~drizzle-trunk/drizzle/development

/* Copyright (C) 2000 MySQL AB

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

/*  File   : bchange.c

    Author : Michael widenius

    Updated: 1987-03-20

    Defines: bchange()

    bchange(dst, old_length, src, new_length, tot_length)

    replaces old_length characters at dst to new_length characters from

    src in a buffer with tot_length bytes.

*/

#include "m_string.h"

void bchange(register unsigned char *dst, size_t old_length,

             register const unsigned char *src,

	     size_t new_length, size_t tot_length)

{

  size_t rest=tot_length-old_length;

  if (old_length < new_length)

    bmove_upp(dst+rest+new_length,dst+tot_length,rest);

  else

    memcpy(dst+new_length, dst+old_length, rest);

  memcpy(dst,src,new_length);

}