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string.c: share UTF-8 length table with mruby-string-ext.

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This commit is contained in:
Yukihiro "Matz" Matsumoto
2022-05-25 11:25:43 +09:00
parent be0b5f8cee
commit 7cdef2b03e
2 changed files with 8 additions and 11 deletions
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src/string.c
+6 -5
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@@ -239,16 +239,17 @@ mrb_gc_free_str(mrb_state *mrb, struct RString *str)
#ifdef MRB_UTF8_STRING
const char mrb_utf8len_table[] = {
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 3, 3, 4, 0
};
#define utf8_islead(c) ((unsigned char)((c)&0xc0) != 0x80)
mrb_int
mrb_utf8len(const char* p, const char* e)
{
static const char lengths[] = {
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 3, 3, 4, 0
};
mrb_int len = lengths[(unsigned char)p[0] >> 3];
mrb_int len = mrb_utf8len_table[(unsigned char)p[0] >> 3];
if (len > e - p) return 1;
switch (len) {
case 1: