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fpcmp: Fix a possible infinite loop when comparing something like: 

1..19 ok
to
  1..20 o k
(yes, the odd space is necessary).

llvm-svn: 106032
This commit is contained in:
Daniel Dunbar 2010-06-15 19:20:28 +00:00
parent 874c92bd47
commit b645fa13a9
1 changed files with 8 additions and 0 deletions
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8
llvm/lib/Support/FileUtilities.cpp
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@ -51,7 +51,15 @@ static const char *BackupNumber(const char *Pos, const char *FirstChar) {
if (!isNumberChar(*Pos)) return Pos; if (!isNumberChar(*Pos)) return Pos;
// Otherwise, return to the start of the number. // Otherwise, return to the start of the number.
bool HasPeriod = false;
while (Pos > FirstChar && isNumberChar(Pos[-1])) { while (Pos > FirstChar && isNumberChar(Pos[-1])) {
// Backup over at most one period.
if (Pos[-1] == '.') {
if (HasPeriod)
break;
HasPeriod = true;
}
--Pos; --Pos;
if (Pos > FirstChar && isSignedChar(Pos[0]) && !isExponentChar(Pos[-1])) if (Pos > FirstChar && isSignedChar(Pos[0]) && !isExponentChar(Pos[-1]))
break; break;