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+// file : butl/triplet.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#include <butl/triplet>
+
+#include <stdexcept> // invalid_argument
+
+using namespace std;
+
+namespace butl
+{
+ triplet::
+ triplet (const string& s, string* c)
+ {
+ auto bad = [](const char* m) {throw invalid_argument (m);};
+
+ // Find the first and the last components. The first is CPU and the last is
+ // (part of) SYSTEM, that we know for sure.
+ //
+ string::size_type f (s.find ('-')), l (s.rfind ('-'));
+
+ if (f == 0 || f == string::npos)
+ bad ("missing cpu");
+
+ cpu.assign (s, 0, f);
+
+ if (c != nullptr)
+ *c = cpu;
+
+ // If we have something in between, then the first component after CPU is
+ // VENDOR. Unless it is a first component of two-component system, as in
+ // i686-linux-gnu.
+ //
+ if (f != l)
+ {
+ // [f, p) is VENDOR.
+ //
+ string::size_type p (s.find ('-', ++f)), n (p - f);
+
+ if (n == 0)
+ bad ("empty vendor");
+
+ // Do we have all four components? If so, then we don't need to do any
+ // special recognition of two-component systems.
+ //
+ if (l != p)
+ {
+ l = s.rfind ('-', --l);
+
+ if (l != p)
+ bad ("too many components");
+
+ // Handle the none-* case here.
+ //
+ if (s.compare (l + 1, 5, "none-") == 0)
+ l += 5;
+ }
+ else
+ {
+ // See if this is one of the well-known non-vendors.
+ //
+ if (s.compare (f, n, "linux") == 0 ||
+ s.compare (f, n, "kfreebsd") == 0)
+ {
+ l = f - 1;
+ n = 0; // No VENDOR.
+ }
+ }
+
+ // Handle special VENDOR values.
+ //
+ if (n != 0)
+ {
+ if (s.compare (f, n, "pc") != 0 &&
+ s.compare (f, n, "none") != 0 &&
+ s.compare (f, n, "unknown") != 0)
+ {
+ vendor.assign (s, f, n);
+
+ if (c != nullptr)
+ {
+ *c += '-';
+ *c += vendor;
+ }
+ }
+ }
+ }
+
+ // (l, npos) is SYSTEM
+ //
+ system.assign (s, ++l, string::npos);
+
+ if (system.empty ())
+ bad ("missing os/kernel/abi");
+
+ if (system.front () == '-' || system.back () == '-')
+ bad ("invalid os/kernel/abi");
+
+ if (c != nullptr)
+ {
+ *c += '-';
+ *c += system;
+ }
+
+ // Finally, extract VERSION for some recognized systems.
+ //
+ string::size_type v (0);
+ if (system.compare (0, (v = 6), "darwin") == 0 ||
+ system.compare (0, (v = 7), "freebsd") == 0 ||
+ system.compare (0, (v = 7), "openbsd") == 0 ||
+ system.compare (0, (v = 7), "netbsd") == 0 ||
+ system.compare (0, (v = 7), "solaris") == 0 ||
+ system.compare (0, (v = 7), "aix") == 0 ||
+ system.compare (0, (v = 7), "hpux") == 0)
+ {
+ version.assign (system, v, string::npos);
+ system.resize (system.size () - version.size ());
+ }
+ }
+}