string/memccpy.c

   1 /* Copyright (C) 1991-2023 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    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <string.h>
  19
  20 #undef __memccpy
  21 #undef memccpy
  22
  23 #ifdef MEMCCPY
  24 # define __memccpy MEMCCPY
  25 #endif
  26
  27 /* Copy no more than N bytes of SRC to DEST, stopping when C is found.
  28    Return the position in DEST one byte past where C was copied, or
  29    NULL if C was not found in the first N bytes of SRC.  */
  30 void *
  31 __memccpy (void *dest, const void *src, int c, size_t n)
  32 {
  33   void *p = memchr (src, c, n);
  34
  35   if (p != NULL)
  36     return __mempcpy (dest, src, p - src + 1);
  37
  38   memcpy (dest, src, n);
  39   return NULL;
  40 }
  41
  42 weak_alias (__memccpy, memccpy)