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Look up mappings by GUID in two passes: first with CRC, second without

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This commit is contained in:
Sam Lantinga 2022-08-23 07:24:21 -07:00
parent 4df64027fc
commit b6a3d76225
1 changed files with 11 additions and 6 deletions
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17
src/joystick/SDL_gamecontroller.c
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@ -663,21 +663,26 @@ static ControllerMapping_t *SDL_CreateMappingForWGIController(SDL_JoystickGUID g
*/
static ControllerMapping_t *SDL_PrivateGetControllerMappingForGUID(SDL_JoystickGUID guid, SDL_bool exact_match)
{
ControllerMapping_t *mapping = s_pSupportedControllers;
ControllerMapping_t *mapping;
SDL_JoystickGUID zero_crc_guid;
/* First check for exact match */
for (mapping = s_pSupportedControllers; mapping; mapping = mapping->next) {
if (SDL_memcmp(&guid, &mapping->guid, sizeof(guid)) == 0) {
return mapping;
}
}
/* Now check for match with no CRC */
SDL_memcpy(&zero_crc_guid, &guid, sizeof(guid));
zero_crc_guid.data[3] = 0;
zero_crc_guid.data[4] = 0;
zero_crc_guid.data[5] = 0;
zero_crc_guid.data[6] = 0;
while (mapping) {
if (SDL_memcmp(&guid, &mapping->guid, sizeof(guid)) == 0 ||
SDL_memcmp(&zero_crc_guid, &mapping->guid, sizeof(guid)) == 0) {
for (mapping = s_pSupportedControllers; mapping; mapping = mapping->next) {
if (SDL_memcmp(&zero_crc_guid, &mapping->guid, sizeof(guid)) == 0) {
return mapping;
}
mapping = mapping->next;
}
if (!exact_match) {