We have to ensure while printing UTF16 strings that we do not exceed the
end of the print buffer.
Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
---
v2
Use the exact UTF8 length of the converted UTF16 character when
checking if sufficient space is remaining in the buffer. This
avoids missing up to 2 characters.
---
lib/vsprintf.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 4213441fbf..de5db1aa5c 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -279,13 +279,17 @@ static char *string(char *buf, char *end, char *s, int
field_width,
static char *string16(char *buf, char *end, u16 *s, int field_width,
int precision, int flags)
{
- u16 *str = s ? s : L"<NULL>";
- ssize_t len = utf16_strnlen(str, precision);
+ const u16 *str = s ? s : L"<NULL>";
+ ssize_t i, len = utf16_strnlen(str, precision);
if (!(flags & LEFT))
for (; len < field_width; --field_width)
ADDCH(buf, ' ');
- utf16_utf8_strncpy(&buf, str, len);
+ for (i = 0; i < len && buf + utf16_utf8_strnlen(str, 1) <= end; ++i) {
+ s32 s = utf16_get(&str);
+
+ utf8_put(s, &buf);
+ }
for (; len < field_width; --field_width)
ADDCH(buf, ' ');
return buf;
--
2.20.1
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