uuid: port for Windows

This adjusts the UUID code to build on Windows which is needed for the
Foundation port itself.

Author: compnerd

CMakeLists.txt

@@ -68,6 +68,13 @@ set_target_properties(uuid
 target_compile_options(uuid
                        PUBLIC
                          -I${install_dir}/System/Library/Frameworks/CoreFoundation.framework/Headers)
+if(CMAKE_SYSTEM_NAME STREQUAL Windows)
+  target_compile_definitions(uuid
+                             PRIVATE
+                               _CRT_NONSTDC_NO_WARNINGS
+                               _CRT_SECURE_NO_DEPRECATE
+                               _CRT_SECURE_NO_WARNINGS)
+endif()
 add_dependencies(uuid CoreFoundation)
 
 set(swift_optimization_flags)

uuid/uuid.c

@@ -35,7 +35,11 @@
 #include <stdint.h>
 #include <string.h>
 #include <fcntl.h>
+#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
 #include <unistd.h>
+#elif defined(_WIN32)
+#include <io.h>
+#endif
 #include <stdio.h>
 
 #if TARGET_OS_MAC
@@ -61,9 +65,25 @@ static inline void nanotime(struct timespec *tv) {
 	clock_gettime(CLOCK_MONOTONIC, tv);
 }
 
+#elif TARGET_OS_WINDOWS
+#include <time.h>
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+static inline void nanotime(struct timespec *tv) {
+  FILETIME ftTime;
+
+  GetSystemTimePreciseAsFileTime(&ftTime);
+
+  uint64_t Value = (((uint64_t)ftTime.dwHighDateTime << 32) | ftTime.dwLowDateTime);
+
+  tv->tv_sec = Value / 1000000000;
+  tv->tv_nsec = Value - (tv->tv_sec * 1000000000);
+}
 #endif
 
-static inline void read_random(void *buffer, u_int numBytes) {
+static inline void read_random(void *buffer, unsigned numBytes) {
     int fd = open("/dev/urandom", O_RDONLY);
     read(fd, buffer, numBytes);
     close(fd);
@@ -227,4 +247,4 @@ void
 uuid_unparse(const uuid_t uu, uuid_string_t out)
 {
 	uuid_unparse_upper(uu, out);
-}
+}