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uctypes: Make PtrType(0) cast the int to pointer

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.. the previous interpretation made the data at address 0
be a pointer.

Additionally, `PtrType(buffer)` is not permitted anymore.
You can use `ctypes.struct(buffer, PtrType)` if you really want
to treat the content of the buffer as a pointer.
This commit is contained in:
Jeff Epler 2025-08-17 14:32:39 -05:00
parent d325558b56
commit 6b69bb4030
1 changed files with 4 additions and 9 deletions
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13
extmod/moductypes.c
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@ -125,17 +125,12 @@ mp_obj_t uctypes_struct_type_make_new(const mp_obj_type_t *type_in, size_t n_arg
mp_buffer_info_t bufinfo;
if (is_ptr(desc)) {
bufinfo.len = size;
if (n_args != 1) {
bufinfo.buf = 0;
if (n_args > 1) {
mp_raise_TypeError(NULL);
}
if (mp_obj_is_int(args[0])) {
void *ptr = (void *)(uintptr_t)mp_obj_get_int_truncated(args[0]);
*(void **)bufinfo.buf = ptr;
} else {
mp_buffer_info_t pointee;
mp_get_buffer_raise(args[0], &pointee, MP_BUFFER_WRITE);
*(void **)bufinfo.buf = pointee.buf;
if (n_args) {
bufinfo.buf = (void *)mp_obj_get_int_truncated(args[0]);
}
} else {
mp_obj_t bytearray = mp_obj_new_bytearray(size, NULL);