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Fixed bacnet_snprintf() to be able to return the full length of a string when the size is zero. (#1164)

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This commit is contained in:
Steve Karg
2025-12-01 13:45:30 -06:00
committed by GitHub
parent f28c804969
commit 73fbb400cb
4 changed files with 58 additions and 13 deletions
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test/bacnet/bacstr/src/main.c
+22 -1
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@@ -790,10 +790,27 @@ ZTEST(bacstr_tests, test_bacnet_snprintf)
static void test_bacnet_snprintf(void)
#endif
{
int buf_len = 0, str_len;
int buf_len = 0, str_len, null_len = 0, test_null_len = 0;
int i;
char str[30] = "";
const char *null_string = "REALLY BIG NULL STRING";
const char *one_char_string = "1";
const char *two_char_string = "12";
/* one char */
buf_len = 0;
str_len = 1;
buf_len = bacnet_snprintf(str, str_len, buf_len, "%s", one_char_string);
zassert_equal(buf_len, str_len, "buf_len=%d str_len=%d", buf_len, str_len);
/* two char */
buf_len = 0;
str_len = 2;
buf_len = bacnet_snprintf(str, str_len, buf_len, "%s", two_char_string);
zassert_equal(buf_len, str_len, "buf_len=%d str_len=%d", buf_len, str_len);
buf_len = bacnet_snprintf(str, str_len, buf_len, "%s", two_char_string);
zassert_equal(buf_len, str_len, "buf_len=%d str_len=%d", buf_len, str_len);
/* large chars */
buf_len = 0;
str_len = sizeof(str);
for (i = 0; i < 5; i++) {
/* appending formatted strings */
@@ -801,10 +818,14 @@ static void test_bacnet_snprintf(void)
buf_len =
bacnet_snprintf(str, str_len, buf_len, "REALLY BIG STRING BASS");
buf_len = bacnet_snprintf(str, str_len, buf_len, "}");
/* appending to a NULL string for length */
null_len = bacnet_snprintf(NULL, 0, null_len, null_string);
test_null_len += strlen(null_string);
}
zassert_equal(buf_len, str_len, "buf_len=%d str_len=%d", buf_len, str_len);
zassert_equal(
str[buf_len - 1], 0, "str[%d]=%c", buf_len - 1, str[buf_len - 1]);
zassert_equal(null_len, test_null_len, "null_len=%d", null_len);
}
/**