Index: uspace/lib/cpp/include/internal/streambufs.hpp
===================================================================
--- uspace/lib/cpp/include/internal/streambufs.hpp	(revision ccf7a7e26a4b2ec8eef17440304266a7758723c9)
+++ uspace/lib/cpp/include/internal/streambufs.hpp	(revision ccf7a7e26a4b2ec8eef17440304266a7758723c9)
@@ -0,0 +1,170 @@
+/*
+ * Copyright (c) 2017 Jaroslav Jindrak
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef LIBCPP_STREAMBUFS
+#define LIBCPP_STREAMBUFS
+
+#include <iosfwd>
+#include <cstdio>
+#include <streambuf>
+
+namespace std::aux
+{
+    template<class Char, class Traits = char_traits<Char>>
+    class stdin_streambuf : public basic_streambuf<Char, Traits>
+    {
+        public:
+            stdin_streambuf()
+                : basic_streambuf<Char, Traits>{}, buffer_{nullptr}
+            { /* DUMMY BODY */ }
+
+            virtual ~stdin_streambuf()
+            {
+                if (buffer_)
+                    delete[] buffer_;
+            }
+
+        protected:
+            using traits_type = Traits;
+            using char_type   = typename traits_type::char_type;
+            using int_type    = typename traits_type::int_type;
+            using off_type    = typename traits_type::off_type;
+
+            using basic_streambuf<Char, Traits>::input_begin_;
+            using basic_streambuf<Char, Traits>::input_next_;
+            using basic_streambuf<Char, Traits>::input_end_;
+
+            int_type underflow() override
+            {
+                if (!this->gptr())
+                {
+                    buffer_ = new char_type[buf_size_];
+                    input_begin_ = input_next_ = input_end_ = buffer_;
+                }
+
+                off_type i{};
+                if (input_next_ < input_end_)
+                {
+                    auto idx = static_cast<off_type>(input_next_ - input_begin_);
+                    auto count = buf_size_ - idx;
+
+                    for (; i < count; ++i, ++idx)
+                        buffer_[i] = buffer_[idx];
+                }
+
+                for (; i < buf_size_; ++i)
+                {
+                    auto c = fgetc(in_);
+                    putchar(c); // TODO: Temporary source of feedback.
+                    auto ic = traits_type::to_int_type(c);
+                    if (traits_type::eq_int_type(ic, traits_type::eof()))
+                        break;
+
+                    buffer_[i] = c;
+
+                    if (c == '\n')
+                        break;
+                }
+
+                input_next_ = input_begin_;
+                input_end_ = input_begin_ + i;
+
+                if (i == 0)
+                    return traits_type::eof();
+
+                return traits_type::to_int_type(*input_next_);
+            }
+
+            int_type uflow() override
+            {
+                // TODO: what is the difference between uflow and underflow?
+                auto res = underflow();
+                ++*input_next_;
+
+                return res;
+            }
+
+            void imbue(const locale& loc)
+            {
+                this->locale_ = loc;
+            }
+
+        private:
+            FILE* in_{stdin};
+
+            char_type* buffer_;
+
+            static constexpr off_type buf_size_{128};
+    };
+
+    template<class Char, class Traits = char_traits<Char>>
+    class stdout_streambuf: public basic_streambuf<Char, Traits>
+    {
+        public:
+            stdout_streambuf()
+                : basic_streambuf<Char, Traits>{}
+            { /* DUMMY BODY */ }
+
+            virtual ~stdout_streambuf()
+            { /* DUMMY BODY */ }
+
+        protected:
+            using traits_type = Traits;
+            using char_type   = typename traits_type::char_type;
+            using int_type    = typename traits_type::int_type;
+            using off_type    = typename traits_type::off_type;
+
+            int_type overflow(int_type c = traits_type::eof()) override
+            {
+                if (!traits_type::eq_int_type(c, traits_type::eof()))
+                {
+                    auto cc = traits_type::to_char_type(c);
+                    fwrite(&cc, sizeof(char_type), 1, out_);
+                }
+
+                return traits_type::not_eof(c);
+            }
+
+            streamsize xsputn(const char_type* s, streamsize n) override
+            {
+                return fwrite(s, sizeof(char_type), n, out_);
+            }
+
+            int sync() override
+            {
+                if (fflush(out_))
+                    return -1;
+                return 0;
+            }
+
+        private:
+            FILE* out_{stdout};
+    };
+}
+
+#endif