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selftests/nolibc: add test for snprintf() truncation

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Now that we have a proper snprintf() implementation,
make sure truncation is handled properly.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Thomas Weißschuh
2025-04-22 10:59:06 +02:00
committed by Thomas Weißschuh
parent 6311e4893a
commit b0bd7760df
1 changed files with 3 additions and 1 deletions
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tools/testing/selftests/nolibc/nolibc-test.c
+3 -1
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@@ -1306,7 +1306,8 @@ static int expect_vfprintf(int llen, int c, const char *expected, const char *fm
va_start(args, fmt);
w = vsnprintf(buf, sizeof(buf), fmt, args);
/* Only allow writing 21 bytes, to test truncation */
w = vsnprintf(buf, 21, fmt, args);
va_end(args);
if (w != c) {
@@ -1412,6 +1413,7 @@ static int run_printf(int min, int max)
CASE_TEST(pointer); EXPECT_VFPRINTF(3, "0x1", "%p", (void *) 0x1); break;
CASE_TEST(uintmax_t); EXPECT_VFPRINTF(20, "18446744073709551615", "%ju", 0xffffffffffffffffULL); break;
CASE_TEST(intmax_t); EXPECT_VFPRINTF(20, "-9223372036854775807", "%jd", 0x8000000000000001LL); break;
CASE_TEST(truncation); EXPECT_VFPRINTF(25, "01234567890123456789", "%s", "0123456789012345678901234"); break;
CASE_TEST(scanf); EXPECT_ZR(1, test_scanf()); break;
case __LINE__:
return ret; /* must be last */