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, "]"); } }