Update develop (#5)

* refactor

host/online_compile/hip_utility/exec_utils.cpp

@@ -0,0 +1,93 @@
+/*******************************************************************************
+ *
+ * MIT License
+ *
+ * Copyright (c) 2019 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ *******************************************************************************/
+#include <exec_utils.hpp>
+#include <manage_ptr.hpp>
+#include <istream>
+#include <ostream>
+#include <string>
+#include <cstdio>
+#include <array>
+#include <cassert>
+
+#ifdef __linux__
+#include <unistd.h>
+#include <cstdio>
+#include <sys/wait.h>
+#endif // __linux__
+
+namespace online_compile {
+namespace exec {
+
+int Run(const std::string& p, std::istream* in, std::ostream* out)
+{
+#ifdef __linux__
+    const auto redirect_stdin  = (in != nullptr);
+    const auto redirect_stdout = (out != nullptr);
+
+    assert(!(redirect_stdin && redirect_stdout));
+
+    const auto file_mode = redirect_stdout ? "r" : "w";
+    OLC_MANAGE_PTR(FILE*, pclose) pipe{popen(p.c_str(), file_mode)};
+
+    if(!pipe)
+        throw std::runtime_error("online_compile::exec::Run(): popen(" + p + ", " + file_mode +
+                                 ") failed");
+
+    if(redirect_stdin || redirect_stdout)
+    {
+        std::array<char, 1024> buffer{};
+
+        if(redirect_stdout)
+        {
+            while(feof(pipe.get()) == 0)
+                if(fgets(buffer.data(), buffer.size(), pipe.get()) != nullptr)
+                    *out << buffer.data();
+        }
+        else
+        {
+            while(!in->eof())
+            {
+                in->read(buffer.data(), buffer.size() - 1);
+                buffer[in->gcount()] = 0;
+
+                if(fputs(buffer.data(), pipe.get()) == EOF)
+                    throw std::runtime_error("online_compile::exec::Run(): fputs() failed");
+            }
+        }
+    }
+
+    auto status = pclose(pipe.release());
+    return WEXITSTATUS(status);
+#else
+    (void)p;
+    (void)in;
+    (void)out;
+    return -1;
+#endif // __linux__
+}
+
+} // namespace exec
+} // namespace online_compile