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       isxdigit.c - scc - simple c99 compiler
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       ---
       isxdigit.c (94B)
       ---
            1 #include <ctype.h>
            2 #undef isxdigit
            3 
            4 int
            5 isxdigit(int c)
            6 {
            7         return (__ctype+1)[c] & (_D|_X);
            8 }