TAPify testutil

With the perl test framework comes the output format TAP
(Test Anything Protocol, see http://testanything.org/) with
extra extension for subtests.  This change extends that same
output format to any test program using testutil.

In this implementation, each test program is seen as a full test that
can be used as a subtest.  The perl framework passes on the subtest
level to the test programs with the environment variable
HARNESS_OSSL_LEVEL.  Furthermore, and series of tests added with
ADD_ALL_TESTS is regarded as another subtest level.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3296)

1 files changed, 2 insertions, 0 deletions

diff --git a/test/testutil/tests.c b/test/testutil/tests.c
index f00ec6c..67b20a5 100644
--- a/test/testutil/tests.c
+++ b/test/testutil/tests.c
@@ -43,6 +43,7 @@
 static void test_fail_message(const char *prefix, const char *file, int line,
                               const char *type, const char *fmt, ...)
             PRINTF_FORMAT(5, 6);
+int subtest_level(void);
 
 static void helper_printf_stderr(const char *fmt, ...)
 {
@@ -56,6 +57,7 @@ static void helper_printf_stderr(const char *fmt, ...)
 static void test_fail_message_va(const char *prefix, const char *file, int line,
                                  const char *type, const char *fmt, va_list ap)
 {
+    helper_printf_stderr("%*s# ", subtest_level(), "");
     test_puts_stderr(prefix != NULL ? prefix : "ERROR");
     test_puts_stderr(":");
     if (type)