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gimp/libgimp/gimpenv.c

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/* LIBGIMP - The GIMP Library
*
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
* Copyright (C) 1999 Tor Lillqvist
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 Lesser 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 "config.h"
#include <glib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "gimpenv.h"
#ifdef G_OS_WIN32
#define STRICT
#include <windows.h> /* For GetModuleFileName */
#include <io.h>
#ifndef S_IWUSR
# define S_IWUSR _S_IWRITE
#endif
#ifndef S_IWGRP
#define S_IWGRP (_S_IWRITE>>3)
#define S_IWOTH (_S_IWRITE>>6)
#endif
#ifndef S_ISDIR
# define __S_ISTYPE(mode, mask) (((mode) & _S_IFMT) == (mask))
# define S_ISDIR(mode) __S_ISTYPE((mode), _S_IFDIR)
#endif
#define uid_t gint
#define gid_t gint
#define geteuid() 0
#define getegid() 0
#endif
#ifdef __EMX__
extern const char *__XOS2RedirRoot(const char *);
#endif
/**
* gimp_directory:
*
* Returns the user-specific GIMP settings directory. If the environment
* variable GIMP_DIRECTORY exists, it is used. If it is an absolute path,
* it is used as is. If it is a relative path, it is taken to be a
* subdirectory of the home directory. If it is relative path, and no home
* directory can be determined, it is taken to be a subdirectory of
* gimp_data_directory().
*
* The usual case is that no GIMP_DIRECTORY environment variable exists,
* and then we use the GIMPDIR subdirectory of the home directory. If no
* home directory exists, we use a per-user subdirectory of
* gimp_data_directory().
* In any case, we always return some non-empty string, whether it
* corresponds to an existing directory or not.
*
* The returned string is allocated just once, and should *NOT* be
* freed with g_free().
*
* Returns: The user-specific GIMP settings directory.
*/
gchar*
gimp_directory (void)
{
static gchar *gimp_dir = NULL;
gchar *env_gimp_dir;
gchar *home_dir;
if (gimp_dir != NULL)
return gimp_dir;
env_gimp_dir = g_getenv ("GIMP_DIRECTORY");
home_dir = g_get_home_dir ();
if (NULL != env_gimp_dir)
{
if (g_path_is_absolute (env_gimp_dir))
gimp_dir = g_strdup(env_gimp_dir);
else
{
if (NULL != home_dir)
{
gimp_dir = g_strconcat (home_dir,
G_DIR_SEPARATOR_S,
env_gimp_dir,
NULL);
}
else
{
gimp_dir = g_strconcat (gimp_data_directory (),
G_DIR_SEPARATOR_S,
env_gimp_dir,
NULL);
}
}
}
else
{
#ifdef __EMX__
gimp_dir = g_strdup(__XOS2RedirRoot(GIMPDIR));
return gimp_dir;
#endif
if (NULL != home_dir)
{
gimp_dir = g_strconcat (home_dir, G_DIR_SEPARATOR_S,
GIMPDIR, NULL);
}
else
{
#ifndef G_OS_WIN32
g_message ("warning: no home directory.");
#endif
gimp_dir = g_strconcat (gimp_data_directory (),
G_DIR_SEPARATOR_S,
GIMPDIR,
".",
g_get_user_name (),
NULL);
}
}
return gimp_dir;
}
/**
* gimp_personal_rc_file:
* @basename: The basename of a rc_file.
*
* Returns the name of a file in the user-specific GIMP settings directory.
*
* The returned string is allocated dynamically and *SHOULD* be freed
* with g_free() after use.
*
* Returns: The name of a file in the user-specific GIMP settings directory.
*/
gchar*
gimp_personal_rc_file (gchar *basename)
{
return g_strconcat (gimp_directory (),
G_DIR_SEPARATOR_S,
basename,
NULL);
}
/**
* gimp_data_directory:
*
* Returns the top directory for GIMP data. If the environment variable
* GIMP_DATADIR exists, that is used. It should be an absolute pathname.
* Otherwise, on Unix the compile-time defined directory is used. On
* Win32, the installation directory as deduced from the executable's
* name is used.
*
* The returned string is allocated just once, and should *NOT* be
* freed with g_free().
*
* Returns: The top directory for GIMP data.
*/
gchar*
gimp_data_directory (void)
{
static gchar *gimp_data_dir = NULL;
gchar *env_gimp_data_dir = NULL;
if (gimp_data_dir != NULL)
return gimp_data_dir;
env_gimp_data_dir = g_getenv ("GIMP_DATADIR");
if (NULL != env_gimp_data_dir)
{
if (!g_path_is_absolute (env_gimp_data_dir))
g_error ("GIMP_DATADIR environment variable should be an absolute path.");
#ifndef __EMX__
gimp_data_dir = g_strdup (env_gimp_data_dir);
#else
gimp_data_dir = g_strdup (__XOS2RedirRoot(env_gimp_data_dir));
#endif
}
else
{
#ifndef G_OS_WIN32
#ifndef __EMX__
gimp_data_dir = DATADIR;
#else
gimp_data_dir = g_strdup(__XOS2RedirRoot(DATADIR));
#endif
#else
/* Figure it out from the executable name */
gchar filename[MAX_PATH];
gchar *sep1, *sep2;
if (GetModuleFileName (NULL, filename, sizeof (filename)) == 0)
g_error ("GetModuleFilename failed\n");
/* If the executable file name is of the format
* <foobar>\bin\gimp.exe of <foobar>\plug-ins\filter.exe, * use
* <foobar>. Otherwise, use the directory where the executable
* is.
*/
sep1 = strrchr (filename, G_DIR_SEPARATOR);
*sep1 = '\0';
sep2 = strrchr (filename, G_DIR_SEPARATOR);
if (sep2 != NULL)
{
if (g_strcasecmp (sep2 + 1, "bin") == 0
|| g_strcasecmp (sep2 + 1, "plug-ins") == 0)
*sep2 = '\0';
}
gimp_data_dir = g_strdup (filename);
#endif
}
return gimp_data_dir;
}
/**
* gimp_gtkrc:
*
* Returns the name of the GIMP's application-specific gtkrc file.
*
* The returned string is allocated just once, and should *NOT* be
* freed with g_free().
*
* Returns: The name of the GIMP's application-specific gtkrc file.
*/
gchar*
gimp_gtkrc (void)
{
static gchar *gimp_gtkrc_filename = NULL;
if (gimp_gtkrc_filename != NULL)
return gimp_gtkrc_filename;
gimp_gtkrc_filename = g_strconcat (gimp_directory (),
G_DIR_SEPARATOR_S,
"gtkrc",
NULL);
return gimp_gtkrc_filename;
}
/**
* gimp_path_parse:
* @path: A list of directories separated by #G_SEARCHPATH_SEPARATOR.
* @max_paths: The maximum number of directories to return.
* @check: #TRUE if you want the directories to be checked.
* @check_failed: Returns a #GList of path elements for which the
* check failed. Each list element is guaranteed
* to end with a #G_PATH_SEPARATOR.
*
* Returns: A #GList of all directories in @path. Each list element
* is guaranteed to end with a #G_PATH_SEPARATOR.
*/
GList *
gimp_path_parse (gchar *path,
gint max_paths,
gboolean check,
GList **check_failed)
{
gchar *home;
gchar **patharray;
GList *list = NULL;
GList *fail_list = NULL;
gint i;
struct stat filestat;
gint err = FALSE;
if (!path || !*path || max_paths < 1 || max_paths > 256)
return NULL;
home = g_get_home_dir ();
patharray = g_strsplit (path, G_SEARCHPATH_SEPARATOR_S, max_paths);
for (i = 0; i < max_paths; i++)
{
GString *dir;
if (!patharray[i])
break;
#ifndef G_OS_WIN32
if (*patharray[i] == '~')
{
dir = g_string_new (home);
g_string_append (dir, patharray[i] + 1);
}
else
#endif
{
dir = g_string_new (patharray[i]);
}
#ifdef __EMX__
_fnslashify (dir);
#endif
if (check)
{
/* check if directory exists */
err = stat (dir->str, &filestat);
if (!err && S_ISDIR (filestat.st_mode))
{
if (dir->str[dir->len - 1] != G_DIR_SEPARATOR)
g_string_append_c (dir, G_DIR_SEPARATOR);
}
}
if (!err)
list = g_list_prepend (list, g_strdup (dir->str));
else if (check_failed)
fail_list = g_list_prepend (fail_list, g_strdup (dir->str));
g_string_free (dir, TRUE);
}
g_strfreev (patharray);
list = g_list_reverse (list);
if (check && check_failed)
{
fail_list = g_list_reverse (fail_list);
*check_failed = fail_list;
}
return list;
}
/**
* gimp_path_to_str:
* @path: A list of directories as returned by gimp_path_parse().
*
* Returns: A searchpath string separated by #G_SEARCHPATH_SEPARATOR.
*
*/
gchar *
gimp_path_to_str (GList *path)
{
GString *str = NULL;
GList *list;
gchar *retval = NULL;
for (list = path; list; list = g_list_next (list))
{
if (str)
{
g_string_append_c (str, G_SEARCHPATH_SEPARATOR);
g_string_append (str, (gchar *) list->data);
}
else
{
str = g_string_new ((gchar *) list->data);
}
}
if (str)
{
retval = str->str;
g_string_free (str, FALSE);
}
return retval;
}
/**
* gimp_path_free:
* @path: A list of directories as returned by gimp_path_parse().
*
* This function frees the memory allocated for the list and it's strings.
*
*/
void
gimp_path_free (GList *path)
{
GList *list;
if (path)
{
for (list = path; list; list = g_list_next (list))
{
g_free (list->data);
}
g_list_free (path);
}
}
/**
* gimp_path_get_user_writable_dir:
* @path: A list of directories as returned by gimp_path_parse().
*
* Note that you have to g_free() the returned string.
*
* Returns: The first directory in @path where the user has write permission.
*
*/
gchar *
gimp_path_get_user_writable_dir (GList *path)
{
GList *list;
uid_t euid;
gid_t egid;
struct stat filestat;
gint err;
euid = geteuid ();
egid = getegid ();
for (list = path; list; list = g_list_next (list))
{
/* check if directory exists */
/* ugly hack to handle paths with an extra G_DIR_SEPARATOR
* attached. The stat() in MSVCRT doesn't like that.
*/
gchar *dir = g_strdup ((gchar *) list->data);
gchar *p = dir;
gint pl;
if (g_path_is_absolute (dir))
p = g_path_skip_root (dir);
pl = strlen (p);
if (pl > 0 && p[pl-1] == G_DIR_SEPARATOR)
p[pl-1] = '\0';
err = stat (dir, &filestat);
g_free (dir);
/* this is tricky:
* if a file is e.g. owned by the current user but not user-writable,
* the user has no permission to write to the file regardless
* of his group's or other's write permissions
*/
if (!err && S_ISDIR (filestat.st_mode) &&
((filestat.st_mode & S_IWUSR) ||
((filestat.st_mode & S_IWGRP) &&
(euid != filestat.st_uid)) ||
((filestat.st_mode & S_IWOTH) &&
(euid != filestat.st_uid) &&
(egid != filestat.st_gid))))
{
return g_strdup ((gchar *) list->data);
}
}
return NULL;
}
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