~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/mysys_priv.h"

#include <mystrings/m_string.h>

#include "my_static.h"

#ifdef HAVE_PWD_H

#include <pwd.h>

#endif

static char * expand_tilde(char * *path);

/*

  remove unwanted chars from dirname

  SYNOPSIS

     cleanup_dirname()

     to		Store result here

     from	Dirname to fix.  May be same as to

  IMPLEMENTATION

  "/../" removes prev dir

  "/~/" removes all before ~

  //" is same as "/", except on Win32 at start of a file

  "/./" is removed

  Unpacks home_dir if "~/.." used

  Unpacks current dir if if "./.." used

  RETURN

    #  length of new name

*/

size_t cleanup_dirname(register char *to, const char *from)

{

  register size_t length;

  register char * pos;

  register const char * from_ptr;

  register char * start;

  char parent[5],				/* for "FN_PARENTDIR" */

       buff[FN_REFLEN+1],*end_parentdir;

  start=buff;

  from_ptr= from;

#ifdef FN_DEVCHAR

  if ((pos=strrchr(from_ptr,FN_DEVCHAR)) != 0)

  {						/* Skip device part */

    length=(size_t) (pos-from_ptr)+1;

    start= strncpy(buff,from_ptr,length);

    start+= strlen(from_ptr);

    from_ptr+=length;

  }

#endif

  parent[0]=FN_LIBCHAR;

  length= (size_t)((strcpy(parent+1,FN_PARENTDIR)+strlen(FN_PARENTDIR))-parent);

  for (pos=start ; (*pos= *from_ptr++) != 0 ; pos++)

  {

#ifdef BACKSLASH_MBTAIL

    uint32_t l;

    if (use_mb(fs) && (l= my_ismbchar(fs, from_ptr - 1, from_ptr + 2)))

    {

      for (l-- ; l ; *++pos= *from_ptr++, l--);

      start= pos + 1; /* Don't look inside multi-byte char */

      continue;

    }

#endif

    if (*pos == '/')

      *pos = FN_LIBCHAR;

    if (*pos == FN_LIBCHAR)

    {

      if ((size_t) (pos-start) > length &&

          memcmp(pos-length,parent,length) == 0)

      {						/* If .../../; skip prev */

	pos-=length;

	if (pos != start)

	{					 /* not /../ */

	  pos--;

	  if (*pos == FN_HOMELIB && (pos == start || pos[-1] == FN_LIBCHAR))

	  {

	    if (!home_dir)

	    {

	      pos+=length+1;			/* Don't unpack ~/.. */

	      continue;

	    }

	    pos= strcpy(buff,home_dir)+strlen(home_dir)-1;	/* Unpacks ~/.. */

	    if (*pos == FN_LIBCHAR)

	      pos--;				/* home ended with '/' */

	  }

	  if (*pos == FN_CURLIB && (pos == start || pos[-1] == FN_LIBCHAR))

	  {

	    if (getcwd(curr_dir,FN_REFLEN))

	    {

	      pos+=length+1;			/* Don't unpack ./.. */

	      continue;

	    }

	    pos= strcpy(buff,curr_dir)+strlen(curr_dir)-1;	/* Unpacks ./.. */

	    if (*pos == FN_LIBCHAR)

	      pos--;				/* home ended with '/' */

	  }

	  end_parentdir=pos;

	  while (pos >= start && *pos != FN_LIBCHAR)	/* remove prev dir */

	    pos--;

	  if (pos[1] == FN_HOMELIB || memcmp(pos,parent,length) == 0)

	  {					/* Don't remove ~user/ */

	    pos= strcpy(end_parentdir+1,parent)+strlen(parent);

	    *pos=FN_LIBCHAR;

	    continue;

	  }

	}

      }

      else if ((size_t) (pos-start) == length-1 &&

	       !memcmp(start,parent+1,length-1))

	start=pos;				/* Starts with "../" */

      else if (pos-start > 0 && pos[-1] == FN_LIBCHAR)

      {

#ifdef FN_NETWORK_DRIVES

	if (pos-start != 1)

#endif

	  pos--;			/* Remove dupplicate '/' */

      }

      else if (pos-start > 1 && pos[-1] == FN_CURLIB && pos[-2] == FN_LIBCHAR)

	pos-=2;					/* Skip /./ */

      else if (pos > buff+1 && pos[-1] == FN_HOMELIB && pos[-2] == FN_LIBCHAR)

      {					/* Found ..../~/  */

	buff[0]=FN_HOMELIB;

	buff[1]=FN_LIBCHAR;

	start=buff; pos=buff+1;

      }

    }

  }

  (void) strcpy(to,buff);

  return((size_t) (pos-buff));

} /* cleanup_dirname */

/*

  On system where you don't have symbolic links, the following

  code will allow you to create a file:

  directory-name.sym that should contain the real path

  to the directory.  This will be used if the directory name

  doesn't exists

*/

bool my_use_symdir=0;	/* Set this if you want to use symdirs */

#ifdef USE_SYMDIR

void symdirget(char *dir)

{

  char buff[FN_REFLEN];

  char *pos= strchr(dir, '\0');

  if (dir[0] && pos[-1] != FN_DEVCHAR && my_access(dir, F_OK))

  {

    File file;

    size_t length;

    char temp= *(--pos);            /* May be "/" or "\" */

    strcpy(pos,".sym");

    file= my_open(dir, O_RDONLY, MYF(0));

    *pos++=temp; *pos=0;	  /* Restore old filename */

    if (file >= 0)

    {

      if ((length= my_read(file, buff, sizeof(buff), MYF(0))) > 0)

      {

        for (pos= buff + length ;

             pos > buff && (iscntrl(pos[-1]) || isspace(pos[-1])) ;

             pos --);

        /* Ensure that the symlink ends with the directory symbol */

        if (pos == buff || pos[-1] != FN_LIBCHAR)

          *pos++=FN_LIBCHAR;

        strncpy(dir,buff, FN_REFLEN-1);

      }

      my_close(file, MYF(0));

    }

  }

}

#endif /* USE_SYMDIR */

/*

  Fixes a directroy name so that can be used by open()

  SYNOPSIS

    unpack_dirname()

    to			result-buffer, FN_REFLEN characters. may be == from

    from		'Packed' directory name (may contain ~)

 IMPLEMENTATION

  Make that last char of to is '/' if from not empty and

  from doesn't end in FN_DEVCHAR

  Uses cleanup_dirname and changes ~/.. to home_dir/..

  Changes a UNIX filename to system filename (replaces / with \ on windows)

  RETURN

   Length of new directory name (= length of to)

*/

size_t unpack_dirname(char * to, const char *from)

{

  size_t length, h_length;

  char buff[FN_REFLEN+1+4],*suffix,*tilde_expansion;

  (void) intern_filename(buff,from);	    /* Change to intern name */

  length= strlen(buff);                     /* Fix that '/' is last */

  if (length &&

#ifdef FN_DEVCHAR

      buff[length-1] != FN_DEVCHAR &&

#endif

      buff[length-1] != FN_LIBCHAR && buff[length-1] != '/')

  {

    buff[length]=FN_LIBCHAR;

    buff[length+1]= '\0';

  }

  length=cleanup_dirname(buff,buff);

  if (buff[0] == FN_HOMELIB)

  {

    suffix=buff+1; tilde_expansion=expand_tilde(&suffix);

    if (tilde_expansion)

    {

      length-= (size_t) (suffix-buff)-1;

      if (length+(h_length= strlen(tilde_expansion)) <= FN_REFLEN)

      {

	if (tilde_expansion[h_length-1] == FN_LIBCHAR)

	  h_length--;

	if (buff+h_length < suffix)

          memmove(buff+h_length, suffix, length);

	else

	  bmove_upp((unsigned char*) buff+h_length+length, (unsigned char*) suffix+length, length);

        memmove(buff, tilde_expansion, h_length);

      }

    }

  }

#ifdef USE_SYMDIR

  if (my_use_symdir)

    symdirget(buff);

#endif

  return(system_filename(to,buff));	/* Fix for open */

} /* unpack_dirname */

	/* Expand tilde to home or user-directory */

	/* Path is reset to point at FN_LIBCHAR after ~xxx */

static char * expand_tilde(char * *path)

{

  if (path[0][0] == FN_LIBCHAR)

    return home_dir;			/* ~/ expanded to home */

#ifdef HAVE_GETPWNAM

  {

    char *str,save;

    struct passwd *user_entry;

    if (!(str=strchr(*path,FN_LIBCHAR)))

      str= strchr(*path, '\0');

    save= *str; *str= '\0';

    user_entry=getpwnam(*path);

    *str=save;

    endpwent();

    if (user_entry)

    {

      *path=str;

      return user_entry->pw_dir;

    }

  }

#endif

  return NULL;

}

/*

  Fix filename so it can be used by open, create

  SYNOPSIS

    unpack_filename()

    to		Store result here. Must be at least of size FN_REFLEN.

    from	Filename in unix format (with ~)

  RETURN

    # length of to

  NOTES

    to may be == from

    ~ will only be expanded if total length < FN_REFLEN

*/

size_t unpack_filename(char * to, const char *from)

{

  size_t length, n_length, buff_length;

  char buff[FN_REFLEN];

  length=dirname_part(buff, from, &buff_length);/* copy & convert dirname */

  n_length=unpack_dirname(buff,buff);

  if (n_length+strlen(from+length) < FN_REFLEN)

  {

    (void) strcpy(buff+n_length,from+length);

    length= system_filename(to,buff);		/* Fix to usably filename */

  }

  else

    length= system_filename(to,from);		/* Fix to usably filename */

  return(length);

} /* unpack_filename */

	/* Convert filename (unix standard) to system standard */

	/* Used before system command's like open(), create() .. */

	/* Returns used length of to; total length should be FN_REFLEN */

size_t system_filename(char * to, const char *from)

{

#ifndef FN_C_BEFORE_DIR

  return strlen(strncpy(to,from,FN_REFLEN-1));

#else	/* VMS */

	/* change 'dev:lib/xxx' to 'dev:[lib]xxx' */

	/* change 'dev:xxx' to 'dev:xxx' */

	/* change './xxx' to 'xxx' */

	/* change './lib/' or lib/ to '[.lib]' */

	/* change '/x/y/z to '[x.y]x' */

	/* change 'dev:/x' to 'dev:[000000]x' */

  int libchar_found;

  size_t length;

  char * to_pos,from_pos,pos;

  char buff[FN_REFLEN];

  libchar_found=0;

  (void) strcpy(buff,from);			 /* If to == from */

  from_pos= buff;

  if ((pos=strrchr(from_pos,FN_DEVCHAR)))	/* Skip device part */

  {

    pos++;

    to_pos= strncpy(to,from_pos,(size_t) (pos-from_pos));

    to_pos+= strlen(to);

    from_pos=pos;

  }

  else

    to_pos=to;

  if (from_pos[0] == FN_CURLIB && from_pos[1] == FN_LIBCHAR)

    from_pos+=2;				/* Skip './' */

  if (strchr(from_pos,FN_LIBCHAR))

  {

    *(to_pos++) = FN_C_BEFORE_DIR;

    if (strstr(from_pos,FN_ROOTDIR) == from_pos)

    {

      from_pos+=strlen(FN_ROOTDIR);		/* Actually +1 but... */

      if (! strchr(from_pos,FN_LIBCHAR))

      {						/* No dir, use [000000] */

	to_pos= strcpy(to_pos,FN_C_ROOT_DIR)+strlen(FN_C_ROOT_DIR);

	libchar_found++;

      }

    }

    else

      *(to_pos++)=FN_C_DIR_SEP;			/* '.' gives current dir */

    while ((pos=strchr(from_pos,FN_LIBCHAR)))

    {

      if (libchar_found++)

        *(to_pos++)=FN_C_DIR_SEP;		/* Add '.' between dirs */

      if (strstr(from_pos,FN_PARENTDIR) == from_pos &&

          from_pos+strlen(FN_PARENTDIR) == pos) {

        to_pos= strcpy(to_pos,FN_C_PARENT_DIR);	/* Found '../' */

        to_pos+= strlen(FN_C_PARENT_DIR);

      }

      else

      {

        to_pos= strncpy(to_pos,from_pos,(size_t) (pos-from_pos));

        to_pos+= strlen(to_pos);

      }

      from_pos=pos+1;

    }

    *(to_pos++)=FN_C_AFTER_DIR;

  }

  strcpy(to_pos, from_pos);

  length= strlen(to);

  return(length);

#endif

} /* system_filename */

	/* Fix a filename to intern (UNIX format) */

char *intern_filename(char *to, const char *from)

{

  size_t length, to_length;

  char buff[FN_REFLEN];

  if (from == to)

  {						/* Dirname may destroy from */

    strcpy(buff,from);

    from=buff;

  }

  length= dirname_part(to, from, &to_length);	/* Copy dirname & fix chars */

  (void) strcpy(to + to_length,from+length);

  return (to);

} /* intern_filename */