Add FreeBSD support

At the moment the platform specific code supports only
FreeBSD as OpenBSD and NetBSD does not support the
full path retrieval for an executable, we intentionally
stop the compilation for those platforms.

CMakeLists.txt

@@ -326,7 +326,7 @@ endif (NOT DISABLE_HTTP_TWITCH)
 
 PKG_CHECK_MODULES(SPEEX REQUIRED speexdsp)
 
-if (UNIX)
+if (UNIX AND NOT ${CMAKE_SYSTEM_NAME} MATCHES "BSD")
 	# Include libdl for dlopen
 	set(DLLIB dl)
 endif (UNIX)
@@ -384,7 +384,7 @@ TARGET_LINK_LIBRARIES(${PROJECT} ${GLLIBS})
 # if creating a static binary, precede libraries with -static, then name all the libs
 TARGET_LINK_LIBRARIES(${PROJECT} ${STATIC_START} ${SDL2LIBS} ${HTTPLIBS} ${NETWORKLIBS} ${SPEEX_LIBRARIES} ${DLLIB} ${REQUIREDLIBS} ${BREAKPAD_LIBS})
 
-if (APPLE OR STATIC)
+if (APPLE OR STATIC OR ${CMAKE_SYSTEM_NAME} MATCHES "BSD")
 	FIND_LIBRARY(ICONV_LIBRARIES NAMES iconv libiconv libiconv-2 c)
 	TARGET_LINK_LIBRARIES(${PROJECT} ${ICONV_LIBRARIES})
 endif (APPLE OR STATIC)

src/network/TcpSocket.cpp

@@ -44,6 +44,7 @@
     #include <arpa/inet.h>
     #include <netdb.h>
     #include <netinet/tcp.h>
+    #include <netinet/in.h>
     #include <sys/socket.h>
     #include <fcntl.h>
     typedef int SOCKET;

src/platform/linux.c

@@ -16,7 +16,13 @@
 
 #include "../common.h"
 
-#ifdef __LINUX__
+// Despite the name, this file contains support for more OSs besides Linux, provided the necessary ifdefs remain small.
+// Otherwise, they should be spun off into their own files.
+#if defined(__LINUX__) || defined(__FREEBSD__)
+
+#ifdef __FREEBSD__
+#include <sys/sysctl.h>
+#endif
 
 #include <ctype.h>
 #include <dlfcn.h>
@@ -49,12 +55,23 @@ typedef enum { DT_NONE, DT_KDIALOG, DT_ZENITY } dialog_type;
 void platform_get_exe_path(utf8 *outPath, size_t outSize)
 {
 	char exePath[MAX_PATH];
+#ifdef __LINUX__
 	ssize_t bytesRead;
 	bytesRead = readlink("/proc/self/exe", exePath, MAX_PATH);
 	if (bytesRead == -1) {
 		log_fatal("failed to read /proc/self/exe");
 	}
 	exePath[bytesRead - 1] = '\0';
+#elif __FREEBSD__
+	size_t exeLen = sizeof(exePath);
+	const int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
+	if (sysctl(mib, 4, exePath, &exeLen, NULL, 0) == -1) {
+		log_fatal("failed to get process path");
+
+	}
+#else
+#error "Platform does not support full path exe retrieval"
+#endif
 	char *exeDelimiter = strrchr(exePath, *PATH_SEPARATOR);
 	if (exeDelimiter == NULL)
 	{

src/platform/platform.h

@@ -229,7 +229,7 @@ void core_init();
 	__declspec(dllexport) int StartOpenRCT(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow);
 #endif // __WINDOWS__
 
-#if defined(__LINUX__) || defined(__MACOSX__)
+#if defined(__LINUX__) || defined(__MACOSX__) || defined(__FREEBSD__)
 	void platform_posix_sub_user_data_path(char *buffer, size_t size, const char *homedir);
 	void platform_posix_sub_resolve_openrct_data_path(utf8 *out, size_t size);
 #endif

src/platform/posix.c

@@ -14,7 +14,7 @@
  *****************************************************************************/
 #pragma endregion
 
-#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
+#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__FreeBSD__)
 
 #include <dirent.h>
 #include <errno.h>

src/version.h

@@ -48,6 +48,9 @@
 #ifdef __MACOSX__
 	#define OPENRCT2_PLATFORM		"macOS"
 #endif
+#ifdef __FREEBSD__
+	#define OPENRCT2_PLATFORM		"FreeBSD"
+#endif
 #ifndef OPENRCT2_PLATFORM
 	#error Unknown platform!
 #endif