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3

Note that strtok modifes the string you're checking, so you can't use it on const char * strings without making a copy.
– Graeme Perrow
Commented Sep 10, 2008 at 13:53
9

The multithreading issue is that strtok uses a global variable to keep track of where it is, so if you have two threads that each use strtok, you'll get undefined behavior.
– JohnMcG
Commented Sep 10, 2008 at 15:09
@JohnMcG Or just use strtok_s which is basically strtok with explicit state passing.
– Matthias
Commented Jun 2, 2018 at 16:51

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