X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Frealloc.c;h=0c96ffacbac0d575b1ee3007fa0436b06a34f8ad;hb=ceb5e1790ec098f09dc388ca25cba015f224dc51;hp=c1fe9e5a18752d8cf36958614fb66ea7517bfefe;hpb=0632e115747ff96e93330c88f536d7354a7ce507;p=gnulib.git

diff --git a/lib/realloc.c b/lib/realloc.c
index c1fe9e5a1..0c96ffacb 100644
--- a/lib/realloc.c
+++ b/lib/realloc.c
@@ -1,11 +1,12 @@
 /* realloc() function that is glibc compatible.
 
-   Copyright (C) 1997, 2003, 2004, 2006 Free Software Foundation, Inc.
+   Copyright (C) 1997, 2003-2004, 2006-2007, 2009-2011 Free Software
+   Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
+   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
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -13,16 +14,31 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software Foundation,
-   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
-/* written by Jim Meyering */
+/* written by Jim Meyering and Bruno Haible */
 
+#define _GL_USE_STDLIB_ALLOC 1
 #include <config.h>
-#undef realloc
+
+/* Only the AC_FUNC_REALLOC macro defines 'realloc' already in config.h.  */
+#ifdef realloc
+# define NEED_REALLOC_GNU 1
+/* Whereas the gnulib module 'realloc-gnu' defines HAVE_REALLOC_GNU.  */
+#elif GNULIB_REALLOC_GNU && !HAVE_REALLOC_GNU
+# define NEED_REALLOC_GNU 1
+#endif
+
+/* Infer the properties of the system's malloc function.
+   The gnulib module 'malloc-gnu' defines HAVE_MALLOC_GNU.  */
+#if GNULIB_MALLOC_GNU && HAVE_MALLOC_GNU
+# define SYSTEM_MALLOC_GLIBC_COMPATIBLE 1
+#endif
 
 #include <stdlib.h>
 
+#include <errno.h>
+
 /* Change the size of an allocated block of memory P to N bytes,
    with error checking.  If N is zero, change it to 1.  If P is NULL,
    use malloc.  */
@@ -30,6 +46,9 @@
 void *
 rpl_realloc (void *p, size_t n)
 {
+  void *result;
+
+#if NEED_REALLOC_GNU
   if (n == 0)
     {
       n = 1;
@@ -38,8 +57,23 @@ rpl_realloc (void *p, size_t n)
       free (p);
       p = NULL;
     }
+#endif
 
   if (p == NULL)
-    return malloc (n);
-  return realloc (p, n);
+    {
+#if GNULIB_REALLOC_GNU && !NEED_REALLOC_GNU && !SYSTEM_MALLOC_GLIBC_COMPATIBLE
+      if (n == 0)
+        n = 1;
+#endif
+      result = malloc (n);
+    }
+  else
+    result = realloc (p, n);
+
+#if !HAVE_REALLOC_POSIX
+  if (result == NULL)
+    errno = ENOMEM;
+#endif
+
+  return result;
 }