Service logic moved to kernel (#554)

+ fix BT service file paths

TactilityKernel/source/paths.cpp

@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: Apache-2.0
+
+#include <tactility/paths.h>
+#include <tactility/device.h>
+#include <tactility/drivers/sdcard.h>
+#include <tactility/filesystem/file_system.h>
+
+#include <cstdio>
+#include <cstring>
+
+static error_t get_user_data_root_path(char* out_path, size_t out_path_size) {
+#if defined(CONFIG_TT_USER_DATA_LOCATION_INTERNAL)
+#ifdef ESP_PLATFORM
+    const char* mount_point = "/data";
+#else
+    const char* mount_point = "data";
+#endif
+    if (std::strlen(mount_point) + 1 > out_path_size) {
+        return ERROR_BUFFER_OVERFLOW;
+    }
+    std::strcpy(out_path, mount_point);
+    return ERROR_NONE;
+#elif defined(CONFIG_TT_USER_DATA_LOCATION_SD)
+    struct FileSystem* found = nullptr;
+    file_system_for_each(&found, [](FileSystem* fs, void* context) {
+        auto* owner = file_system_get_owner(fs);
+        if (owner == nullptr || device_get_type(owner) != &SDCARD_TYPE) {
+            return true;
+        }
+        *static_cast<FileSystem**>(context) = fs;
+        return false;
+    });
+    if (found == nullptr) {
+        return ERROR_NOT_FOUND;
+    }
+    return file_system_get_path(found, out_path, out_path_size);
+#else
+#error CONFIG_TT_USER_DATA_* not set or unsupported
+#endif
+}
+
+extern "C" {
+
+error_t paths_get_user_data_path(char* out_path, size_t out_path_size) {
+#ifdef ESP_PLATFORM
+    char root[64];
+    error_t error = get_user_data_root_path(root, sizeof(root));
+    if (error != ERROR_NONE) {
+        return error;
+    }
+    int written = std::snprintf(out_path, out_path_size, "%s/tactility", root);
+    if (written < 0 || (size_t)written >= out_path_size) {
+        return ERROR_BUFFER_OVERFLOW;
+    }
+    return ERROR_NONE;
+#else
+    const char* fixed_path = "data";
+    if (std::strlen(fixed_path) + 1 > out_path_size) {
+        return ERROR_BUFFER_OVERFLOW;
+    }
+    std::strcpy(out_path, fixed_path);
+    return ERROR_NONE;
+#endif
+}
+
+} // extern "C"