badge/fahrplan.c

   1 #include "fahrplan.h"
   2 #include "ui/browser.h"
   3
   4 #include <drivers/fatfs/ff.h>
   5
   6 #define FAHRPLAN_PATH     "/fahrplan"
   7 #define FAHRPLAN_MENUFILE "fahrplan.lst"
   8 #define FAHRPLAN_POSFILE  "selected.dat"
   9
  10 static size_t badge_load_fahrplan_pos(void) {
  11   size_t pos = 0;
  12   FIL fd;
  13
  14   if(FR_OK == f_open(&fd, FAHRPLAN_POSFILE, FA_OPEN_EXISTING | FA_READ)) {
  15     UINT bytes;
  16     size_t buf;
  17     if(FR_OK == f_read(&fd, &buf, sizeof(buf), &bytes) && bytes == sizeof(buf)) {
  18       pos = buf;
  19     }
  20
  21     f_close(&fd);
  22   }
  23
  24   return pos;
  25 }
  26
  27 static void badge_save_fahrplan_pos(size_t pos) {
  28   FIL fd;
  29
  30   if(FR_OK == f_open(&fd, FAHRPLAN_POSFILE, FA_CREATE_ALWAYS | FA_WRITE)) {
  31     UINT bytes;
  32     f_write(&fd, &pos, sizeof(pos), &bytes);
  33     f_close(&fd);
  34   }
  35 }
  36
  37 void badge_fahrplan(void) {
  38   f_chdir(FAHRPLAN_PATH);
  39
  40   size_t oldpos = badge_load_fahrplan_pos();
  41   size_t pos = oldpos;
  42
  43   badge_browse_textfiles(FAHRPLAN_MENUFILE, &pos);
  44
  45   if(oldpos != pos) {
  46     badge_save_fahrplan_pos(pos);
  47   }
  48 }