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gimp/app/plug-in/gimpenvirontable.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpenvirontable.c
* (C) 2002 Manish Singh <yosh@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 <stdlib.h>
#include <string.h>
#include <glib-object.h>
#include <glib/gstdio.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpconfig/gimpconfig.h"
#include "core-types.h"
#include "gimpenvirontable.h"
#include "gimp-intl.h"
typedef struct _GimpEnvironValue GimpEnvironValue;
struct _GimpEnvironValue
{
gchar *value;
gchar *separator;
};
/* FIXME: check how portable this is */
extern char **environ;
static void gimp_environ_table_finalize (GObject *object);
static void gimp_environ_table_load_env_file (const GimpDatafileData *file_data,
gpointer user_data);
static gboolean gimp_environ_table_legal_name (gchar *name);
static void gimp_environ_table_populate (GimpEnvironTable *environ_table);
static void gimp_environ_table_populate_one (const gchar *name,
GimpEnvironValue *val,
GPtrArray *env_array);
static gboolean gimp_environ_table_pass_through (GimpEnvironTable *environ_table,
const gchar *name);
static void gimp_environ_table_clear_vars (GimpEnvironTable *environ_table);
static void gimp_environ_table_clear_internal (GimpEnvironTable *environ_table);
static void gimp_environ_table_clear_envp (GimpEnvironTable *environ_table);
static void gimp_environ_table_free_value (gpointer value);
G_DEFINE_TYPE (GimpEnvironTable, gimp_environ_table, G_TYPE_OBJECT);
#define parent_class gimp_environ_table_parent_class
static void
gimp_environ_table_class_init (GimpEnvironTableClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
object_class->finalize = gimp_environ_table_finalize;
}
static void
gimp_environ_table_init (GimpEnvironTable *environ_table)
{
environ_table->vars = NULL;
environ_table->internal = NULL;
environ_table->envp = NULL;
}
static void
gimp_environ_table_finalize (GObject *object)
{
GimpEnvironTable *environ_table = GIMP_ENVIRON_TABLE (object);
gimp_environ_table_clear_all (environ_table);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
GimpEnvironTable *
gimp_environ_table_new (void)
{
return g_object_new (GIMP_TYPE_ENVIRON_TABLE, NULL);
}
void
gimp_environ_table_load (GimpEnvironTable *environ_table,
const gchar *env_path)
{
g_return_if_fail (GIMP_IS_ENVIRON_TABLE (environ_table));
gimp_environ_table_clear (environ_table);
environ_table->vars =
g_hash_table_new_full (g_str_hash, g_str_equal,
g_free, gimp_environ_table_free_value);
gimp_datafiles_read_directories (env_path,
G_FILE_TEST_EXISTS,
gimp_environ_table_load_env_file,
environ_table);
}
void
gimp_environ_table_add (GimpEnvironTable *environ_table,
const gchar *name,
const gchar *value,
const gchar *separator)
{
GimpEnvironValue *val;
g_return_if_fail (GIMP_IS_ENVIRON_TABLE (environ_table));
gimp_environ_table_clear_envp (environ_table);
if (! environ_table->internal)
environ_table->internal =
g_hash_table_new_full (g_str_hash, g_str_equal,
g_free, gimp_environ_table_free_value);
val = g_new (GimpEnvironValue, 1);
val->value = g_strdup (value);
val->separator = g_strdup (separator);
g_hash_table_insert (environ_table->internal, g_strdup (name), val);
}
void
gimp_environ_table_remove (GimpEnvironTable *environ_table,
const gchar *name)
{
g_return_if_fail (GIMP_IS_ENVIRON_TABLE (environ_table));
if (! environ_table->internal)
return;
gimp_environ_table_clear_envp (environ_table);
g_hash_table_remove (environ_table->internal, name);
if (g_hash_table_size (environ_table->internal) == 0)
gimp_environ_table_clear_internal (environ_table);
}
void
gimp_environ_table_clear (GimpEnvironTable *environ_table)
{
g_return_if_fail (GIMP_IS_ENVIRON_TABLE (environ_table));
gimp_environ_table_clear_envp (environ_table);
gimp_environ_table_clear_vars (environ_table);
}
void
gimp_environ_table_clear_all (GimpEnvironTable *environ_table)
{
g_return_if_fail (GIMP_IS_ENVIRON_TABLE (environ_table));
gimp_environ_table_clear_envp (environ_table);
gimp_environ_table_clear_vars (environ_table);
gimp_environ_table_clear_internal (environ_table);
}
gchar **
gimp_environ_table_get_envp (GimpEnvironTable *environ_table)
{
g_return_val_if_fail (GIMP_IS_ENVIRON_TABLE (environ_table), NULL);
/* Hmm.. should we return a copy here in the future? Not thread safe atm,
* but the rest of it isn't either.
*/
if (! environ_table->envp)
gimp_environ_table_populate (environ_table);
return environ_table->envp;
}
/* private */
static void
gimp_environ_table_load_env_file (const GimpDatafileData *file_data,
gpointer user_data)
{
GimpEnvironTable *environ_table = GIMP_ENVIRON_TABLE (user_data);
FILE *env;
gchar buffer[4096];
gsize len;
gchar *name, *value, *separator, *p, *q;
GimpEnvironValue *val;
env = g_fopen (file_data->filename, "r");
if (! env)
return;
while (fgets (buffer, sizeof (buffer), env))
{
/* Skip comments */
if (buffer[0] == '#')
continue;
len = strlen (buffer) - 1;
/* Skip too long lines */
if (buffer[len] != '\n')
continue;
buffer[len] = '\0';
p = strchr (buffer, '=');
if (! p)
continue;
*p = '\0';
name = buffer;
value = p + 1;
if (name[0] == '\0')
{
g_message (_("Empty variable name in environment file %s"),
gimp_filename_to_utf8 (file_data->filename));
continue;
}
separator = NULL;
q = strchr (name, ' ');
if (q)
{
*q = '\0';
separator = name;
name = q + 1;
}
if (! gimp_environ_table_legal_name (name))
{
g_message (_("Illegal variable name in environment file %s: %s"),
gimp_filename_to_utf8 (file_data->filename), name);
continue;
}
if (! g_hash_table_lookup (environ_table->vars, name))
{
val = g_new (GimpEnvironValue, 1);
val->value = gimp_config_path_expand (value, FALSE, NULL);
val->separator = g_strdup (separator);
g_hash_table_insert (environ_table->vars, g_strdup (name), val);
}
}
fclose (env);
}
static gboolean
gimp_environ_table_legal_name (gchar *name)
{
gchar *s;
if (! g_ascii_isalpha (*name) && (*name != '_'))
return FALSE;
for (s = name + 1; *s; s++)
if (! g_ascii_isalnum (*s) && (*s != '_'))
return FALSE;
return TRUE;
}
static void
gimp_environ_table_populate (GimpEnvironTable *environ_table)
{
gchar **var = environ;
gchar *name, *p;
GPtrArray *env_array;
env_array = g_ptr_array_new ();
while (*var)
{
p = strchr (*var, '=');
/* shouldn't happen... but just to be safe... */
if (p)
{
name = g_strndup (*var, p - *var);
if (gimp_environ_table_pass_through (environ_table, name))
g_ptr_array_add (env_array, g_strdup (*var));
g_free (name);
}
var++;
}
if (environ_table->vars)
g_hash_table_foreach (environ_table->vars,
(GHFunc) gimp_environ_table_populate_one,
env_array);
if (environ_table->internal)
g_hash_table_foreach (environ_table->internal,
(GHFunc) gimp_environ_table_populate_one,
env_array);
g_ptr_array_add (env_array, NULL);
environ_table->envp = (gchar **) g_ptr_array_free (env_array, FALSE);
#ifdef ENVP_DEBUG
var = environ_table->envp;
g_print ("GimpEnvironTable:\n");
while (*var)
{
g_print ("%s\n", *var);
var++;
}
#endif /* ENVP_DEBUG */
}
static void
gimp_environ_table_populate_one (const gchar *name,
GimpEnvironValue *val,
GPtrArray *env_array)
{
gchar *old, *var = NULL;
if (val->separator)
{
old = getenv (name);
if (old)
var = g_strconcat (name, "=", val->value, val->separator, old, NULL);
}
if (! var)
var = g_strconcat (name, "=", val->value, NULL);
g_ptr_array_add (env_array, var);
}
static gboolean
gimp_environ_table_pass_through (GimpEnvironTable *environ_table,
const gchar *name)
{
gboolean vars, internal;
vars = environ_table->vars &&
g_hash_table_lookup (environ_table->vars, name);
internal = environ_table->internal &&
g_hash_table_lookup (environ_table->internal, name);
return (!vars && !internal);
}
static void
gimp_environ_table_clear_vars (GimpEnvironTable *environ_table)
{
if (environ_table->vars)
{
g_hash_table_destroy (environ_table->vars);
environ_table->vars = NULL;
}
}
static void
gimp_environ_table_clear_internal (GimpEnvironTable *environ_table)
{
if (environ_table->internal)
{
g_hash_table_destroy (environ_table->internal);
environ_table->internal = NULL;
}
}
static void
gimp_environ_table_clear_envp (GimpEnvironTable *environ_table)
{
if (environ_table->envp)
{
g_strfreev (environ_table->envp);
environ_table->envp = NULL;
}
}
static void
gimp_environ_table_free_value (gpointer value)
{
GimpEnvironValue *val = value;
g_free (val->value);
g_free (val->separator);
g_free (val);
}
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