OSSL_STORE: Add OSSL_STORE_vctrl()

It's a convenient complement to OSSL_STORE_ctrl()

Suggested by Norm Green
Reviewed-by: NMatthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/5363)

crypto/store/store_lib.c

@@ -109,16 +109,22 @@ OSSL_STORE_CTX *OSSL_STORE_open(const char *uri, const UI_METHOD *ui_method,
 int OSSL_STORE_ctrl(OSSL_STORE_CTX *ctx, int cmd, ...)
 {
     va_list args;
-    int ret = 0;
+    int ret;
 
     va_start(args, cmd);
-    if (ctx->loader->ctrl != NULL)
-        ret = ctx->loader->ctrl(ctx->loader_ctx, cmd, args);
+    ret = OSSL_STORE_vctrl(ctx, cmd, args);
     va_end(args);
 
     return ret;
 }
 
+int OSSL_STORE_vctrl(OSSL_STORE_CTX *ctx, int cmd, va_list args)
+{
+    if (ctx->loader->ctrl != NULL)
+        return ctx->loader->ctrl(ctx->loader_ctx, cmd, args);
+    return 0;
+}
+
 OSSL_STORE_INFO *OSSL_STORE_load(OSSL_STORE_CTX *ctx)
 {
     OSSL_STORE_INFO *v = NULL;

include/openssl/store.h

@@ -58,6 +58,7 @@ OSSL_STORE_CTX *OSSL_STORE_open(const char *uri, const UI_METHOD *ui_method,
  * Each command takes different arguments.
  */
 int OSSL_STORE_ctrl(OSSL_STORE_CTX *ctx, int cmd, ... /* args */);
+int OSSL_STORE_vctrl(OSSL_STORE_CTX *ctx, int cmd, va_list args);
 
 /*
  * Common ctrl commands that different loaders may choose to support.

util/libcrypto.num

@@ -4505,3 +4505,4 @@ RAND_DRBG_lock                          4446	1_1_1	EXIST::FUNCTION:
 RAND_DRBG_unlock                        4447	1_1_1	EXIST::FUNCTION:
 RAND_DRBG_enable_locking                4448	1_1_1	EXIST::FUNCTION:
 RAND_DRBG_secure_new                    4449	1_1_1	EXIST::FUNCTION:
+OSSL_STORE_vctrl                        4450	1_1_1	EXIST::FUNCTION: