core: Simplify setting of dummy versions.

* src/engine.c (_gpgme_engine_info_release): Do not assert but free
FILE_NAME.
(gpgme_get_engine_info): Provide default for VERSION and REQ_VERSION.
Use calloc instead of malloc.
(_gpgme_set_engine_info): Ditto.
* src/engine-assuan.c (llass_get_version): Return NULL.
(llass_get_req_version): Ditto.
* src/engine-spawn.c (engspawn_get_version): Ditto.
(engspawn_get_req_version): Ditto.
* src/engine-uiserver.c (uiserver_get_version): Ditto.
(uiserver_get_req_version): Ditto.

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

src/engine-assuan.c

@@ -131,14 +131,14 @@ llass_get_home_dir (void)
 static char *
 llass_get_version (const char *file_name)
 {
-  return strdup ("1.0.0");
+  return NULL;
 }
 
 
 static const char *
 llass_get_req_version (void)
 {
-  return "1.0.0";
+  return NULL;
 }
 
 

src/engine-spawn.c

@@ -312,14 +312,14 @@ static char *
 engspawn_get_version (const char *file_name)
 {
   (void)file_name;
-  return strdup ("1.0.0");
+  return NULL;
 }
 
 
 static const char *
 engspawn_get_req_version (void)
 {
-  return "1.0.0";
+  return NULL;
 }
 
 

src/engine-uiserver.c

@@ -123,14 +123,15 @@ static void uiserver_io_event (void *engine,
 static char *
 uiserver_get_version (const char *file_name)
 {
-  return strdup ("1.0.0");
+  (void)file_name;
+  return NULL;
 }
 
 
 static const char *
 uiserver_get_req_version (void)
 {
-  return "1.0.0";
+  return NULL;
 }
 
 

src/engine.c

@@ -93,7 +93,8 @@ engine_get_home_dir (gpgme_protocol_t proto)
 
 
 /* Get a malloced string containing the version number of the engine
-   for PROTOCOL.  */
+ * for PROTOCOL.  If this function returns NULL for a valid protocol,
+ * it should be assumed that the engine is a pseudo engine. */
 static char *
 engine_get_version (gpgme_protocol_t proto, const char *file_name)
 {
@@ -107,7 +108,8 @@ engine_get_version (gpgme_protocol_t proto, const char *file_name)
 }
 
 
-/* Get the required version number of the engine for PROTOCOL.  */
+/* Get the required version number of the engine for PROTOCOL.  This
+ * may be NULL. */
 static const char *
 engine_get_req_version (gpgme_protocol_t proto)
 {
@@ -164,8 +166,8 @@ _gpgme_engine_info_release (gpgme_engine_info_t info)
     {
       gpgme_engine_info_t next_info = info->next;
 
-      assert (info->file_name);
-      free (info->file_name);
+      if (info->file_name)
+        free (info->file_name);
       if (info->home_dir)
 	free (info->home_dir);
       if (info->version)
@@ -203,6 +205,7 @@ gpgme_get_engine_info (gpgme_engine_info_t *info)
 	{
 	  const char *ofile_name = engine_get_file_name (proto_list[proto]);
 	  const char *ohome_dir  = engine_get_home_dir (proto_list[proto]);
+          char *version = engine_get_version (proto_list[proto], NULL);
 	  char *file_name;
 	  char *home_dir;
 
@@ -222,10 +225,18 @@ gpgme_get_engine_info (gpgme_engine_info_t *info)
           else
             home_dir = NULL;
 
-	  *lastp = malloc (sizeof (*engine_info));
+	  *lastp = calloc (1, sizeof (*engine_info));
           if (!*lastp && !err)
             err = gpg_error_from_syserror ();
 
+          /* Now set the dummy version for pseudo engines.  */
+          if (!err && !version)
+            {
+              version = strdup ("1.0.0");
+              if (!version)
+                err = gpg_error_from_syserror ();
+            }
+
 	  if (err)
 	    {
 	      _gpgme_engine_info_release (engine_info);
@@ -235,6 +246,8 @@ gpgme_get_engine_info (gpgme_engine_info_t *info)
 		free (file_name);
 	      if (home_dir)
 		free (home_dir);
+	      if (version)
+		free (version);
 
 	      UNLOCK (engine_info_lock);
 	      return err;
@@ -243,8 +256,10 @@ gpgme_get_engine_info (gpgme_engine_info_t *info)
 	  (*lastp)->protocol = proto_list[proto];
 	  (*lastp)->file_name = file_name;
 	  (*lastp)->home_dir = home_dir;
-	  (*lastp)->version = engine_get_version (proto_list[proto], NULL);
+	  (*lastp)->version = version;
 	  (*lastp)->req_version = engine_get_req_version (proto_list[proto]);
+	  if (!(*lastp)->req_version)
+            (*lastp)->req_version = "1.0.0"; /* Dummy for pseudo engines. */
 	  (*lastp)->next = NULL;
 	  lastp = &(*lastp)->next;
 	}
@@ -353,6 +368,7 @@ _gpgme_set_engine_info (gpgme_engine_info_t info, gpgme_protocol_t proto,
 {
   char *new_file_name;
   char *new_home_dir;
+  char *new_version;
 
   /* FIXME: Use some PROTO_MAX definition.  */
   if (proto > DIM (engine_ops))
@@ -401,6 +417,17 @@ _gpgme_set_engine_info (gpgme_engine_info_t info, gpgme_protocol_t proto,
         new_home_dir = NULL;
     }
 
+  new_version = engine_get_version (proto, new_file_name);
+  if (!new_version)
+    {
+      new_version = strdup ("1.0.0"); /* Fake one for dummy entries.  */
+      if (!new_version)
+        {
+          free (new_file_name);
+          free (new_home_dir);
+        }
+    }
+
   /* Remove the old members.  */
   assert (info->file_name);
   free (info->file_name);
@@ -412,7 +439,7 @@ _gpgme_set_engine_info (gpgme_engine_info_t info, gpgme_protocol_t proto,
   /* Install the new members.  */
   info->file_name = new_file_name;
   info->home_dir = new_home_dir;
-  info->version = engine_get_version (proto, new_file_name);
+  info->version = new_version;
 
   return 0;
 }

src/version.c

@@ -124,7 +124,7 @@ parse_version_number (const char *str, int *number)
 /* Parse the version string STR in the format MAJOR.MINOR.MICRO (for
    example, 9.3.2) and return the components in MAJOR, MINOR and MICRO
    as integers.  The function returns the tail of the string that
-   follows the version number.  This might be te empty string if there
+   follows the version number.  This might be the empty string if there
    is nothing following the version number, or a patchlevel.  The
    function returns NULL if the version string is not valid.  */
 static const char *