integrate cfgperl contents into mainline

[p5sagit/p5-mst-13.2.git] / lib / bigint.pl

diff --git a/lib/bigint.pl b/lib/bigint.pl
index a274736..4044f7f 100644 (file)
--- a/lib/bigint.pl
+++ b/lib/bigint.pl
@@ -1,5 +1,13 @@
 package bigint;
-
+#
+# This library is no longer being maintained, and is included for backward
+# compatibility with Perl 4 programs which may require it.
+#
+# In particular, this should not be used as an example of modern Perl
+# programming techniques.
+#
+# Suggested alternative:  Math::BigInt
+#
 # arbitrary size integer math package
 #
 # by Mark Biggar
@@ -74,7 +82,7 @@ sub external { #(int_num_array) return num_str
 sub main'bneg { #(num_str) return num_str
     local($_) = &'bnorm(@_);
     vec($_,0,8) ^= ord('+') ^ ord('-') unless $_ eq '+0';
-    s/^H/N/;
+    s/^./N/ unless /^[-+]/; # works both in ASCII and EBCDIC
     $_;
 }
 
@@ -168,11 +176,11 @@ sub add { #(int_num_array, int_num_array) return int_num_array
     $car = 0;
     for $x (@x) {
        last unless @y || $car;
-       $x -= 1e5 if $car = (($x += shift(@y) + $car) >= 1e5);
+       $x -= 1e5 if $car = (($x += shift(@y) + $car) >= 1e5) ? 1 : 0;
     }
     for $y (@y) {
        last unless $car;
-       $y -= 1e5 if $car = (($y += $car) >= 1e5);
+       $y -= 1e5 if $car = (($y += $car) >= 1e5) ? 1 : 0;
     }
     (@x, @y, $car);
 }