badge/jumpnrun/starter.c

   1 #include "jumpnrun.h"
   2 #include "../ui/menu.h"
   3 #include "../ui/browser.h"
   4
   5 #include <drivers/fatfs/ff.h>
   6
   7 #define CREDITSFILE "credits.txt"
   8
   9 enum {
  10   LEVELFILE_MAX        = 12,
  11   LEVELDESCRIPTION_MAX = 14,
  12   MENU_BUFLEN          = LEVELDESCRIPTION_MAX + 1 + LEVELFILE_MAX + 1
  13 };
  14
  15 enum {
  16   CHOICE_LEVEL,
  17   CHOICE_CREDITS,
  18   CHOICE_EXIT,
  19   CHOICE_ERROR
  20 };
  21
  22 #define PROGRESS_FNAME "progress.dat"
  23
  24 static uint8_t jumpnrun_load_progress(void) {
  25   uint8_t progress = 0;
  26   FIL fd;
  27
  28
  29   if(FR_OK == f_chdir(JUMPNRUN_PATH) &&
  30      FR_OK == f_open(&fd, PROGRESS_FNAME, FA_OPEN_EXISTING | FA_READ)) {
  31     UINT bytes;
  32     f_read(&fd, &progress, sizeof(progress), &bytes);
  33     f_close(&fd);
  34   }
  35
  36   return progress;
  37 }
  38
  39 static void jumpnrun_save_progress(uint8_t progress) {
  40   FIL fd;
  41
  42   if(FR_OK == f_chdir(JUMPNRUN_PATH) &&
  43      FR_OK == f_open(&fd, PROGRESS_FNAME, FA_CREATE_ALWAYS | FA_WRITE)) {
  44     UINT bytes;
  45     f_write(&fd, &progress, sizeof(progress), &bytes);
  46     f_close(&fd);
  47   }
  48 }
  49
  50 static uint8_t jumpnrun_pick_level_from_fd(char *buf, size_t *first_visible, size_t *selected, uint8_t progress, FIL *fd) {
  51   unsigned levelcount = 0;
  52
  53   {
  54     char buf[MENU_BUFLEN];
  55     while(f_gets(buf, MENU_BUFLEN, fd) && levelcount <= progress) {
  56       ++levelcount;
  57     }
  58   }
  59
  60   if(FR_OK != f_lseek(fd, 0)) {
  61     return JUMPNRUN_ERROR;
  62   }
  63
  64   size_t menulen   = levelcount + (levelcount <= progress) + 1;
  65
  66   char        menu_buf  [menulen][MENU_BUFLEN];
  67   char const *menu_index[menulen];
  68   char const *fnames    [menulen];
  69   unsigned i;
  70
  71   for(i = 0; i < levelcount && f_gets(menu_buf[i], MENU_BUFLEN, fd); ++i) {
  72     menu_index[i] = menu_buf[i];
  73     char *p;
  74     for(p = menu_buf[i]; *p && *p != '|'; ++p)
  75       ;
  76     if(*p) {
  77       *p++ = '\0';
  78     }
  79     fnames[i] = p;
  80   }
  81
  82   size_t creditspos = -1;
  83   size_t exitpos   = i;
  84
  85   if(levelcount <= progress) {
  86     creditspos = i;
  87     strcpy(menu_buf[creditspos], "Credits");
  88     menu_index[creditspos] = menu_buf[creditspos];
  89
  90     ++exitpos;
  91   }
  92
  93   strcpy(menu_buf[exitpos], "Zurück");
  94   menu_index[exitpos] = menu_buf[exitpos];
  95
  96   size_t choice = badge_menu(menu_index, exitpos + 1, first_visible, *selected);
  97
  98   if(choice == exitpos) {
  99     return CHOICE_EXIT;
 100   }
 101
 102   *selected = choice;
 103
 104   if(choice == creditspos) {
 105     return CHOICE_CREDITS;
 106   }
 107
 108   strncpy(buf, fnames[*selected], LEVELFILE_MAX);
 109   buf[LEVELFILE_MAX] = '\0';
 110
 111   return CHOICE_LEVEL;
 112 }
 113
 114 static uint8_t jumpnrun_pick_level(char *buf, size_t *first_visible, size_t *selected, uint8_t progress) {
 115   FIL fd;
 116
 117   if(FR_OK != f_chdir(JUMPNRUN_PATH) ||
 118      FR_OK != f_open(&fd, "levels.lst", FA_OPEN_EXISTING | FA_READ)) {
 119     return JUMPNRUN_ERROR;
 120   }
 121
 122   uint8_t err = jumpnrun_pick_level_from_fd(buf, first_visible, selected, progress, &fd);
 123
 124   f_close(&fd);
 125
 126   return err;
 127 }
 128
 129 void jumpnrun_play(void) {
 130   char buf[LEVELFILE_MAX + 1];
 131   size_t first_visible = 0;
 132   size_t selected = 0;
 133   uint8_t progress = jumpnrun_load_progress();
 134   uint8_t choice;
 135
 136   do {
 137     choice = jumpnrun_pick_level(buf, &first_visible, &selected, progress);
 138
 139     switch(choice) {
 140     case CHOICE_LEVEL:
 141       if(JUMPNRUN_WON == jumpnrun_play_level(buf) && selected == progress) {
 142         selected = ++progress;
 143         jumpnrun_save_progress(progress);
 144       }
 145       break;
 146     case CHOICE_CREDITS:
 147       badge_browse_textfile(CREDITSFILE);
 148       break;
 149     }
 150   } while(choice != CHOICE_EXIT);
 151 }