1 files changed, 77 insertions, 0 deletions
diff --git a/libgamepad_list_superdevices.c b/libgamepad_list_superdevices.c
new file mode 100644
index 0000000..f8c7c4d
--- /dev/null
+++ b/libgamepad_list_superdevices.c
@@ -0,0 +1,77 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+int
+libgamepad_list_superdevices(char ***devicesp, size_t *ndevicesp)
+{
+	char path[PATH_MAX], target[PATH_MAX]; /* TODO do not use PATH_MAX */
+	int dirfd;
+	DIR *dir;
+	struct dirent *f;
+	ssize_t r;
+	char **paths = NULL;
+	size_t n = 0, i;
+	void *new;
+	int saved_errno = errno;
+
+	*devicesp = NULL;
+	*ndevicesp = 0;
+
+	dirfd = open("/sys/class/input/", O_DIRECTORY);
+	if (dirfd < 0)
+		return -1;
+
+	dir = fdopendir(dirfd);
+	if (!dir) {
+		close(dirfd);
+		return -1;
+	}
+
+	while (errno = 0, (f = readdir(dir))) {
+		if (!strncmp(f->d_name, "event", 5) && isdigit(f->d_name[5])) {
+			stpcpy(stpcpy(stpcpy(path, "/sys/class/input/"), f->d_name), "/device/device");
+			dirfd = open(path, O_PATH);
+			if (dirfd < 0)
+				continue;
+			sprintf(path, "/dev/fd/%i", dirfd);
+			r = readlink(path, target, sizeof(target) - 1);
+			close(dirfd);
+			if (r < 0)
+				continue;
+			target[r] = '\0';
+			if (paths)
+				for (i = 0; i < n; i++)
+					if (!strcmp(paths[i], target))
+						goto next;
+			stpcpy(stpcpy(path, target), "/input");
+			if (access(path, F_OK))
+				continue;
+			new = realloc(paths, (n + 1) * sizeof(*paths));
+			if (!new)
+				goto fail;
+			paths = new;
+			paths[n] = strdup(target);
+			if (!paths[n])
+				goto fail;
+			n += 1;
+		}
+	next:;
+	}
+
+	if (errno)
+		goto fail;
+	closedir(dir);
+
+	errno = saved_errno;
+	*devicesp = paths;
+	*ndevicesp = n;
+	return 0;
+
+fail:
+	for (i = 0; i < n; i++)
+		free(paths[i]);
+	free(paths);
+	closedir(dir);
+	return -1;
+}