What's the difference between strtok_r and strtok_s in C?

Question

I\'m trying to use this function in a C program that needs to be able to compile in Linux and Windows. At first I tried using strtok_r, but then when I compiled on windows,

Answer 1

Just to clarify. strtok is thread safe in Windows. strtok uses a TLS variable to maintain the last pointer for each thread. However, you can not use strtok to interleave access to more than one token string per thread. strtok_r and strtok_s both address this interleaving problem by allowing the user to maintain the context via the third parameter. Hope this helps.