1 files changed, 76 insertions, 0 deletions
diff --git a/src/sed/lib/memmove.c b/src/sed/lib/memmove.c
new file mode 100644
index 0000000..a0d730e
--- /dev/null
+++ b/src/sed/lib/memmove.c
@@ -0,0 +1,76 @@
+/* Copyright (C) 1998 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 the
+   Free Software Foundation; either version 2, 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
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   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.  */
+
+/* Last ditch effort to support memmove: if user doesn't have
+   memmove or bcopy, we offer this sluggish implementation. */
+
+#include "config.h"
+#ifndef HAVE_MEMMOVE
+
+#include <sys/types.h>
+#ifdef HAVE_MEMORY_H
+# include <memory.h>
+#endif
+
+#ifndef VOID
+# define VOID void
+#endif
+
+VOID *
+memmove(dest, src, len)
+  VOID *dest;
+  const VOID *src;
+  size_t len;
+{
+#ifdef HAVE_BCOPY
+  bcopy(src, dest, len);
+
+#else /*!HAVE_BCOPY*/
+  char *dp = dest;
+  const char *sp = src;
+
+# ifdef HAVE_MEMCPY
+  /* A special-case for non-overlapping regions, on the assumption
+     that there is some hope that the sytem's memcpy() implementaion
+     is better than our dumb fall-back one. */
+  if ((dp < sp && dp+len < sp) || (sp < dp && sp+len < dp))
+    return memcpy(dest, src, len);
+# endif
+
+  /* I tried real hard to avoid getting to this point.
+     You *really* ought to upgrade your system's libraries;
+	 the performance of this implementation sucks. */
+  if (dp < sp)
+    {
+      while (len-- > 0)
+	*dp++ = *sp++;
+    }
+  else
+    {
+      if (dp == sp)
+	return dest;
+      dp += len;
+      sp += len;
+      while (len-- > 0)
+	*--dp = *--sp;
+    }
+#endif /*!HAVE_BCOPY*/
+
+  return dest;
+}
+
+#endif	/*!HAVE_MEMMOVE*/