Something

int fmyaffiche(FILE *in, unsigned char *buf, int len)
{
	int i,m=0;

	if(len)
		fprintf(in,"\r\n");
	for(i = 0; i <len; i++){
		//printf("%02x ",reverse(buf[i]));
		fprintf(in,"%02x ",buf[i]);
		if (m == 15){
			fprintf(in,"\r\n");
			m = 0;
		}
		else m++;
	}
	if(len)
		fprintf(in,"\r\n");
	
	return 0;
}