From d49393b339c47733c2eda207b8ba03d61db0a5a3 Mon Sep 17 00:00:00 2001
From: Mattias Andrée <maandree@kth.se>
Date: Sat, 23 Jul 2022 14:39:44 +0200
Subject: First commit
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Mattias Andrée <maandree@kth.se>
---
 libgamepad_open_superdevice.c | 149 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 149 insertions(+)
 create mode 100644 libgamepad_open_superdevice.c

(limited to 'libgamepad_open_superdevice.c')

diff --git a/libgamepad_open_superdevice.c b/libgamepad_open_superdevice.c
new file mode 100644
index 0000000..b6b975f
--- /dev/null
+++ b/libgamepad_open_superdevice.c
@@ -0,0 +1,149 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+int
+libgamepad_open_superdevice(struct libgamepad_superdevice *devicep, const char *syspath)
+{
+	struct libgamepad_subdevice *subdev;
+	int dirfd = -1, dirfd2, dirfd3;
+	DIR *dir = NULL, *dir2 = NULL;
+	struct dirent *f, *f2;
+	enum libgamepad_type type;
+	size_t first = 0, len;
+	void *new;
+	int saved_errno;
+
+	devicep->ndevices = 0;
+	devicep->devices = NULL;
+	devicep->nleds = 0;
+	devicep->leds = NULL;
+	devicep->npower_supplies = 0;
+	devicep->power_supplies = NULL;
+
+	devicep->syspath = strdup(syspath);
+	if (!devicep->syspath)
+		return -1;
+
+	dirfd = open(syspath, O_DIRECTORY);
+	if (dirfd < 0)
+		goto fail;
+
+	dirfd2 = openat(dirfd, "input", O_DIRECTORY);
+	if (dirfd2 < 0)
+		goto fail;
+	dir = fdopendir(dirfd2);
+	if (!dir)
+		goto fail;
+	while (errno = 0, (f = readdir(dir))) {
+		if (!strncmp(f->d_name, "input", 5) && isdigit(f->d_name[5])) {
+			dirfd3 = openat(dirfd2, f->d_name, O_DIRECTORY);
+			if (dirfd3 < 0)
+				goto fail;
+			dir2 = fdopendir(dirfd3);
+			if (!dir2)
+				goto fail;
+			type = 0;
+			while (errno = 0, (f2 = readdir(dir2))) {
+				if (!strncmp(f2->d_name, "event", 5) && isdigit(f2->d_name[5])) {
+					new = realloc(devicep->devices, (devicep->ndevices + 1) * sizeof(*devicep->devices));
+					if (!new)
+						goto fail;
+					devicep->devices = new;
+					len = sizeof("/dev/input/") + strlen(f2->d_name);
+					subdev = malloc(offsetof(struct libgamepad_subdevice, path) + len);
+					if (!subdev)
+						goto fail;
+					stpcpy(stpcpy(subdev->path, "/dev/input/"), f2->d_name);
+					devicep->devices[devicep->ndevices++] = subdev;
+				} else if (!strncmp(f2->d_name, "js", 2) && isdigit(f2->d_name[2])) {
+					type |= LIBGAMEPAD_GAMEPAD;
+				} else if (!strncmp(f2->d_name, "mouse", 5) && isdigit(f2->d_name[5])) {
+					type |= LIBGAMEPAD_MOUSE;
+				}
+			}
+			while (first < devicep->ndevices)
+				devicep->devices[first++]->type = type;
+			closedir(dir2);
+			dir2 = NULL;
+		}
+	}
+	if (errno)
+		goto fail;
+	closedir(dir);
+	dir = NULL;
+
+	dirfd2 = openat(dirfd, "leds", O_DIRECTORY);
+	if (dirfd2 >= 0) {
+		dir = fdopendir(dirfd2);
+		if (!dir)
+			goto fail;
+		len = strlen(syspath) + sizeof("/leds/");
+		while (errno = 0, (f = readdir(dir))) {
+			if (f->d_name[0] != '.') {
+				new = realloc(devicep->leds, (devicep->nleds + 1) * sizeof(*devicep->leds));
+				if (!new)
+					goto fail;
+				devicep->leds = new;
+				devicep->leds[devicep->nleds] = malloc(len + strlen(f->d_name));
+				if (!devicep->leds[devicep->nleds])
+					goto fail;
+				stpcpy(stpcpy(stpcpy(devicep->leds[devicep->nleds], syspath), "/leds/"), f->d_name);
+				devicep->nleds += 1;
+			}
+		}
+		if (errno)
+			goto fail;
+		closedir(dir);
+		dir = NULL;
+	}
+
+	dirfd2 = openat(dirfd, "power_supply", O_DIRECTORY);
+	if (dirfd2 >= 0) {
+		dir = fdopendir(dirfd2);
+		if (!dir)
+			goto fail;
+		len = strlen(syspath) + sizeof("/power_supply/");
+		while (errno = 0, (f = readdir(dir))) {
+			if (f->d_name[0] != '.') {
+				new = realloc(devicep->power_supplies,
+				              (devicep->npower_supplies + 1) * sizeof(*devicep->power_supplies));
+				if (!new)
+					goto fail;
+				devicep->power_supplies = new;
+				devicep->power_supplies[devicep->npower_supplies] = malloc(len + strlen(f->d_name));
+				if (!devicep->power_supplies[devicep->npower_supplies])
+					goto fail;
+				stpcpy(stpcpy(stpcpy(devicep->power_supplies[devicep->npower_supplies], syspath),
+				              "/power_supply/"), f->d_name);
+				devicep->npower_supplies += 1;
+			}
+		}
+		if (errno)
+			goto fail;
+		closedir(dir);
+		dir = NULL;
+	}
+
+	close(dirfd);
+	return 0;
+
+fail:
+	saved_errno = errno;
+	if (dir2)
+		closedir(dir2);
+	if (dir)
+		closedir(dir);
+	if (dirfd >= 0)
+		close(dirfd);
+	libgamepad_close_superdevice(devicep);
+	devicep->syspath = NULL;
+	devicep->ndevices = 0;
+	devicep->devices = NULL;
+	devicep->nleds = 0;
+	devicep->leds = NULL;
+	devicep->npower_supplies = 0;
+	devicep->power_supplies = NULL;
+	errno = saved_errno;
+	return -1;
+}
-- 
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