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string.c (char_adjust): simplify and unroll function.

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This commit is contained in:
Yukihiro "Matz" Matsumoto
2022-05-23 12:19:30 +09:00
parent 4769ace7e1
commit 9475521fa3
1 changed files with 6 additions and 20 deletions
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src/string.c
+6 -20
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@@ -340,28 +340,14 @@ bytes2chars(char *p, mrb_int len, mrb_int bi)
return i;
}
static const char *
static const char*
char_adjust(const char *beg, const char *end, const char *ptr)
{
if ((ptr > beg || ptr < end) && (*ptr & 0xc0) == 0x80) {
const int utf8_adjust_max = 3;
const char *p;
if (ptr - beg > utf8_adjust_max) {
beg = ptr - utf8_adjust_max;
}
p = ptr;
while (p > beg) {
p --;
if ((*p & 0xc0) != 0x80) {
int clen = mrb_utf8len(p, end);
if (clen > ptr - p) return p;
break;
}
}
}
ptrdiff_t len = end - ptr;
if (len < 1 || utf8_islead(ptr[0])) return ptr;
if (len > 1 && utf8_islead(ptr[1])) return ptr+1;
if (len > 2 && utf8_islead(ptr[2])) return ptr+2;
if (len > 3 && utf8_islead(ptr[3])) return ptr+3;
return ptr;
}