pkarashchenko commented on code in PR #6666:
URL: https://github.com/apache/incubator-nuttx/pull/6666#discussion_r928753431
##########
libs/libc/wchar/lib_wcrtomb.c:
##########
@@ -57,18 +51,37 @@
size_t wcrtomb(FAR char *s, wchar_t wc, FAR mbstate_t *ps)
{
- int retval = 0;
- char buf[MB_LEN_MAX];
-
if (s == NULL)
{
- retval = wctomb(buf, wc);
+ return 0;
+ }
+ else if ((unsigned)wc < 0x80)
+ {
+ *s = wc;
+ return 1;
+ }
+ else if ((unsigned)wc < 0x800)
+ {
+ *s++ = 0xc0 | (wc >> 6);
+ *s = 0x80 | (wc & 0x3f);
+ return 2;
+ }
+ else if ((unsigned)wc < 0xd800 || (unsigned)wc - 0xe000 < 0x2000)
+ {
+ *s++ = 0xe0 | (wc >> 12);
+ *s++ = 0x80 | ((wc >> 6) & 0x3f);
+ *s = 0x80 | (wc & 0x3f);
+ return 3;
}
- else
+ else if ((unsigned)wc - 0x10000 < 0x100000)
Review Comment:
So here we assume that `int` is at lease 32bit? Maybe switching to fixed
sized `uint32_t` or at least to `unsigned long` is better? Also logic can be
reworked to avoid subtraction of unsigned: `else if ((unsigned)wc < 0x110000)`
##########
libs/libc/wchar/lib_wcsnrtombs.c:
##########
@@ -72,50 +67,57 @@
size_t wcsnrtombs(FAR char *dst, FAR const wchar_t **src, size_t nwc,
size_t len, FAR mbstate_t *ps)
{
- size_t i;
+ FAR const wchar_t *ws = *src;
+ size_t cnt = 0;
if (dst == NULL)
{
- for (i = 0; i < nwc; i++)
+ len = 0;
+ }
+
+ while (ws != NULL && nwc != 0)
+ {
+ char tmp[MB_LEN_MAX];
+ size_t l;
+
+ if (*ws == 0)
{
- wchar_t wc = (*src)[i];
+ ws = NULL;
+ break;
+ }
- if (wc < 0 || wc > 0xff)
- {
- set_errno(EILSEQ);
- return -1;
- }
+ l = wcrtomb(len < MB_LEN_MAX ? tmp : dst, *ws, ps);
+ if ((ssize_t)l < 0)
Review Comment:
Posting a comment here just to ensure that `0` is handled properly. It is
hard to track `l == 0` path
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