1 files changed, 120 insertions, 0 deletions
diff --git a/FICS/memmove.c b/FICS/memmove.c
new file mode 100644
index 0000000..7f2ee3a
--- /dev/null
+++ b/FICS/memmove.c
@@ -0,0 +1,120 @@
+/*-
+ * Copyright (c) 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)bcopy.c	8.1 (Berkeley) 6/4/93";
+#endif				/* LIBC_SCCS and not lint */
+
+/* #include <sys/cdefs.h>
+*/
+#include <string.h>
+
+/*
+ * sizeof(word) MUST BE A POWER OF TWO
+ * SO THAT wmask BELOW IS ALL ONES
+ */
+typedef int word;		/* "word" used for optimal copy speed */
+
+#define	wsize	sizeof(word)
+#define	wmask	(wsize - 1)
+
+/*
+ * Copy a block of memory, handling overlap.
+ * This is the routine that actually implements
+ * (the portable versions of) bcopy, memcpy, and memmove.
+ */
+void *
+ memmove(dst0, src0, length)
+void *dst0;
+const void *src0;
+register size_t length;
+{
+  register char *dst = dst0;
+  register const char *src = src0;
+  register size_t t;
+
+  if (length == 0 || dst == src)/* nothing to do */
+    goto done;
+
+  /* Macros: loop-t-times; and loop-t-times, t>0 */
+#define	TLOOP(s) if (t) TLOOP1(s)
+#define	TLOOP1(s) do { s; } while (--t)
+
+  if ((unsigned long) dst < (unsigned long) src) {
+    /* Copy forward. */
+    t = (int) src;		/* only need low bits */
+    if ((t | (int) dst) & wmask) {
+      /* Try to align operands.  This cannot be done unless the low bits
+         match. */
+      if ((t ^ (int) dst) & wmask || length < wsize)
+	t = length;
+      else
+	t = wsize - (t & wmask);
+      length -= t;
+      TLOOP1(*dst++ = *src++);
+    }
+    /* Copy whole words, then mop up any trailing bytes. */
+    t = length / wsize;
+    TLOOP(*(word *) dst = *(word *) src;
+    src += wsize;
+    dst += wsize);
+    t = length & wmask;
+    TLOOP(*dst++ = *src++);
+  } else {
+    /* Copy backwards.  Otherwise essentially the same. Alignment works as
+       before, except that it takes (t&wmask) bytes to align, not
+       wsize-(t&wmask). */
+    src += length;
+    dst += length;
+    t = (int) src;
+    if ((t | (int) dst) & wmask) {
+      if ((t ^ (int) dst) & wmask || length <= wsize)
+	t = length;
+      else
+	t &= wmask;
+      length -= t;
+      TLOOP1(*--dst = *--src);
+    }
+    t = length / wsize;
+    TLOOP(src -= wsize;
+    dst -= wsize;
+    *(word *) dst = *(word *) src);
+    t = length & wmask;
+    TLOOP(*--dst = *--src);
+  }
+done:
+  return (dst0);
+}