Suppress printf format warnings

* Add `printf` format attribute to `ossl_raise`.
* Fix a format specifier in `config_load_bio`.
* Use `ASSUME` for the unreachable condition.

Author: nobu

ext/openssl/ossl.c

@@ -265,6 +265,8 @@ ossl_to_der_if_possible(VALUE obj)
     return obj;
 }
 
+PRINTF_ARGS(static VALUE ossl_make_error(VALUE exc, const char *fmt, va_list args), 2, 0);
+
 /*
  * Errors
  */

ext/openssl/ossl.h

@@ -120,7 +120,7 @@ int ossl_pem_passwd_cb(char *, int, int, void *);
 /*
  * ERRor messages
  */
-NORETURN(void ossl_raise(VALUE, const char *, ...));
+PRINTF_ARGS(NORETURN(void ossl_raise(VALUE, const char *, ...)), 2, 3);
 /* Clear OpenSSL error queue. If dOSSL is set, rb_warn() them. */
 void ossl_clear_error(void);
 

ext/openssl/ossl_config.c

@@ -60,7 +60,7 @@ config_load_bio(CONF *conf, BIO *bio)
         if (eline <= 0)
             ossl_raise(eConfigError, "wrong config format");
         else
-            ossl_raise(eConfigError, "error in line %d", eline);
+            ossl_raise(eConfigError, "error in line %ld", eline);
     }
     BIO_free(bio);
 

ext/openssl/ossl_pkey_ec.c

@@ -596,8 +596,10 @@ static VALUE ossl_ec_group_initialize(int argc, VALUE *argv, VALUE self)
         ossl_raise(rb_eArgError, "wrong number of arguments");
     }
 
-    if (group == NULL)
-        ossl_raise(eEC_GROUP, "");
+#if !defined(LIKELY) && !defined(RB_LIKELY)
+#define LIKELY(x) (x)
+#endif
+    ASSUME(group);
     RTYPEDDATA_DATA(self) = group;
 
     return self;