added logging module and a sandbox project

source/core/utils/file.cpp

@@ -0,0 +1,83 @@
+#include "matador/utils/file.hpp"
+#include "matador/utils/os.hpp"
+
+#include <stdexcept>
+
+namespace matador {
+
+file::file(const char *path, const char *mode)
+  : file(std::string(path), mode)
+{}
+
+file::file(const std::string &path, const char *mode)
+{
+  open(path, mode);
+}
+
+file::~file()
+{
+  close();
+}
+
+void file::open(const char *path, const char *mode)
+{
+  open(std::string(path), mode);
+}
+
+void file::open(const std::string &path, const char *mode)
+{
+  close();
+  path_ = path;
+  stream_ = os::fopen(path, mode);
+}
+
+void file::close()
+{
+  if (stream_ != nullptr) {
+    os::fclose(stream_);
+    stream_ = nullptr;
+  }
+}
+
+size_t file::size() const
+{
+  return os::file_size(stream_);
+}
+
+std::string file::path() const
+{
+  return path_;
+}
+
+FILE *file::stream() const
+{
+  return stream_;
+}
+
+bool file::is_open() const
+{
+  return stream_ != nullptr;
+}
+
+std::string read_as_text(const file &f)
+{
+  if (!f.is_open()) {
+    throw std::logic_error("file is not open");
+  }
+
+// get file size:
+  fseek (f.stream() , 0 , SEEK_END);
+  const size_t size = ftell(f.stream());
+  rewind (f.stream());
+
+  std::string result(size, '\0');
+
+  if (const auto ret = fread((result.data()), 1, size, f.stream()); ret == 0 && ferror(f.stream())) {
+    char error_buffer[1024];
+    os::strerror(errno, error_buffer, 1024);
+    throw std::logic_error(error_buffer);
+  }
+
+  return result;
+}
+}