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Sort joystick entries in /dev/input 

This fixes https://github.com/libsdl-org/SDL/issues/4430
This commit is contained in:
Sam Lantinga 2021-07-26 12:09:33 -07:00
parent 8d527def81
commit ba8bc143c1
1 changed files with 21 additions and 13 deletions
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34
src/joystick/linux/SDL_sysjoystick.c
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@ -589,6 +589,18 @@ LINUX_InotifyJoystickDetect(void)
* have to do this the first time, to detect devices that already existed
* before we started; in the non-inotify code path we do this repeatedly
* (polling). */
static int
filter_entries(const struct dirent *entry)
{
return (SDL_strlen(entry->d_name) > 5 && SDL_strncmp(entry->d_name, "event", 5) == 0);
}
static int
sort_entries(const struct dirent **a, const struct dirent **b)
{
int numA = SDL_atoi((*a)->d_name+5);
int numB = SDL_atoi((*b)->d_name+5);
return (numA - numB);
}
static void
LINUX_FallbackJoystickDetect(void)
{
@ -600,22 +612,18 @@ LINUX_FallbackJoystickDetect(void)
/* Opening input devices can generate synchronous device I/O, so avoid it if we can */
if (stat("/dev/input", &sb) == 0 && sb.st_mtime != last_input_dir_mtime) {
DIR *folder;
struct dirent *dent;
int i, count;
struct dirent **entries;
char path[PATH_MAX];
folder = opendir("/dev/input");
if (folder) {
while ((dent = readdir(folder))) {
int len = SDL_strlen(dent->d_name);
if (len > 5 && SDL_strncmp(dent->d_name, "event", 5) == 0) {
char path[PATH_MAX];
SDL_snprintf(path, SDL_arraysize(path), "/dev/input/%s", dent->d_name);
MaybeAddDevice(path);
}
}
count = scandir("/dev/input", &entries, filter_entries, sort_entries);
for (i = 0; i < count; ++i) {
SDL_snprintf(path, SDL_arraysize(path), "/dev/input/%s", entries[i]->d_name);
MaybeAddDevice(path);
closedir(folder);
free(entries[i]); /* This should NOT be SDL_free() */
}
free(entries); /* This should NOT be SDL_free() */
last_input_dir_mtime = sb.st_mtime;
}