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string.c (char_backtrack): simplify the code using utf8_islead().

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This commit is contained in:
Yukihiro "Matz" Matsumoto
2022-05-22 18:23:07 +09:00
parent 916fd642fa
commit 4769ace7e1
1 changed files with 6 additions and 20 deletions
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src/string.c
+6 -20
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@@ -365,28 +365,14 @@ char_adjust(const char *beg, const char *end, const char *ptr)
return ptr;
}
static const char *
static const char*
char_backtrack(const char *ptr, const char *end)
{
if (ptr < end) {
const int utf8_bytelen_max = 4;
const char *p;
if (end - ptr > utf8_bytelen_max) {
ptr = end - utf8_bytelen_max;
}
p = end;
while (p > ptr) {
p --;
if ((*p & 0xc0) != 0x80) {
int clen = utf8len_codepage[(unsigned char)*p];
if (clen == end - p) { return p; }
break;
}
}
}
ptrdiff_t len = end - ptr;
if (len < 1 || utf8_islead(end[-1])) return end-1;
if (len > 1 && utf8_islead(end[-2])) return end-2;
if (len > 2 && utf8_islead(end[-3])) return end-3;
if (len > 3 && utf8_islead(end[-4])) return end-4;
return end - 1;
}