From: Michael Chang <mchang@suse.com>
Date: Fri, 17 Oct 2025 09:01:33 +0000 (+0800)
Subject: tests: Add "z" length modifier printf tests
X-Git-Tag: grub-2.14-rc1~32
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=512e33ec7c1ede5859251b3ec91ece8d8714f663;p=thirdparty%2Fgrub.git

tests: Add "z" length modifier printf tests

Add unit tests for %zd, %zu and %zx to verify size_t and ssize_t
formatting matches system snprintf().

Signed-off-by: Michael Chang <mchang@suse.com>
Reviewed-by: Neal Gompa <ngompa13@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---

diff --git a/tests/printf_unit_test.c b/tests/printf_unit_test.c
index 098c29fd9..f2de187b0 100644
--- a/tests/printf_unit_test.c
+++ b/tests/printf_unit_test.c
@@ -20,6 +20,7 @@
 #include <string.h>
 #include <grub/test.h>
 #include <grub/misc.h>
+#include <stdint.h>
 
 #define MSG "printf test failed: %s, %s", real, expected
 
@@ -73,6 +74,15 @@ printf_test (void)
   grub_snprintf (real, sizeof (real), "%%0%dd ", 1);
   snprintf (expected, sizeof (expected), "%%0%dd ", 1);
   grub_test_assert (strcmp (real, expected) == 0, MSG);
+  grub_snprintf (real, sizeof (real), "%zd %zd %zd", (ssize_t) -1, (ssize_t) (SIZE_MAX >> 1), (ssize_t) 42);
+  snprintf (expected, sizeof (expected), "%zd %zd %zd", (ssize_t) -1, (ssize_t) (SIZE_MAX >> 1), (ssize_t) 42);
+  grub_test_assert (strcmp (real, expected) == 0, MSG);
+  grub_snprintf (real, sizeof (real), "%zu %zu %zu", (size_t) 0, (size_t) SIZE_MAX, (size_t) 42);
+  snprintf (expected, sizeof (expected), "%zu %zu %zu", (size_t) 0, (size_t) SIZE_MAX, (size_t) 42);
+  grub_test_assert (strcmp (real, expected) == 0, MSG);
+  grub_snprintf (real, sizeof (real), "%zx %zx %zx", (ssize_t) (SIZE_MAX >> 1), (size_t) SIZE_MAX, (size_t) 0xdeadbeefU);
+  snprintf (expected, sizeof (expected), "%zx %zx %zx", (ssize_t) (SIZE_MAX >> 1), (size_t) SIZE_MAX, (size_t) 0xdeadbeefU);
+  grub_test_assert (strcmp (real, expected) == 0, MSG);
 }
 
 GRUB_UNIT_TEST ("printf_unit_test", printf_test);