Commit | Line | Data |
---|---|---|
7a4c00b4 | 1 | # |
2 | ||
8add82fc | 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 | ||
80f9dd66 | 13 | my $fh = IO::File->new(); |
774d564b | 14 | if ($fh->open("< file")) { |
8add82fc | 15 | print <$fh>; |
16 | $fh->close; | |
17 | } | |
18 | ||
80f9dd66 | 19 | my $fh = IO::File->new("> file"); |
8add82fc | 20 | if (defined $fh) { |
21 | print $fh "bar\n"; | |
22 | $fh->close; | |
23 | } | |
24 | ||
80f9dd66 | 25 | my $fh = IO::File->new("file", "r"); |
8add82fc | 26 | if (defined $fh) { |
27 | print <$fh>; | |
28 | undef $fh; # automatically closes the file | |
29 | } | |
30 | ||
80f9dd66 | 31 | my $fh = IO::File->new("file", O_WRONLY|O_APPEND); |
8add82fc | 32 | if (defined $fh) { |
33 | print $fh "corge\n"; | |
8add82fc | 34 | |
80f9dd66 | 35 | my $pos = $fh->getpos; |
774d564b | 36 | $fh->setpos($pos); |
8add82fc | 37 | |
774d564b | 38 | undef $fh; # automatically closes the file |
39 | } | |
8add82fc | 40 | |
41 | autoflush STDOUT 1; | |
42 | ||
43 | =head1 DESCRIPTION | |
44 | ||
55497cff | 45 | C<IO::File> inherits from C<IO::Handle> and C<IO::Seekable>. It extends |
27d4819a | 46 | these classes with methods that are specific to file handles. |
8add82fc | 47 | |
27d4819a JM |
48 | =head1 CONSTRUCTOR |
49 | ||
50 | =over 4 | |
51 | ||
cf7fe8a2 | 52 | =item new ( FILENAME [,MODE [,PERMS]] ) |
27d4819a | 53 | |
d1be9408 | 54 | Creates an C<IO::File>. If it receives any parameters, they are passed to |
27d4819a JM |
55 | the method C<open>; if the open fails, the object is destroyed. Otherwise, |
56 | it is returned to the caller. | |
57 | ||
9f01644e CS |
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 | ||
27d4819a JM |
66 | =back |
67 | ||
68 | =head1 METHODS | |
69 | ||
70 | =over 4 | |
71 | ||
72 | =item open( FILENAME [,MODE [,PERMS]] ) | |
73 | ||
73829507 PH |
74 | =item open( FILENAME, IOLAYERS ) |
75 | ||
27d4819a | 76 | C<open> accepts one, two or three parameters. With one parameter, |
cf7fe8a2 | 77 | it is just a front end for the built-in C<open> function. With two or three |
8add82fc | 78 | parameters, the first parameter is a filename that may include |
79 | whitespace or other special characters, and the second parameter is | |
223d223e | 80 | the open mode, optionally followed by a file permission value. |
81 | ||
27d4819a | 82 | If C<IO::File::open> receives a Perl mode string ("E<gt>", "+E<lt>", etc.) |
d1be9408 | 83 | or an ANSI C fopen() mode string ("w", "r+", etc.), it uses the basic |
cf7fe8a2 | 84 | Perl C<open> operator (but protects any special characters). |
223d223e | 85 | |
86 | If C<IO::File::open> is given a numeric mode, it passes that mode | |
87 | and the optional permissions value to the Perl C<sysopen> operator. | |
cf7fe8a2 GS |
88 | The permissions default to 0666. |
89 | ||
73829507 PH |
90 | If C<IO::File::open> is given a mode that includes the C<:> character, |
91 | it passes all the three arguments to the three-argument C<open> operator. | |
92 | ||
cf7fe8a2 GS |
93 | For convenience, C<IO::File> exports the O_XXX constants from the |
94 | Fcntl module, if this module is available. | |
8add82fc | 95 | |
27d4819a JM |
96 | =back |
97 | ||
fd172bcd SP |
98 | =head1 NOTE |
99 | ||
100 | Some operating systems may perform C<IO::File::new()> or C<IO::File::open()> | |
101 | on a directory without errors. This behavior is not portable and not | |
102 | suggested for use. Using C<opendir()> and C<readdir()> or C<IO::Dir> are | |
103 | suggested instead. | |
104 | ||
8add82fc | 105 | =head1 SEE ALSO |
106 | ||
107 | L<perlfunc>, | |
108 | L<perlop/"I/O Operators">, | |
fd172bcd SP |
109 | L<IO::Handle>, |
110 | L<IO::Seekable>, | |
111 | L<IO::Dir> | |
8add82fc | 112 | |
113 | =head1 HISTORY | |
114 | ||
cf7fe8a2 | 115 | Derived from FileHandle.pm by Graham Barr E<lt>F<gbarr@pobox.com>E<gt>. |
8add82fc | 116 | |
8add82fc | 117 | =cut |
118 | ||
07f4731b | 119 | use 5.008_001; |
7a4c00b4 | 120 | use strict; |
8add82fc | 121 | use Carp; |
122 | use Symbol; | |
8add82fc | 123 | use SelectSaver; |
8add82fc | 124 | use IO::Seekable; |
125 | ||
126 | require Exporter; | |
8add82fc | 127 | |
07f4731b | 128 | our @ISA = qw(IO::Handle IO::Seekable Exporter); |
8add82fc | 129 | |
67fb9414 | 130 | our $VERSION = "1.55"; |
8add82fc | 131 | |
07f4731b | 132 | our @EXPORT = @IO::Seekable::EXPORT; |
8add82fc | 133 | |
cb628fe9 GA |
134 | eval { |
135 | # Make all Fcntl O_XXX constants available for importing | |
136 | require Fcntl; | |
137 | my @O = grep /^O_/, @Fcntl::EXPORT; | |
138 | Fcntl->import(@O); # first we import what we want to export | |
139 | push(@EXPORT, @O); | |
140 | }; | |
8add82fc | 141 | |
8add82fc | 142 | ################################################ |
143 | ## Constructor | |
144 | ## | |
145 | ||
146 | sub new { | |
27d4819a JM |
147 | my $type = shift; |
148 | my $class = ref($type) || $type || "IO::File"; | |
149 | @_ >= 0 && @_ <= 3 | |
f00d3350 | 150 | or croak "usage: $class->new([FILENAME [,MODE [,PERMS]]])"; |
8add82fc | 151 | my $fh = $class->SUPER::new(); |
152 | if (@_) { | |
153 | $fh->open(@_) | |
154 | or return undef; | |
155 | } | |
156 | $fh; | |
157 | } | |
158 | ||
159 | ################################################ | |
160 | ## Open | |
161 | ## | |
162 | ||
163 | sub open { | |
164 | @_ >= 2 && @_ <= 4 or croak 'usage: $fh->open(FILENAME [,MODE [,PERMS]])'; | |
165 | my ($fh, $file) = @_; | |
166 | if (@_ > 2) { | |
167 | my ($mode, $perms) = @_[2, 3]; | |
168 | if ($mode =~ /^\d+$/) { | |
169 | defined $perms or $perms = 0666; | |
170 | return sysopen($fh, $file, $mode, $perms); | |
73829507 PH |
171 | } elsif ($mode =~ /:/) { |
172 | return open($fh, $mode, $file) if @_ == 3; | |
173 | croak 'usage: $fh->open(FILENAME, IOLAYERS)'; | |
74af07f2 GA |
174 | } else { |
175 | return open($fh, IO::Handle::_open_mode_string($mode), $file); | |
176 | } | |
8add82fc | 177 | } |
178 | open($fh, $file); | |
179 | } | |
180 | ||
181 | 1; |