sysdeps/generic/memccpy.c

   1 /* Copyright (C) 1991, 1995, 1997 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 not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 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; const void *src;
  30       int c; size_t n;
  31 {
  32   register const char *s = src;
  33   register char *d = dest;
  34   register const int x = (unsigned char) c;
  35   register size_t i = n;
  36
  37   while (i-- > 0)
  38     if ((*d++ = *s++) == x)
  39       return d;
  40
  41   return NULL;
  42 }
  43
  44 weak_alias (__memccpy, memccpy)