+std::string RemoveLastPathComponent(std::string path,
+ std::string *removed, int count)
+{
+ if(removed)
+ *removed = "";
+
+ size_t remaining = path.size();
+
+ for(int i = 0; i < count; ++i){
+ // strip a dir delimiter
+ while(remaining != 0 && IsDirDelimiter(path[remaining-1]))
+ remaining--;
+ // strip a path component
+ size_t component_end = remaining;
+ while(remaining != 0 && !IsDirDelimiter(path[remaining-1]))
+ remaining--;
+ size_t component_start = remaining;
+ // strip a dir delimiter
+ while(remaining != 0 && IsDirDelimiter(path[remaining-1]))
+ remaining--;
+ if(removed){
+ std::string component = path.substr(component_start,
+ component_end - component_start);
+ if(i)
+ *removed = component + DIR_DELIM + *removed;
+ else
+ *removed = component;
+ }
+ }
+ return path.substr(0, remaining);
+}
+
+std::string RemoveRelativePathComponents(std::string path)
+{
+ size_t pos = path.size();
+ size_t dotdot_count = 0;
+ while(pos != 0){
+ size_t component_with_delim_end = pos;
+ // skip a dir delimiter
+ while(pos != 0 && IsDirDelimiter(path[pos-1]))
+ pos--;
+ // strip a path component
+ size_t component_end = pos;
+ while(pos != 0 && !IsDirDelimiter(path[pos-1]))
+ pos--;
+ size_t component_start = pos;
+
+ std::string component = path.substr(component_start,
+ component_end - component_start);
+ bool remove_this_component = false;
+ if(component == "."){
+ remove_this_component = true;
+ }
+ else if(component == ".."){
+ remove_this_component = true;
+ dotdot_count += 1;
+ }
+ else if(dotdot_count != 0){
+ remove_this_component = true;
+ dotdot_count -= 1;
+ }
+
+ if(remove_this_component){
+ while(pos != 0 && IsDirDelimiter(path[pos-1]))
+ pos--;
+ path = path.substr(0, pos) + DIR_DELIM +
+ path.substr(component_with_delim_end,
+ std::string::npos);
+ pos++;
+ }
+ }
+
+ if(dotdot_count > 0)
+ return "";
+
+ // remove trailing dir delimiters
+ pos = path.size();
+ while(pos != 0 && IsDirDelimiter(path[pos-1]))
+ pos--;
+ return path.substr(0, pos);
+}
+
+bool safeWriteToFile(const std::string &path, const std::string &content)
+{
+ std::string tmp_file = path + ".~mt";
+
+ // Write to a tmp file
+ std::ofstream os(tmp_file.c_str(), std::ios::binary);
+ if (!os.good())
+ return false;
+ os << content;
+ os.flush();
+ os.close();
+ if (os.fail()) {
+ remove(tmp_file.c_str());
+ return false;
+ }