+warn "Legacy library @{[(caller(0))[6]]} will be removed from the Perl core distribution in the next major release. Please install it from the CPAN distribution Perl4::CoreLibs. It is being used at @{[(caller)[1]]}, line @{[(caller)[2]]}.\n";
+
package bigfloat;
require "bigint.pl";
+#
+# This library is no longer being maintained, and is included for backward
+# compatibility with Perl 4 programs which may require it.
+# This legacy library is deprecated and will be removed in a future
+# release of perl.
+#
+# In particular, this should not be used as an example of modern Perl
+# programming techniques.
+#
+# Suggested alternative: Math::BigFloat
# Arbitrary length float math package
#
+# by Mark Biggar
+#
# number format
# canonical strings have the form /[+-]\d+E[+-]\d+/
-# Input values can have inbedded whitespace
+# Input values can have embedded whitespace
# Error returns
# 'NaN' An input parameter was "Not a Number" or
# divide by zero or sqrt of negative number
# Division is computed to
-# max($div_scale,length(dividend).length(divisor))
+# max($div_scale,length(dividend)+length(divisor))
# digits by default.
# Also used for default sqrt scale
sub main'fnorm { #(string) return fnum_str
local($_) = @_;
s/\s+//g; # strip white space
- if (/^([+-]?)(\d*)(\.(\d*))?([Ee]([+-]?\d+))?$/ && "$2$4" ne '') {
- &norm(($1 ? "$1$2$4" : "+$2$4"),(($4 ne '') ? $6-length($4) : $6));
+ if (/^([+-]?)(\d*)(\.(\d*))?([Ee]([+-]?\d+))?$/
+ && ($2 ne '' || defined($4))) {
+ my $x = defined($4) ? $4 : '';
+ &norm(($1 ? "$1$2$x" : "+$2$x"), (($x ne '') ? $6-length($x) : $6));
} else {
'NaN';
}
# negation
sub main'fneg { #(fnum_str) return fnum_str
local($_) = &'fnorm($_[0]);
- substr($_,0,1) =~ tr/+-/-+/ if ($_ ne '+0E+0'); # flip sign
+ vec($_,0,8) ^= ord('+') ^ ord('-') unless $_ eq '+0E+0'; # flip sign
+ if ( ord("\t") == 9 ) { # ascii
+ s/^H/N/;
+ }
+ else { # ebcdic character set
+ s/\373/N/;
+ }
$_;
}
# absolute value
sub main'fabs { #(fnum_str) return fnum_str
local($_) = &'fnorm($_[0]);
- substr($_,0,1) = '+'; # mash sign
+ s/^-/+/; # mash sign
$_;
}
$scale = length($xm)-1 if (length($xm)-1 > $scale);
$scale = length($ym)-1 if (length($ym)-1 > $scale);
$scale = $scale + length($ym) - length($xm);
- &norm(&round(&'bdiv($xm.('0' x $scale),$ym),$ym),
+ &norm(&round(&'bdiv($xm.('0' x $scale),$ym),&'babs($ym)),
$xe-$ye-$scale);
}
}
if ($xe < 1) {
'+0E+0';
} elsif ($xe == 1) {
- &norm(&round('+0',"+0".substr($xm,1,1),"+10"), $scale);
+ # The first substr preserves the sign, which means that
+ # we'll pass a non-normalized "-0" to &round when rounding
+ # -0.006 (for example), purely so that &round won't lose
+ # the sign.
+ &norm(&round(substr($xm,0,1).'0',
+ "+0".substr($xm,1,1),"+10"), $scale);
} else {
- &norm(&round(substr($xm,0,$trunc),
- "+0".substr($xm,$trunc,1),"+10"), $scale);
+ &norm(&round(substr($xm,0,$xe),
+ "+0".substr($xm,$xe,1),"+10"), $scale);
}
}
}
local($x, $y) = (&'fnorm($_[0]),&'fnorm($_[1]));
if ($x eq "NaN" || $y eq "NaN") {
undef;
- } elsif ($x eq $y) {
- 0;
- } elsif (ord($x) != ord($y)) {
- (ord($y) - ord($x)); # based on signs
} else {
- local($xm,$xe) = split('E',$x);
- local($ym,$ye) = split('E',$y);
- if ($xe ne $ye) {
- ($xe - $ye) * (substr($x,0,1).'1');
- } else {
- &bigint'cmp($xm,$ym); # based on value
- }
+ ord($y) <=> ord($x)
+ ||
+ ( local($xm,$xe,$ym,$ye) = split('E', $x."E$y"),
+ (($xe <=> $ye) * (substr($x,0,1).'1')
+ || &bigint'cmp($xm,$ym))
+ );
}
}
\f