Imported Upstream version 93u+upstream

1 files changed, 53 insertions, 0 deletions

diff --git a/src/lib/libast/comp/memmove.c b/src/lib/libast/comp/memmove.c
new file mode 100644
index 0000000..9d5ba59
--- /dev/null
+++ b/src/lib/libast/comp/memmove.c
@@ -0,0 +1,53 @@
+/***********************************************************************
+*                                                                      *
+*               This software is part of the ast package               *
+*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
+*                      and is licensed under the                       *
+*                 Eclipse Public License, Version 1.0                  *
+*                    by AT&T Intellectual Property                     *
+*                                                                      *
+*                A copy of the License is available at                 *
+*          http://www.eclipse.org/org/documents/epl-v10.html           *
+*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
+*                                                                      *
+*              Information and Software Systems Research               *
+*                            AT&T Research                             *
+*                           Florham Park NJ                            *
+*                                                                      *
+*                 Glenn Fowler <gsf@research.att.com>                  *
+*                  David Korn <dgk@research.att.com>                   *
+*                   Phong Vo <kpv@research.att.com>                    *
+*                                                                      *
+***********************************************************************/
+#pragma prototyped
+
+#include <ast.h>
+
+#if _lib_memmove
+
+NoN(memmove)
+
+#else
+
+void*
+memmove(void* to, const void* from, register size_t n)
+{
+	register char*	out = (char*)to;
+	register char*	in = (char*)from;
+
+	if (n <= 0)	/* works if size_t is signed or not */
+		;
+	else if (in + n <= out || out + n <= in)
+		return(memcpy(to, from, n));	/* hope it's fast*/
+	else if (out < in)
+		do *out++ = *in++; while (--n > 0);
+	else
+	{
+		out += n;
+		in += n;
+		do *--out = *--in; while(--n > 0);
+	}
+	return(to);
+}
+
+#endif