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Does memcpy return anything?
In the C Programming Language, the memcpy function copies n characters from the object pointed to by s2 into the object pointed to by s1. It returns a pointer to the destination. The memcpy function may not work if the objects overlap.
How can I improve my memcpy?
With a cold cache, optimized memcpy with write-back cache works best because the cache doesn’t have to write to memory and so avoids any delays on the bus. For a garbage-filled cache, write-through caches work slightly better, because the cache doesn’t need to spend extra cycles evicting irrelevant data to memory.
Does memcpy null terminate?
> strcpy() other than the strcpy() is null terminated by default. memcpy() takes destination, source and number of characters to copy. Null termination is irrelevant to it. Number of characters is irrelevant to it.
How does the internal implementation of memcpy work?
The implementation of memcpy is highly specific to the system in which it is implemented. Implementations are often hardware-assisted. Memory-to-memory mov instructions are not that uncommon – they have been around since at least PDP-11 times, when you could write something like this:
How is the memcpy function used in typecasting?
The memcpy function is used to copy a block of data from a source address to a destination address. Below is its prototype. The idea is to simply typecast given addresses to char * (char takes 1 byte). Then one by one copy data from source to destination.
How is the behavior of the memcpy function undefined?
The memcpy function copies n characters from the source object to the destination object. If the source and destination objects overlap, the behavior of memcpy is undefined. In memcpy, we need to pass the address of source and destination buffer and the number of bytes (n) which you want to copy.
Is it possible to avoid a double copy of memcpy?
Double copies should be avoided unless if it is really impossible. In this case though it is easily possible to avoid double copies by picking a direction of copy. In fact this is what the memmove () library function does. By comparing the src and the dst addresses you should be able to find if they overlap.