comparison mercurial/dirs.c @ 30159:fb5504d7b2c9

dirs: document Py_SIZE weirdness

Assigning to what looks like a function is clown shoes. Document that
it is a macro referring to a struct member.

30158:1baa0e2cfc37

			key = PyBytes_FromStringAndSize(cpath,
							 pos < 2 ? 2 : pos);
			if (key == NULL)
				goto bail;
		}
		Py_SIZE(key) = pos;
		((PyBytesObject *)key)->ob_sval[pos] = '\0';

		val = PyDict_GetItem(dirs, key);
		if (val != NULL) {

30159:fb5504d7b2c9

			key = PyBytes_FromStringAndSize(cpath,
							 pos < 2 ? 2 : pos);
			if (key == NULL)
				goto bail;
		}
		/* Py_SIZE(o) refers to the ob_size member of the struct. Yes,
		* assigning to what looks like a function seems wrong. */
		Py_SIZE(key) = pos;
		((PyBytesObject *)key)->ob_sval[pos] = '\0';

		val = PyDict_GetItem(dirs, key);
		if (val != NULL) {