net.openssl: add manual .str() methods for C.SSL and C.SSL_CTX, fix a bug in the V auto str generation as well.

vlib/net/openssl/c.v

@@ -42,6 +42,18 @@ pub struct C.SSL {
 pub struct C.SSL_CTX {
 }
 
+// The above C structs, have incomplete declarations in the OpenSSL headers.
+// For this reason, we have to prevent the automatic str() generation for them,
+// by adding manual implementations of their .str() methods, that are defined on
+// pointers to them:
+fn (s &C.SSL) str() string {
+	return 'C.SSL(0x${voidptr(s)})'
+}
+
+fn (c &C.SSL_CTX) str() string {
+	return 'C.SSL_CTX(0x${voidptr(c)})'
+}
+
 fn C.BIO_new_ssl_connect(ctx &C.SSL_CTX) &C.BIO
 
 fn C.BIO_set_conn_hostname(b &C.BIO, name &char) int

vlib/net/openssl/openssl_compiles_test.v

@@ -1,5 +1,16 @@
 import net.openssl
 
+struct Abc {
+	x &C.SSL_CTX
+}
+
+fn test_printing_struct_with_reference_field_of_type_ssl_ctx() {
+	a := Abc{&C.SSL_CTX(123)}
+	dump(a)
+	sa := a.str()
+	assert sa.contains('&C.SSL_CTX(0x7b)')
+}
+
 fn test_openssl_compiles() {
 	assert openssl.is_used == 1
 	assert true

vlib/v/gen/c/auto_str_methods.v

@@ -912,7 +912,6 @@ fn (mut g Gen) gen_str_for_struct(info ast.Struct, styp string, typ_str string,
 		} else {
 			g.get_str_fn(ftyp_noshared)
 		}
-
 		// with floats we use always the g representation:
 		if sym.kind !in [.f32, .f64] {
 			fn_body.write_string('{_SLIT("${quote_str}"), ${int(base_fmt)}, {.${data_str(base_fmt)}=')

vlib/v/gen/c/fn.v

@@ -435,6 +435,9 @@ fn (mut g Gen) c_fn_name(node &ast.FnDecl) !string {
 			return error('none')
 		}
 		name = g.cc_type(node.receiver.typ, false) + '_' + name
+		if unwrapped_rec_sym.language == .c {
+			name = name.replace_once('C__', '')
+		}
 	}
 	if node.language == .c {
 		name = util.no_dots(name)