Merge pull request diffblue#224 from diffblue/feature/file_utils_add_parsing_of_file_extension

Add parsing of file extension from file path-name.

Author: marek-trtik

src/util/file_util.cpp

@@ -201,6 +201,26 @@ std::string fileutl_parse_name_in_pathname(std::string const &file_pathname)
   return file_pathname.substr(fileutl_parse_last_dir_pos(file_pathname));
 }
 
+std::string fileutl_parse_extension_in_pathname(const std::string &pathname)
+{
+  const std::size_t idx=pathname.find_last_of('.');
+# if defined(WIN32)
+  const std::size_t fwd_slash_idx=pathname.find_last_of('/');
+  const std::size_t bwd_slash_idx=pathname.find_last_of('\\');
+  const std::size_t slash_idx=
+    fwd_slash_idx==std::string::npos ? bwd_slash_idx :
+    bwd_slash_idx==std::string::npos ? fwd_slash_idx :
+      std::max(fwd_slash_idx, bwd_slash_idx);
+# elif defined(__linux__) || defined(__APPLE__)
+  const std::size_t slash_idx=pathname.find_last_of('/');
+# else
+#   error "Unsuported platform."
+# endif
+  return
+    idx==std::string::npos || (slash_idx!=std::string::npos && idx<slash_idx) ?
+      std::string() : pathname.substr(idx);
+}
+
 std::string fileutl_parse_path_in_pathname(std::string const &file_pathname)
 {
   return file_pathname.substr(0U, fileutl_parse_last_dir_pos(file_pathname));

src/util/file_util.h

@@ -35,6 +35,8 @@ uint64_t fileutl_file_size(std::string const &file_pathname);
 
 std::string fileutl_parse_name_in_pathname(std::string const &file_pathname);
 
+std::string fileutl_parse_extension_in_pathname(const std::string &pathname);
+
 std::string fileutl_parse_path_in_pathname(std::string const &file_pathname);
 
 std::string fileutl_remove_extension(std::string const &filename);