Use dedicated union member for option offsets

[users/jgh/exim.git] / src / src / local_scan.h

diff --git a/src/src/local_scan.h b/src/src/local_scan.h
index da9a8911adbc703d4971bd9b882807604b8c7b7a..7243f6afcc32506423ab52deecb047168767b92a 100644 (file)
--- a/src/src/local_scan.h
+++ b/src/src/local_scan.h
@@ -2,14 +2,19 @@
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
-/* Copyright (c) University of Cambridge 1995 - 2018 */
+/* Copyright (c) University of Cambridge 1995 - 2020 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 /* This file is the header that is the only Exim header to be included in the
 source for the local_scan.c() function. It contains definitions that are made
-available for use in that function, and which are documented.
+available for use in that function, and which are documented.  That source
+should first #define LOCAL_SCAN
 
-This API is also used for functions called by the ${dlfunc expansion item. */
+This API is also used for functions called by the ${dlfunc expansion item.
+Source for those should first #define DLFUNC_IMPL and then include this file.
+Coders of dlfunc routines should read the notes on tainting at the start of
+store.c
+*/
 
 
 /* Some basic types that make some things easier, the Exim configuration
@@ -98,8 +103,8 @@ ABI is changed in a non backward compatible way. The minor number is increased
 each time a new feature is added (in a way that doesn't break backward
 compatibility). */
 
-#define LOCAL_SCAN_ABI_VERSION_MAJOR 3
-#define LOCAL_SCAN_ABI_VERSION_MINOR 1
+#define LOCAL_SCAN_ABI_VERSION_MAJOR 4
+#define LOCAL_SCAN_ABI_VERSION_MINOR 0
 #define LOCAL_SCAN_ABI_VERSION \
   LOCAL_SCAN_ABI_VERSION_MAJOR.LOCAL_SCAN_ABI_VERSION_MINOR
 
@@ -115,10 +120,15 @@ typedef struct header_line {
 /* Entries in lists options are in this form. */
 
 typedef struct {
-  const char   *name; /* should have been uschar but too late now */
-  int           type;
-  void         *value;
+  const char * name; /* should have been uschar but too late now */
+  int          type;
+  union {
+    void *     value;
+    long       offset;
+    void (*    fn)();
+  } v;
 } optionlist;
+#define OPT_OFF(s, field) {.offset = offsetof(s, field)}
 
 /* Structure for holding information about an envelope address. The errors_to
 field is always NULL except for one_time aliases that had errors_to on the