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authorGuido van Rossum <guido@python.org>1990-12-20 15:06:42 (GMT)
committerGuido van Rossum <guido@python.org>1990-12-20 15:06:42 (GMT)
commit3f5da24ea304e674a9abbdcffc4d671e32aa70f1 (patch)
treee932e31cb9381f40b7c87c377638216c043b5cfc /Include/structmember.h
parent226d79eb4a776dd54c9e4544b17deaf928bcef3a (diff)
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+/* Interface to map C struct members to Python object attributes */
+
+/* The offsetof() macro calculates the offset of a structure member
+ in its structure. Unfortunately this cannot be written down
+ portably, hence it is provided by a Standard C header file.
+ For pre-Standard C compilers, here is a version that usually works
+ (but watch out!): */
+
+#ifndef offsetof
+#define offsetof(type, member) ( (int) & ((type*)0) -> member )
+#endif
+
+/* An array of memberlist structures defines the name, type and offset
+ of selected members of a C structure. These can be read by
+ getmember() and set by setmember() (except if their READONLY flag
+ is set). The array must be terminated with an entry whose name
+ pointer is NULL. */
+
+struct memberlist {
+ char *name;
+ int type;
+ int offset;
+ int readonly;
+};
+
+/* Types */
+#define T_SHORT 0
+#define T_INT 1
+#define T_LONG 2
+#define T_FLOAT 3
+#define T_DOUBLE 4
+#define T_STRING 5
+#define T_OBJECT 6
+
+/* Readonly flag */
+#define READONLY 1
+#define RO READONLY /* Shorthand */
+
+object *getmember PROTO((char *, struct memberlist *, char *));
+int setmember PROTO((char *, struct memberlist *, char *, object *));