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Python/memmove.c

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+/***********************************************************
+Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
+Amsterdam, The Netherlands.
+
+                        All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its 
+documentation for any purpose and without fee is hereby granted, 
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in 
+supporting documentation, and that the names of Stichting Mathematisch
+Centrum or CWI not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior permission.
+
+STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
+THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
+FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+******************************************************************/
+
+/* A perhaps slow but I hope correct implementation of memmove */
+
+extern char *memcpy();
+
+char *
+memmove(dst, src, n)
+	char *dst;
+	char *src;
+	int n;
+{
+	char *realdst = dst;
+	if (n <= 0)
+		return dst;
+	if (src >= dst+n || dst >= src+n)
+		return memcpy(dst, src, n);
+	if (src > dst) {
+		while (--n >= 0)
+			*dst++ = *src++;
+	}
+	else if (src < dst) {
+		src += n;
+		dst += n;
+		while (--n >= 0)
+			*--dst = *--src;
+	}
+	return realdst;
+}