initial import

sysdeps/generic/memcpy.c

@@ -0,0 +1,55 @@
+/* memcpy -- copy memory to memory until the specified number of bytes
+   has been copied.  Overlap is NOT handled correctly.
+   Copyright (C) 1991 Free Software Foundation, Inc.
+   Contributed by Torbjorn Granlund (tege@sics.se).
+
+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., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <string.h>
+#include <memcopy.h>
+
+PTR
+DEFUN(memcpy, (dstpp, srcpp, len),
+      PTR dstpp AND CONST PTR srcpp AND size_t len)
+{
+  unsigned long int dstp = (long int) dstpp;
+  unsigned long int srcp = (long int) srcpp;
+
+  /* Copy from the beginning to the end.  */
+
+  /* If there not too few bytes to copy, use word copy.  */
+  if (len >= OP_T_THRES)
+    {
+      /* Copy just a few bytes to make DSTP aligned.  */
+      len -= (-dstp) % OPSIZ;
+      BYTE_COPY_FWD (dstp, srcp, (-dstp) % OPSIZ);
+
+      /* Copy from SRCP to DSTP taking advantage of the known
+	 alignment of DSTP.  Number of bytes remaining is put
+	 in the third argumnet, i.e. in LEN.  This number may
+	 vary from machine to machine.  */
+
+      WORD_COPY_FWD (dstp, srcp, len, len);
+
+      /* Fall out and copy the tail.  */
+    }
+
+  /* There are just a few bytes to copy.  Use byte memory operations.  */
+  BYTE_COPY_FWD (dstp, srcp, len);
+
+  return dstpp;
+}