Add a WS_Copy() function and use it a couple of places.

bin/varnishd/cache/cache.h

@@ -1034,6 +1034,7 @@ void WS_ReleaseP(struct ws *ws, char *ptr);
 void WS_Assert(const struct ws *ws);
 void WS_Reset(struct ws *ws, char *p);
 char *WS_Alloc(struct ws *ws, unsigned bytes);
+char *WS_Copy(struct ws *ws, const char *str, int len);
 char *WS_Snapshot(struct ws *ws);
 
 /* rfc2616.c */

bin/varnishd/cache/cache_http.c

@@ -888,10 +888,9 @@ http_CopyHome(const struct http *hp)
 			continue;
 		}
 		l = Tlen(hp->hd[u]);
-		p = WS_Alloc(hp->ws, l + 1);
+		p = WS_Copy(hp->ws, hp->hd[u].b, l + 1L);
 		if (p != NULL) {
 			http_VSLH(hp, u);
-			memcpy(p, hp->hd[u].b, l + 1L);
 			hp->hd[u].b = p;
 			hp->hd[u].e = p + l;
 		} else {

bin/varnishd/cache/cache_req_fsm.c

@@ -617,9 +617,9 @@ cnt_fetchbody(struct worker *wrk, struct req *req)
 		req->obj->gziped = 1;
 
 	if (vary != NULL) {
-		req->obj->vary = (void *)WS_Alloc(req->obj->http->ws, varyl);
+		req->obj->vary = (void *)WS_Copy(req->obj->http->ws,
+		    VSB_data(vary), varyl);
 		AN(req->obj->vary);
-		memcpy(req->obj->vary, VSB_data(vary), varyl);
 		VRY_Validate(req->obj->vary);
 		VSB_delete(vary);
 	}

bin/varnishd/cache/cache_ws.c

@@ -116,6 +116,33 @@ WS_Alloc(struct ws *ws, unsigned bytes)
 	return (r);
 }
 
+char *
+WS_Copy(struct ws *ws, const char *str, int len)
+{
+	char *r;
+	unsigned bytes;
+
+	WS_Assert(ws);
+	assert(ws->r == NULL);
+
+	if (len == -1)
+		len = strlen(str) + 1;
+	assert(len >= 0);
+
+	bytes = PRNDUP((unsigned)len);
+	if (ws->f + bytes > ws->e) {
+		ws->overflow++;
+		WS_Assert(ws);
+		return(NULL);
+	}
+	r = ws->f;
+	ws->f += bytes;
+	memcpy(r, str, len);
+	DSL(DBG_WORKSPACE, 0, "WS_Copy(%p, %d) = %p", ws, len, r);
+	WS_Assert(ws);
+	return (r);
+}
+
 char *
 WS_Snapshot(struct ws *ws)
 {
@@ -174,15 +201,3 @@ WS_ReleaseP(struct ws *ws, char *ptr)
 	ws->r = NULL;
 	WS_Assert(ws);
 }
-
-#if 0
-/* XXX: not used anywhere (yet) */
-void
-WS_Return(struct ws *ws, char *s, char *e)
-{
-
-	WS_Assert(ws);
-	if (e == ws->f)
-		ws->f = s;
-}
-#endif