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string.c (chars2bytes): use early return

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This commit is contained in:
Yukihiro "Matz" Matsumoto
2024-01-10 12:41:28 +09:00
parent e39e4ea26d
commit df0a5e838d
1 changed files with 12 additions and 10 deletions
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src/string.c
+12 -10
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@@ -329,17 +329,19 @@ chars2bytes(mrb_value s, mrb_int off, mrb_int idx)
if (RSTR_ASCII_P(mrb_str_ptr(s))) {
return idx;
}
else {
const char *p0 = RSTRING_PTR(s) + off;
const char *p = p0;
const char *e = RSTRING_END(s);
while (p < e && idx--) {
p += mrb_utf8len(p, e);
}
mrb_int len = (mrb_int)(p-p0);
if (idx > 0 || p > e) len++;
return len;
const char *p0 = RSTRING_PTR(s) + off;
const char *p = p0;
const char *e = RSTRING_END(s);
while (p < e && idx--) {
if ((*p & 0x80) == 0) p++;
else p += mrb_utf8len(p, e);
}
mrb_int len = (mrb_int)(p-p0);
if (idx > 0 || p > e) len++;
return len;
}
/* map byte offset to character index */