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[APFloat] Ensure that we can properly parse strings that do not have null terminators.

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rdar://14323230

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185397 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Gottesman
2013-07-01 23:54:08 +00:00
parent f801b8fe7a
commit b57770387a
2 changed files with 33 additions and 1 deletions
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9
lib/Support/APFloat.cpp
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@@ -2481,7 +2481,14 @@ APFloat::convertFromDecimalString(StringRef str, roundingMode rounding_mode)
42039/12655 < L < 28738/8651 [ numerator <= 65536 ]
*/
if (decDigitValue(*D.firstSigDigit) >= 10U) {
// Test if we have a zero number allowing for strings with no null terminators
// and zero decimals with non-zero exponents.
//
// We computed firstSigDigit by ignoring all zeros and dots. Thus if
// D->firstSigDigit equals str.end(), every digit must be a zero and there can
// be at most one dot. On the other hand, if we have a zero with a non-zero
// exponent, then we know that D.firstSigDigit will be non-numeric.
if (decDigitValue(*D.firstSigDigit) >= 10U || D.firstSigDigit == str.end()) {
category = fcZero;
fs = opOK;