sysdeps/vax/memccpy.c

   1 /* Copyright (C) 1991, 1992, 1995, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <string.h>
  20
  21 /* Copy no more than N bytes of SRC to DEST, stopping when C is found.
  22    Return the position in DEST one byte past where C was copied,
  23    or NULL if C was not found in the first N bytes of SRC.  */
  24 void *
  25 __memccpy (dest, src, c, n)
  26      void *dest;
  27      const void *src;
  28      int c;
  29      size_t nbytes;
  30 {
  31   /* Except when N > 65535, this is what a hand-coded version would
  32      do anyway.  */
  33
  34   void *found = memchr (src, c, n);
  35
  36   if (found == NULL)
  37     {
  38       (void) memcpy (dest, src, n);
  39       return NULL;
  40     }
  41
  42   (void) memcpy (dest, src, (char *) found + 1 - (char *) src);
  43   return (PTR) ((char *) dest + ((char *) found + 1 - (char *) src));
  44 }
  45
  46 weak_alias (__memccpy, memccpy)