sysdeps/vax/memccpy.c

   1 /* Copyright (C) 1991, 1992, 1995 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <string.h>
  21
  22
  23 /* Copy no more than N bytes of SRC to DEST, stopping when C is found.
  24    Return the position in DEST one byte past where C was copied,
  25    or NULL if C was not found in the first N bytes of SRC.  */
  26 PTR
  27 DEFUN(__memccpy, (dest, src, c, n),
  28       PTR dest AND CONST PTR src AND int c AND size_t nbytes)
  29 {
  30   /* Except when N > 65535, this is what a hand-coded version would
  31      do anyway.  */
  32
  33   PTR found = memchr (src, c, n);
  34
  35   if (found == NULL)
  36     {
  37       (void) memcpy (dest, src, n);
  38       return NULL;
  39     }
  40
  41   (void) memcpy (dest, src, (char *) found + 1 - (char *) src);
  42   return (PTR) ((char *) dest + ((char *) found + 1 - (char *) src));
  43 }
  44
  45 weak_alias (__memccpy, memccpy)