Using strtok() in nested loops in C?

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Yes, strtok(), indeed, uses some static memory to save its context between invocations. Use a reentrant version of strtok(), strtok_r() instead, or strtok_s() if you are using VS (identical to strtok_r()).

It has an additional context argument, and you can use different contexts in different loops.

char *tok, *saved;
for (tok = strtok_r(str, "%", &saved); tok; tok = strtok_r(NULL, "%", &saved))
{
    /* Do something with "tok" */
}

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