scc

simple c99 compiler
git clone git://git.simple-cc.org/scc
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isupper.c (87B)

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