Author: Armin Rigo <[email protected]>
Branch:
Changeset: r624:65a7b2518219
Date: 2012-07-11 09:49 +0200
http://bitbucket.org/cffi/cffi/changeset/65a7b2518219/
Log: ctypes support: structs or unions of size manually forced to 0.
diff --git a/c/_cffi_backend.c b/c/_cffi_backend.c
--- a/c/_cffi_backend.c
+++ b/c/_cffi_backend.c
@@ -2710,7 +2710,7 @@
return NULL;
}
- maxsize = 1;
+ maxsize = 0;
alignment = 1;
offset = 0;
nb_fields = PyList_GET_SIZE(fields);
@@ -2839,12 +2839,14 @@
offset = maxsize;
}
else {
- if (offset == 0)
- offset = 1;
offset = (offset + alignment - 1) & ~(alignment-1);
}
- if (totalsize < 0)
- totalsize = offset;
+ /* Like C, if the size of this structure would be zero, we compute it
+ as 1 instead. But for ctypes support, we allow the manually-
+ specified totalsize to be zero in this case. */
+ if (totalsize < 0) {
+ totalsize = (offset == 0 ? 1 : offset);
+ }
else if (totalsize < offset) {
PyErr_Format(PyExc_TypeError,
"%s cannot be of size %zd: there are fields at least "
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