Merge pull request #318 from trim21/ub

avoid undefined behavior signed int overflow

CMakeLists.txt

@@ -16,10 +16,13 @@ else()
     message(WARNING ">> IPO disabled. You will not get the best performance.")
 endif()
 
+if(WIN32)
+    add_definitions(-D_CRT_SECURE_NO_WARNINGS)
+endif()
+
 if(MSVC)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /utf-8 /jumptablerdata /GS-")
     add_compile_options(/wd4267 /wd4244)
-    add_definitions(-D_CRT_SECURE_NO_WARNINGS)
 
     if(NOT CMAKE_BUILD_TYPE STREQUAL "Debug")
         set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /Ox")

src/modules/os.c

@@ -8,6 +8,7 @@
 
 #if PY_SYS_PLATFORM == 0
 #include <direct.h>
+#include <io.h>
 
 int platform_chdir(const char* path) { return _chdir(path); }
 

src/modules/pickle.c

@@ -80,13 +80,13 @@ static void pkl__emit_int(PickleObject* buf, py_i64 val) {
         pkl__emit_op(buf, PKL_INT_0 + val);
         return;
     }
-    if((int8_t)val == val) {
+    if(INT8_MIN <= val && val <= INT8_MAX) {
         pkl__emit_op(buf, PKL_INT8);
         PickleObject__write_bytes(buf, &val, 1);
-    } else if((int16_t)val == val) {
+    } else if(INT16_MIN <= val && val <= INT16_MAX) {
         pkl__emit_op(buf, PKL_INT16);
         PickleObject__write_bytes(buf, &val, 2);
-    } else if((int32_t)val == val) {
+    } else if(INT32_MIN <= val && val <= INT32_MAX) {
         pkl__emit_op(buf, PKL_INT32);
         PickleObject__write_bytes(buf, &val, 4);
     } else {