1 files changed, 59 insertions, 0 deletions
diff --git a/libgloss/mep/sbrk.c b/libgloss/mep/sbrk.c
new file mode 100644
index 0000000..9ec8676
--- /dev/null
+++ b/libgloss/mep/sbrk.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2003  Red Hat, Inc. All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the BSD 
+ * License.  This program is distributed in the hope that it will be useful, 
+ * but WITHOUT ANY WARRANTY expressed or implied, including the implied 
+ * warranties of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  A copy 
+ * of this license is available at http://www.opensource.org/licenses. Any 
+ * Red Hat trademarks that are incorporated in the source code or documentation
+ * are not subject to the BSD License and may only be used or replicated with 
+ * the express permission of Red Hat, Inc.
+ */
+
+#include <errno.h>
+
+extern int __heap __far;      /* beginning of heap */
+extern int __heap_end __far;  /* if at address 0, use stack pointer as limit */
+
+static char *the_break = (char *)(& __heap);
+
+int
+is_addr_0 (int address)
+{
+  return address ? 0 : 1;
+}
+
+void *
+sbrk(int inc)
+{
+  char *current_heap_limit = (char *) (& __heap_end);
+
+  /* is_addr_0 avoids optimizing out this block.  */
+  if (is_addr_0 ((int) current_heap_limit))
+    {
+      int something;
+      int margin = 4096;
+      current_heap_limit = (char *) (& something) - margin;
+    }
+
+  if ((the_break + inc) < current_heap_limit)
+    {
+      void *rv = (void *) the_break;
+      the_break += inc;
+      return rv;
+    }
+  else
+    {
+      errno = ENOMEM;
+      return (void *) -1;
+    }
+}
+
+int
+brk (void *ptr)
+{
+  the_break = ptr;
+  return 0;
+}