SD card file generation issue

-1 Hi i am currently working on TMS570 Series controller and working on SD card file generation . I am facing hurdle in this problem statement To save the data in a SD card, it must create a text file. During file creation, a new file must be created with an ascending order of number if there was another file with the same name. Note: all the data must be saved in that file for one operation i.e. period of time unit is in ON operation. The fATFS library i used in this project is from elm-chan.org. I tried to code snippet i was attempting to work on its not incrementing the file . Can you please help me out?