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       isalnum.c - scc - simple c99 compiler
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       ---
       isalnum.c (95B)
       ---
            1 #include <ctype.h>
            2 #undef isalnum
            3 
            4 int
            5 isalnum(int c)
            6 {
            7         return (__ctype+1)[c] & (_U|_L|_D);
            8 }