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       _dtoi.c - scc - simple c99 compiler
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       ---
       _dtoi.c (261B)
       ---
            1 #include <ctype.h>
            2 #include <limits.h>
            3 #include <string.h>
            4 
            5 #include "../libc.h"
            6 
            7 int
            8 _dtoi(char c)
            9 {
           10         static const char digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
           11         char *p;
           12 
           13         if (p = strchr(digits, toupper(c)))
           14                 return p - digits;
           15 
           16         return INT_MAX;
           17 }