~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 */

#include "mysys_priv.h"

#include <m_string.h>

/*

  Formats a filename with possible replace of directory of extension

  Function can handle the case where 'to' == 'name'

  For a description of the flag values, consult my_sys.h

  The arguments should be in unix format.

*/

char * fn_format(char * to, const char *name, const char *dir,

		    const char *extension, uint flag)

{

  char dev[FN_REFLEN], buff[FN_REFLEN], *pos, *startpos;

  const char *ext;

  register size_t length;

  size_t dev_length;

  DBUG_ENTER("fn_format");

  DBUG_PRINT("enter",("name: %s  dir: %s  extension: %s  flag: %d",

		       name,dir,extension,flag));

  /* Copy and skip directory */

  name+=(length=dirname_part(dev, (startpos=(char *) name), &dev_length));

  if (length == 0 || (flag & MY_REPLACE_DIR))

  {

    /* Use given directory */

    convert_dirname(dev,dir,NullS);		/* Fix to this OS */

  }

  else if ((flag & MY_RELATIVE_PATH) && !test_if_hard_path(dev))

  {

    /* Put 'dir' before the given path */

    strmake(buff,dev,sizeof(buff)-1);

    pos=convert_dirname(dev,dir,NullS);

    strmake(pos,buff,sizeof(buff)-1- (int) (pos-dev));

  }

  if (flag & MY_PACK_FILENAME)

    pack_dirname(dev,dev);			/* Put in ./.. and ~/.. */

  if (flag & MY_UNPACK_FILENAME)

    (void) unpack_dirname(dev,dev);		/* Replace ~/.. with dir */

  if (!(flag & MY_APPEND_EXT) &&

      (pos= (char*) strchr(name,FN_EXTCHAR)) != NullS)

  {

    if ((flag & MY_REPLACE_EXT) == 0)		/* If we should keep old ext */

    {

      length=strlength(name);			/* Use old extension */

      ext = "";

    }

    else

    {

      length= (size_t) (pos-(char*) name);	/* Change extension */

      ext= extension;

    }

  }

  else

  {

    length=strlength(name);			/* No ext, use the now one */

    ext=extension;

  }

  if (strlen(dev)+length+strlen(ext) >= FN_REFLEN || length >= FN_LEN )

  {

    /* To long path, return original or NULL */

    size_t tmp_length;

    if (flag & MY_SAFE_PATH)

      return NullS;

    tmp_length= strlength(startpos);

    DBUG_PRINT("error",("dev: '%s'  ext: '%s'  length: %u",dev,ext,

                        (uint) length));

    (void) strmake(to,startpos,min(tmp_length,FN_REFLEN-1));

  }

  else

  {

    if (to == startpos)

    {

      bmove(buff,(uchar*) name,length);		/* Save name for last copy */

      name=buff;

    }

    pos=strmake(strmov(to,dev),name,length);

    (void) strmov(pos,ext);			/* Don't convert extension */

  }

  /*

    If MY_RETURN_REAL_PATH and MY_RESOLVE_SYMLINK is given, only do

    realpath if the file is a symbolic link

  */

  if (flag & MY_RETURN_REAL_PATH)

    (void) my_realpath(to, to, MYF(flag & MY_RESOLVE_SYMLINKS ?

				   MY_RESOLVE_LINK: 0));

  else if (flag & MY_RESOLVE_SYMLINKS)

  {

    strmov(buff,to);

    (void) my_readlink(to, buff, MYF(0));

  }

  DBUG_RETURN(to);

} /* fn_format */

/*

  strlength(const string str)

  Return length of string with end-space:s not counted.

*/

size_t strlength(const char *str)

{

  register const char * pos;

  register const char * found;

  DBUG_ENTER("strlength");

  pos= found= str;

  while (*pos)

  {

    if (*pos != ' ')

    {

      while (*++pos && *pos != ' ') {};

      if (!*pos)

      {

	found=pos;			/* String ends here */

	break;

      }

    }

    found=pos;

    while (*++pos == ' ') {};

  }

  DBUG_RETURN((size_t) (found - str));

} /* strlength */