blog:x68_launcher_2

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blog:x68_launcher_2 [2020/08/23 17:05] – [ini.c / ini.h] johnblog:x68_launcher_2 [2020/08/23 19:20] (current) – [Control Flow (a simple main.c)] john
Line 347: Line 347:
 **Output** **Output**
  
-   * gamedata_t * +   * gamedata_t *gamedata
  
 **Description** **Description**
 +
 +The function takes the head item of the //gamedata// linked-list and loops over all nodes until it finds an instance of a gamedata struct with the game ID //gameid//.
 +
 +We use this function to find a gamedata object when we only know a game ID. Once we have a games gamedata object, we can then use it to look up the additional metadata, since the gamedata object tells us whether it has that additional data file, and where it is located on the filesystem.
  
 **Example** **Example**
 +
 +<code "C">
 +int gameid;
 +gamedata_t *gamedata_head = NULL;
 +
 +gameid = 23;
 +
 +// Assuming the gamedata list is already populated...
 +// Keep a record of the head of the list
 +gamedata_head = gamedata;
 +
 +// Return the node which matches the given gameid
 +gamedata = getGameid(gameid);
 +
 +if (gamedata != NULL){
 +   printf("Game ID %d is %s\n", gameid, gamedata->name);
 +}
 +</code>
  
 ---- ----
Line 366: Line 388:
  
 **Description** **Description**
 +
 +This function loops over all items of the gamedata list, from the current position, until it reaches the end (defined as being the node where the //next// pointer is NULL). We use this to determine where to add a new item to the list.
  
 **Example** **Example**
 +
 +This is __only__ currently called within the //findDirs()// function and is used to immediately prior to adding a new item to the end of the list. This ensures the list is always extended in one direction and we never overwrite the current list node:
 +
 +<code "C">
 +gamedata = getLastGamedata(gamedata);
 +gamedata->next = (gamedata_t *) malloc(sizeof(gamedata_t));
 +gamedata->next->game_id = 1234;
 +gamedata->next->drive = drvNumToLetter(buffer.driveno);
 +strcpy(gamedata->next->path, search_dirname);
 +strcpy(gamedata->next->name, buffer.name);
 +gamedata->next->has_dat = dirHasData(search_dirname);
 +gamedata->next->next = NULL;
 +</code>
  
 ---- ----
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 **Description** **Description**
 +
 +Works much the same as the getLastGamedata() function in that it traverses the image list from the current position until it finds the end (determined by the //next// value being NULL).
  
 **Example** **Example**
 +
 +This function is only called within getImageList() within data.c, and is used to build the list of image/artwork/screenshot files as set within a metadata file:
 +
 +<code "C">
 +imagefile = getLastImage(imagefile);
 +imagefile->next = (imagefile_t *) malloc(sizeof(imagefile_t));
 +strcpy(imagefile->next->filename, p);
 +imagefile->next->next = NULL;
 +</code>
  
 ---- ----
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 **Description** **Description**
 +
 +Behaves the same as //getLastGanedata()// and //getLastImage()// but for the game search directories as defined in the application config file. However, the list of game search directories is only parsed once, at startup, so this function remains unused.
  
 **Example** **Example**
 +
 +__Not currently used.__
  
 ---- ----
  
-=== int removeGamedata() ===+=== removeGamedata() ===
  
 **Input**  **Input** 
Line 513: Line 565:
 ---- ----
  
-=== int getLaunchdata() ===+=== getLaunchdata() ===
  
-gamedata_t *gamedata, launchdat_t *launchdat+**Input** 
 + 
 +   * gamedata_t *gamedata 
 +   * launchdat_t *launchdat 
 + 
 +**Output** 
 + 
 +   * int 
 + 
 +**Description** 
 + 
 +**Example**
  
 ---- ----
  
-=== static int configHandler() ===+=== configHandler() ===
  
-void* user, const char* section, const char* name, const char* value+**Input** 
 + 
 +   * void* user 
 +   * const char* section 
 +   * const char* name 
 +   * const char* value 
 + 
 +**Output** 
 + 
 +   * static int 
 + 
 +**Description** 
 + 
 +**Example**
  
 ---- ----
  
-=== int getIni() ===+=== getIni() ===
  
-config_t *config, int verbose+**Input** 
 + 
 +   * config_t *config 
 +   * int verbose 
 + 
 +**Output** 
 + 
 +   * int 
 + 
 +**Description** 
 + 
 +**Example**
  
 ---- ----
  
-=== int getImageList() ===+=== getImageList() ===
  
-launchdat_t *launchdat, imagefile_t *imagefile+**Input** 
 + 
 +   * launchdat_t *launchdat 
 +   * imagefile_t *imagefile 
 + 
 +**Output** 
 + 
 +   * int 
 + 
 +**Description** 
 + 
 +**Example**
  
 ---- ----
  
-=== int getDirList() ===+=== getDirList() ===
  
-config_t *config, gamedir_t *gamedir, int verbose+**Input** 
 + 
 +   * config_t *config 
 +   * gamedir_t *gamedir 
 +   * int verbose 
 + 
 +**Output** 
 + 
 +   * int 
 + 
 +**Description** 
 + 
 +**Example**
  
 ---- ----
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 gamedata_t *gamedata_head = NULL;   // Constant pointer to the start of the gamedata list gamedata_t *gamedata_head = NULL;   // Constant pointer to the start of the gamedata list
  
-// Create a new empty gamedata entry+// Create a new empty gamedata entry which will hold all of 
 +// the games that we find
 gamedata = (gamedata_t *) malloc(sizeof(gamedata_t)); gamedata = (gamedata_t *) malloc(sizeof(gamedata_t));
 gamedata->next = NULL; gamedata->next = NULL;
   
-// Parse the gamedirs that are set+// Create a new gamedir list to hold the game search directories  
 +// which are extracted from the application config file
 gamedir = (gamedir_t *) malloc(sizeof(gamedir_t)); gamedir = (gamedir_t *) malloc(sizeof(gamedir_t));
 gamedir->next = NULL; gamedir->next = NULL;
  
-// Create an instance of a config data+// Create an instance of a config data, which will be filled 
 +// by parsing the application config ini file
 config = (config_t *) malloc(sizeof(config_t)); config = (config_t *) malloc(sizeof(config_t));
 config->dir = NULL; config->dir = NULL;
  • blog/x68_launcher_2.1598198731.txt.gz
  • Last modified: 2020/08/23 17:05
  • by john