fbstring IOBuf::moveToFbString() {
// malloc-allocated buffers are just fine, everything else needs
// to be turned into one.
if (!sharedInfo() || // user owned, not ours to give up
sharedInfo()->freeFn || // not malloc()-ed
headroom() != 0 || // malloc()-ed block doesn't start at beginning
tailroom() == 0 || // no room for NUL terminator
isShared() || // shared
isChained()) { // chained
// We might as well get rid of all head and tailroom if we're going
// to reallocate; we need 1 byte for NUL terminator.
coalesceAndReallocate(0, computeChainDataLength(), this, 1);
}
// Ensure NUL terminated
*writableTail() = 0;
fbstring str(reinterpret_cast<char*>(writableData()),
length(), capacity(),
AcquireMallocatedString());
if (flags() & kFlagFreeSharedInfo) {
delete sharedInfo();
}
// Reset to a state where we can be deleted cleanly
flagsAndSharedInfo_ = 0;
buf_ = nullptr;
clear();
return str;
}
fbstring demangle(const char* name) {
int status;
size_t len = 0;
// malloc() memory for the demangled type name
char* demangled = abi::__cxa_demangle(name, nullptr, &len, &status);
if (status != 0) {
return name;
}
// len is the length of the buffer (including NUL terminator and maybe
// other junk)
return fbstring(demangled, strlen(demangled), len, AcquireMallocatedString());
}