scc

simple c99 compiler
git clone git://git.simple-cc.org/scc
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isdigit.c (90B)

      1 #include <ctype.h>
      2 
      3 #undef isdigit
      4 
      5 int
      6 isdigit(int c)
      7 {
      8 	return (__ctype+1)[c] & (_D);
      9 }