tool: Generate easysrc with last cache linked-list

Using a last cache linked-list improves the performance of easysrc
generation.

Bug: https://github.com/bagder/curl/issues/444
Ref: https://github.com/bagder/curl/issues/429

Closes #452

1 files changed, 56 insertions, 0 deletions

diff --git a/src/slist_wc.h b/src/slist_wc.h
new file mode 100644
index 000000000..88fa142ee
--- /dev/null
+++ b/src/slist_wc.h
@@ -0,0 +1,56 @@
+#ifndef HEADER_CURL_SLIST_WC_H
+#define HEADER_CURL_SLIST_WC_H
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2015, 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 http://curl.haxx.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.
+ *
+ ***************************************************************************/
+
+#include "tool_setup.h"
+#ifndef CURL_DISABLE_LIBCURL_OPTION
+
+/* linked-list structure with last node cache for easysrc */
+struct slist_wc {
+  struct curl_slist *first;
+  struct curl_slist *last;
+};
+
+/*
+ * NAME curl_slist_wc_append()
+ *
+ * DESCRIPTION
+ *
+ * Appends a string to a linked list. If no list exists, it will be created
+ * first. Returns the new list, after appending.
+ */
+struct slist_wc *slist_wc_append(struct slist_wc *, const char *);
+
+/*
+ * NAME curl_slist_free_all()
+ *
+ * DESCRIPTION
+ *
+ * free a previously built curl_slist_wc.
+ */
+void slist_wc_free_all(struct slist_wc *);
+
+#endif /* CURL_DISABLE_LIBCURL_OPTION */
+
+#endif /* HEADER_CURL_SLIST_WC_H */
+