scc

simple c99 compiler
git clone git://git.simple-cc.org/scc
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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 }