scd: Add some compatibility code for easier backporting.

* scd/app-common.h (APP_WRITEKEY_FLAG_FORCE): New.
(APP_READKEY_FLAG_INFO): New.
(APP_LEARN_FLAG_KEYPAIRINFO): New.
(APP_LEARN_FLAG_MULTI): New.
(struct app_ctx_s): New forward declaration.
(struct app_ctx_s): Add members prep_reselect, reselect, and
with_keygrip.
(KEYGRIP_ACTION_SEND_DATA): New.
(KEYGRIP_ACTION_WRITE_STATUS): New.
(KEYGRIP_ACTION_LOOKUP): New.
(APP_CARD): New macro.
* scd/scdaemon.h: Include app-common.h and remove from all other
files.
(app_t): Move typedef to ...
* scd/app-common.h: here.
--

These changes will make it easier to backport changes from 2.3 to 2.2.

Signed-off-by: Werner Koch <wk@gnupg.org>

scd/app-common.h

@@ -33,12 +33,26 @@
 /* Flags used with app_genkey.  */
 #define APP_GENKEY_FLAG_FORCE    1  /* Force overwriting existing key.  */
 
+/* Flags used with app_writekey.  */
+#define APP_WRITEKEY_FLAG_FORCE  1  /* Force overwriting existing key.  */
+
+/* Flags used with app_readkey.  */
+#define APP_READKEY_FLAG_INFO    1  /* Send also a KEYPAIRINFO line.  */
+
 /* Bit flags set by the decipher function into R_INFO.  */
 #define APP_DECIPHER_INFO_NOPAD  1  /* Padding has been removed.  */
 
+/* Flags used by the app_write_learn_status.  */
+#define APP_LEARN_FLAG_KEYPAIRINFO  1 /* Return only keypair infos.  */
+#define APP_LEARN_FLAG_MULTI        2 /* Return info for all apps.  */
 
+
+/* Forward declarations.  */
+struct app_ctx_s;
 struct app_local_s;  /* Defined by all app-*.c.  */
 
+typedef struct app_ctx_s *app_t;
+
 struct app_ctx_s {
   struct app_ctx_s *next;
 
@@ -67,6 +81,11 @@ struct app_ctx_s {
   struct app_local_s *app_local;  /* Local to the application. */
   struct {
     void (*deinit) (app_t app);
+
+    /* prep_reselect and reselect are not used in this version of scd.  */
+    gpg_error_t (*prep_reselect) (app_t app, ctrl_t ctrl);
+    gpg_error_t (*reselect) (app_t app, ctrl_t ctrl);
+
     gpg_error_t (*learn_status) (app_t app, ctrl_t ctrl, unsigned int flags);
     gpg_error_t (*readcert) (app_t app, const char *certid,
                      unsigned char **cert, size_t *certlen);
@@ -116,10 +135,24 @@ struct app_ctx_s {
     gpg_error_t (*check_pin) (app_t app, const char *keyidstr,
                       gpg_error_t (*pincb)(void*, const char *, char **),
                       void *pincb_arg);
+
+    /* with_keygrip is not used in this version of scd but having it
+     * makes back porting app-*.c from later versions easier.  */
+    gpg_error_t (*with_keygrip) (app_t app, ctrl_t ctrl, int action,
+                                 const char *keygrip_str, int capability);
   } fnc;
 };
 
 
+/* Action values for app_do_with_keygrip.  */
+enum
+ {
+  KEYGRIP_ACTION_SEND_DATA,
+  KEYGRIP_ACTION_WRITE_STATUS,
+  KEYGRIP_ACTION_LOOKUP
+ };
+
+
 /* Helper to get the slot from an APP object. */
 static inline int
 app_get_slot (app_t app)
@@ -131,6 +164,10 @@ app_get_slot (app_t app)
   return -1;
 }
 
+/* Macro to access members in app_t which are found in 2.3 in a linked
+ * card_t member.  */
+#define APP_CARD(a) (a)
+
 
 /*-- app-help.c --*/
 unsigned int app_help_count_bits (const unsigned char *a, size_t len);

scd/app-dinsig.c

@@ -81,7 +81,6 @@
 
 #include "../common/i18n.h"
 #include "iso7816.h"
-#include "app-common.h"
 #include "../common/tlv.h"
 
 

scd/app-geldkarte.c

@@ -39,7 +39,6 @@
 
 #include "../common/i18n.h"
 #include "iso7816.h"
-#include "app-common.h"
 #include "../common/tlv.h"
 
 

scd/app-help.c

@@ -24,7 +24,6 @@
 #include <string.h>
 
 #include "scdaemon.h"
-#include "app-common.h"
 #include "iso7816.h"
 #include "../common/tlv.h"
 

scd/app-nks.c

@@ -53,7 +53,6 @@
 #include "scdaemon.h"
 #include "../common/i18n.h"
 #include "iso7816.h"
-#include "app-common.h"
 #include "../common/tlv.h"
 #include "apdu.h"
 #include "../common/host2net.h"

scd/app-openpgp.c

@@ -56,7 +56,6 @@
 #include "../common/util.h"
 #include "../common/i18n.h"
 #include "iso7816.h"
-#include "app-common.h"
 #include "../common/tlv.h"
 #include "../common/host2net.h"
 #include "../common/openpgpdefs.h"

scd/app-p15.c

@@ -40,7 +40,6 @@
 #include "scdaemon.h"
 
 #include "iso7816.h"
-#include "app-common.h"
 #include "../common/i18n.h"
 #include "../common/tlv.h"
 #include "apdu.h" /* fixme: we should move the card detection to a

scd/app-sc-hsm.c

@@ -33,7 +33,6 @@
 #include "scdaemon.h"
 
 #include "iso7816.h"
-#include "app-common.h"
 #include "../common/tlv.h"
 #include "apdu.h"
 

scd/app.c

@@ -26,7 +26,6 @@
 
 #include "scdaemon.h"
 #include "../common/exechelp.h"
-#include "app-common.h"
 #include "iso7816.h"
 #include "apdu.h"
 #include "../common/tlv.h"

scd/command.c

@@ -33,7 +33,6 @@
 #include "scdaemon.h"
 #include <assuan.h>
 #include <ksba.h>
-#include "app-common.h"
 #include "iso7816.h"
 #include "apdu.h" /* Required for apdu_*_reader (). */
 #include "atr.h"

scd/scdaemon.c

@@ -48,7 +48,6 @@
 
 #include "../common/i18n.h"
 #include "../common/sysutils.h"
-#include "app-common.h"
 #include "iso7816.h"
 #include "apdu.h"
 #include "ccid-driver.h"

scd/scdaemon.h

@@ -30,6 +30,8 @@
 #include <gcrypt.h>
 #include "../common/util.h"
 #include "../common/sysutils.h"
+#include "app-common.h"
+
 
 /* To convey some special hash algorithms we use algorithm numbers
    reserved for application use. */
@@ -112,7 +114,6 @@ struct server_control_s
   } in_data;
 };
 
-typedef struct app_ctx_s *app_t;
 
 /*-- scdaemon.c --*/
 void scd_exit (int rc);