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|
package FileHandle;
# Note that some additional FileHandle methods are defined in POSIX.pm.
require 5.000;
use English;
use Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(
print
autoflush
output_field_separator
output_record_separator
input_record_separator
input_line_number
format_page_number
format_lines_per_page
format_lines_left
format_name
format_top_name
format_line_break_characters
format_formfeed
cacheout
);
sub print {
local($this) = shift;
print $this @_;
}
sub autoflush {
local($old) = select($_[0]);
local($prev) = $OUTPUT_AUTOFLUSH;
$OUTPUT_AUTOFLUSH = @_ > 1 ? $_[1] : 1;
select($old);
$prev;
}
sub output_field_separator {
local($old) = select($_[0]);
local($prev) = $OUTPUT_FIELD_SEPARATOR;
$OUTPUT_FIELD_SEPARATOR = $_[1] if @_ > 1;
select($old);
$prev;
}
sub output_record_separator {
local($old) = select($_[0]);
local($prev) = $OUTPUT_RECORD_SEPARATOR;
$OUTPUT_RECORD_SEPARATOR = $_[1] if @_ > 1;
select($old);
$prev;
}
sub input_record_separator {
local($old) = select($_[0]);
local($prev) = $INPUT_RECORD_SEPARATOR;
$INPUT_RECORD_SEPARATOR = $_[1] if @_ > 1;
select($old);
$prev;
}
sub input_line_number {
local($old) = select($_[0]);
local($prev) = $INPUT_LINE_NUMBER;
$INPUT_LINE_NUMBER = $_[1] if @_ > 1;
select($old);
$prev;
}
sub format_page_number {
local($old) = select($_[0]);
local($prev) = $FORMAT_PAGE_NUMBER;
$FORMAT_PAGE_NUMBER = $_[1] if @_ > 1;
select($old);
$prev;
}
sub format_lines_per_page {
local($old) = select($_[0]);
local($prev) = $FORMAT_LINES_PER_PAGE;
$FORMAT_LINES_PER_PAGE = $_[1] if @_ > 1;
select($old);
$prev;
}
sub format_lines_left {
local($old) = select($_[0]);
local($prev) = $FORMAT_LINES_LEFT;
$FORMAT_LINES_LEFT = $_[1] if @_ > 1;
select($old);
$prev;
}
sub format_name {
local($old) = select($_[0]);
local($prev) = $FORMAT_NAME;
$FORMAT_NAME = $_[1] if @_ > 1;
select($old);
$prev;
}
sub format_top_name {
local($old) = select($_[0]);
local($prev) = $FORMAT_TOP_NAME;
$FORMAT_TOP_NAME = $_[1] if @_ > 1;
select($old);
$prev;
}
sub format_line_break_characters {
local($old) = select($_[0]);
local($prev) = $FORMAT_LINE_BREAK_CHARACTERS;
$FORMAT_LINE_BREAK_CHARACTERS = $_[1] if @_ > 1;
select($old);
$prev;
}
sub format_formfeed {
local($old) = select($_[0]);
local($prev) = $FORMAT_FORMFEED;
$FORMAT_FORMFEED = $_[1] if @_ > 1;
select($old);
$prev;
}
# --- cacheout functions ---
# Open in their package.
sub cacheout_open {
my $pack = caller(1);
open(*{$pack . '::' . $_[0]}, $_[1]);
}
sub cacheout_close {
my $pack = caller(1);
close(*{$pack . '::' . $_[0]});
}
# But only this sub name is visible to them.
sub cacheout {
($file) = @_;
if (!$cacheout_maxopen){
if (open(PARAM,'/usr/include/sys/param.h')) {
local($.);
while (<PARAM>) {
$cacheout_maxopen = $1 - 4
if /^\s*#\s*define\s+NOFILE\s+(\d+)/;
}
close PARAM;
}
$cacheout_maxopen = 16 unless $cacheout_maxopen;
}
if (!$isopen{$file}) {
if (++$cacheout_numopen > $cacheout_maxopen) {
local(@lru) = sort {$isopen{$a} <=> $isopen{$b};} keys(%isopen);
splice(@lru, $cacheout_maxopen / 3);
$cacheout_numopen -= @lru;
for (@lru) { &cacheout_close($_); delete $isopen{$_}; }
}
&cacheout_open($file, ($saw{$file}++ ? '>>' : '>') . $file)
|| croak("Can't create $file: $!");
}
$isopen{$file} = ++$cacheout_seq;
}
$cacheout_seq = 0;
$cacheout_numopen = 0;
1;
|
