/* * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> * Copyright (C) 2004 Microtronix Datacom Ltd * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #include <linux/types.h> #include <linux/string.h> void *memmove(void *d, const void *s, size_t count) { unsigned long dst, src; if (!count) return d; if (d < s) { dst = (unsigned long) d; src = (unsigned long) s; if ((count < 8) || ((dst ^ src) & 3)) goto restup; if (dst & 1) { *(char *)dst++ = *(char *)src++; count--; } if (dst & 2) { *(short *)dst = *(short *)src; src += 2; dst += 2; count -= 2; } while (count > 3) { *(long *)dst = *(long *)src; src += 4; dst += 4; count -= 4; } restup: while (count--) *(char *)dst++ = *(char *)src++; } else { dst = (unsigned long) d + count; src = (unsigned long) s + count; if ((count < 8) || ((dst ^ src) & 3)) goto restdown; if (dst & 1) { src--; dst--; count--; *(char *)dst = *(char *)src; } if (dst & 2) { src -= 2; dst -= 2; count -= 2; *(short *)dst = *(short *)src; } while (count > 3) { src -= 4; dst -= 4; count -= 4; *(long *)dst = *(long *)src; } restdown: while (count--) { src--; dst--; *(char *)dst = *(char *)src; } } return d; }