string/memccpy.c

   1 /* Copyright (C) 1991, 1995, 1997, 1999, 2000 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 #undef __memccpy
  22 #undef memccpy
  23
  24 /* Copy no more than N bytes of SRC to DEST, stopping when C is found.
  25    Return the position in DEST one byte past where C was copied, or
  26    NULL if C was not found in the first N bytes of SRC.  */
  27 void *
  28 __memccpy (dest, src, c, n)
  29       void *dest;
  30       const void *src;
  31       int c;
  32       size_t n;
  33 {
  34   register const char *s = src;
  35   register char *d = dest;
  36   register const char x = c;
  37   register size_t i = n;
  38
  39   while (i-- > 0)
  40     if ((*d++ = *s++) == x)
  41       return d;
  42
  43   return NULL;
  44 }
  45
  46 weak_alias (__memccpy, memccpy)