libptouch を複数ソースに分割し src/lib に配置

- core / usb / print / status / png と libptouch_internal.h に分割
- 旧単一ファイル src/libptouch.c を削除
- CMake のソース一覧と include パスを更新
- README・libptouch.h の参照パスを追随

Made-with: Cursor

CMakeLists.txt

@@ -21,8 +21,16 @@ configure_file(
 	@ONLY
 )
 
-add_library(ptouch STATIC src/libptouch.c)
-add_library(ptouch_shared SHARED src/libptouch.c)
+set(LIBPTOUCH_SOURCES
+	src/lib/libptouch_core.c
+	src/lib/libptouch_usb.c
+	src/lib/libptouch_print.c
+	src/lib/libptouch_status.c
+	src/lib/libptouch_png.c
+)
+
+add_library(ptouch STATIC ${LIBPTOUCH_SOURCES})
+add_library(ptouch_shared SHARED ${LIBPTOUCH_SOURCES})
 set_target_properties(ptouch_shared PROPERTIES OUTPUT_NAME ptouch
 	SOVERSION ${PROJECT_VERSION_MAJOR})
 target_include_directories(ptouch PUBLIC
@@ -30,11 +38,17 @@ target_include_directories(ptouch PUBLIC
 	"$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/include>"
 	"$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>"
 )
+target_include_directories(ptouch PRIVATE
+	"${CMAKE_CURRENT_SOURCE_DIR}/src/lib"
+)
 target_include_directories(ptouch_shared PUBLIC
 	"$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>"
 	"$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/include>"
 	"$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>"
 )
+target_include_directories(ptouch_shared PRIVATE
+	"${CMAKE_CURRENT_SOURCE_DIR}/src/lib"
+)
 target_link_libraries(ptouch PRIVATE PkgConfig::LIBUSB PNG::PNG)
 target_link_libraries(ptouch_shared PRIVATE PkgConfig::LIBUSB PNG::PNG)
 if(NOT MSVC)