#include <stdio.h>
#include <string.h>
#include <strings.h> //bzero
#include <stdlib.h>
 
#define alloca malloc // no alloca in the standard
#define DEBUG_STREAM stderr
#define BUFFER_SIZE_DEBUG 500
 
#define EVALUATE_TYPE(x) 1
 
#define _DEBUG_ADD(string, ...)                     \
do{                                                 \
if (EVALUATE_TYPE(string)){                         \
size_t  size = strlen(string) + BUFFER_SIZE_DEBUG;  \
char    *buffer = alloca(size);                     \
bzero(buffer, size);                                \
snprintf(buffer, size, string, __VA_ARGS__);        \
fwrite(buffer, strlen(buffer), 1, DEBUG_STREAM); }} \
while(0)
 
 
 
int main(void) {
	 _DEBUG_ADD("%d %d %d\n", 1, 2, 3);
}
 

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