/* This function is equivalent to strcasestr() for multibyte strings,
* except in that it scans the string in reverse, starting at rev_start. */
char *mbrevstrcasestr(const char *haystack, const char *needle, const
char *rev_start)
{
#ifdef ENABLE_UTF8
if (use_utf8) {
size_t rev_start_len, needle_len;
if (*needle == '\0')
return (char *)rev_start;
needle_len = mbstrlen(needle);
if (mbstrlen(haystack) < needle_len)
return NULL;
rev_start_len = mbstrlen(rev_start);
while (TRUE) {
if (rev_start_len >= needle_len &&
mbstrncasecmp(rev_start, needle, needle_len) == 0)
return (char *)rev_start;
/* If we've reached the head of the haystack, we found nothing. */
if (rev_start == haystack)
return NULL;
rev_start = haystack + move_mbleft(haystack, rev_start - haystack);
rev_start_len++;
}
} else
#endif
return revstrcasestr(haystack, needle, rev_start);
}
/* This function is equivalent to strcasestr() for multibyte strings,
* except in that it scans the string in reverse, starting at
* rev_start. */
char *mbrevstrcasestr(const char *haystack, const char *needle, const
char *rev_start)
{
#ifdef ENABLE_UTF8
if (use_utf8) {
bool begin_line = FALSE;
size_t rev_start_len, needle_len;
assert(haystack != NULL && needle != NULL && rev_start != NULL);
if (*needle == '\0')
return (char *)rev_start;
needle_len = mbstrlen(needle);
if (mbstrlen(haystack) < needle_len)
return NULL;
rev_start_len = mbstrlen(rev_start);
while (!begin_line) {
if (rev_start_len >= needle_len &&
mbstrncasecmp(rev_start, needle, needle_len) == 0 &&
mblen(rev_start, MB_CUR_MAX) > 0)
return (char *)rev_start;
if (rev_start == haystack)
begin_line = TRUE;
else {
rev_start = haystack + move_mbleft(haystack, rev_start -
haystack);
rev_start_len++;
}
}
return NULL;
} else
#endif
return revstrcasestr(haystack, needle, rev_start);
}
