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Support/ADT/Twine: Make toNullTerminatedStringRef not rely on UB :(.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120791 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael J. Spencer 2010-12-03 05:42:25 +00:00
parent b83769f36a
commit 0dda5437f8
1 changed files with 12 additions and 4 deletions
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16
lib/Support/Twine.cpp
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@ -31,10 +31,18 @@ StringRef Twine::toStringRef(SmallVectorImpl<char> &Out) const {
}
StringRef Twine::toNullTerminatedStringRef(SmallVectorImpl<char> &Out) const {
if (isSingleStringRef()) {
StringRef sr = getSingleStringRef();
if (*(sr.begin() + sr.size()) == 0)
return sr;
if (isUnary()) {
switch (getLHSKind()) {
case CStringKind:
// Already null terminated, yay!
return StringRef(static_cast<const char*>(LHS));
case StdStringKind: {
const std::string *str = static_cast<const std::string*>(LHS);
return StringRef(str->c_str(), str->size());
}
default:
break;
}
}
toVector(Out);
Out.push_back(0);