Replace dynamic allocations with fixed-size buffers and add module extension filtering

- Use fixed STK_PATH_MAX and STK_MOD_ID_BUFFER throughout for predictable memory
- Filter by platform-specific extensions (.so/.dll/.dylib) with compile-time length
- Add RELOAD event detection and is_module_loaded() helper
- Maintain feature parity across all platforms

src/platform.c

@@ -22,93 +22,104 @@
 #include <unistd.h>
 #endif
 
-#define EVENT_BUFFER_SIZE 4096
+#if defined(__linux__) || defined(_WIN32)
+#define STK_EVENT_BUFFER 4096
+#endif
 
-#if !defined(_WIN32)
-static char **scan_directory(const char *path, size_t *out_count)
+#if defined(_WIN32)
+#define STK_MODULE_EXT ".dll"
+#elif defined(__APPLE__)
+#define STK_MODULE_EXT ".dylib"
+#else
+#define STK_MODULE_EXT ".so"
+#endif
+
+#define STK_MODULE_EXT_LEN (sizeof(STK_MODULE_EXT) - 1)
+
+static uint8_t is_valid_module_file(const char *filename)
 {
-	DIR *dir;
-	struct dirent *entry;
-	struct stat file_stat;
-	char full_path[PATH_BUFFER_SIZE];
-	char **file_list = NULL;
-	size_t count = 0, index = 0;
+	const char *ext;
+	size_t name_len;
 
-	dir = opendir(path);
-	if (!dir) {
-		mkdir(path, 0755);
-		*out_count = 0;
-		return NULL;
-	}
+	if (!filename)
+		return 0;
 
-	while ((entry = readdir(dir)) != NULL) {
-		sprintf(full_path, "%s/%s", path, entry->d_name);
-		if (stat(full_path, &file_stat) == 0 &&
-		    S_ISREG(file_stat.st_mode))
-			count++;
-	}
+	name_len = strlen(filename);
 
-	if (count == 0) {
-		closedir(dir);
-		*out_count = 0;
-		return NULL;
-	}
+	if (name_len <= STK_MODULE_EXT_LEN)
+		return 0;
 
-	rewinddir(dir);
-
-	file_list = (char **)malloc(count * sizeof(char *));
-	if (!file_list) {
-		closedir(dir);
-		*out_count = 0;
-		return NULL;
-	}
-
-	while ((entry = readdir(dir)) != NULL && index < count) {
-		sprintf(full_path, "%s/%s", path, entry->d_name);
-		if (stat(full_path, &file_stat) != 0 ||
-		    !S_ISREG(file_stat.st_mode))
-			continue;
-
-		file_list[index] = (char *)malloc(strlen(entry->d_name) + 1);
-		if (file_list[index]) {
-			strcpy(file_list[index], entry->d_name);
-			index++;
-		}
-	}
-
-	closedir(dir);
-	*out_count = index;
-	return file_list;
+	ext = filename + (name_len - STK_MODULE_EXT_LEN);
+	return strcmp(ext, STK_MODULE_EXT) == 0;
 }
 
+static uint8_t is_module_loaded(const char *filename,
+				char (*loaded_module_ids)[STK_MOD_ID_BUFFER],
+				size_t loaded_count)
+{
+	char module_id[STK_MOD_ID_BUFFER];
+	const char *basename;
+	char *dot;
+	size_t i;
+
+	basename = strrchr(filename, '/');
+#ifdef _WIN32
+	if (!basename)
+		basename = strrchr(filename, '\\');
 #endif
+	if (!basename)
+		basename = filename;
+	else
+		basename++;
+
+	strncpy(module_id, basename, STK_MOD_ID_BUFFER - 1);
+	module_id[STK_MOD_ID_BUFFER - 1] = '\0';
+
+	dot = strrchr(module_id, '.');
+	if (dot)
+		*dot = '\0';
+
+	for (i = 0; i < loaded_count; i++)
+		if (strcmp(loaded_module_ids[i], module_id) == 0)
+			return 1;
+
+	return 0;
+}
 
 #if !defined(__linux__) && !defined(_WIN32)
 typedef struct {
-	char *filename;
+	char filename[STK_PATH_MAX];
 	time_t mtime;
 } file_snapshot_t;
 
 typedef struct {
 	int kq;
 	int dir_fd;
-	char path[PATH_BUFFER_SIZE];
+	char path[STK_PATH_MAX];
 	file_snapshot_t *snapshots;
 	size_t snapshot_count;
+	size_t snapshot_capacity;
 } kqueue_watch_context_t;
 
-static file_snapshot_t *create_snapshot(const char *path, size_t *out_count)
+static file_snapshot_t *create_snapshot(const char *path, size_t *out_count,
+					size_t *out_capacity)
 {
 	DIR *dir;
 	struct dirent *entry;
 	struct stat file_stat;
-	char full_path[PATH_BUFFER_SIZE];
-	file_snapshot_t *snapshots = NULL;
-	size_t count = 0, index = 0;
+	char work_path[STK_PATH_MAX_OS];
+	file_snapshot_t *snapshots;
+	size_t count, capacity, index;
+
+	snapshots = NULL;
+	count = 0;
+	capacity = 0;
+	index = 0;
 
 	dir = opendir(path);
 	if (!dir) {
 		*out_count = 0;
+		*out_capacity = 0;
 		return NULL;
 	}
 
@@ -116,9 +127,12 @@ static file_snapshot_t *create_snapshot(const char *path, size_t *out_count)
 		if (strcmp(entry->d_name, ".") == 0 ||
 		    strcmp(entry->d_name, "..") == 0)
 			continue;
-		snprintf(full_path, sizeof(full_path), "%s/%s", path,
-			 entry->d_name);
-		if (stat(full_path, &file_stat) == 0 &&
+
+		if (!is_valid_module_file(entry->d_name))
+			continue;
+
+		sprintf(work_path, "%s/%s", path, entry->d_name);
+		if (stat(work_path, &file_stat) == 0 &&
 		    S_ISREG(file_stat.st_mode))
 			count++;
 	}
@@ -126,13 +140,16 @@ static file_snapshot_t *create_snapshot(const char *path, size_t *out_count)
 	if (count == 0) {
 		closedir(dir);
 		*out_count = 0;
+		*out_capacity = 0;
 		return NULL;
 	}
 
-	snapshots = malloc(count * sizeof(file_snapshot_t));
+	capacity = count + 8;
+	snapshots = malloc(capacity * sizeof(file_snapshot_t));
 	if (!snapshots) {
 		closedir(dir);
 		*out_count = 0;
+		*out_capacity = 0;
 		return NULL;
 	}
 
@@ -142,47 +159,39 @@ static file_snapshot_t *create_snapshot(const char *path, size_t *out_count)
 		if (strcmp(entry->d_name, ".") == 0 ||
 		    strcmp(entry->d_name, "..") == 0)
 			continue;
-		snprintf(full_path, sizeof(full_path), "%s/%s", path,
-			 entry->d_name);
-		if (stat(full_path, &file_stat) != 0 ||
+
+		if (!is_valid_module_file(entry->d_name))
+			continue;
+
+		sprintf(work_path, "%s/%s", path, entry->d_name);
+		if (stat(work_path, &file_stat) != 0 ||
 		    !S_ISREG(file_stat.st_mode))
 			continue;
 
-		snapshots[index].filename = malloc(strlen(entry->d_name) + 1);
-		if (snapshots[index].filename) {
-			strcpy(snapshots[index].filename, entry->d_name);
-			snapshots[index].mtime = file_stat.st_mtime;
-			index++;
-		}
+		strncpy(snapshots[index].filename, entry->d_name,
+			STK_PATH_MAX - 1);
+		snapshots[index].filename[STK_PATH_MAX - 1] = '\0';
+		snapshots[index].mtime = file_stat.st_mtime;
+		index++;
 	}
 
 	closedir(dir);
 	*out_count = index;
+	*out_capacity = capacity;
 	return snapshots;
 }
 
-static void free_snapshot(file_snapshot_t *snapshots, size_t count)
-{
-	size_t i;
-	if (!snapshots)
-		return;
-	for (i = 0; i < count; i++) {
-		free(snapshots[i].filename);
-	}
-	free(snapshots);
-}
-
 static file_snapshot_t *find_in_snapshot(file_snapshot_t *snapshots,
 					 size_t count, const char *filename)
 {
 	size_t i;
 	for (i = 0; i < count; i++) {
-		if (strcmp(snapshots[i].filename, filename) == 0)
+		if (strcmp(snapshots[i].filename, filename) == 0) {
 			return &snapshots[i];
+		}
 	}
 	return NULL;
 }
-
 #endif
 
 void *platform_load_library(const char *path)
@@ -216,60 +225,50 @@ void *platform_directory_watch_start(const char *path)
 {
 #ifdef __linux__
 	int fd, wd;
-
 	fd = inotify_init1(IN_NONBLOCK);
 	if (fd < 0)
 		return NULL;
-
 	wd = inotify_add_watch(
 	    fd, path, IN_CLOSE_WRITE | IN_DELETE | IN_MOVED_TO | IN_MOVED_FROM);
-
 	if (wd < 0) {
 		close(fd);
 		return NULL;
 	}
-
 	return (void *)(long)fd;
-
 #elif defined(_WIN32)
 	HANDLE handle =
 	    CreateFileA(path, FILE_LIST_DIRECTORY,
 			FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
 			NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
-
-	if (handle == INVALID_HANDLE_VALUE)
-		return NULL;
-
-	return (void *)handle;
-
+	return (handle == INVALID_HANDLE_VALUE) ? NULL : (void *)handle;
 #else
 	struct kevent event;
-	kqueue_watch_context_t *ctx = malloc(sizeof(kqueue_watch_context_t));
+	kqueue_watch_context_t *ctx;
+
+	ctx = malloc(sizeof(kqueue_watch_context_t));
 	if (!ctx)
 		return NULL;
 
 	ctx->kq = kqueue();
 	ctx->dir_fd = open(path, O_RDONLY);
-	strncpy(ctx->path, path, PATH_BUFFER_SIZE - 1);
-	ctx->path[PATH_BUFFER_SIZE - 1] = '\0';
-
-	ctx->snapshots = create_snapshot(path, &ctx->snapshot_count);
+	strncpy(ctx->path, path, STK_PATH_MAX - 1);
+	ctx->path[STK_PATH_MAX - 1] = '\0';
+	ctx->snapshots = create_snapshot(path, &ctx->snapshot_count,
+					 &ctx->snapshot_capacity);
 
 	if (ctx->kq < 0 || ctx->dir_fd < 0) {
 		if (ctx->kq >= 0)
 			close(ctx->kq);
 		if (ctx->dir_fd >= 0)
 			close(ctx->dir_fd);
-		free_snapshot(ctx->snapshots, ctx->snapshot_count);
+		free(ctx->snapshots);
 		free(ctx);
 		return NULL;
 	}
 
 	EV_SET(&event, ctx->dir_fd, EVFILT_VNODE, EV_ADD | EV_ENABLE | EV_CLEAR,
 	       NOTE_WRITE | NOTE_DELETE | NOTE_RENAME, 0, NULL);
-
 	kevent(ctx->kq, &event, 1, NULL, 0, NULL);
-
 	return (void *)ctx;
 #endif
 }
@@ -277,43 +276,42 @@ void *platform_directory_watch_start(const char *path)
 void platform_directory_watch_stop(void *handle)
 {
 #ifdef __linux__
-	if (!handle)
-		return;
-	close((int)(long)handle);
-
+	if (handle)
+		close((int)(long)handle);
 #elif defined(_WIN32)
-	CloseHandle((HANDLE)handle);
-
+	if (handle)
+		CloseHandle((HANDLE)handle);
 #else
-	kqueue_watch_context_t *ctx = (kqueue_watch_context_t *)handle;
+	kqueue_watch_context_t *ctx;
+	ctx = (kqueue_watch_context_t *)handle;
 	if (!ctx)
 		return;
-
 	if (ctx->dir_fd >= 0)
 		close(ctx->dir_fd);
 	if (ctx->kq >= 0)
 		close(ctx->kq);
-	free_snapshot(ctx->snapshots, ctx->snapshot_count);
+	free(ctx->snapshots);
 	free(ctx);
 #endif
 }
 
-stk_module_event_t *platform_directory_watch_check(void *handle,
-						   char ***file_list,
-						   size_t *out_count)
+stk_module_event_t *platform_directory_watch_check(
+    void *handle, char (**file_list)[STK_PATH_MAX], size_t *out_count,
+    char (*loaded_module_ids)[STK_MOD_ID_BUFFER], const size_t loaded_count)
 {
-#if defined(__linux__) || defined(_WIN32)
-	size_t file_count = 0;
-#endif
 	size_t index = 0;
 	stk_module_event_t *events = NULL;
 
 #ifdef __linux__
-	char buffer[EVENT_BUFFER_SIZE];
+	char buffer[STK_EVENT_BUFFER];
 	ssize_t bytes_read;
 	struct inotify_event *event;
 	char *event_ptr;
-	int fd = (int)(long)handle;
+	int fd;
+	size_t file_count;
+
+	fd = (int)(long)handle;
+	file_count = 0;
 
 	bytes_read = read(fd, buffer, sizeof(buffer));
 	if (bytes_read <= 0) {
@@ -324,7 +322,7 @@ stk_module_event_t *platform_directory_watch_check(void *handle,
 	event_ptr = buffer;
 	while (event_ptr < buffer + bytes_read) {
 		event = (struct inotify_event *)event_ptr;
-		if (event->len > 0)
+		if (event->len > 0 && is_valid_module_file(event->name))
 			file_count++;
 		event_ptr += sizeof(struct inotify_event) + event->len;
 	}
@@ -335,43 +333,46 @@ stk_module_event_t *platform_directory_watch_check(void *handle,
 	}
 
 	events = malloc(file_count * sizeof(stk_module_event_t));
-	*file_list = malloc(file_count * sizeof(char *));
-	if (!events || !*file_list) {
-		free(events);
-		free(*file_list);
-		*out_count = 0;
-		return NULL;
-	}
+	*file_list = malloc(file_count * sizeof(**file_list));
 
 	index = 0;
 	event_ptr = buffer;
 	while (event_ptr < buffer + bytes_read) {
 		event = (struct inotify_event *)event_ptr;
-		if (event->len > 0) {
+		if (event->len > 0 && is_valid_module_file(event->name)) {
 			events[index] =
 			    (event->mask & (IN_CLOSE_WRITE | IN_MOVED_TO))
-				? STK_MOD_LOAD
+				? (is_module_loaded(event->name,
+						    loaded_module_ids,
+						    loaded_count)
+				       ? STK_MOD_RELOAD
+				       : STK_MOD_LOAD)
 				: STK_MOD_UNLOAD;
-			(*file_list)[index] = malloc(strlen(event->name) + 1);
-			if ((*file_list)[index]) {
-				strcpy((*file_list)[index], event->name);
-				index++;
-			}
+			strncpy((*file_list)[index], event->name,
+				STK_PATH_MAX - 1);
+			(*file_list)[index][STK_PATH_MAX - 1] = '\0';
+			index++;
 		}
 		event_ptr += sizeof(struct inotify_event) + event->len;
 	}
 #elif defined(_WIN32)
-	HANDLE h = (HANDLE)handle;
-	BYTE buffer[EVENT_BUFFER_SIZE];
+	HANDLE h;
+	BYTE buffer[STK_EVENT_BUFFER];
 	DWORD bytes_returned;
 	FILE_NOTIFY_INFORMATION *info;
 	BYTE *event_ptr;
-	int char_count;
+	size_t file_count;
+	char temp_filename[STK_PATH_MAX];
+	int len;
+	BOOL result;
 
-	BOOL result = ReadDirectoryChangesW(h, buffer, sizeof(buffer), FALSE,
-					    FILE_NOTIFY_CHANGE_FILE_NAME |
-						FILE_NOTIFY_CHANGE_LAST_WRITE,
-					    &bytes_returned, NULL, NULL);
+	h = (HANDLE)handle;
+	file_count = 0;
+
+	result = ReadDirectoryChangesW(h, buffer, sizeof(buffer), FALSE,
+				       FILE_NOTIFY_CHANGE_FILE_NAME |
+					   FILE_NOTIFY_CHANGE_LAST_WRITE,
+				       &bytes_returned, NULL, NULL);
 	if (!result || bytes_returned == 0) {
 		*out_count = 0;
 		return NULL;
@@ -380,7 +381,15 @@ stk_module_event_t *platform_directory_watch_check(void *handle,
 	event_ptr = buffer;
 	while (1) {
 		info = (FILE_NOTIFY_INFORMATION *)event_ptr;
-		file_count++;
+		len = WideCharToMultiByte(CP_UTF8, 0, info->FileName,
+					  info->FileNameLength / sizeof(WCHAR),
+					  temp_filename, STK_PATH_MAX - 1, NULL,
+					  NULL);
+		if (len > 0) {
+			temp_filename[len] = '\0';
+			if (is_valid_module_file(temp_filename))
+				file_count++;
+		}
 		if (info->NextEntryOffset == 0)
 			break;
 		event_ptr += info->NextEntryOffset;
@@ -392,67 +401,59 @@ stk_module_event_t *platform_directory_watch_check(void *handle,
 	}
 
 	events = malloc(file_count * sizeof(stk_module_event_t));
-	*file_list = malloc(file_count * sizeof(char *));
-	if (!events || !*file_list) {
-		free(events);
-		free(*file_list);
-		*out_count = 0;
-		return NULL;
-	}
+	*file_list = malloc(file_count * sizeof(**file_list));
 
 	index = 0;
 	event_ptr = buffer;
 	while (1) {
 		info = (FILE_NOTIFY_INFORMATION *)event_ptr;
-		events[index] = (info->Action == FILE_ACTION_ADDED ||
-				 info->Action == FILE_ACTION_MODIFIED ||
-				 info->Action == FILE_ACTION_RENAMED_NEW_NAME)
-				    ? STK_MOD_LOAD
-				    : STK_MOD_UNLOAD;
-		char_count = WideCharToMultiByte(
-		    CP_UTF8, 0, info->FileName,
-		    info->FileNameLength / sizeof(WCHAR), NULL, 0, NULL, NULL);
-
-		if (char_count > 0) {
-			(*file_list)[index] = malloc(char_count + 1);
-			if ((*file_list)[index]) {
-				WideCharToMultiByte(CP_UTF8, 0, info->FileName,
-						    info->FileNameLength /
-							sizeof(WCHAR),
-						    (*file_list)[index],
-						    char_count, NULL, NULL);
-				(*file_list)[index][char_count] = '\0';
+		len = WideCharToMultiByte(CP_UTF8, 0, info->FileName,
+					  info->FileNameLength / sizeof(WCHAR),
+					  (*file_list)[index], STK_PATH_MAX - 1,
+					  NULL, NULL);
+		if (len > 0) {
+			(*file_list)[index][len] = '\0';
+			if (is_valid_module_file((*file_list)[index])) {
+				events[index] =
+				    (info->Action != FILE_ACTION_REMOVED &&
+				     info->Action !=
+					 FILE_ACTION_RENAMED_OLD_NAME)
+					? (is_module_loaded((*file_list)[index],
+							    loaded_module_ids,
+							    loaded_count)
+					       ? STK_MOD_RELOAD
+					       : STK_MOD_LOAD)
+					: STK_MOD_UNLOAD;
 				index++;
 			}
 		}
-
 		if (info->NextEntryOffset == 0)
 			break;
 		event_ptr += info->NextEntryOffset;
 	}
 #else
-	kqueue_watch_context_t *ctx = (kqueue_watch_context_t *)handle;
+	kqueue_watch_context_t *ctx;
 	struct kevent event;
-	struct timespec timeout = {0, 0};
-	int nevents;
-	file_snapshot_t *new_snapshots, *old_snap, *new_snap;
-	size_t new_count, i;
-	size_t change_count = 0;
+	struct timespec timeout;
+	file_snapshot_t *new_snapshots, *old_snap;
+	size_t new_count, new_capacity, i, change_count;
 
-	nevents = kevent(ctx->kq, NULL, 0, &event, 1, &timeout);
-	if (nevents <= 0) {
+	ctx = (kqueue_watch_context_t *)handle;
+	timeout.tv_sec = 0;
+	timeout.tv_nsec = 0;
+	change_count = 0;
+
+	if (kevent(ctx->kq, NULL, 0, &event, 1, &timeout) <= 0) {
 		*out_count = 0;
 		return NULL;
 	}
 
-	new_snapshots = create_snapshot(ctx->path, &new_count);
+	new_snapshots = create_snapshot(ctx->path, &new_count, &new_capacity);
 
-	for (i = 0; i < ctx->snapshot_count; i++) {
-		new_snap = find_in_snapshot(new_snapshots, new_count,
-					    ctx->snapshots[i].filename);
-		if (!new_snap)
+	for (i = 0; i < ctx->snapshot_count; i++)
+		if (!find_in_snapshot(new_snapshots, new_count,
+				      ctx->snapshots[i].filename))
 			change_count++;
-	}
 
 	for (i = 0; i < new_count; i++) {
 		old_snap = find_in_snapshot(ctx->snapshots, ctx->snapshot_count,
@@ -462,34 +463,24 @@ stk_module_event_t *platform_directory_watch_check(void *handle,
 	}
 
 	if (change_count == 0) {
-		free_snapshot(new_snapshots, new_count);
+		free(new_snapshots);
 		*out_count = 0;
 		return NULL;
 	}
 
 	events = malloc(change_count * sizeof(stk_module_event_t));
-	*file_list = malloc(change_count * sizeof(char *));
-	if (!events || !*file_list) {
-		free(events);
-		free(*file_list);
-		free_snapshot(new_snapshots, new_count);
-		*out_count = 0;
-		return NULL;
-	}
+	*file_list = malloc(change_count * sizeof(**file_list));
 
 	index = 0;
+
 	for (i = 0; i < ctx->snapshot_count && index < change_count; i++) {
-		new_snap = find_in_snapshot(new_snapshots, new_count,
-					    ctx->snapshots[i].filename);
-		if (!new_snap) {
+		if (!find_in_snapshot(new_snapshots, new_count,
+				      ctx->snapshots[i].filename)) {
 			events[index] = STK_MOD_UNLOAD;
-			(*file_list)[index] =
-			    malloc(strlen(ctx->snapshots[i].filename) + 1);
-			if ((*file_list)[index]) {
-				strcpy((*file_list)[index],
-				       ctx->snapshots[i].filename);
-				index++;
-			}
+			strncpy((*file_list)[index], ctx->snapshots[i].filename,
+				STK_PATH_MAX - 1);
+			(*file_list)[index][STK_PATH_MAX - 1] = '\0';
+			index++;
 		}
 	}
 
@@ -497,49 +488,63 @@ stk_module_event_t *platform_directory_watch_check(void *handle,
 		old_snap = find_in_snapshot(ctx->snapshots, ctx->snapshot_count,
 					    new_snapshots[i].filename);
 		if (!old_snap || old_snap->mtime != new_snapshots[i].mtime) {
-			events[index] = STK_MOD_LOAD;
-			(*file_list)[index] =
-			    malloc(strlen(new_snapshots[i].filename) + 1);
-			if ((*file_list)[index]) {
-				strcpy((*file_list)[index],
-				       new_snapshots[i].filename);
-				index++;
-			}
+			events[index] =
+			    is_module_loaded(new_snapshots[i].filename,
+					     loaded_module_ids, loaded_count)
+				? STK_MOD_RELOAD
+				: STK_MOD_LOAD;
+			strncpy((*file_list)[index], new_snapshots[i].filename,
+				STK_PATH_MAX - 1);
+			(*file_list)[index][STK_PATH_MAX - 1] = '\0';
+			index++;
 		}
 	}
 
-	free_snapshot(ctx->snapshots, ctx->snapshot_count);
+	free(ctx->snapshots);
 	ctx->snapshots = new_snapshots;
 	ctx->snapshot_count = new_count;
+	ctx->snapshot_capacity = new_capacity;
 #endif
 	*out_count = index;
 	return events;
 }
 
-char **platform_directory_init_scan(const char *path, size_t *out_count)
+char (*platform_directory_init_scan(const char *mod_dir,
+				    size_t *out_count))[STK_PATH_MAX]
 {
+	char(*file_list)[STK_PATH_MAX] = NULL;
+	char work_path[STK_PATH_MAX_OS];
+	size_t count = 0, index = 0;
+
 #if defined(_WIN32)
 	WIN32_FIND_DATAW find_data;
 	HANDLE find_handle;
-	WCHAR search_path[PATH_BUFFER_SIZE];
-	char **file_list = NULL;
-	size_t count = 0, index = 0;
-	int utf8_len;
-
-	swprintf(search_path, PATH_BUFFER_SIZE, L"%S\\*", path);
+	WCHAR search_path[STK_PATH_MAX_OS];
+	char temp_filename[STK_PATH_MAX];
+	int len;
 
+	swprintf(search_path, STK_PATH_MAX_OS, L"%S\\*", mod_dir);
 	find_handle = FindFirstFileW(search_path, &find_data);
+
 	if (find_handle == INVALID_HANDLE_VALUE) {
-		CreateDirectoryA(path, NULL);
+		CreateDirectoryA(mod_dir, NULL);
 		*out_count = 0;
 		return NULL;
 	}
 
 	do {
-		if (!(find_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
-			count++;
-	} while (FindNextFileW(find_handle, &find_data));
+		if (find_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
+			continue;
 
+		len = WideCharToMultiByte(CP_UTF8, 0, find_data.cFileName, -1,
+					  temp_filename, STK_PATH_MAX - 1, NULL,
+					  NULL);
+		if (len > 0) {
+			temp_filename[len] = '\0';
+			if (is_valid_module_file(temp_filename))
+				count++;
+		}
+	} while (FindNextFileW(find_handle, &find_data));
 	FindClose(find_handle);
 
 	if (count == 0) {
@@ -548,41 +553,73 @@ char **platform_directory_init_scan(const char *path, size_t *out_count)
 	}
 
 	find_handle = FindFirstFileW(search_path, &find_data);
-	if (find_handle == INVALID_HANDLE_VALUE) {
-		*out_count = 0;
-		return NULL;
-	}
-
-	file_list = (char **)malloc(count * sizeof(char *));
-	if (!file_list) {
-		FindClose(find_handle);
-		*out_count = 0;
-		return NULL;
-	}
+	file_list = malloc(count * sizeof(*file_list));
 
 	do {
-		if (!(find_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) &&
-		    index < count) {
-			utf8_len =
-			    WideCharToMultiByte(CP_UTF8, 0, find_data.cFileName,
-						-1, NULL, 0, NULL, NULL);
-			if (utf8_len > 0) {
-				file_list[index] = (char *)malloc(utf8_len);
-				if (file_list[index]) {
-					WideCharToMultiByte(
-					    CP_UTF8, 0, find_data.cFileName, -1,
-					    file_list[index], utf8_len, NULL,
-					    NULL);
-					index++;
-				}
-			}
+		if (find_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
+			continue;
+
+		len = WideCharToMultiByte(CP_UTF8, 0, find_data.cFileName, -1,
+					  file_list[index], STK_PATH_MAX - 1,
+					  NULL, NULL);
+		if (len > 0 && index < count) {
+			file_list[index][len] = '\0';
+			if (is_valid_module_file(file_list[index]))
+				index++;
 		}
 	} while (FindNextFileW(find_handle, &find_data) && index < count);
-
 	FindClose(find_handle);
+#else
+	DIR *dir;
+	struct dirent *entry;
+	struct stat file_stat;
+
+	dir = opendir(mod_dir);
+	if (!dir) {
+		mkdir(mod_dir, 0755);
+		*out_count = 0;
+		return NULL;
+	}
+
+	while ((entry = readdir(dir)) != NULL) {
+		if (!is_valid_module_file(entry->d_name))
+			continue;
+
+		sprintf(work_path, "%s/%s", mod_dir, entry->d_name);
+		if (stat(work_path, &file_stat) == 0 &&
+		    S_ISREG(file_stat.st_mode))
+			count++;
+	}
+
+	if (count == 0) {
+		closedir(dir);
+		*out_count = 0;
+		return NULL;
+	}
+
+	rewinddir(dir);
+	file_list = malloc(count * sizeof(*file_list));
+	if (!file_list) {
+		closedir(dir);
+		*out_count = 0;
+		return NULL;
+	}
+
+	while ((entry = readdir(dir)) != NULL && index < count) {
+		if (!is_valid_module_file(entry->d_name))
+			continue;
+
+		sprintf(work_path, "%s/%s", mod_dir, entry->d_name);
+		if (stat(work_path, &file_stat) != 0 ||
+		    !S_ISREG(file_stat.st_mode))
+			continue;
+
+		strncpy(file_list[index], entry->d_name, STK_PATH_MAX - 1);
+		file_list[index][STK_PATH_MAX - 1] = '\0';
+		index++;
+	}
+	closedir(dir);
+#endif
 	*out_count = index;
 	return file_list;
-#else
-	return scan_directory(path, out_count);
-#endif
 }