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test: test truncation in snprintf()

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Test that the return value of snprintf() is correct in the case of
truncation.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Heinrich Schuchardt 2021-11-15 19:06:55 +01:00
parent ac7606af7d
commit 0c9e8bf2bb
1 changed files with 18 additions and 0 deletions
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18
test/print_ut.c
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@ -31,6 +31,7 @@ static int print_guid(struct unit_test_state *uts)
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16
};
char str[40];
int ret;
sprintf(str, "%pUb", guid);
ut_assertok(strcmp("01020304-0506-0708-090a-0b0c0d0e0f10", str));
@ -40,6 +41,9 @@ static int print_guid(struct unit_test_state *uts)
ut_assertok(strcmp("04030201-0605-0807-090a-0b0c0d0e0f10", str));
sprintf(str, "%pUL", guid);
ut_assertok(strcmp("04030201-0605-0807-090A-0B0C0D0E0F10", str));
ret = snprintf(str, 4, "%pUL", guid);
ut_asserteq(0, str[3]);
ut_asserteq(36, ret);
return 0;
}
@ -349,6 +353,20 @@ static int print_itoa(struct unit_test_state *uts)
}
PRINT_TEST(print_itoa, 0);
static int snprint(struct unit_test_state *uts)
{
char buf[10] = "xxxxxxxxx";
int ret;
ret = snprintf(buf, 4, "%s:%s", "abc", "def");
ut_asserteq(0, buf[3]);
ut_asserteq(7, ret);
ret = snprintf(buf, 4, "%s:%d", "abc", 9999);
ut_asserteq(8, ret);
return 0;
}
PRINT_TEST(snprint, 0);
static int print_xtoa(struct unit_test_state *uts)
{
ut_asserteq_str("7f", simple_xtoa(127));