During StringToDouble negative exponents may be less than -999 with a result ...

test/cctest/test-conversions.cc

Index: test/cctest/test-conversions.cc
===================================================================
--- test/cctest/test-conversions.cc	(revision 5591)
+++ test/cctest/test-conversions.cc	(working copy)
@@ -168,7 +168,39 @@
   CHECK_EQ(gay_strtod(num, NULL), StringToDouble(num, NO_FLAGS));
 }
 
+TEST(MinimumExponent) {
+  // Same test but with different point-position.
+  char num[] =
+  "445014771701440202508199667279499186358524265859260511351695091"
+  "228726223124931264069530541271189424317838013700808305231545782"
+  "515453032382772695923684574304409936197089118747150815050941806"
+  "048037511737832041185193533879641611520514874130831632725201246"
+  "060231058690536206311752656217652146466431814205051640436322226"
+  "680064743260560117135282915796422274554896821334728738317548403"
+  "413978098469341510556195293821919814730032341053661708792231510"
+  "873354131880491105553390278848567812190177545006298062245710295"
+  "816371174594568773301103242116891776567137054973871082078224775"
+  "842509670618916870627821633352993761380751142008862499795052791"
+  "018709663463944015644907297315659352441231715398102212132212018"
+  "470035807616260163568645811358486831521563686919762403704226016"
+  "998291015625000000000000000000000000000000000e-1108";
 
+  CHECK_EQ(gay_strtod(num, NULL), StringToDouble(num, NO_FLAGS));
+
+  // Changes the result of strtod (at least in glibc implementation).
+  num[sizeof(num) - 8] = '1';
+
+  CHECK_EQ(gay_strtod(num, NULL), StringToDouble(num, NO_FLAGS));
+}
+
+
+TEST(MaximumExponent) {
+  char num[] = "0.16e309";
+
+  CHECK_EQ(gay_strtod(num, NULL), StringToDouble(num, NO_FLAGS));
+}
+
+
 TEST(ExponentNumberStr) {
   CHECK_EQ(1e1, StringToDouble("1e1", NO_FLAGS));
   CHECK_EQ(1e1, StringToDouble("1e+1", NO_FLAGS));