Add function gpgme_signers_count.

* src/signers.c (gpgme_signers_count): New.
* src/libgpgme.vers, src/gpgme.def: Add as external symbol.
* src/gpgme.h.in: Add prototype.

6 files changed, 23 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index 3b8fea3f..55c8660d 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,10 @@
 Noteworthy changes in version 1.4.3 (unreleased)
 ------------------------------------------------
 
+ * Interface changes relative to the 1.4.2 release:
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ gpgme_signers_count            NEW.
+
 
 Noteworthy changes in version 1.4.2 (2013-05-28)
 ------------------------------------------------
diff --git a/doc/gpgme.texi b/doc/gpgme.texi
index 217dc13a..1a193706 100644
--- a/doc/gpgme.texi
+++ b/doc/gpgme.texi
@@ -4785,6 +4785,11 @@ list of signers in the context @var{ctx}.
 Calling this function acquires an additional reference for the key.
 @end deftypefun
 
+@deftypefun @w{unsigned int} gpgme_signers_count (@w{const gpgme_ctx_t @var{ctx}})
+The function @code{gpgme_signers_count} returns the number of signer keys in
+the context @var{ctx}.
+@end deftypefun
+
 @deftypefun gpgme_key_t gpgme_signers_enum (@w{const gpgme_ctx_t @var{ctx}}, @w{int @var{seq}})
 The function @code{gpgme_signers_enum} returns the @var{seq}th key in
 the list of signers in the context @var{ctx}.  An additional reference
diff --git a/src/gpgme.def b/src/gpgme.def
index 3a6e0e3e..7610d37e 100644
--- a/src/gpgme.def
+++ b/src/gpgme.def
@@ -209,5 +209,7 @@ EXPORTS
     gpgme_set_pinentry_mode               @158
     gpgme_get_pinentry_mode               @159
 
+    gpgme_signers_count                   @160
+
 ; END
 
diff --git a/src/gpgme.h.in b/src/gpgme.h.in
index 11780d11..f644a509 100644
--- a/src/gpgme.h.in
+++ b/src/gpgme.h.in
@@ -934,6 +934,9 @@ void gpgme_signers_clear (gpgme_ctx_t ctx);
 /* Add KEY to list of signers in CTX.  */
 gpgme_error_t gpgme_signers_add (gpgme_ctx_t ctx, const gpgme_key_t key);
 
+/* Return the number of signers in CTX.  */
+unsigned int gpgme_signers_count (const gpgme_ctx_t ctx);
+
 /* Return the SEQth signer's key in CTX.  */
 gpgme_key_t gpgme_signers_enum (const gpgme_ctx_t ctx, int seq);
 
diff --git a/src/libgpgme.vers b/src/libgpgme.vers
index 358b63c7..0b2e89db 100644
--- a/src/libgpgme.vers
+++ b/src/libgpgme.vers
@@ -143,6 +143,7 @@ GPGME_1.0 {
     gpgme_set_textmode;
     gpgme_signers_add;
     gpgme_signers_clear;
+    gpgme_signers_count;
     gpgme_signers_enum;
 
     gpgme_key_ref;
diff --git a/src/signers.c b/src/signers.c
index 88f923c5..f43fafc7 100644
--- a/src/signers.c
+++ b/src/signers.c
@@ -93,6 +93,14 @@ gpgme_signers_add (gpgme_ctx_t ctx, const gpgme_key_t key)
 }
 
 
+/* Return the number of signers in CTX.  */
+unsigned int
+gpgme_signers_count (const gpgme_ctx_t ctx)
+{
+  return ctx? ctx->signers_len : 0;
+}
+
+
 /* Return the SEQth signer's key in CTX with one reference.  */
 gpgme_key_t
 gpgme_signers_enum (const gpgme_ctx_t ctx, int seq)