tests/tests2/80_macros.c

   1 #include <stdio.h>
   2
   3 #define A(a,b...) g(a,##b,##b)
   4 #define B(x...) x
   5 #define C   \
   6
   7 #define D(x,y) x ## y
   8 #define E(x,y,z) x ## y ## z
   9 #define F(x) x
  10 #define G C
  11
  12 #define STRINGIFY2(x) #x
  13 #define STRINGIFY(x) STRINGIFY2(x)
  14
  15 int main(void)
  16 {
  17   printf("%s\n", STRINGIFY()); // should produce the empty string
  18   printf("%s\n", STRINGIFY(C)); // should produce the empty string
  19   printf("%s\n", STRINGIFY(
  20                            A(a,)
  21                            A(a,b)
  22                            A(a,b,c)
  23                            )); // should produce g(a ) g(a,b,b)g(a,b,c,b,c)
  24   printf("%s\n", STRINGIFY(B())); // should produce the empty string
  25   printf("%s\n", STRINGIFY(B(C))); // should produce the empty string
  26   printf("%s\n", STRINGIFY(D(,))); // should produce the empty string
  27   printf("%s\n", STRINGIFY(E(1,,))); // should produce 1
  28   printf("%s\n", STRINGIFY(E(,2,))); // should produce 2
  29   printf("%s\n", STRINGIFY(E(,,3))); // should produce 3
  30   printf("%s\n", STRINGIFY(E(1,2,3))); // should produce 123
  31
  32   // should produce g(a ) g(a )g(a )g(a )g(a )
  33   printf("%s\n", STRINGIFY(A(a,F()) A(a,C) A(a,G) A(a,) A(a)));
  34
  35   return 0;
  36 }