| /* |
| * librd - Rapid Development C library |
| * |
| * Copyright (c) 2012, Magnus Edenhill |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "rd.h" |
| #include "rdrand.h" |
| |
| |
| |
| void rd_array_shuffle (void *base, size_t nmemb, size_t entry_size) { |
| int i; |
| void *tmp = rd_alloca(entry_size); |
| |
| /* FIXME: Optimized version for word-sized entries. */ |
| |
| for (i = (int) nmemb - 1 ; i > 0 ; i--) { |
| int j = rd_jitter(0, i); |
| if (unlikely(i == j)) |
| continue; |
| |
| memcpy(tmp, (char *)base + (i*entry_size), entry_size); |
| memcpy((char *)base+(i*entry_size), |
| (char *)base+(j*entry_size), entry_size); |
| memcpy((char *)base+(j*entry_size), tmp, entry_size); |
| } |
| } |