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 _fstrcspn()             Scan One String for Another (Model Independent)

 #include   <string.h>

 size_t _fstrcspn(string1, string2);
 char _far *string1;                    Source string
 char _far *string2;                    Character set

    This is the model independent version of strcspn(); it returns the
    index of the first character in string1 that does not appear in
    string2. In other words, it finds the first substring in string1
    made up of characters not in the character set string2. See strcspn()
    for more information.

    Returns:    The index of the first character in string1 that
                belongs to the set of characters in string2.

 Portability:   Not supported by the ANSI standard.