about to break things

Signed-off-by: Sean Cross <sean@xobs.io>

third_party/libbase/libc.c

@@ -39,4 +39,79 @@ strlen(const char *str)
 	for (s = str; *s; ++s)
 		;
 	return (s - str);
+}
+
+/**
+ * memcpy - Copies one area of memory to another
+ * @dest: Destination
+ * @src: Source
+ * @n: The size to copy.
+ */
+void *memcpy(void *to, const void *from, size_t n)
+{
+	void *xto = to;
+	size_t temp;
+
+	if(!n)
+		return xto;
+	if((long)to & 1) {
+		char *cto = to;
+		const char *cfrom = from;
+		*cto++ = *cfrom++;
+		to = cto;
+		from = cfrom;
+		n--;
+	}
+	if((long)from & 1) {
+		char *cto = to;
+		const char *cfrom = from;
+		for (; n; n--)
+			*cto++ = *cfrom++;
+		return xto;
+	}
+	if(n > 2 && (long)to & 2) {
+		short *sto = to;
+		const short *sfrom = from;
+		*sto++ = *sfrom++;
+		to = sto;
+		from = sfrom;
+		n -= 2;
+	}
+	if((long)from & 2) {
+		short *sto = to;
+		const short *sfrom = from;
+		temp = n >> 1;
+		for (; temp; temp--)
+			*sto++ = *sfrom++;
+		to = sto;
+		from = sfrom;
+		if(n & 1) {
+			char *cto = to;
+			const char *cfrom = from;
+			*cto = *cfrom;
+		}
+		return xto;
+	}
+	temp = n >> 2;
+	if(temp) {
+		long *lto = to;
+		const long *lfrom = from;
+		for(; temp; temp--)
+			*lto++ = *lfrom++;
+		to = lto;
+		from = lfrom;
+	}
+	if(n & 2) {
+		short *sto = to;
+		const short *sfrom = from;
+		*sto++ = *sfrom++;
+		to = sto;
+		from = sfrom;
+	}
+	if(n & 1) {
+		char *cto = to;
+		const char *cfrom = from;
+		*cto = *cfrom;
+	}
+	return xto;
 }