| /* |
| * Misc support functions |
| */ |
| |
| #include "duk_internal.h" |
| |
| DUK_INTERNAL duk_ucodepoint_t duk_hstring_char_code_at_raw(duk_hthread *thr, duk_hstring *h, duk_uint_t pos) { |
| duk_uint32_t boff; |
| const duk_uint8_t *p, *p_start, *p_end; |
| duk_ucodepoint_t cp; |
| |
| /* Caller must check character offset to be inside the string. */ |
| DUK_ASSERT(thr != NULL); |
| DUK_ASSERT(h != NULL); |
| DUK_ASSERT_DISABLE(pos >= 0); /* unsigned */ |
| DUK_ASSERT(pos < (duk_uint_t) DUK_HSTRING_GET_CHARLEN(h)); |
| |
| boff = duk_heap_strcache_offset_char2byte(thr, h, (duk_uint32_t) pos); |
| DUK_DDD(DUK_DDDPRINT("charCodeAt: pos=%ld -> boff=%ld, str=%!O", |
| (long) pos, (long) boff, (duk_heaphdr *) h)); |
| DUK_ASSERT_DISABLE(boff >= 0); |
| DUK_ASSERT(boff < DUK_HSTRING_GET_BYTELEN(h)); |
| |
| p_start = DUK_HSTRING_GET_DATA(h); |
| p_end = p_start + DUK_HSTRING_GET_BYTELEN(h); |
| p = p_start + boff; |
| DUK_DDD(DUK_DDDPRINT("p_start=%p, p_end=%p, p=%p", |
| (const void *) p_start, (const void *) p_end, |
| (const void *) p)); |
| |
| /* This may throw an error though not for valid E5 strings. */ |
| cp = duk_unicode_decode_xutf8_checked(thr, &p, p_start, p_end); |
| return cp; |
| } |
| |
| #if !defined(DUK_USE_HSTRING_CLEN) |
| DUK_INTERNAL duk_size_t duk_hstring_get_charlen(duk_hstring *h) { |
| if (DUK_HSTRING_HAS_ASCII(h)) { |
| /* Most practical strings will go here. */ |
| return DUK_HSTRING_GET_BYTELEN(h); |
| } else { |
| return duk_unicode_unvalidated_utf8_length(DUK_HSTRING_GET_DATA(h), DUK_HSTRING_GET_BYTELEN(h)); |
| } |
| } |
| #endif /* !DUK_USE_HSTRING_CLEN */ |
