9os

Experimental kernel using plan9 ideas for embedded device
git clone git://git.simple-cc.org/9os
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isdigit.c (89B)

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