int64_t ObStringSearch::fast_search(const ObString & pattern, const ObString & text)
{
const char* pat = pattern.ptr();
const int64_t pat_len = pattern.length();
const char* txt = text.ptr();
const int64_t txt_len = text.length();
return fast_search(pat, pat_len, txt, txt_len);
}
static inline ssize_t
sub_str_find(const char *str,
ssize_t str_len,
const char *sub,
ssize_t sub_len,
ssize_t offset)
{
ssize_t pos;
if (sub_len == 0)
return offset;
pos = fast_search(str, str_len, sub, sub_len, -1, FAST_SEARCH);
if (pos >= 0)
pos += offset;
return pos;
}
static inline ssize_t
sub_str_count(const char *str,
size_t str_len,
const char *sub,
size_t sub_len,
size_t max_count)
{
ssize_t count;
if (sub_len == 0)
return (str_len < max_count) ? str_len + 1 : max_count;
count = fast_search(str, str_len, sub, sub_len, max_count, FAST_COUNT);
if (count < 0)
return 0; /* no match */
return count;
}
