1: /* Copyright (C) 1991, 1997, 2003, 2004, 2005 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: #include <memcopy.h>
   21: 
   22: void *
   23: __memset_chk (dstpp, c, len, dstlen)
   24:      void *dstpp;
   25:      int c;
   26:      size_t len;
   27:      size_t dstlen;
   28: {
   29:   if (__builtin_expect (dstlen < len, 0))
   30:     __chk_fail ();
   31: 
   32:   long int dstp = (long int) dstpp;
   33: 
   34:   if (len >= 8)
   35:     {
   36:       size_t xlen;
   37:       op_t cccc;
   38: 
   39:       cccc = (unsigned char) c;
   40:       cccc |= cccc << 8;
   41:       cccc |= cccc << 16;
   42:       if (OPSIZ > 4)
   43:         /* Do the shift in two steps to avoid warning if long has 32 bits.  */
   44:         cccc |= (cccc << 16) << 16;
   45: 
   46:       /* There are at least some bytes to set.
   47:          No need to test for LEN == 0 in this alignment loop.  */
   48:       while (dstp % OPSIZ != 0)
   49:         {
   50:           ((byte *) dstp)[0] = c;
   51:           dstp += 1;
   52:           len -= 1;
   53:         }
   54: 
   55:       /* Write 8 `op_t' per iteration until less than 8 `op_t' remain.  */
   56:       xlen = len / (OPSIZ * 8);
   57:       while (xlen > 0)
   58:         {
   59:           ((op_t *) dstp)[0] = cccc;
   60:           ((op_t *) dstp)[1] = cccc;
   61:           ((op_t *) dstp)[2] = cccc;
   62:           ((op_t *) dstp)[3] = cccc;
   63:           ((op_t *) dstp)[4] = cccc;
   64:           ((op_t *) dstp)[5] = cccc;
   65:           ((op_t *) dstp)[6] = cccc;
   66:           ((op_t *) dstp)[7] = cccc;
   67:           dstp += 8 * OPSIZ;
   68:           xlen -= 1;
   69:         }
   70:       len %= OPSIZ * 8;
   71: 
   72:       /* Write 1 `op_t' per iteration until less than OPSIZ bytes remain.  */
   73:       xlen = len / OPSIZ;
   74:       while (xlen > 0)
   75:         {
   76:           ((op_t *) dstp)[0] = cccc;
   77:           dstp += OPSIZ;
   78:           xlen -= 1;
   79:         }
   80:       len %= OPSIZ;
   81:     }
   82: 
   83:   /* Write the last few bytes.  */
   84:   while (len > 0)
   85:     {
   86:       ((byte *) dstp)[0] = c;
   87:       dstp += 1;
   88:       len -= 1;
   89:     }
   90: 
   91:   return dstpp;
   92: }