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     The strtok function reads <string1> as a series of zero or more
     tokens and <string2> as the set of characters serving as
     delimiters of the tokens in <string1>. The tokens in <string1> may
     be separated by one or more of the delimiters from <string2>.
 
     The tokens are broken out of <string1> by a series of calls to
     strtok. In the first call to strtok for <string1>, strtok searches
     for the first token in <string1>, skipping leading delimiters. A
     pointer to the first token is returned.
 
     To read the next token from <string1>, call strtok with a NULL
     value for the <string1> argument. The NULL <string1> argument
     causes strtok to search for the next token in the previous token
     string. The set of delimiters may vary from call to call, so
     <string2> can take any value.
 
     Note that calls to strtok modify <string1>, since strtok inserts a
     null character (\0) after the token in <string1> each time it is
     called.
 
     The _fstrtok function is a model-independent (large-model) form
     that uses far pointer forms of the string arguments and return
     values. This model-independent function can be called from any
     point in the program.
 
     Return Value
 
     The first time strtok is called, it returns a pointer to the first
     token in <string1>. In later calls with the same token string,
     strtok returns a pointer to the next token in the string. A NULL
     pointer is returned when there are no more tokens. All tokens are
     null terminated.
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