Add client functionality to helper tool.
diff --git a/tool/args.cc b/tool/args.cc
new file mode 100644
index 0000000..1882de0
--- /dev/null
+++ b/tool/args.cc
@@ -0,0 +1,73 @@
+/* Copyright (c) 2014, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#include <string>
+#include <vector>
+#include <map>
+
+#include <string.h>
+
+#include "internal.h"
+
+
+bool ParseKeyValueArguments(std::map<std::string, std::string> *out_args,
+ const std::vector<std::string> &args,
+ const struct argument *templates) {
+ out_args->clear();
+
+ for (size_t i = 0; i < args.size(); i++) {
+ const std::string &arg = args[i];
+ const struct argument *templ = nullptr;
+ for (size_t j = 0; templates[j].name[0] != 0; j++) {
+ if (strcmp(arg.c_str(), templates[j].name) == 0) {
+ templ = &templates[j];
+ break;
+ }
+ }
+
+ if (templ == nullptr) {
+ fprintf(stderr, "Unknown argument: %s\n", arg.c_str());
+ return false;
+ }
+
+ if (i + 1 >= args.size()) {
+ fprintf(stderr, "Missing argument for option: %s\n", arg.c_str());
+ return false;
+ }
+
+ if (out_args->find(arg) != out_args->end()) {
+ fprintf(stderr, "Duplicate value given for: %s\n", arg.c_str());
+ return false;
+ }
+
+ (*out_args)[arg] = args[++i];
+ }
+
+ for (size_t j = 0; templates[j].name[0] != 0; j++) {
+ const struct argument *templ = &templates[j];
+ if (templ->required && out_args->find(templ->name) == out_args->end()) {
+ fprintf(stderr, "Missing value for required argument: %s\n", templ->name);
+ return false;
+ }
+ }
+
+ return true;
+}
+
+void PrintUsage(const struct argument *templates) {
+ for (size_t i = 0; templates[i].name[0] != 0; i++) {
+ const struct argument *templ = &templates[i];
+ fprintf(stderr, "%s\t%s\n", templ->name, templ->description);
+ }
+}
