usr/src/lib/libast/common/comp/memcpy.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #pragma prototyped
  23
  24 #include <ast.h>
  25
  26 #if _lib_memcpy
  27
  28 NoN(memcpy)
  29
  30 #else
  31
  32 #undef  memcpy
  33
  34 #if _lib_bcopy
  35
  36 extern void     bcopy(void*, void*, size_t);
  37
  38 void*
  39 memcpy(void* s1, void* s2, size_t n)
  40 {
  41         bcopy(s2, s1, n);
  42         return(s1);
  43 }
  44
  45 #else
  46
  47 void*
  48 memcpy(void* as1, const void* as2, register size_t n)
  49 {
  50         register char*          s1 = (char*)as1;
  51         register const char*    s2 = (const char*)as2;
  52
  53         while (n-- > 0)
  54                 *s1++ = *s2++;
  55         return(as1);
  56 }
  57
  58 #endif
  59
  60 #endif