[ctrtool] Fix compile errors

And comparisons which would have always returned false.

ctrtool/Makefile

@@ -3,12 +3,27 @@ SRC_DIR = . polarssl tinyxml
 OBJS = $(foreach dir,$(SRC_DIR),$(subst .c,.o,$(wildcard $(dir)/*.c))) $(foreach dir,$(SRC_DIR),$(subst .cpp,.o,$(wildcard $(dir)/*.cpp)))
 
 # Compiler Settings
-LIBS = -static-libgcc -static-libstdc++
-CXXFLAGS = -I. 
-CFLAGS = -O2 -flto -Wall -Wno-unused-variable -Wno-unused-but-set-variable -Wno-unused-result -I.
 OUTPUT = ctrtool
+CXXFLAGS = -I.
+CFLAGS = -O2 -flto -Wall -Wno-unused-variable  -Wno-unused-result -I.
 CC = gcc
 CXX = g++
+ifeq ($(OS),Windows_NT)
+    #Windows Build CFG
+    CFLAGS += -Wno-unused-but-set-variable
+    LIBS += -static-libgcc -static-libstdc++
+else
+    UNAME_S := $(shell uname -s)
+    ifeq ($(UNAME_S),Darwin)
+        # OS X
+        CFLAGS += -Wno-unused-local-typedef
+        LIBS += -liconv
+    else
+        # Linux
+        CFLAGS += -Wno-unused-but-set-variable
+        LIBS +=
+    endif
+endif
 
 main: $(OBJS)
 	$(CXX) -o $(OUTPUT) $(LIBS) $(OBJS)

ctrtool/stream.c

@@ -119,7 +119,7 @@ int stream_out_flush(stream_out_context* ctx)
 	if (ctx->outbufferpos > 0)
 	{
 		size_t writtenbytes = fwrite(ctx->outbuffer, 1, ctx->outbufferpos, ctx->outfile);
-		if (writtenbytes < 0)
+		if (writtenbytes == 0) // will be zero if nothing is written
 			return 0;
 
 

ctrtool/utils.h

@@ -46,8 +46,10 @@ inline int fseeko64(FILE *__stream, long long __off, int __whence)
 {
 	return _fseeki64(__stream, __off, __whence);
 }
-#else
-extern int fseeko64 (FILE *__stream, off64_t __off, int __whence);
+#elif __APPLE__
+    #define fseeko64 fseek // OS X file I/O is 64bit
+#elif __linux__
+    extern int fseeko64 (FILE *__stream, __off64_t __off, int __whence);
 #endif
 
 #ifdef __cplusplus