| * Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved. |
| * SPDX-License-Identifier: BSD-3-Clause |
| void *memmove(void *dst, const void *src, size_t len) |
| * The following test makes use of unsigned arithmetic overflow to |
| * more efficiently test the condition !(src <= dst && dst < str+len). |
| * It also avoids the situation where the more explicit test would give |
| * incorrect results were the calculation str+len to overflow (though |
| * that issue is probably moot as such usage is probably undefined |
| * behaviour and a bug anyway. |
| if ((size_t)dst - (size_t)src >= len) { |
| /* destination not in source data, so can safely use memcpy */ |
| return memcpy(dst, src, len); |
| const char *s = (const char *)src + len; |
| char *d = (char *)dst + len; |