agent: Use different translation func for Pinentry strings.

* po/Makevars (XGETTEXT_OPTIONS): Add keyword "L_".
* common/i18n.c (i18n_localegettext): New stub.
* common/i18n.h: Expand the LunderscoreIMPL macro.
* agent/agent.h (L_): New.
(LunderscoreIMPL): New.
* agent/call-pinentry.c (setup_qualitybar): Add arg ctrl anc change
caller.
* agent/findkey.c (try_unprotect_cb): Add local var ctrl.
* agent/genkey.c (check_passphrase_constraints): Replace xtryasprintf
by xtrystrdup to avoid gcc warning.  Unfortinately this changes the
string.
(agent_ask_new_passphrase): Cleanup the use of initial_errtext.
--

Static strings in gpg-agent need to be translated according to the
locale set by the caller.  This is required so that a gpg-agent can be
started in one locale and a gpg can be run in another.  If we don't do
this the static strings (prompt, buttons) are not or in the wrong
locale translated while dynamic strings (e.g. key description) uses
the locale of gpg.

This is only the first part of the change the actual local switching
still needs to be implemented.

Debian-bug-id: 788983
Signed-off-by: Werner Koch <wk@gnupg.org>

agent/agent.h

@@ -295,6 +295,21 @@ cache_mode_t;
 typedef int (*lookup_ttl_t)(const char *hexgrip);
 
 
+/* This is a special version of the usual _() gettext macro.  It
+   assumes a server connection control variable with the name "ctrl"
+   and uses that to translate a string according to the locale set for
+   the connection.  The macro LunderscoreIMPL is used by i18n to
+   actually define the inline function when needed.  */
+#define L_(a) agent_Lunderscore (ctrl, (a))
+#define LunderscoreIMPL                                         \
+  static inline const char *                                    \
+  agent_Lunderscore (ctrl_t ctrl, const char *string)           \
+  {                                                             \
+    return ctrl? i18n_localegettext (ctrl->lc_messages, string) \
+      /*     */: gettext (string);                              \
+  }
+
+
 /*-- gpg-agent.c --*/
 void agent_exit (int rc) GPGRT_GCC_A_NR; /* Also implemented in other tools */
 gpg_error_t agent_copy_startup_env (ctrl_t ctrl);