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tests: Add "z" length modifier printf tests

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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>
This commit is contained in:
Michael Chang 2025-10-17 17:01:33 +08:00 committed by Daniel Kiper
parent 3c9762b12f
commit 512e33ec7c
1 changed files with 10 additions and 0 deletions
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10
tests/printf_unit_test.c
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@ -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);