--- src/x_fun.c	1970-01-01 01:00:00.000000000 +0100
+++ src/x_fun.c	2008-10-11 00:33:17.000000000 +0200
@@ -0,0 +1,35 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+char *xstrdup(const char *s) {
+  char *p;
+
+  if (s == NULL) {
+    fprintf(stderr, "strdup failed\n");
+  }
+  p = strdup(s);
+  if (p == NULL) {
+    fprintf(stderr, "strdup failed\n");
+  }
+  return p;
+}
+
+void xfree(void *p) {
+  if (p != NULL) {
+    free(p);
+  }
+}
+
+void * xcalloc(unsigned int nelem,  unsigned int elsize) {
+  void * new_mem = (void *) calloc (nelem, elsize);
+  
+  if (new_mem == NULL) {
+    fprintf (stderr, "xcalloc: request for %u elements of size %u failed.\n",
+             nelem, elsize);
+    abort ();
+  }
+  
+  return new_mem;
+}
+