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regexp: Refactor cstrchr

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Ref #1476
This commit is contained in:
ZyX 2017-04-06 21:56:49 +03:00
parent 171baaee93
commit ac1cb1c72f
1 changed files with 27 additions and 32 deletions
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59
src/nvim/regexp.c
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@ -6287,43 +6287,38 @@ static int cstrncmp(char_u *s1, char_u *s2, int *n)
/*
* cstrchr: This function is used a lot for simple searches, keep it fast!
*/
static char_u *cstrchr(char_u *s, int c)
static inline char_u *cstrchr(const char_u *const s, const int c)
FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_ALL
FUNC_ATTR_ALWAYS_INLINE
{
char_u *p;
int cc;
if (!ireg_ic
|| (!enc_utf8 && mb_char2len(c) > 1)
)
if (!ireg_ic) {
return vim_strchr(s, c);
}
/* tolower() and toupper() can be slow, comparing twice should be a lot
* faster (esp. when using MS Visual C++!).
* For UTF-8 need to use folded case. */
if (enc_utf8 && c > 0x80)
cc = utf_fold(c);
else if (vim_isupper(c))
cc = vim_tolower(c);
else if (vim_islower(c))
cc = vim_toupper(c);
else
return vim_strchr(s, c);
if (has_mbyte) {
for (p = s; *p != NUL; p += (*mb_ptr2len)(p)) {
if (enc_utf8 && c > 0x80) {
if (utf_fold(utf_ptr2char(p)) == cc)
return p;
} else if (*p == c || *p == cc)
return p;
// tolower() and toupper() can be slow, comparing twice should be a lot
// faster (esp. when using MS Visual C++!).
// For UTF-8 need to use folded case.
if (c > 0x80) {
const int folded_c = utf_fold(c);
for (const char_u *p = s; *p != NUL; p += utfc_ptr2len(p)) {
if (utf_fold(utf_ptr2char(p)) == folded_c) {
return (char_u *)p;
}
}
} else
/* Faster version for when there are no multi-byte characters. */
for (p = s; *p != NUL; ++p)
if (*p == c || *p == cc)
return p;
return NULL;
}
return NULL;
int cc;
if (vim_isupper(c)) {
cc = vim_tolower(c);
} else if (vim_islower(c)) {
cc = vim_toupper(c);
} else {
return vim_strchr(s, c);
}
char tofind[] = { (char)c, (char)cc, NUL };
return (char_u *)strpbrk((const char *)s, tofind);
}
/***************************************************************