usr/src/lib/libast/common/comp/memccpy.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_memccpy && !_UWIN
  27
  28 NoN(memccpy)
  29
  30 #else
  31
  32 /*
  33  * Copy s2 to s1, stopping if character c is copied. Copy no more than n bytes.
  34  * Return a pointer to the byte after character c in the copy,
  35  * or 0 if c is not found in the first n bytes.
  36  */
  37
  38 void*
  39 memccpy(void* as1, const void* as2, register int c, size_t n)
  40 {
  41         register char*          s1 = (char*)as1;
  42         register const char*    s2 = (char*)as2;
  43         register const char*    ep = s2 + n;
  44
  45         while (s2 < ep)
  46                 if ((*s1++ = *s2++) == c)
  47                         return(s1);
  48         return(0);
  49 }
  50
  51 #endif