/* Implement string-related runtime actions for CHILL.
   Copyright (C) 1992,1993 Free Software Foundation, Inc.
   Author: Bill Cox

This file is part of GNU CC.

GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#define MIN(a, b)  ((a) < (b) ? (a) : (b))


/*
 * function memmove
 *
 * parameters:
 *     S1 - pointer to destination string
 *     S2 - pointer to source string
 *     LEN - length of string
 *
 * returns:
 *     pointer to destination string
 *
 * exceptions:
 *     none
 *
 * abstract:
 *     copies a string safely, where the source and dest areas may overlap.
 *
 */

void *
memmove (s1, s2, n)
     void *s1;
     const void *s2;
     int n;
{
  char *sc1 = s1;
  const char *sc2 = s2;

  if (sc2 < sc1 && (sc1 < sc2 + n))
    for (sc1 += n, sc2 += n; 0 < n; --n)
      *--sc1 = *--sc2;
  else
#if 0
    for (; 0 < n; --n)
      *sc1++ = *sc2++;
#else
    memcpy (sc1, sc2, n);
#endif
  return s1;
}