~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 <mystrings/m_string.h>

#include "my_static.h"

static char *find_file_in_path(char *to,const char *name);

	/* Finds where program can find it's files.

	   pre_pathname is found by first locking at progname (argv[0]).

	   if progname contains path the path is returned.

	   else if progname is found in path, return it

	   else if progname is given and POSIX environment variable "_" is set

	   then path is taken from "_".

	   If filename doesn't contain a path append MY_BASEDIR_VERSION or

	   MY_BASEDIR if defined, else append "/my/running".

	   own_path_name_part is concatinated to result.

	   my_path puts result in to and returns to */

char * my_path(char * to, const char *progname,

               const char *own_pathname_part)

{

  char *start, *end, *prog;

  size_t to_length;

  start=to;					/* Return this */

  if (progname && (dirname_part(to, progname, &to_length) ||

		   find_file_in_path(to,progname) ||

		   ((prog=getenv("_")) != 0 &&

                    dirname_part(to, prog, &to_length))))

  {

    intern_filename(to,to);

    if (!test_if_hard_path(to))

    {

      if (!my_getwd(curr_dir,FN_REFLEN,MYF(0)))

	bchange((unsigned char*) to, 0, (unsigned char*) curr_dir, strlen(curr_dir), strlen(to)+1);

    }

  }

  else

  {

    if ((end = getenv("MY_BASEDIR_VERSION")) == 0 &&

	(end = getenv("MY_BASEDIR")) == 0)

    {

#ifdef DEFAULT_BASEDIR

      end= (char*) DEFAULT_BASEDIR;

#else

      end= (char*) "/my/";

#endif

    }

    intern_filename(to,end);

    to= strchr(to, '\0');

    if (to != start && to[-1] != FN_LIBCHAR)

      *to++ = FN_LIBCHAR;

    my_stpcpy(to,own_pathname_part);

  }

  return(start);

} /* my_path */

	/* test if file without filename is found in path */

	/* Returns to if found and to has dirpart if found, else NULL */

#define PATH_SEP ':'

static char *find_file_in_path(char *to, const char *name)

{

  char *path,*pos,dir[2];

  const char *ext="";

  if (!(path=getenv("PATH")))

    return NULL;

  dir[0]=FN_LIBCHAR; dir[1]=0;

#ifdef PROGRAM_EXTENSION

  if (!fn_ext(name)[0])

    ext=PROGRAM_EXTENSION;

#endif

  for (pos=path ; (pos=strchr(pos,PATH_SEP)) ; path= ++pos)

  {

    if (path != pos)

    {

      strxmov(my_stpncpy(to,path,(uint) (pos-path)),dir,name,ext,NULL);

      if (!access(to,F_OK))

      {

	to[(uint) (pos-path)+1]=0;	/* Return path only */

	return to;

      }

    }

  }

  return NULL;				/* File not found */

}