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lib/charset: fix u16_strlcat() return value

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strlcat returns min(strlen(dest), count)+strlen(src). Make u16_strlcat's
behaviour the same for consistency.

Fixes: eca08ce94c ("lib/charset: add u16_strlcat() function")
Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
This commit is contained in:
Matthias Schiffer 2023-07-14 13:24:51 +02:00 • committed by Tom Rini
parent 615828721a
commit 7c00b80d48
2 changed files with 8 additions and 8 deletions
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8
lib/charset.c
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@ -444,14 +444,14 @@ u16 *u16_strdup(const void *src)
size_t u16_strlcat(u16 *dest, const u16 *src, size_t count)
{
size_t destlen = u16_strlen(dest);
size_t destlen = u16_strnlen(dest, count);
size_t srclen = u16_strlen(src);
size_t ret = destlen + srclen + 1;
size_t ret = destlen + srclen;
if (destlen >= count)
return ret;
if (ret > count)
srclen -= ret - count;
if (ret >= count)
srclen -= (ret - count + 1);
memcpy(&dest[destlen], src, 2 * srclen);
dest[destlen + srclen] = 0x0000;

8
test/unicode_ut.c
View file

@ -808,12 +808,12 @@ static int unicode_test_u16_strlcat(struct unit_test_state *uts)
/* dest and src are empty string */
memset(buf, 0, sizeof(buf));
ret = u16_strlcat(buf, &null_src, sizeof(buf));
ut_asserteq(1, ret);
ut_asserteq(0, ret);
/* dest is empty string */
memset(buf, 0, sizeof(buf));
ret = u16_strlcat(buf, src, sizeof(buf));
ut_asserteq(5, ret);
ut_asserteq(4, ret);
ut_assert(!unicode_test_u16_strcmp(buf, src, 40));
/* src is empty string */
@ -821,14 +821,14 @@ static int unicode_test_u16_strlcat(struct unit_test_state *uts)
buf[39] = 0;
memcpy(buf, dest, sizeof(dest));
ret = u16_strlcat(buf, &null_src, sizeof(buf));
ut_asserteq(6, ret);
ut_asserteq(5, ret);
ut_assert(!unicode_test_u16_strcmp(buf, dest, 40));
for (i = 0; i <= 40; i++) {
memset(buf, 0xCD, (sizeof(buf) - sizeof(u16)));
buf[39] = 0;
memcpy(buf, dest, sizeof(dest));
expected = 10;
expected = min(5, i) + 4;
ret = u16_strlcat(buf, src, i);
ut_asserteq(expected, ret);
if (i <= 6) {