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authorIgor Pashev <pashev.igor@gmail.com>2012-06-24 22:28:35 +0000
committerIgor Pashev <pashev.igor@gmail.com>2012-06-24 22:28:35 +0000
commit3950ffe2a485479f6561c27364d3d7df5a21d124 (patch)
tree468c6e14449d1b1e279222ec32f676b0311917d2 /src/lib/libast/comp/memmove.c
downloadksh-upstream.tar.gz
Imported Upstream version 93u+upstream
Diffstat (limited to 'src/lib/libast/comp/memmove.c')
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diff --git a/src/lib/libast/comp/memmove.c b/src/lib/libast/comp/memmove.c
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+++ b/src/lib/libast/comp/memmove.c
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+/***********************************************************************
+* *
+* 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