duk_hstring_misc.c File Reference

#include "duk_internal.h"

Go to the source code of this file.

Functions
DUK_INTERNAL duk_ucodepoint_t	duk_hstring_char_code_at_raw (duk_hthread *thr, duk_hstring *h, duk_uint_t pos)

Function Documentation

duk_hstring_char_code_at_raw()

DUK_INTERNAL duk_ucodepoint_t duk_hstring_char_code_at_raw	(	duk_hthread *	thr,
		duk_hstring *	h,
		duk_uint_t	pos )

Definition at line 7 of file duktape-1.8.0/src-separate/duk_hstring_misc.c.

                                                                                                             {
    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;
}

References DUK_ASSERT, DUK_ASSERT_DISABLE, DUK_DDD, DUK_DDDPRINT, duk_heap_strcache_offset_char2byte(), DUK_HSTRING_GET_BYTELEN, DUK_HSTRING_GET_CHARLEN, DUK_HSTRING_GET_DATA, duk_unicode_decode_xutf8_checked(), and NULL.