#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <assert.h>
#include <string.h>
 
#define DEBUG
 
#ifdef DEBUG
#define debug_print(fmt, ...) \
	do { fprintf(stderr, "%s:%d:%s(): " fmt, __FILE__, \
			__LINE__, __func__, __VA_ARGS__); } while (0)
#else
#define debug_print(fmt,...)
#endif
 
#define FILENAME "test.txt"
int main(void) {
	FILE *fp = fopen(FILENAME,"r");
	if(!fp) {
		debug_print("%s: %s\n",strerror(errno),FILENAME);
		exit(EXIT_FAILURE);
	}
	return 0;
}
 

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