~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   : strmake.c

    Author : Michael Widenius

    Updated: 20 Jul 1984

    Defines: strmake()

    strmake(dst,src,length) moves length characters, or until end, of src to

    dst and appends a closing NUL to dst.

    Note that if strlen(src) >= length then dst[length] will be set to \0

    strmake() returns pointer to closing null

*/

#include <my_global.h>

#include "m_string.h"

char *strmake(register char *dst, register const char *src, size_t length)

{

#ifdef EXTRA_DEBUG

  /*

    'length' is the maximum length of the string; the buffer needs

    to be one character larger to accomodate the terminating '\0'.

    This is easy to get wrong, so we make sure we write to the

    entire length of the buffer to identify incorrect buffer-sizes.

    We only initialise the "unused" part of the buffer here, a) for

    efficiency, and b) because dst==src is allowed, so initialising

    the entire buffer would overwrite the source-string. Also, we

    write a character rather than '\0' as this makes spotting these

    problems in the results easier.

  */

  uint n= 0;

  while (n < length && src[n++]);

  memset(dst + n, (int) 'Z', length - n + 1);

#endif

  while (length--)

    if (! (*dst++ = *src++))

      return dst-1;

  *dst=0;

  return dst;

}