glibc/string/memccpy.c

/* Copyright (C) 1991-2021 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <string.h>

#undef __memccpy
#undef memccpy

#ifdef MEMCCPY
# define __memccpy MEMCCPY
#endif

/* Copy no more than N bytes of SRC to DEST, stopping when C is found.
   Return the position in DEST one byte past where C was copied, or
   NULL if C was not found in the first N bytes of SRC.  */
void *
__memccpy (void *dest, const void *src, int c, size_t n)
{
  void *p = memchr (src, c, n);

  if (p != NULL)
    return __mempcpy (dest, src, p - src + 1);

  memcpy (dest, src, n);
  return NULL;
}

weak_alias (__memccpy, memccpy)