+read_utmp (const char *filename, int *n_entries, STRUCT_UTMP **utmp_buf)
+{
+ int count_utmp = 0;
+ int n_read;
+ STRUCT_UTMP *u;
+ STRUCT_UTMP *uptr;
+ STRUCT_UTMP *utmp_contents;
+
+ if (utmpname (filename))
+ {
+ return 1;
+ }
+
+ /* FIXME: going through the list twice is wasteful. */
+
+ /* count the entries in utmp */
+ setutent ();
+ while ((u = getutent ()) != NULL)
+ ++count_utmp;
+
+ if (count_utmp == 0)
+ return 0;
+
+ utmp_contents = (STRUCT_UTMP *) xmalloc (count_utmp * sizeof (STRUCT_UTMP));
+
+ /* read the entries in utmp */
+
+ /* FIXME: can this fail? */
+ setutent ();
+
+ n_read = 0;
+ uptr = utmp_contents;
+ while ((u = getutent ()) != NULL)
+ {
+ ++n_read;
+ if (n_read > count_utmp)
+ {
+ STRUCT_UTMP *old_utmp_contents = utmp_contents;
+ ++count_utmp;
+ utmp_contents = (STRUCT_UTMP *) xrealloc (utmp_contents,
+ (count_utmp
+ * sizeof (STRUCT_UTMP)));
+ uptr = utmp_contents + (uptr - old_utmp_contents);
+ }
+ *uptr = *u;
+ ++uptr;
+ }
+
+ if (n_read != count_utmp)
+ utmp_contents = (STRUCT_UTMP *) xrealloc (utmp_contents,
+ n_read * sizeof (STRUCT_UTMP));
+
+ /* FIXME: can this fail? */
+ endutent ();
+
+ *n_entries = n_read;
+ *utmp_buf = utmp_contents;
+
+ return 0;
+}
+
+#else
+
+int
+read_utmp (const char *filename, int *n_entries, STRUCT_UTMP **utmp_buf)