DUK_EXTERNAL void *duk_steal_buffer(duk_context *ctx, duk_idx_t index, duk_size_t *out_size) {
duk_hthread *thr = (duk_hthread *) ctx;
duk_hbuffer_dynamic *h;
void *ptr;
duk_size_t sz;
DUK_ASSERT(ctx != NULL);
h = (duk_hbuffer_dynamic *) duk_require_hbuffer(ctx, index);
DUK_ASSERT(h != NULL);
if (!DUK_HBUFFER_HAS_DYNAMIC(h)) {
DUK_ERROR(thr, DUK_ERR_TYPE_ERROR, DUK_STR_BUFFER_NOT_DYNAMIC);
}
/* Forget the previous allocation, setting size to 0 and alloc to
* NULL. Caller is responsible for freeing the previous allocation.
* Getting the allocation and clearing it is done in the same API
* call to avoid any chance of a realloc.
*/
ptr = DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(thr->heap, h);
sz = DUK_HBUFFER_DYNAMIC_GET_SIZE(h);
if (out_size) {
*out_size = sz;
}
DUK_HBUFFER_DYNAMIC_SET_DATA_PTR_NULL(thr->heap, h);
DUK_HBUFFER_DYNAMIC_SET_SIZE(h, 0);
DUK_HBUFFER_DYNAMIC_SET_ALLOC_SIZE(h, 0);
return ptr;
}
DUK_LOCAL void duk__print_hbuffer(duk__dprint_state *st, duk_hbuffer *h) {
duk_fixedbuffer *fb = st->fb;
duk_size_t i, n;
duk_uint8_t *p;
if (duk_fb_is_full(fb)) {
return;
}
/* terminal type: no depth check */
if (!h) {
duk_fb_put_cstring(fb, "NULL");
return;
}
if (DUK_HBUFFER_HAS_DYNAMIC(h)) {
if (DUK_HBUFFER_HAS_EXTERNAL(h)) {
duk_hbuffer_external *g = (duk_hbuffer_external *) h;
duk_fb_sprintf(fb, "buffer:external:%p:%ld",
(void *) DUK_HBUFFER_EXTERNAL_GET_DATA_PTR(NULL, g),
(long) DUK_HBUFFER_EXTERNAL_GET_SIZE(g));
} else {
duk_hbuffer_dynamic *g = (duk_hbuffer_dynamic *) h;
duk_fb_sprintf(fb, "buffer:dynamic:%p:%ld",
(void *) DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(NULL, g),
(long) DUK_HBUFFER_DYNAMIC_GET_SIZE(g));
}
} else {
duk_fb_sprintf(fb, "buffer:fixed:%ld", (long) DUK_HBUFFER_GET_SIZE(h));
}
#if defined(DUK_USE_REFERENCE_COUNTING)
duk_fb_sprintf(fb, "/%lu", (unsigned long) DUK_HEAPHDR_GET_REFCOUNT(&h->hdr));
#endif
if (st->hexdump) {
duk_fb_sprintf(fb, "=[");
n = DUK_HBUFFER_GET_SIZE(h);
p = (duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(NULL, h);
for (i = 0; i < n; i++) {
duk_fb_sprintf(fb, "%02lx", (unsigned long) p[i]);
}
duk_fb_sprintf(fb, "]");
}
}
