gimp/app/config/gimpconfig-path.c

257 lines
6.2 KiB
C

/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* String substitution utilities for config files
* Copyright (C) 2001 Sven Neumann <sven@gimp.org>
*
* 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; 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 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 <stdio.h>
#include <string.h>
#include <glib-object.h>
#include "libgimpbase/gimpbase.h"
#include "gimpconfig-path.h"
#include "gimp-intl.h"
#define SUBSTS_ALLOC 4
static gchar * gimp_config_path_expand_only (const gchar *path,
GError **error);
static inline gchar * extract_token (const gchar **str);
/**
* gimp_config_path_expand:
* @path: a %NUL-terminated string in UTF-8 encoding
* @recode: whether to convert to the filesystem's encoding
* @error: return location for errors
*
* Paths as stored in the gimprc have to be treated special. The
* string may contain special identifiers such as for example
* ${gimp_dir} that have to be substituted before use. Also the user's
* filesystem may be in a different encoding than UTF-8 (which is what
* is used for the gimprc). This function does the variable
* substitution for you and can also attempt to convert to the
* filesystem encoding.
*
* Return value: a newly allocated %NUL-terminated string
**/
gchar *
gimp_config_path_expand (const gchar *path,
gboolean recode,
GError **error)
{
g_return_val_if_fail (path != NULL, NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
if (recode)
{
gchar *retval;
gchar *expanded = gimp_config_path_expand_only (path, error);
if (! expanded)
return NULL;
retval = g_filename_from_utf8 (expanded, -1, NULL, NULL, error);
g_free (expanded);
return retval;
}
return gimp_config_path_expand_only (path, error);
}
static gchar *
gimp_config_path_expand_only (const gchar *path,
GError **error)
{
const gchar *p;
const gchar *s;
gchar *n;
gchar *token;
gchar *filename = NULL;
gchar *expanded = NULL;
gchar **substs = NULL;
guint n_substs = 0;
gint length = 0;
gint i;
p = path;
while (*p)
{
#ifndef G_OS_WIN32
if (*p == '~')
{
length += strlen (gimp_filename_to_utf8 (g_get_home_dir ()));
p += 1;
}
else
#endif /* G_OS_WIN32 */
if ((token = extract_token (&p)) != NULL)
{
for (i = 0; i < n_substs; i++)
if (strcmp (substs[2*i], token) == 0)
break;
if (i < n_substs)
{
s = substs[2*i+1];
}
else
{
s = NULL;
if (strcmp (token, "gimp_dir") == 0)
s = gimp_directory ();
else if (strcmp (token, "gimp_data_dir") == 0)
s = gimp_data_directory ();
else if (strcmp (token, "gimp_plug_in_dir") == 0 ||
strcmp (token, "gimp_plugin_dir") == 0)
s = gimp_plug_in_directory ();
else if (strcmp (token, "gimp_sysconf_dir") == 0)
s = gimp_sysconf_directory ();
if (!s)
s = g_getenv (token);
#ifdef G_OS_WIN32
/* The default user gimprc on Windows references
* ${TEMP}, but not all Windows installations have that
* environment variable, even if it should be kinda
* standard. So special-case it.
*/
if (!s && strcmp (token, "TEMP") == 0)
s = g_get_tmp_dir ();
#endif /* G_OS_WIN32 */
}
if (!s)
{
g_set_error (error, 0, 0, _("Cannot expand ${%s}"), token);
g_free (token);
goto cleanup;
}
if (n_substs % SUBSTS_ALLOC == 0)
substs = g_renew (gchar *, substs, 2 * (n_substs + SUBSTS_ALLOC));
substs[2*n_substs] = token;
substs[2*n_substs + 1] = (gchar *) gimp_filename_to_utf8 (s);
length += strlen (substs[2*n_substs + 1]);
n_substs++;
}
else
{
length += g_utf8_skip[(const guchar) *p];
p = g_utf8_next_char (p);
}
}
if (n_substs == 0)
return g_strdup (path);
expanded = g_new (gchar, length + 1);
p = path;
n = expanded;
while (*p)
{
#ifndef G_OS_WIN32
if (*p == '~')
{
*n = '\0';
strcat (n, gimp_filename_to_utf8 (g_get_home_dir ()));
n += strlen (gimp_filename_to_utf8 (g_get_home_dir ()));
p += 1;
}
else
#endif /* G_OS_WIN32 */
if ((token = extract_token (&p)) != NULL)
{
for (i = 0; i < n_substs; i++)
{
if (strcmp (substs[2*i], token) == 0)
{
s = substs[2*i+1];
*n = '\0';
strcat (n, s);
n += strlen (s);
break;
}
}
g_free (token);
}
else
{
*n++ = *p++;
}
}
*n = '\0';
cleanup:
for (i = 0; i < n_substs; i++)
g_free (substs[2*i]);
g_free (substs);
g_free (filename);
return expanded;
}
static inline gchar *
extract_token (const gchar **str)
{
const gchar *p;
gchar *token;
if (strncmp (*str, "${", 2))
return NULL;
p = *str + 2;
while (*p && (*p != '}'))
p = g_utf8_next_char (p);
if (!p)
return NULL;
token = g_strndup (*str + 2, g_utf8_pointer_to_offset (*str + 2, p));
*str = p + 1; /* after the closing bracket */
return token;
}