Stop using c++ (#600)

Python 3.13a6+ & C++ & Cython cause compile error on some compilers.

.github/workflows/test.yml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       matrix:
         os: ["ubuntu-latest", "windows-latest", "macos-latest"]
-        py: ["3.12", "3.11", "3.10", "3.9", "3.8"]
+        py: ["3.13-dev", "3.12", "3.11", "3.10", "3.9", "3.8"]
 
     runs-on: ${{ matrix.os }}
     name: Run test with Python ${{ matrix.py }} on ${{ matrix.os }}

Makefile

@@ -22,7 +22,7 @@ pyupgrade:
 
 .PHONY: cython
 cython:
-	cython --cplus msgpack/_cmsgpack.pyx
+	cython msgpack/_cmsgpack.pyx
 
 .PHONY: test
 test: cython

msgpack/_unpacker.pyx

@@ -35,7 +35,7 @@ cdef extern from "unpack.h":
         PyObject* timestamp_t
         PyObject *giga;
         PyObject *utc;
-        char *unicode_errors
+        const char *unicode_errors
         Py_ssize_t max_str_len
         Py_ssize_t max_bin_len
         Py_ssize_t max_array_len

msgpack/pack.h

@@ -24,6 +24,8 @@
 
 #ifdef __cplusplus
 extern "C" {
+#else
+#define bool char
 #endif
 
 typedef struct msgpack_packer {

msgpack/unpack_container_header.h

@@ -0,0 +1,51 @@
+static inline int unpack_container_header(unpack_context* ctx, const char* data, Py_ssize_t len, Py_ssize_t* off)
+{
+    assert(len >= *off);
+    uint32_t size;
+    const unsigned char *const p = (unsigned char*)data + *off;
+
+#define inc_offset(inc) \
+    if (len - *off < inc) \
+        return 0; \
+    *off += inc;
+
+    switch (*p) {
+    case var_offset:
+        inc_offset(3);
+        size = _msgpack_load16(uint16_t, p + 1);
+        break;
+    case var_offset + 1:
+        inc_offset(5);
+        size = _msgpack_load32(uint32_t, p + 1);
+        break;
+#ifdef USE_CASE_RANGE
+    case fixed_offset + 0x0 ... fixed_offset + 0xf:
+#else
+    case fixed_offset + 0x0:
+    case fixed_offset + 0x1:
+    case fixed_offset + 0x2:
+    case fixed_offset + 0x3:
+    case fixed_offset + 0x4:
+    case fixed_offset + 0x5:
+    case fixed_offset + 0x6:
+    case fixed_offset + 0x7:
+    case fixed_offset + 0x8:
+    case fixed_offset + 0x9:
+    case fixed_offset + 0xa:
+    case fixed_offset + 0xb:
+    case fixed_offset + 0xc:
+    case fixed_offset + 0xd:
+    case fixed_offset + 0xe:
+    case fixed_offset + 0xf:
+#endif
+        ++*off;
+        size = ((unsigned int)*p) & 0x0f;
+        break;
+    default:
+        PyErr_SetString(PyExc_ValueError, "Unexpected type header on stream");
+        return -1;
+    }
+    unpack_callback_uint32(&ctx->user, size, &ctx->stack[0].obj);
+    return 1;
+}
+

msgpack/unpack_template.h

@@ -75,8 +75,7 @@ static inline void unpack_clear(unpack_context *ctx)
     Py_CLEAR(ctx->stack[0].obj);
 }
 
-template <bool construct>
+static inline int unpack_execute(bool construct, unpack_context* ctx, const char* data, Py_ssize_t len, Py_ssize_t* off)
-static inline int unpack_execute(unpack_context* ctx, const char* data, Py_ssize_t len, Py_ssize_t* off)
 {
     assert(len >= *off);
 
@@ -386,6 +385,7 @@ _end:
 #undef construct_cb
 }
 
+#undef NEXT_CS
 #undef SWITCH_RANGE_BEGIN
 #undef SWITCH_RANGE
 #undef SWITCH_RANGE_DEFAULT
@@ -397,68 +397,27 @@ _end:
 #undef again_fixed_trail_if_zero
 #undef start_container
 
-template <unsigned int fixed_offset, unsigned int var_offset>
+static int unpack_construct(unpack_context *ctx, const char *data, Py_ssize_t len, Py_ssize_t *off) {
-static inline int unpack_container_header(unpack_context* ctx, const char* data, Py_ssize_t len, Py_ssize_t* off)
+    return unpack_execute(1, ctx, data, len, off);
-{
+}
-    assert(len >= *off);
+static int unpack_skip(unpack_context *ctx, const char *data, Py_ssize_t len, Py_ssize_t *off) {
-    uint32_t size;
+    return unpack_execute(0, ctx, data, len, off);
-    const unsigned char *const p = (unsigned char*)data + *off;
-
-#define inc_offset(inc) \
-    if (len - *off < inc) \
-        return 0; \
-    *off += inc;
-
-    switch (*p) {
-    case var_offset:
-        inc_offset(3);
-        size = _msgpack_load16(uint16_t, p + 1);
-        break;
-    case var_offset + 1:
-        inc_offset(5);
-        size = _msgpack_load32(uint32_t, p + 1);
-        break;
-#ifdef USE_CASE_RANGE
-    case fixed_offset + 0x0 ... fixed_offset + 0xf:
-#else
-    case fixed_offset + 0x0:
-    case fixed_offset + 0x1:
-    case fixed_offset + 0x2:
-    case fixed_offset + 0x3:
-    case fixed_offset + 0x4:
-    case fixed_offset + 0x5:
-    case fixed_offset + 0x6:
-    case fixed_offset + 0x7:
-    case fixed_offset + 0x8:
-    case fixed_offset + 0x9:
-    case fixed_offset + 0xa:
-    case fixed_offset + 0xb:
-    case fixed_offset + 0xc:
-    case fixed_offset + 0xd:
-    case fixed_offset + 0xe:
-    case fixed_offset + 0xf:
-#endif
-        ++*off;
-        size = ((unsigned int)*p) & 0x0f;
-        break;
-    default:
-        PyErr_SetString(PyExc_ValueError, "Unexpected type header on stream");
-        return -1;
-    }
-    unpack_callback_uint32(&ctx->user, size, &ctx->stack[0].obj);
-    return 1;
 }
 
-#undef SWITCH_RANGE_BEGIN
+#define unpack_container_header read_array_header
-#undef SWITCH_RANGE
+#define fixed_offset 0x90
-#undef SWITCH_RANGE_DEFAULT
+#define var_offset 0xdc
-#undef SWITCH_RANGE_END
+#include "unpack_container_header.h"
+#undef unpack_container_header
+#undef fixed_offset
+#undef var_offset
 
-static const execute_fn unpack_construct = &unpack_execute<true>;
+#define unpack_container_header read_map_header
-static const execute_fn unpack_skip = &unpack_execute<false>;
+#define fixed_offset 0x80
-static const execute_fn read_array_header = &unpack_container_header<0x90, 0xdc>;
+#define var_offset 0xde
-static const execute_fn read_map_header = &unpack_container_header<0x80, 0xde>;
+#include "unpack_container_header.h"
-
+#undef unpack_container_header
-#undef NEXT_CS
+#undef fixed_offset
+#undef var_offset
 
 /* vim: set ts=4 sw=4 sts=4 expandtab  */

setup.py

@@ -25,7 +25,7 @@ def cythonize(src):
     if not have_cython:
         raise Exception("Cython is required for building from checkout")
     sys.stderr.write(f"cythonize: {src!r}\n")
-    cython_compiler.compile([src], cplus=True)
+    cython_compiler.compile([src])
 
 
 def ensure_source(src):
@@ -51,17 +51,17 @@ class Sdist(sdist):
 
 libraries = []
 macros = []
+ext_modules = []
 
 if sys.platform == "win32":
     libraries.append("ws2_32")
     macros = [("__LITTLE_ENDIAN__", "1")]
 
-ext_modules = []
 if not PYPY and not os.environ.get("MSGPACK_PUREPYTHON"):
     ext_modules.append(
         Extension(
             "msgpack._cmsgpack",
-            sources=["msgpack/_cmsgpack.cpp"],
+            sources=["msgpack/_cmsgpack.c"],
             libraries=libraries,
             include_dirs=["."],
             define_macros=macros,