--- a/bchunk.c	2017-10-30 18:03:58.658741629 +0000
+++ b/bchunk.c	2017-10-30 19:40:25.558131619 +0000
@@ -18,6 +18,7 @@
   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */

+#define _GNU_SOURCE
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -271,11 +272,10 @@
 	int16_t i;
 	float fl;
 	
-	if (!(fname = malloc(strlen(bname) + 8))) {
-		fprintf(stderr, "main(): malloc() failed, out of memory\n");
+	if (asprintf(&fname, "%s%2.2d.%s", bname, track->num, track->extension) == -1) {
+		fprintf(stderr, "writetrack(): asprintf() failed, out of memory\n");
 		exit(4);
 	}
-	sprintf(fname, "%s%2.2d.%s", bname, track->num, track->extension);
 	
 	printf("%2d: %s ", track->num, fname);