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 _fstrspn()              Find First Substring (Model Independent)

 #include   <string.h>

 size_t _fstrspn(string1, string2);
 char _far *string1;            String to search
 char _far *string2;            String of characters to search for

    This is the model independent version of strspn(); it returns the
    index of the first character in string1 that does not occur in
    string2. See strspn() for more information.

    Returns:    A pointer to the first occurance of a character in
                  string1 that does not occur in string1.

 Portability:   Not supported by the ANSI standard.