--- /dev/null
+/*******************************************************************************
+ Copyright (c) 2016, Michael Wallner <mike@php.net>.
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice,
+ this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*******************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#else
+# include "php_config.h"
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "data.h"
+
+impl_var *init_impl_var(const char *name, int is_reference) {
+ impl_var *var = calloc(1, sizeof(*var));
+ var->name = strdup(name);
+ var->reference = is_reference;
+ return var;
+}
+
+impl_var *copy_impl_var(impl_var *var) {
+ impl_var *cpy = malloc(sizeof(*cpy));
+ memcpy(cpy, var, sizeof(*cpy));
+ cpy->name = strdup(cpy->name);
+ if (cpy->token) {
+ cpy->token = psi_token_copy(cpy->token);
+ }
+ return cpy;
+}
+
+void free_impl_var(impl_var *var) {
+ if (var->token) {
+ free(var->token);
+ }
+ free(var->name);
+ free(var);
+}
+
+impl_arg *locate_impl_var_arg(impl_var *var, impl_args *args) {
+ size_t i;
+
+ for (i = 0; i < args->count; ++i) {
+ impl_arg *iarg = args->args[i];
+
+ if (!strcmp(var->name, iarg->var->name)) {
+ return var->arg = iarg;
+ }
+ }
+
+ return NULL;
+}