init repo.

third_party/curl/lib/llist.c

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+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+
+#include "curl_setup.h"
+
+#include <curl/curl.h>
+
+#include "llist.h"
+#include "curl_memory.h"
+
+/* this must be the last include file */
+#include "memdebug.h"
+
+/*
+ * @unittest: 1300
+ */
+void
+Curl_llist_init(struct Curl_llist *l, Curl_llist_dtor dtor)
+{
+  l->size = 0;
+  l->dtor = dtor;
+  l->head = NULL;
+  l->tail = NULL;
+}
+
+/*
+ * Curl_llist_insert_next()
+ *
+ * Inserts a new list element after the given one 'e'. If the given existing
+ * entry is NULL and the list already has elements, the new one will be
+ * inserted first in the list.
+ *
+ * The 'ne' argument should be a pointer into the object to store.
+ *
+ * @unittest: 1300
+ */
+void
+Curl_llist_insert_next(struct Curl_llist *list, struct Curl_llist_element *e,
+                       const void *p,
+                       struct Curl_llist_element *ne)
+{
+  ne->ptr = (void *) p;
+  if(list->size == 0) {
+    list->head = ne;
+    list->head->prev = NULL;
+    list->head->next = NULL;
+    list->tail = ne;
+  }
+  else {
+    /* if 'e' is NULL here, we insert the new element first in the list */
+    ne->next = e?e->next:list->head;
+    ne->prev = e;
+    if(!e) {
+      list->head->prev = ne;
+      list->head = ne;
+    }
+    else if(e->next) {
+      e->next->prev = ne;
+    }
+    else {
+      list->tail = ne;
+    }
+    if(e)
+      e->next = ne;
+  }
+
+  ++list->size;
+}
+
+/*
+ * Curl_llist_append()
+ *
+ * Adds a new list element to the end of the list.
+ *
+ * The 'ne' argument should be a pointer into the object to store.
+ *
+ * @unittest: 1300
+ */
+void
+Curl_llist_append(struct Curl_llist *list, const void *p,
+                  struct Curl_llist_element *ne)
+{
+  Curl_llist_insert_next(list, list->tail, p, ne);
+}
+
+/*
+ * @unittest: 1300
+ */
+void
+Curl_llist_remove(struct Curl_llist *list, struct Curl_llist_element *e,
+                  void *user)
+{
+  void *ptr;
+  if(!e || list->size == 0)
+    return;
+
+  if(e == list->head) {
+    list->head = e->next;
+
+    if(!list->head)
+      list->tail = NULL;
+    else
+      e->next->prev = NULL;
+  }
+  else {
+    if(e->prev)
+      e->prev->next = e->next;
+
+    if(!e->next)
+      list->tail = e->prev;
+    else
+      e->next->prev = e->prev;
+  }
+
+  ptr = e->ptr;
+
+  e->ptr  = NULL;
+  e->prev = NULL;
+  e->next = NULL;
+
+  --list->size;
+
+  /* call the dtor() last for when it actually frees the 'e' memory itself */
+  if(list->dtor)
+    list->dtor(user, ptr);
+}
+
+void
+Curl_llist_destroy(struct Curl_llist *list, void *user)
+{
+  if(list) {
+    while(list->size > 0)
+      Curl_llist_remove(list, list->tail, user);
+  }
+}
+
+size_t
+Curl_llist_count(struct Curl_llist *list)
+{
+  return list->size;
+}