Index: uspace/lib/cpp/include/impl/locale.hpp
===================================================================
--- uspace/lib/cpp/include/impl/locale.hpp	(revision a3067afa8c852dc82e10c1be9bb506f895e198c0)
+++ uspace/lib/cpp/include/impl/locale.hpp	(revision 0b4b81c863b44dffd1639ac4f06af79bb4b2bd12)
@@ -30,10 +30,991 @@
 #define LIBCPP_LOCALE
 
+#include <cctype>
+#include <cstdlib>
+#include <iosfwd>
+#include <string>
+
 namespace std
 {
+
+    /**
+     * Note: This is a very simplistic implementation of <locale>.
+     *       We have a single locale that has all of its facets.
+     *       This should behave correctly on the outside but will prevent
+     *       us from using multiple locales so if that becomes necessary
+     *       in the future, TODO: implement :)
+     */
+
+    namespace aux
+    {
+        class facet
+        {
+            protected:
+                explicit facet(size_t refs = 0);
+
+                virtual ~facet();
+
+                facet(const facet&) = delete;
+                void operator=(const facet&) = delete;
+        };
+
+        class id
+        {
+            public:
+                id() = default;
+
+                id(const id&) = delete;
+                void operator=(const id&) = delete;
+        };
+    }
+
+    /**
+     * 22.4.1, the type category:
+     */
+
+    class ctype_base
+    {
+        public:
+            using mask = uint16_t;
+
+            static constexpr mask space  = 0b00'0000'0001;
+            static constexpr mask print  = 0b00'0000'0010;
+            static constexpr mask cntrl  = 0b00'0000'0100;
+            static constexpr mask upper  = 0b00'0000'1000;
+            static constexpr mask lower  = 0b00'0001'0000;
+            static constexpr mask alpha  = 0b00'0010'0000;
+            static constexpr mask digit  = 0b00'0100'0000;
+            static constexpr mask punct  = 0b00'1000'0000;
+            static constexpr mask xdigit = 0b01'0000'0000;
+            static constexpr mask blank  = 0b10'0000'0000;
+            static constexpr mask alnum  = alpha | digit;
+            static constexpr mask graph  = alnum | punct;
+    };
+
+    /**
+     * 22.4.1.1, class template ctype:
+     */
+
+    template<class Char>
+    class ctype: public aux::facet, public ctype_base
+    {
+        public:
+            using char_type = Char;
+
+            explicit ctype(size_t)
+            { /* DUMMY BODY */ }
+
+            bool is(mask m, char_type c) const
+            {
+                return do_is(m, c);
+            }
+
+            const char_type* is(const char_type* low, const char_type* high,
+                                mask* vec) const
+            {
+                return do_is(low, high, vec);
+            }
+
+            const char_type* scan_is(mask m, const char_type* low,
+                                     const char_type* high) const
+            {
+                return do_scan_is(m, low, high);
+            }
+
+            const char_type* scan_not(mask m, const char_type* low,
+                                      const char_type* high) const
+            {
+                return do_scan_not(m, low, high);
+            }
+
+            char_type toupper(char_type c) const
+            {
+                return do_toupper(c);
+            }
+
+            const char_type* toupper(char_type* low, const char_type* high) const
+            {
+                return do_toupper(low, high);
+            }
+
+            char_type tolower(char_type c) const
+            {
+                return do_tolower(c);
+            }
+
+            const char_type* tolower(char_type* low, const char_type* high) const
+            {
+                return do_tolower(low, high);
+            }
+
+            char_type widen(char c) const
+            {
+                return do_widen(c);
+            }
+
+            const char_type* widen(const char* low, const char* high, char_type* to) const
+            {
+                return do_widen(low, high, to);
+            }
+
+            char narrow(char_type c, char def) const
+            {
+                return do_narrow(c, def);
+            }
+
+            const char_type* narrow(const char_type* low, const char_type* high,
+                                    char def, char* to) const
+            {
+                return do_narrow(low, high, def, to);
+            }
+
+            static aux::id id;
+
+            /**
+             * Note: This is a deviation from the standard, because in the
+             *       ISO C++ Standard this function is protected (because
+             *       the instances are reference counted, but in our design
+             *       they are not and as such we did this change).
+             *       (This applies to all constructors of all facets.)
+             */
+            ~ctype() = default;
+
+        protected:
+            virtual bool do_is(mask m, char_type c) const
+            {
+                // TODO: implement
+                return false;
+            }
+
+            virtual const char_type* do_is(const char_type* low, const char_type high,
+                                           mask m) const
+            {
+                // TODO: implement
+                return high;
+            }
+
+            virtual const char_type* do_scan_is(mask m, const char_type* low,
+                                                const char_type* high) const
+            {
+                // TODO: implement
+                return high;
+            }
+
+            virtual const char_type* do_scan_not(mask m, const char_type* low,
+                                                 const char_type* high) const
+            {
+                // TODO: implement
+                return low;
+            }
+
+            virtual char_type do_toupper(char_type c) const
+            {
+                // TODO: implement
+                return c;
+            }
+
+            virtual const char_type* do_toupper(char_type* low, const char_type* high) const
+            {
+                // TODO: implement
+                return high;
+            }
+
+            virtual char_type do_tolower(char_type c) const
+            {
+                // TODO: implement
+                return c;
+            }
+
+            virtual const char_type* do_tolower(char_type* low, const char_type* high) const
+            {
+                // TODO: implement
+                return high;
+            }
+
+            virtual char_type do_widen(char c) const
+            {
+                // TODO: implement
+                return c;
+            }
+
+            virtual const char_type* do_widen(const char* low, const char* high,
+                                              char_type* dest) const
+            {
+                // TODO: implement
+                return high;
+            }
+
+            virtual char do_narrow(char_type c, char def) const
+            {
+                // TODO: implement
+                return c;
+            }
+
+            virtual const char_type* do_narrow(const char_type* low, const char_type* high,
+                                               char def, char* dest) const
+            {
+                // TODO: implement
+                return high;
+            }
+    };
+
+    template<class Char>
+    aux::id ctype<Char>::id{};
+
+    /**
+     * 22.4.1.2, class template ctype_byname:
+     * Note: Dummy, TODO: implement.
+     */
+
+    template<class Char>
+    class ctype_byname: public ctype<Char>
+    {
+        public:
+            using mask = typename ctype<Char>::mask;
+
+            explicit ctype_byname(const char* name, size_t = 0)
+            { /* DUMMY BODY */ }
+
+            explicit ctype_byname(const string& name, size_t = 0)
+            { /* DUMMY BODY */ }
+
+        protected:
+            ~ctype_byname() = default;
+    };
+
+    /**
+     * 22.4.1.3, ctype specialziations:
+     */
+
+    template<>
+    class ctype<char>: public aux::facet, public ctype_base
+    {
+        public:
+            using char_type = char;
+
+            explicit ctype(const mask* tab = nullptr, bool del = false, size_t = 0)
+            { /* DUMMY BODY */ }
+
+            bool is(mask m, char_type c) const
+            {
+                return do_is(m, c);
+            }
+
+            const char_type* is(const char_type* low, const char_type* high,
+                                mask* vec) const
+            {
+                return do_is(low, high, vec);
+            }
+
+            const char_type* scan_is(mask m, const char_type* low,
+                                     const char_type* high) const
+            {
+                return do_scan_is(m, low, high);
+            }
+
+            const char_type* scan_not(mask m, const char_type* low,
+                                      const char_type* high) const
+            {
+                return do_scan_not(m, low, high);
+            }
+
+            char_type toupper(char_type c) const
+            {
+                return do_toupper(c);
+            }
+
+            const char_type* toupper(char_type* low, const char_type* high) const
+            {
+                return do_toupper(low, high);
+            }
+
+            char_type tolower(char_type c) const
+            {
+                return do_tolower(c);
+            }
+
+            const char_type* tolower(char_type* low, const char_type* high) const
+            {
+                return do_tolower(low, high);
+            }
+
+            char_type widen(char c) const
+            {
+                return do_widen(c);
+            }
+
+            const char_type* widen(const char* low, const char* high, char_type* to) const
+            {
+                return do_widen(low, high, to);
+            }
+
+            char narrow(char_type c, char def) const
+            {
+                return do_narrow(c, def);
+            }
+
+            const char_type* narrow(const char_type* low, const char_type* high,
+                                    char def, char* to) const
+            {
+                return do_narrow(low, high, def, to);
+            }
+
+            static aux::id id;
+            static const size_t table_size{0};
+
+            const mask* table() const noexcept
+            {
+                return classic_table();
+            }
+
+            static const mask* classic_table() noexcept
+            {
+                return classic_table_;
+            }
+
+            ~ctype() = default;
+
+        protected:
+            virtual bool do_is(mask m, char_type c) const
+            {
+                // TODO: implement, this is a dummy
+                if ((m & space) != 0 && std::isspace(c))
+                    return true;
+                else if ((m & alpha) != 0 && std::isalpha(c))
+                    return true;
+                else if ((m & upper) != 0 && std::isupper(c))
+                    return true;
+                else if ((m & lower) != 0 && std::islower(c))
+                    return true;
+                else if ((m & digit) != 0 && std::isdigit(c))
+                    return true;
+                return false;
+            }
+
+            virtual const char_type* do_is(const char_type* low, const char_type* high,
+                                           mask* m) const
+            {
+                // TODO: implement
+                return high;
+            }
+
+            virtual const char_type* do_scan_is(mask m, const char_type* low,
+                                                const char_type* high) const
+            {
+                // TODO: implement
+                return high;
+            }
+
+            virtual const char_type* do_scan_not(mask m, const char_type* low,
+                                                 const char_type* high) const
+            {
+                // TODO: implement
+                return high;
+            }
+
+            virtual char_type do_toupper(char_type c) const
+            {
+                return std::toupper(c);
+            }
+
+            virtual const char_type* do_toupper(char_type* low, const char_type* high) const
+            {
+                while (low != high)
+                    *low = std::toupper(*low);
+
+                return high;
+            }
+
+            virtual char_type do_tolower(char_type c) const
+            {
+                return std::tolower(c);
+            }
+
+            virtual const char_type* do_tolower(char_type* low, const char_type* high) const
+            {
+                while (low != high)
+                    *low = std::tolower(*low);
+
+                return high;
+            }
+
+            virtual char_type do_widen(char c) const
+            {
+                return c;
+            }
+
+            virtual const char_type* do_widen(const char* low, const char* high,
+                                              char_type* dest) const
+            {
+                while (low != high)
+                    *dest++ = *low++;
+
+                return high;
+            }
+
+            virtual char do_narrow(char_type c, char def) const
+            {
+                return c;
+            }
+
+            virtual const char_type* do_narrow(const char_type* low, const char_type* high,
+                                               char def, char* dest) const
+            {
+                while (low != high)
+                    *dest++ = *low++;
+
+                return high;
+            }
+
+        private:
+            static constexpr mask* classic_table_{nullptr};
+    };
+
+    template<>
+    class ctype<wchar_t>: public aux::facet, public ctype_base
+    {
+        public:
+            using char_type = wchar_t;
+
+            explicit ctype(const mask* tab = nullptr, bool del = false, size_t = 0)
+            { /* DUMMY BODY */ }
+
+            bool is(mask m, char_type c) const
+            {
+                return do_is(m, c);
+            }
+
+            const char_type* is(const char_type* low, const char_type* high,
+                                mask* vec) const
+            {
+                return do_is(low, high, vec);
+            }
+
+            const char_type* scan_is(mask m, const char_type* low,
+                                     const char_type* high) const
+            {
+                return do_scan_is(m, low, high);
+            }
+
+            const char_type* scan_not(mask m, const char_type* low,
+                                      const char_type* high) const
+            {
+                return do_scan_not(m, low, high);
+            }
+
+            char_type toupper(char_type c) const
+            {
+                return do_toupper(c);
+            }
+
+            const char_type* toupper(char_type* low, const char_type* high) const
+            {
+                return do_toupper(low, high);
+            }
+
+            char_type tolower(char_type c) const
+            {
+                return do_tolower(c);
+            }
+
+            const char_type* tolower(char_type* low, const char_type* high) const
+            {
+                return do_tolower(low, high);
+            }
+
+            char_type widen(char c) const
+            {
+                return do_widen(c);
+            }
+
+            const char_type* widen(const char* low, const char* high, char_type* to) const
+            {
+                return do_widen(low, high, to);
+            }
+
+            char narrow(char_type c, char def) const
+            {
+                return do_narrow(c, def);
+            }
+
+            const char_type* narrow(const char_type* low, const char_type* high,
+                                    char def, char* to) const
+            {
+                return do_narrow(low, high, def, to);
+            }
+
+            static aux::id id;
+            static const size_t table_size{0};
+
+            const mask* table() const noexcept
+            {
+                return classic_table();
+            }
+
+            static const mask* classic_table() noexcept
+            {
+                return classic_table_;
+            }
+
+            ~ctype() = default;
+
+        protected:
+            virtual bool do_is(mask m, char_type c) const
+            {
+                // TODO: implement
+                return false;
+            }
+
+            virtual const char_type* do_is(const char_type* low, const char_type* high,
+                                           mask* m) const
+            {
+                // TODO: implement
+                return high;
+            }
+
+            virtual const char_type* do_scan_is(mask m, const char_type* low,
+                                                const char_type* high) const
+            {
+                // TODO: implement
+                return high;
+            }
+
+            virtual const char_type* do_scan_not(mask m, const char_type* low,
+                                                 const char_type* high) const
+            {
+                // TODO: implement
+                return high;
+            }
+
+            virtual char_type do_toupper(char_type c) const
+            {
+                // TODO: implement
+                return c;
+            }
+
+            virtual const char_type* do_toupper(char_type* low, const char_type* high) const
+            {
+                // TODO: implement
+                return high;
+            }
+
+            virtual char_type do_tolower(char_type c) const
+            {
+                // TODO: implement
+                return c;
+            }
+
+            virtual const char_type* do_tolower(char_type* low, const char_type* high) const
+            {
+                // TODO: implement
+                return high;
+            }
+
+            virtual char_type do_widen(char c) const
+            {
+                // TODO: implement
+                return c;
+            }
+
+            virtual const char_type* do_widen(const char* low, const char* high,
+                                              char_type* dest) const
+            {
+                // TODO: implement
+                return dest;
+            }
+
+            virtual char do_narrow(char_type c, char def) const
+            {
+                // TODO: implement
+                return c;
+            }
+
+            virtual const char_type* do_narrow(const char_type* low, const char_type* high,
+                                               char def, char* dest) const
+            {
+                // TODO: implement
+                return high;
+            }
+
+        private:
+            static constexpr mask* classic_table_{nullptr};
+    };
+
+    /**
+     * 22.4.1.4, class template codecvt:
+     */
+
+    class codecvt_base
+    {
+        public:
+            enum result
+            {
+                ok, partial, error, noconv
+            };
+    };
+
+    template<class Intern, class Extern, class State>
+    class codecvt: public codecvt_base
+    {
+        public:
+            using intern_type = Intern;
+            using extern_type = Extern;
+            using state_type  = State;
+
+            explicit codecvt(size_t = 0)
+            { /* DUMMY BODY */ }
+
+            result out(state_type& state, const intern_type* from, const intern_type* from_end,
+                       const intern_type*& from_next, extern_type* to, extern_type* to_end,
+                       extern_type*& to_next) const
+            {
+                return do_out(state, from, from_end, from_next, to, to_end, to_next);
+            }
+
+            result unshift(state_type& state, extern_type* to, extern_type* to_end,
+                           extern_type*& to_next) const
+            {
+                return do_unshift(state, to, to_end, to_next);
+            }
+
+            result in(state_type& state, const extern_type* from, const extern_type* from_end,
+                      const extern_type*& from_next, intern_type* to, intern_type* to_end,
+                      intern_type*& to_next) const
+            {
+                return do_in(state, from, from_end, from_next, to, to_end, to_next);
+            }
+
+            int encoding() const noexcept
+            {
+                return do_encoding();
+            }
+
+            bool always_noconv() const noexcept
+            {
+                return do_always_noconv();
+            }
+
+            int length(state_type& state, const extern_type* from, const extern_type* end,
+                       size_t max) const
+            {
+                return do_length(state, from, end, max);
+            }
+
+            int max_length() const noexcept
+            {
+                return do_max_length();
+            }
+
+            static aux::id id;
+
+            ~codecvt() = default;
+
+        protected:
+            virtual result do_out(state_type& state, const intern_type* from, const intern_type* from_end,
+                                  const intern_type*& from_next, extern_type* to, extern_type* to_end,
+                                  extern_type*& to_next) const
+            {
+                // TODO: implement
+                return error;
+            }
+
+            virtual result do_unshift(state_type& state, extern_type* to, extern_type* to_end,
+                                      extern_type*& to_next) const
+            {
+                // TODO: implement
+                return error;
+            }
+
+            virtual result do_in(state_type& state, const extern_type* from, const extern_type* from_end,
+                                 const extern_type*& from_next, intern_type* to, intern_type* to_end,
+                                 intern_type*& to_next) const
+            {
+                // TODO: implement
+                return error;
+            }
+
+            virtual int do_encoding() const noexcept
+            {
+                // TODO: implement
+                return 0;
+            }
+
+            virtual bool do_always_noconv() const noexcept
+            {
+                // TODO: implement
+                return false;
+            }
+
+            virtual int do_length(state_type& state, const extern_type* from, const extern_type* end,
+                                  size_t max) const
+            {
+                // TODO: implement
+                return 0;
+            }
+
+            virtual int do_max_length() const noexcept
+            {
+                // TODO: implement
+                return 0;
+            }
+    };
+
+    template<class Intern, class Extern, class State>
+    aux::id codecvt<Intern, Extern, State>::id{};
+
+    /**
+     * 22.4.1.5, class template codecvt_byname:
+     * Note: Dummy, TODO: implement.
+     */
+
+    template<class Intern, class Extern, class State>
+    class codecvt_byname: public codecvt<Intern, Extern, State>
+    {
+        public:
+            explicit codecvt_byname(const char*, size_t = 0)
+            { /* DUMMY BODY */ }
+
+            explicit codecvt_byname(const string&, size_t = 0)
+            { /* DUMMY BODY */ }
+
+            ~codecvt_byname() = default;
+    };
+
+    /**
+     * 22.3.1, class locale:
+     */
+
     class locale
     {
-        // TODO: implement
+        public:
+            using facet = aux::facet;
+            using id    = aux::id;
+
+            using category = int;
+
+            static const category none     = 0b000'0001;
+            static const category collate  = 0b000'0010;
+            static const category ctype    = 0b000'0100;
+            static const category monetary = 0b000'1000;
+            static const category numeric  = 0b001'0000;
+            static const category time     = 0b010'0000;
+            static const category messages = 0b100'0000;
+            static const category all      = collate | ctype | monetary |
+                                             numeric | time | messages;
+
+            locale() noexcept;
+
+            locale(const locale& other) noexcept;
+
+            explicit locale(const char* name);
+
+            explicit locale(const string& name);
+
+            locale(const locale& other, const char* name, category);
+
+            locale(const locale& other, const string& name, category);
+
+            template<class Facet>
+            locale(const locale& other, Facet* f)
+                : name_{other.name_}
+            { /* DUMMY BODY */ }
+
+            locale(const locale& other, const locale& one, category);
+
+            ~locale() = default;
+
+            const locale& operator=(const locale& other) noexcept;
+
+            template<class Facet>
+            locale combine(const locale& other) const
+            {
+                return other;
+            }
+
+            string name() const;
+
+            bool operator==(const locale& other) const;
+            bool operator!=(const locale& other) const;
+
+            template<class Char, class Traits, class Allocator>
+            bool operator()(const basic_string<Char, Traits, Allocator>& s1,
+                            const basic_string<Char, Traits, Allocator>& s2) const
+            {
+                // TODO: define outside locale
+                /* return use_facet<collate<Char>>(*this).compare( */
+                /*     s1.begin(), s1.end(), s2.begin(), s2.end() */
+                /* ) < 0; */
+                return false;
+            }
+
+            static locale global(const locale&)
+            {
+                return *the_locale_;
+            }
+
+            static const locale& classic()
+            {
+                return *the_locale_;
+            }
+
+        private:
+            string name_;
+
+            // TODO: implement the_locale_
+            static constexpr locale* the_locale_{nullptr};
+
+            template<class Facet>
+            friend bool has_facet(const locale&);
+
+            template<class Facet>
+            bool has_()
+            { // Our single locale atm has all facets.
+                return true;
+            }
+
+            template<class Facet>
+            friend const Facet& use_facet(const locale&);
+
+            /**
+             * Note: We store all of the facets in the main
+             *       locale.
+             */
+
+            template<class Facet>
+            const Facet& get_();
+
+            std::ctype<char> ctype_char_{};
+            std::ctype<wchar_t> ctype_wchar_{};
     };
+
+    template<>
+    const ctype<char>& locale::get_<ctype<char>>()
+    {
+        return ctype_char_;
+    }
+
+    template<>
+    const ctype<wchar_t>& locale::get_<ctype<wchar_t>>()
+    {
+        return ctype_wchar_;
+    }
+
+    template<class Facet>
+    const Facet& use_facet(const locale& loc)
+    {
+        return loc.get_<Facet>();
+    }
+
+    template<class Facet>
+    bool has_facet(const locale& loc)
+    {
+        return loc.has_<Facet>();
+    }
+
+    /**
+     * 22.3.3, convenience interfaces:
+     */
+
+    /**
+     * 22.3.3.1, character classification:
+     */
+
+    template<class Char>
+    bool isspace(Char c, const locale& loc)
+    {
+        return use_facet<ctype<Char>>(loc).is(ctype_base::space, c);
+    }
+
+    template<class Char>
+    bool isprint(Char c, const locale& loc)
+    {
+        return use_facet<ctype<Char>>(loc).is(ctype_base::print, c);
+    }
+
+    template<class Char>
+    bool iscntrl(Char c, const locale& loc)
+    {
+        return use_facet<ctype<Char>>(loc).is(ctype_base::cntrl, c);
+    }
+
+    template<class Char>
+    bool isupper(Char c, const locale& loc)
+    {
+        return use_facet<ctype<Char>>(loc).is(ctype_base::upper, c);
+    }
+
+    template<class Char>
+    bool islower(Char c, const locale& loc)
+    {
+        return use_facet<ctype<Char>>(loc).is(ctype_base::lower, c);
+    }
+
+    template<class Char>
+    bool isalpha(Char c, const locale& loc)
+    {
+        return use_facet<ctype<Char>>(loc).is(ctype_base::alpha, c);
+    }
+
+    template<class Char>
+    bool isdigit(Char c, const locale& loc)
+    {
+        return use_facet<ctype<Char>>(loc).is(ctype_base::digit, c);
+    }
+
+    template<class Char>
+    bool ispunct(Char c, const locale& loc)
+    {
+        return use_facet<ctype<Char>>(loc).is(ctype_base::punct, c);
+    }
+
+    template<class Char>
+    bool isxdigit(Char c, const locale& loc)
+    {
+        return use_facet<ctype<Char>>(loc).is(ctype_base::xdigit, c);
+    }
+
+    template<class Char>
+    bool isalnum(Char c, const locale& loc)
+    {
+        return use_facet<ctype<Char>>(loc).is(ctype_base::alnum, c);
+    }
+
+    template<class Char>
+    bool isgraph(Char c, const locale& loc)
+    {
+        return use_facet<ctype<Char>>(loc).is(ctype_base::graph, c);
+    }
+
+    template<class Char>
+    bool isblank(Char c, const locale& loc)
+    {
+        return use_facet<ctype<Char>>(loc).is(ctype_base::blank, c);
+    }
+
+    /**
+     * 22.3.3.2, conversions:
+     */
+
+    /**
+     * 22.3.3.2.1, character conversions:
+     */
+
+    template<class Char>
+    Char toupper(Char c, const locale& loc)
+    {
+        return use_facet<ctype<Char>>(loc).toupper(c);
+    }
+
+    template<class Char>
+    Char tolower(Char c, const locale& loc)
+    {
+        return use_facet<ctype<Char>>(loc).tolower(c);
+    }
+
+    /**
+     * 22.3.3.2.2, string conversions:
+     */
+
+    // TODO: implement
 }