Function realloc

library/cpp/balloc/balloc.cpp:234–258

static inline void* DoRealloc(void* oldPtr, size_t newSize) {
#else
extern "C" void* realloc(void* oldPtr, size_t newSize) {
#endif
    if (!oldPtr) {
        void* result = NBalloc::Malloc(newSize);
        return result;
    }
    if (newSize == 0) {
        NBalloc::Free(oldPtr);
        return nullptr;
    }
    void* newPtr = NBalloc::Malloc(newSize);
    if (!newPtr) {
        return nullptr;
    }
    NBalloc::TAllocHeader* header = (NBalloc::TAllocHeader*)oldPtr - 1;
    const size_t oldSize = header->AllocSize & ~NBalloc::SIGNATURE_MASK;
    const size_t signature = header->AllocSize & NBalloc::SIGNATURE_MASK;
    if (Y_LIKELY((signature == NBalloc::ALIVE_SIGNATURE) || (signature == NBalloc::DISABLED_SIGNATURE))) {
        memcpy(newPtr, oldPtr, oldSize < newSize ? oldSize : newSize);
        NBalloc::Free(oldPtr);
        return newPtr;
    }
    NMalloc::AbortFromCorruptedAllocator();
    return nullptr;
}

#if defined(Y_COVER_PTR)
extern "C" void* realloc(void* oldPtr, size_t newSize) {