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Fix crash comparing empty file against nonempty file.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19782 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -93,7 +93,8 @@ static bool CompareNumbers(char *&F1P, char *&F2P, char *F1End, char *F2End,
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// with a number. Because of this, if needed, we pad the file so that it starts
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// and ends with a null character.
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static void PadFileIfNeeded(char *&FileStart, char *&FileEnd, char *&FP) {
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if (isNumberChar(FileStart[0]) || isNumberChar(FileEnd[-1])) {
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if (FileStart-FileEnd < 2 ||
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isNumberChar(FileStart[0]) || isNumberChar(FileEnd[-1])) {
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unsigned FileLen = FileEnd-FileStart;
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char *NewFile = new char[FileLen+2];
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NewFile[0] = 0; // Add null padding
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