syscall.S revision 405b8029a6888f386adf3512113a33546141d1c8
1405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham/* 2405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * Copyright (C) 2008 The Android Open Source Project 3405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * All rights reserved. 4405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * 5405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * Redistribution and use in source and binary forms, with or without 6405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * modification, are permitted provided that the following conditions 7405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * are met: 8405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * * Redistributions of source code must retain the above copyright 9405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * notice, this list of conditions and the following disclaimer. 10405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * * Redistributions in binary form must reproduce the above copyright 11405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * notice, this list of conditions and the following disclaimer in 12405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * the documentation and/or other materials provided with the 13405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * distribution. 14405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * 15405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * SUCH DAMAGE. 27405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham */ 28405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham#include <string.h> 29405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham#include <strings.h> 30405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham 31405b8029a6888f386adf3512113a33546141d1c8Raghu Gandhamvoid *memmove(void *dst, const void *src, size_t n) 32405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham{ 33405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham const char *p = src; 34405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham char *q = dst; 35405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham /* We can use the optimized memcpy if the destination is completely below the 36405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham * source (i.e. q + n <= p), or if it is completely over it (i.e. q >= p+n). 37405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham */ 38405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham if (__builtin_expect((q + n < p) || (q >= p + n), 1)) { 39405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham return memcpy(dst, src, n); 40405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham } else { 41405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham bcopy(src, dst, n); 42405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham return dst; 43405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham } 44405b8029a6888f386adf3512113a33546141d1c8Raghu Gandham} 45