X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Freadutmp.c;h=f2fd7f9336f16fd045d819a1a1e0df492a07837a;hb=1ef07171f7e8abdb703651a0f6c81e17559b3720;hp=d29163c0c1b5b44202127793479b9038afed2202;hpb=7abd4b240bc7c882a73035f494321855f8876d39;p=gnulib.git

diff --git a/lib/readutmp.c b/lib/readutmp.c
index d29163c0c..f2fd7f933 100644
--- a/lib/readutmp.c
+++ b/lib/readutmp.c
@@ -1,5 +1,5 @@
 /* GNU's read utmp module.
-   Copyright (C) 92, 93, 94, 95, 96, 1997, 1998 Free Software Foundation, Inc.
+   Copyright (C) 1992-1999 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -19,6 +19,8 @@
 
 #include <config.h>
 
+#include <stdio.h>
+
 #include <sys/stat.h>
 #if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
 # include <string.h>
@@ -29,6 +31,7 @@
 #include "readutmp.h"
 
 char *xmalloc ();
+char *realloc ();
 
 /* Copy UT->ut_name into storage obtained from malloc.  Then remove any
    trailing spaces from the copy, NUL terminate it, and return the copy.  */
@@ -49,70 +52,39 @@ extract_trimmed_name (const STRUCT_UTMP *ut)
   return trimmed_name;
 }
 
-/* Read the utmp file FILENAME into *UTMP_BUF, set *N_ENTRIES to the
-   number of entries read, and return zero.  If there is any error,
+/* Read the utmp entries corresponding to file FILENAME into freshly-
+   malloc'd storage, set *UTMP_BUF to that pointer, set *N_ENTRIES to
+   the number of entries, and return zero.  If there is any error,
    return non-zero and don't modify the parameters.  */
 
-#ifdef HAVE_UTMPNAME
+#if HAVE_UTMPNAME
 
 int
 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;
+  STRUCT_UTMP *utmp = NULL;
 
   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 */
+    return 1;
 
-  /* 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;
+      utmp = (STRUCT_UTMP *) realloc (utmp, n_read * sizeof (STRUCT_UTMP));
+      if (utmp == NULL)
+	return 1;
+      utmp[n_read - 1] = *u;
     }
 
-  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;
+  *utmp_buf = utmp;
 
   return 0;
 }