cookie: allocate the main struct once cookie is fine

This delays the allocating of the cookie struct until after all the
checks have been done, as many cookies are received and discarded
instead of accepted and this then saves one allocation for every
discarded cookie.

Closes #19864

diff --git a/lib/cookie.c b/lib/cookie.c
index 5c29768bbdfc4d9d9b5e5ddde9ef4e2e828634e0..743ed56404a5f2292018e9f9622c115d2d3a1db5 100644 (file)
--- a/lib/cookie.c
+++ b/lib/cookie.c
@@ -65,14 +65,15 @@ static void cap_expires(time_t now, struct Cookie *co)
   }
 }
 
-static void freecookie(struct Cookie *co)
+static void freecookie(struct Cookie *co, bool maintoo)
 {
   curlx_free(co->domain);
   curlx_free(co->path);
   curlx_free(co->spath);
   curlx_free(co->name);
   curlx_free(co->value);
-  curlx_free(co);
+  if(maintoo)
+    curlx_free(co);
 }
 
 static bool cookie_tailmatch(const char *cookie_domain,
@@ -312,7 +313,7 @@ static void remove_expired(struct CookieInfo *ci)
       if(co->expires) {
         if(co->expires < now) {
           Curl_node_remove(n);
-          freecookie(co);
+          freecookie(co, TRUE);
           ci->numcookies--;
         }
         else if(co->expires < ci->next_expiration)
@@ -938,7 +939,7 @@ static bool replace_existing(struct Curl_easy *data,
     Curl_node_remove(replace_n);
 
     /* free the old cookie */
-    freecookie(repl);
+    freecookie(repl, TRUE);
   }
   *replacep = replace_old;
   return TRUE;
@@ -964,6 +965,7 @@ Curl_cookie_add(struct Curl_easy *data,
                                        unless set */
                 bool secure)  /* TRUE if connection is over secure origin */
 {
+  struct Cookie comem;
   struct Cookie *co;
   size_t myhash;
   CURLcode result;
@@ -975,10 +977,8 @@ Curl_cookie_add(struct Curl_easy *data,
   if(data->req.setcookies >= MAX_SET_COOKIE_AMOUNT)
     return CURLE_OK; /* silently ignore */
 
-  /* First, alloc and init a new struct for it */
-  co = curlx_calloc(1, sizeof(struct Cookie));
-  if(!co)
-    return CURLE_OUT_OF_MEMORY; /* bail out if we are this low on memory */
+  co = &comem;
+  memset(co, 0, sizeof(comem));
 
   if(httpheader)
     result = parse_cookie_header(data, co, ci, &okay,
@@ -1028,6 +1028,13 @@ Curl_cookie_add(struct Curl_easy *data,
   if(!replace_existing(data, co, ci, secure, &replaces))
     goto fail;
 
+  /* clone the stack struct into heap */
+  co = Curl_memdup(&comem, sizeof(comem));
+  if(!co) {
+    co = &comem;
+    goto fail; /* bail out if we are this low on memory */
+  }
+
   /* add this cookie to the list */
   myhash = cookiehash(co->domain);
   Curl_llist_append(&ci->cookielist[myhash], co, &co->node);
@@ -1054,7 +1061,7 @@ Curl_cookie_add(struct Curl_easy *data,
 
   return result;
 fail:
-  freecookie(co);
+  freecookie(co, FALSE);
   return result;
 }
 
@@ -1382,7 +1389,7 @@ void Curl_cookie_clearall(struct CookieInfo *ci)
         struct Cookie *c = Curl_node_elem(n);
         struct Curl_llist_node *e = Curl_node_next(n);
         Curl_node_remove(n);
-        freecookie(c);
+        freecookie(c, TRUE);
         n = e;
       }
     }
@@ -1411,7 +1418,7 @@ void Curl_cookie_clearsess(struct CookieInfo *ci)
       e = Curl_node_next(n); /* in case the node is removed, get it early */
       if(!curr->expires) {
         Curl_node_remove(n);
-        freecookie(curr);
+        freecookie(curr, TRUE);
         ci->numcookies--;
       }
     }