Add json include

scripting/include/json/helpers/errors.inc

@@ -0,0 +1,64 @@
+/**
+ * vim: set ts=4 :
+ * =============================================================================
+ * sm-json
+ * A pure SourcePawn JSON encoder/decoder.
+ * https://github.com/clugg/sm-json
+ *
+ * sm-json (C)2022 James Dickens. (clug)
+ * SourceMod (C)2004-2008 AlliedModders LLC.  All rights reserved.
+ * =============================================================================
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, version 3.0, as published by the
+ * Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * As a special exception, AlliedModders LLC gives you permission to link the
+ * code of this program (as well as its derivative works) to "Half-Life 2," the
+ * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
+ * by the Valve Corporation.  You must obey the GNU General Public License in
+ * all respects for all other code used.  Additionally, AlliedModders LLC grants
+ * this exception to all derivative works.  AlliedModders LLC defines further
+ * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
+ * or <http://www.sourcemod.net/license.php>.
+ */
+
+#if defined _json_helpers_errors_included
+ #endinput
+#endif
+#define _json_helpers_errors_included
+
+static char g_jsonLastError[1024] = "";
+
+/**
+ * Stores the error provided as the 'last error' for later access.
+ * @internal
+ *
+ * @param error     Error to store.
+ * @param ...       Further arguments to pass to message formatter.
+ */
+stock void json_set_last_error(const char[] error, any ...)
+{
+    VFormat(g_jsonLastError, sizeof(g_jsonLastError), error, 2);
+}
+
+/**
+ * Retrieves the last error encountered and stores it in the buffer provided.
+ *
+ * @param buffer       String buffer.
+ * @param max_size     Maximum size of string buffer.
+ * @return             True if the error was copied successfuly,
+ *                     false otherwise.
+ */
+stock bool json_get_last_error(char[] buffer, int max_size)
+{
+    return strcopy(buffer, max_size, g_jsonLastError) > 0;
+}