mmalloc from last version to be included in gdb.

[ocaml-ancient.git] / mmalloc / mmemalign.c

diff --git a/mmalloc/mmemalign.c b/mmalloc/mmemalign.c
new file mode 100644 (file)
index 0000000..3ada027
--- /dev/null
+++ b/mmalloc/mmemalign.c
@@ -0,0 +1,62 @@
+/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#include "mmprivate.h"
+
+PTR
+mmemalign (md, alignment, size)
+  PTR md;
+  size_t alignment;
+  size_t size;
+{
+  PTR result;
+  unsigned long int adj;
+  struct alignlist *l;
+  struct mdesc *mdp;
+
+  if ((result = mmalloc (md, size + alignment - 1)) != NULL)
+    {
+      adj = RESIDUAL (result, alignment);
+      if (adj != 0)
+       {
+         mdp = MD_TO_MDP (md);
+         for (l = mdp -> aligned_blocks; l != NULL; l = l -> next)
+           {
+             if (l -> aligned == NULL)
+               {
+                 /* This slot is free.  Use it.  */
+                 break;
+               }
+           }
+         if (l == NULL)
+           {
+             l = (struct alignlist *) mmalloc (md, sizeof (struct alignlist));
+             if (l == NULL)
+               {
+                 mfree (md, result);
+                 return (NULL);
+               }
+             l -> next = mdp -> aligned_blocks;
+             mdp -> aligned_blocks = l;
+           }
+         l -> exact = result;
+         result = l -> aligned = (char *) result + alignment - adj;
+       }
+    }
+  return (result);
+}