Added support for a C API.

CMakeLists.txt

@@ -37,6 +37,7 @@ option(BUILD_TESTS "Should tests be built" ON)
 option(BUILD_UI "Should integration UI be built" OFF)
 option(BUILD_LUAJIT "Should static LuaJIT be used instead of system Lua" ON)
 option(BUILD_MANYLINUX "Should use static libraries compatible with manylinux1" OFF)
+option(BUILD_C "Build C API" OFF)
 
 set(BUILD_PYTHON ON CACHE BOOL "Build Python module")
 mark_as_advanced(BUILD_PYTHON)
@@ -285,6 +286,19 @@ if(BUILD_PYTHON)
     target_link_libraries(retro retro-base ${PYBIND_LIBS} ${STATIC_LDFLAGS})
 endif()
 
+if(BUILD_C)
+    add_library(retro-c SHARED src/retro-c.cpp)
+    set_target_properties(retro-c PROPERTIES 
+        OUTPUT_NAME retro
+        CXX_VISIBILITY_PRESET default)
+    if(WIN32)
+        if(CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64" OR CMAKE_SYSTEM_PROCESSOR STREQUAL "AMD64")
+            add_definitions(-DMS_WIN64)
+        endif()
+    endif()
+    target_link_libraries(retro-c retro-base ${STATIC_LDFLAGS})
+endif()
+
 if(BUILD_TESTS)
     enable_testing()
     add_subdirectory(third-party/gtest/googlemock)

src/coreinfo.cpp

@@ -108,7 +108,7 @@ bool loadCoreInfo(const string& jsonData) {
 		for (auto ext = core->at("ext").cbegin(); ext != core->at("ext").cend(); ++ext) {
 			s_extensionToCore[*ext] = core.key();
 		}
-		s_coreToLib[core.key()] = core->at("lib");
+		s_coreToLib[core.key()] = core->at("lib").get<string>();
 	}
 	return true;
 }

src/emulator.cpp

@@ -12,6 +12,7 @@
 #include "data.h"
 #include "emulator.h"
 #include "libretro.h"
+#include "utils.h"
 
 #ifndef _WIN32
 #define GETSYM dlsym
@@ -360,7 +361,7 @@ bool Emulator::cbEnvironment(unsigned cmd, void* data) {
 		return false;
 	}
 	case RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY:
-		*reinterpret_cast<const char**>(data) = corePath().c_str();
+		*reinterpret_cast<const char**>(data) = newCString(corePath());
 		return true;
 	case RETRO_ENVIRONMENT_GET_CAN_DUPE:
 		*reinterpret_cast<bool*>(data) = true;