nested_c89_macros.c

#include <stdio.h>

#define NP_VX(verts) short x[verts]
#define NP_VY(verts) short y[verts]
#define NP_AX(xcoords...) = {xcoords};
#define NP_AY(ycoords...) = {ycoords};
#define NP_CO(vals...) short color[4] = {vals};
#define NP_SH(np_name, np_vx, np_vy, np_ax, np_ay, np_co) 			\
	void np_name(){								\
		np_vx 								\
		np_ax								\
		np_vy 								\
		np_ay								\
		np_co								\
		printf("x[1]+y[1]+color[1]: %d\n", (x[1]+y[1]+color[1]));	\
	}																

NP_SH(
	test_shape_1,
	NP_VX(3),
	NP_VY(3), 
	NP_AX(1, 2, 3), 
	NP_AY(4, 5, 6), 
	NP_CO(123, 234, 45, 12)
);

NP_SH(
	test_shape_2,
	NP_VX(5),
	NP_VY(5), 
	NP_AX(111, 211, 311, 144, 345), 
	NP_AY(411, 511, 611, 123, 999), 
	NP_CO(123, 234, 45, 12)
);

/*

`gcc -E main.c` Expands the macro and usage to one-liners of:

void test_shape_1(){ 
	short x[3] = {1, 2, 3}; 
	short y[3] = {4, 5, 6}; 
	short color[4] = {123, 234, 45, 12}; 
	printf("x[1]+y[1]+color[1]: %d\n", (x[1]+y[1]+color[1])); 
}

void test_shape_2(){ 
	short x[5] = {111, 211, 311, 144, 345}; 
	short y[5] = {411, 511, 611, 123, 999}; 
	short color[4] = {123, 234, 45, 12}; 
	printf("x[1]+y[1]+color[1]: %d\n", (x[1]+y[1]+color[1])); 
}

*/


int main(){

	test_shape_1();
	test_shape_2();

	return 0;
}