |
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93 | Derived from FileHandle.pm by Graham Barr E<lt>F<bodg@tiuk.ti.com>E<gt>. |
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94 | |
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95 | =cut |
96 | |
97 | require 5.000; |
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98 | use strict; |
99 | use vars qw($VERSION @EXPORT @EXPORT_OK $AUTOLOAD @ISA); |
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100 | use Carp; |
101 | use Symbol; |
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102 | use SelectSaver; |
103 | use IO::Handle qw(_open_mode_string); |
104 | use IO::Seekable; |
105 | |
106 | require Exporter; |
107 | require DynaLoader; |
108 | |
109 | @ISA = qw(IO::Handle IO::Seekable Exporter DynaLoader); |
110 | |
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111 | $VERSION = "1.06"; |
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112 | |
113 | @EXPORT = @IO::Seekable::EXPORT; |
114 | |
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115 | sub import { |
116 | my $pkg = shift; |
117 | my $callpkg = caller; |
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118 | Exporter::export $pkg, $callpkg, @_; |
119 | |
120 | # |
121 | # If the Fcntl extension is available, |
122 | # export its constants for sysopen(). |
123 | # |
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124 | eval { |
125 | require Fcntl; |
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126 | Exporter::export 'Fcntl', $callpkg, '/^O_/'; |
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127 | }; |
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128 | } |
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129 | |
130 | |
131 | ################################################ |
132 | ## Constructor |
133 | ## |
134 | |
135 | sub new { |
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136 | my $type = shift; |
137 | my $class = ref($type) || $type || "IO::File"; |
138 | @_ >= 0 && @_ <= 3 |
139 | or croak "usage: new $class [FILENAME [,MODE [,PERMS]]]"; |
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140 | my $fh = $class->SUPER::new(); |
141 | if (@_) { |
142 | $fh->open(@_) |
143 | or return undef; |
144 | } |
145 | $fh; |
146 | } |
147 | |
148 | ################################################ |
149 | ## Open |
150 | ## |
151 | |
152 | sub open { |
153 | @_ >= 2 && @_ <= 4 or croak 'usage: $fh->open(FILENAME [,MODE [,PERMS]])'; |
154 | my ($fh, $file) = @_; |
155 | if (@_ > 2) { |
156 | my ($mode, $perms) = @_[2, 3]; |
157 | if ($mode =~ /^\d+$/) { |
158 | defined $perms or $perms = 0666; |
159 | return sysopen($fh, $file, $mode, $perms); |
160 | } |
161 | $file = "./" . $file unless $file =~ m#^/#; |
162 | $file = _open_mode_string($mode) . " $file\0"; |
163 | } |
164 | open($fh, $file); |
165 | } |
166 | |
167 | 1; |