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memmove.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1985-2005 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped

#include <ast.h>

#if _lib_memmove

NoN(memmove)

#else

void*
memmove(void* to, const void* from, register size_t n)
{
      register char*    out = (char*)to;
      register char*    in = (char*)from;

      if (n <= 0) /* works if size_t is signed or not */
            ;
      else if (in + n <= out || out + n <= in)
            return(memcpy(to, from, n));  /* hope it's fast*/
      else if (out < in)
            do *out++ = *in++; while (--n > 0);
      else
      {
            out += n;
            in += n;
            do *--out = *--in; while(--n > 0);
      }
      return(to);
}

#endif

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