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Added an API to iterate over game controller mappings

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This commit is contained in:
Sam Lantinga 2016-11-29 06:36:57 -08:00
parent 1e8f074c43
commit dd5d85a4e7
5 changed files with 81 additions and 0 deletions
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52
src/joystick/SDL_gamecontroller.c
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@ -96,6 +96,7 @@ typedef struct _ControllerMapping_t
struct _ControllerMapping_t *next;
} ControllerMapping_t;
static SDL_JoystickGUID s_zeroGUID;
static ControllerMapping_t *s_pSupportedControllers = NULL;
static ControllerMapping_t *s_pXInputMapping = NULL;
static ControllerMapping_t *s_pEmscriptenMapping = NULL;
@ -872,6 +873,57 @@ SDL_GameControllerAddMapping(const char *mappingString)
return SDL_PrivateGameControllerAddMapping(mappingString, SDL_CONTROLLER_MAPPING_PRIORITY_API);
}
/**
* Get the number of mappings installed
*/
int
SDL_GameControllerNumMappings()
{
int num_mappings = 0;
ControllerMapping_t *mapping;
for (mapping = s_pSupportedControllers; mapping; mapping = mapping->next) {
if (SDL_memcmp(&mapping->guid, &s_zeroGUID, sizeof(mapping->guid)) == 0) {
continue;
}
++num_mappings;
}
return num_mappings;
}
/**
* Get the mapping at a particular index.
*/
char *
SDL_GameControllerMappingForIndex(int mapping_index)
{
ControllerMapping_t *mapping;
for (mapping = s_pSupportedControllers; mapping; mapping = mapping->next) {
if (SDL_memcmp(&mapping->guid, &s_zeroGUID, sizeof(mapping->guid)) == 0) {
continue;
}
if (mapping_index == 0) {
char *pMappingString;
char pchGUID[33];
size_t needed;
SDL_JoystickGetGUIDString(mapping->guid, pchGUID, sizeof(pchGUID));
/* allocate enough memory for GUID + ',' + name + ',' + mapping + \0 */
needed = SDL_strlen(pchGUID) + 1 + SDL_strlen(mapping->name) + 1 + SDL_strlen(mapping->mapping) + 1;
pMappingString = SDL_malloc(needed);
if (!pMappingString) {
SDL_OutOfMemory();
return NULL;
}
SDL_snprintf(pMappingString, needed, "%s,%s,%s", pchGUID, mapping->name, mapping->mapping);
return pMappingString;
}
--mapping_index;
}
return NULL;
}
/*
* Get the mapping string for this GUID
*/