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