1 files changed, 112 insertions, 0 deletions
diff --git a/src/core/channel/channel_args.c b/src/core/channel/channel_args.c
new file mode 100644
index 0000000000..36312e54de
--- /dev/null
+++ b/src/core/channel/channel_args.c
@@ -0,0 +1,112 @@
+/*
+ *
+ * Copyright 2014, Google Inc.
+ * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * 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.
+ *
+ */
+
+#include <grpc/grpc.h>
+#include "src/core/channel/channel_args.h"
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/string.h>
+
+#include <string.h>
+
+static grpc_arg copy_arg(const grpc_arg *src) {
+  grpc_arg dst;
+  dst.type = src->type;
+  dst.key = gpr_strdup(src->key);
+  switch (dst.type) {
+    case GRPC_ARG_STRING:
+      dst.value.string = gpr_strdup(src->value.string);
+      break;
+    case GRPC_ARG_INTEGER:
+      dst.value.integer = src->value.integer;
+      break;
+    case GRPC_ARG_POINTER:
+      dst.value.pointer = src->value.pointer;
+      dst.value.pointer.p = src->value.pointer.copy(src->value.pointer.p);
+      break;
+  }
+  return dst;
+}
+
+grpc_channel_args *grpc_channel_args_copy_and_add(const grpc_channel_args *src,
+                                                  const grpc_arg *to_add) {
+  grpc_channel_args *dst = gpr_malloc(sizeof(grpc_channel_args));
+  size_t i;
+  size_t src_num_args = (src == NULL) ? 0 : src->num_args;
+  if (!src && !to_add) {
+    dst->num_args = 0;
+    dst->args = NULL;
+    return dst;
+  }
+  dst->num_args = src_num_args + ((to_add == NULL) ? 0 : 1);
+  dst->args = gpr_malloc(sizeof(grpc_arg) * dst->num_args);
+  for (i = 0; i < src_num_args; i++) {
+    dst->args[i] = copy_arg(&src->args[i]);
+  }
+  if (to_add != NULL) dst->args[src_num_args] = copy_arg(to_add);
+  return dst;
+}
+
+grpc_channel_args *grpc_channel_args_copy(const grpc_channel_args *src) {
+  return grpc_channel_args_copy_and_add(src, NULL);
+}
+
+void grpc_channel_args_destroy(grpc_channel_args *a) {
+  size_t i;
+  for (i = 0; i < a->num_args; i++) {
+    switch (a->args[i].type) {
+      case GRPC_ARG_STRING:
+        gpr_free(a->args[i].value.string);
+        break;
+      case GRPC_ARG_INTEGER:
+        break;
+      case GRPC_ARG_POINTER:
+        a->args[i].value.pointer.destroy(a->args[i].value.pointer.p);
+        break;
+    }
+    gpr_free(a->args[i].key);
+  }
+  gpr_free(a->args);
+  gpr_free(a);
+}
+
+int grpc_channel_args_is_census_enabled(const grpc_channel_args *a) {
+  int i;
+  if (a == NULL) return 0;
+  for (i = 0; i < a->num_args; i++) {
+    if (0 == strcmp(a->args[i].key, GRPC_ARG_ENABLE_CENSUS)) {
+      return a->args[i].value.integer != 0;
+    }
+  }
+  return 0;
+}