add syntax for checking versions

1 files changed, 56 insertions, 0 deletions

diff --git a/src/version.cc b/src/version.cc
new file mode 100644
index 0000000..7e805c1
--- /dev/null
+++ b/src/version.cc
@@ -0,0 +1,56 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "version.h"
+
+#include <stdlib.h>
+
+#include "util.h"
+
+const char* kNinjaVersion = "1.1.0.git";
+
+void ParseVersion(const string& version, int* major, int* minor) {
+  size_t end = version.find('.');
+  *major = atoi(version.substr(0, end).c_str());
+  *minor = 0;
+  if (end != string::npos) {
+    size_t start = end + 1;
+    end = version.find(start, '.');
+    *minor = atoi(version.substr(start, end).c_str());
+  }
+}
+
+void CheckNinjaVersion(const string& version) {
+  int bin_major, bin_minor;
+  ParseVersion(kNinjaVersion, &bin_major, &bin_minor);
+  int file_major, file_minor;
+  ParseVersion(version, &file_major, &file_minor);
+
+  if (bin_major > file_major) {
+    Warning("ninja executable version (%s) greater than build file "
+            "ninja_required_version (%s); versions may be incompatible.",
+            kNinjaVersion, version.c_str());
+    return;
+  }
+
+  if ((bin_major == file_major && bin_minor < file_minor) ||
+      bin_major < file_major) {
+    Fatal("ninja version (%s) incompatible with build file "
+          "ninja_required_version version (%s).",
+          kNinjaVersion, version.c_str());
+  }
+}
+
+
+