string/memccpy.c

   1 /* Copyright (C) 1991-2014 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <string.h>
  19
  20 #undef __memccpy
  21 #undef memccpy
  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, or
  25    NULL if C was not found in the first N bytes of SRC.  */
  26 void *
  27 __memccpy (dest, src, c, n)
  28       void *dest;
  29       const void *src;
  30       int c;
  31       size_t n;
  32 {
  33   const char *s = src;
  34   char *d = dest;
  35   const char x = c;
  36   size_t i = n;
  37
  38   while (i-- > 0)
  39     if ((*d++ = *s++) == x)
  40       return d;
  41
  42   return NULL;
  43 }
  44
  45 weak_alias (__memccpy, memccpy)