From 9fb791e9fad6c63fc1dac49f4d05ae63b8a3db9b Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 5 Jan 2016 11:55:15 +0200
Subject: Rename build directory/namespace to build2

---
 build2/utility.cxx | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 build2/utility.cxx

(limited to 'build2/utility.cxx')

diff --git a/build2/utility.cxx b/build2/utility.cxx
new file mode 100644
index 0000000..fcecb5b
--- /dev/null
+++ b/build2/utility.cxx
@@ -0,0 +1,94 @@
+// file      : build2/utility.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <build2/utility>
+
+#include <cstdlib> // strtol()
+
+using namespace std;
+
+namespace build2
+{
+  const string empty_string;
+  const path empty_path;
+  const dir_path empty_dir_path;
+
+  unsigned int
+  to_version (const string& s)
+  {
+    // See tests/version.
+    //
+
+    auto parse = [&s] (size_t& p, const char* m, long min = 0, long max = 99)
+      -> unsigned int
+    {
+      if (s[p] == '-' || s[p] == '+') // stoi() allows these.
+        throw invalid_argument (m);
+
+      const char* b (s.c_str () + p);
+      char* e;
+      long r (strtol (b, &e, 10));
+
+      if (b == e || r < min || r > max)
+        throw invalid_argument (m);
+
+      p = e - s.c_str ();
+      return static_cast<unsigned int> (r);
+    };
+
+    auto bail = [] (const char* m) {throw invalid_argument (m);};
+
+    unsigned int ma, mi, bf, ab (0);
+
+    size_t p (0), n (s.size ());
+    ma = parse (p, "invalid major version");
+
+    if (p >= n || s[p] != '.')
+      bail ("'.' expected after major version");
+
+    mi = parse (++p, "invalid minor version");
+
+    if (p >= n || s[p] != '.')
+      bail ("'.' expected after minor version");
+
+    bf = parse (++p, "invalid bugfix version");
+
+    if (p < n)
+    {
+      if (s[p] != '-')
+        bail ("'-' expected after bugfix version");
+
+      char k (s[++p]);
+
+      if (k != 'a' && k != 'b')
+        bail ("'a' or 'b' expected in release component");
+
+      ab = parse (++p, "invalid release component", 1, 49);
+
+      if (p != n)
+        bail ("junk after release component");
+
+      if (k == 'b')
+        ab += 50;
+    }
+
+    //                  AABBCCDD
+    unsigned int r (ma * 1000000U +
+                    mi *   10000U +
+                    bf *     100U);
+
+    if (ab != 0)
+    {
+      if (r == 0)
+        bail ("0.0.0 version with release component");
+
+      r -= 100;
+      r += ab;
+    }
+
+    return r;
+  }
+
+  bool exception_unwinding_dtor = false;
+}
-- 
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