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builtin-gconf.c
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builtin-gconf.c
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/* ------------------------------------------------------------------------- *
* Copyright (C) 2012 Jolla Ltd.
* Contact: Simo Piiroinen <simo.piiroinen@jollamobile.com>
* License: LGPLv2
* ------------------------------------------------------------------------- */
/* ------------------------------------------------------------------------- *
* NOTE: This module implements just enough of the GConf API to allow us
* to detach mce from D-Bus session bus. By no means is this even meant
* to be a complete GConf replacement.
*
* CAVEATS include *at least*:
* - the keys have no hierarchy
* - anything related to directories is simply ignored
* - gconf_client_get() returns the real thing, not deep copied duplicate
* - pair values are not supported
* - adding new values is not supported
* - value types can't be changed
* ------------------------------------------------------------------------- */
#include <glib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glob.h>
#include <errno.h>
#include "mce-log.h"
#include "mce-io.h"
/* ========================================================================= *
*
* CONFIGURATION
*
* ========================================================================= */
/** Provide additional values for type testing purposes */
#define GCONF_ADD_DEBUG_VALUES 0
/** Enable error logging to stderr via gconf_log_error() */
#define GCONF_ENABLE_ERROR_LOGGING 01
/** Enable debug logging to stderr via gconf_log_debug() */
#define GCONF_ENABLE_DEBUG_LOGGING 01
/** Path to persistent storage file */
#define VALUES_PATH G_STRINGIFY(MCE_VAR_DIR)"/builtin-gconf.values"
/* ========================================================================= *
*
* MACROS
*
* ========================================================================= */
/** Tag unused parameters as such to avoid compilation warnings */
#define unused(variable) (void)&variable
/* ========================================================================= *
*
* TYPES
*
* ========================================================================= */
typedef enum
{
GCONF_ERROR_SUCCESS = 0,
GCONF_ERROR_FAILED = 1,
GCONF_ERROR_NO_SERVER = 2,
GCONF_ERROR_NO_PERMISSION = 3,
GCONF_ERROR_BAD_ADDRESS = 4,
GCONF_ERROR_BAD_KEY = 5,
GCONF_ERROR_PARSE_ERROR = 6,
GCONF_ERROR_CORRUPT = 7,
GCONF_ERROR_TYPE_MISMATCH = 8,
GCONF_ERROR_IS_DIR = 9,
GCONF_ERROR_IS_KEY = 10,
GCONF_ERROR_OVERRIDDEN = 11,
GCONF_ERROR_OAF_ERROR = 12,
GCONF_ERROR_LOCAL_ENGINE = 13,
GCONF_ERROR_LOCK_FAILED = 14,
GCONF_ERROR_NO_WRITABLE_DATABASE = 15,
GCONF_ERROR_IN_SHUTDOWN = 16,
} GConfError;
typedef enum
{
GCONF_VALUE_INVALID,
GCONF_VALUE_STRING,
GCONF_VALUE_INT,
GCONF_VALUE_FLOAT,
GCONF_VALUE_BOOL,
GCONF_VALUE_SCHEMA,
GCONF_VALUE_LIST,
GCONF_VALUE_PAIR
} GConfValueType;
typedef struct GConfValue
{
// public
GConfValueType type;
// private
int refcount;
union {
gboolean b;
gint i;
char *s;
double f;
} data;
GConfValueType list_type;
GSList *list_head;
} GConfValue;
typedef struct GConfEntry
{
// public
char *key;
GConfValue *value;
// private
char *def;
} GConfEntry;
typedef struct GConfClient
{
// public
// (nothing)
// private
GSList *entries;
GSList *notify_list;
} GConfClient;
typedef enum
{
GCONF_CLIENT_PRELOAD_NONE,
GCONF_CLIENT_PRELOAD_ONELEVEL,
GCONF_CLIENT_PRELOAD_RECURSIVE
} GConfClientPreloadType;
typedef void (*GConfClientNotifyFunc)(GConfClient *client,
guint cnxn_id,
GConfEntry *entry,
gpointer user_data);
typedef struct GConfClientNotify
{
guint id;
gchar *namespace_section;
GConfClientNotifyFunc func;
gpointer user_data;
GFreeFunc destroy_notify;
} GConfClientNotify;
/* ========================================================================= *
*
* FUNCTION PROTOTYPES
*
* ========================================================================= */
static GQuark gconf_error_quark(void);
static void gconf_set_error(GError **err, gint code, const gchar *fmt, ...);
static char *gconf_strip_string(char *str);
static int gconf_parse_int(const char *str);
static double gconf_parse_float(const char *str);
static gboolean gconf_parse_bool(const char *str);
static GConfValueType gconf_parse_type(int chr);
static const char *gconf_type_repr(GConfValueType type);
static gboolean gconf_require_type(const char *key, const GConfValue *value, GConfValueType type, GError **err);
static gboolean gconf_require_list_type(const char *key, const GConfValue *value, GConfValueType type, GError **err);
gchar *gconf_concat_dir_and_key(const gchar *dir, const gchar *key);
#if GCONF_ENABLE_DEBUG_LOGGING
static char *gconf_value_repr(const char *key, GConfValue *self);
#endif
static char *gconf_value_str(GConfValue *self);
static void gconf_value_unset(GConfValue *self);
static gboolean gconf_value_list_validata(GSList *src, GConfValueType type);
static GSList *gconf_value_list_copy(GSList *src);
static GSList *gconf_value_list_free(GSList *list);
static void gconf_value_set_from_string(GConfValue *self, const char *data);
static GConfValue *gconf_value_init(GConfValueType type, GConfValueType list_type, const char *data);
GConfValue *gconf_value_copy(const GConfValue *src);
GConfValue *gconf_value_new(GConfValueType type);
void gconf_value_free(GConfValue *self);
gboolean gconf_value_get_bool(const GConfValue *self);
void gconf_value_set_bool(GConfValue *self, gboolean val);
int gconf_value_get_int(const GConfValue *self);
void gconf_value_set_int(GConfValue *self, gint val);
double gconf_value_get_float(const GConfValue *self);
void gconf_value_set_float(GConfValue *self, double val);
const char *gconf_value_get_string(const GConfValue *self);
void gconf_value_set_string(GConfValue *self, const char *val);
GConfValueType gconf_value_get_list_type(const GConfValue *self);
void gconf_value_set_list_type(GConfValue *self, GConfValueType list_type);
GSList *gconf_value_get_list(const GConfValue *self);
void gconf_value_set_list(GConfValue *self, GSList *list);
static GConfEntry *gconf_entry_init(const char *key, const char *type, const char *data);
const char *gconf_entry_get_key(const GConfEntry *entry);
GConfValue *gconf_entry_get_value(const GConfEntry *entry);
#if GCONF_ENABLE_DEBUG_LOGGING
static void gconf_client_debug(GConfClient *self);
#endif
GConfClient *gconf_client_get_default(void);
void gconf_client_add_dir(GConfClient *client, const gchar *dir, GConfClientPreloadType preload, GError **err);
static GConfEntry *gconf_client_find_entry(GConfClient *self, const gchar *key, GError **err);
static GConfValue *gconf_client_find_value(GConfClient *self, const gchar *key, GError **err);
GConfValue *gconf_client_get(GConfClient *self, const gchar *key, GError **err);
static void gconf_client_notify_free(GConfClientNotify *self);
static GConfClientNotify *gconf_client_notify_new(const gchar *namespace_section, GConfClientNotifyFunc func, gpointer user_data, GFreeFunc destroy_notify);
static void gconf_client_notify_change(GConfClient *client, const gchar *namespace_section);
guint gconf_client_notify_add(GConfClient *client, const gchar *namespace_section, GConfClientNotifyFunc func, gpointer user_data, GFreeFunc destroy_notify, GError **err);
void gconf_client_notify_remove(GConfClient *client, guint cnxn);
gboolean gconf_client_set_bool(GConfClient *client, const gchar *key, gboolean val, GError **err);
gboolean gconf_client_set_int(GConfClient *client, const gchar *key, gint val, GError **err);
gboolean gconf_client_set_float(GConfClient *client, const gchar *key, double val, GError **err);
gboolean gconf_client_set_string(GConfClient *client, const gchar *key, const gchar *val, GError **err);
gboolean gconf_client_set_list(GConfClient *client, const gchar *key, GConfValueType list_type, GSList *list, GError **err);
void gconf_client_suggest_sync(GConfClient *client, GError **err);
/* ========================================================================= *
*
* ERRORS & LOGGING
*
* ========================================================================= */
/** Our custom error quark */
static
GQuark
gconf_error_quark (void)
{
return g_quark_from_static_string ("gconf-setting-error-quark");
}
#define GCONF_ERROR gconf_error_quark()
/** Error logging function */
#if GCONF_ENABLE_ERROR_LOGGING
# define gconf_log_error(FMT, ARG...) mce_log_file(LL_WARN, __FILE__, __FUNCTION__, FMT , ##ARG)
#else
# define gconf_log_error(FMT, ARG...) do{}while(0)
#endif
/** Debug logging function */
#if GCONF_ENABLE_DEBUG_LOGGING
# define gconf_log_debug_p() mce_log_p(LL_DEBUG)
# define gconf_log_debug(FMT, ARG...) mce_log_file(LL_DEBUG, __FILE__, __FUNCTION__, FMT , ##ARG)
#else
# define gconf_log_debug_p() 0
# define gconf_log_debug(FMT, ARG...) do{}while(0)
#endif
/** Set GError helper */
static
void
gconf_set_error(GError **err, gint code, const gchar *fmt, ...)
__attribute__((format(printf, 3, 4)));
static
void
gconf_set_error(GError **err, gint code, const gchar *fmt, ...)
{
char *msg = 0;
va_list va;
va_start(va, fmt);
if( vasprintf(&msg, fmt, va) < 0 )
{
msg = 0;
}
va_end(va);
/* Assume caller will report error in appropriate context,
* log from builtin-gconf only in debug verbosity level */
mce_log(LL_DEBUG, "%s", msg ?: "unknown");
g_set_error_literal(err, GCONF_ERROR, code, msg ?: "unknown");
free(msg);
}
/* ========================================================================= *
*
* STRING PARSING
*
* ========================================================================= */
/** ASCII white character predicate */
static inline gboolean gconf_white_p(int c)
{
return (c > 0) && (c <= 32);
}
/** ASCII non-white character predicate */
static inline gboolean gconf_black_p(int c)
{
return (c < 0) || (c > 32);
}
/** Strip excess whitespace from string */
static char *gconf_strip_string(char *str)
{
if( str )
{
char *s = str;
char *d = str;
while( gconf_white_p(*s) ) ++s;
for( ;; )
{
while( gconf_black_p(*s) ) *d++ = *s++;
while( gconf_white_p(*s) ) ++s;
if( !*s ) break;
*d++ = ' ';
}
*d = 0;
}
return str;
}
/** Array of strings we accept as: boolean true */
static const char * const gconf_true_lut[] = { "true", "t", "yes", "y", 0 };
/** Array of strings we accept as: boolean false */
static const char * const gconf_false_lut[] = { "false", "f", "no", "n", 0 };
/** String to int helper */
static int gconf_parse_int(const char *str)
{
char *end = 0;
int res = strtol(str, &end, 0);
if( (end <= str) || *end )
{
gconf_log_error("'%s': is not fully qualified integer", str);
}
return res;
}
/** String to double helper */
static double gconf_parse_float(const char *str)
{
char *end = 0;
double res = strtod(str, &end);
if( (end <= str) || *end )
{
gconf_log_error("'%s': is not fully qualified float", str);
}
return res;
}
/** String to bool helper */
static gboolean gconf_parse_bool(const char *str)
{
for( size_t i = 0; gconf_true_lut[i]; ++i )
{
if( !strcmp(gconf_true_lut[i], str) ) return TRUE;
}
for( size_t i = 0; gconf_false_lut[i]; ++i )
{
if( !strcmp(gconf_false_lut[i], str) ) return FALSE;
}
int res = gconf_parse_int(str);
if( res < 0 || res > 1 )
{
gconf_log_error("'%s': is not fully qualified bool", str);
}
return res;
}
/** Char to GConfValueType helper */
static GConfValueType gconf_parse_type(int chr)
{
GConfValueType res = GCONF_VALUE_INVALID;
switch( chr )
{
case 'b': res = GCONF_VALUE_BOOL; break;
case 'i': res = GCONF_VALUE_INT; break;
case 'f': res = GCONF_VALUE_FLOAT; break;
case 's': res = GCONF_VALUE_STRING; break;
case 'a': res = GCONF_VALUE_LIST; break;
default:
gconf_log_error("unknown type '%c'", chr);
break;
}
return res;
}
/* ========================================================================= *
*
* MISCELLANEOUS
*
* ========================================================================= */
#if GCONF_ENABLE_DEBUG_LOGGING
/** Boolean to text helper */
static
const char *
gconf_bool_repr(gboolean value)
{
return value ? *gconf_true_lut : *gconf_false_lut;
}
#endif
/** GConfValueType to text helper */
static
const char *
gconf_type_repr(GConfValueType type)
{
const char *res = "unknown";
switch( type )
{
case GCONF_VALUE_INVALID: res = "invalid"; break;
case GCONF_VALUE_STRING: res = "string"; break;
case GCONF_VALUE_INT: res = "int"; break;
case GCONF_VALUE_FLOAT: res = "float"; break;
case GCONF_VALUE_BOOL: res = "bool"; break;
case GCONF_VALUE_SCHEMA: res = "schema"; break;
case GCONF_VALUE_LIST: res = "list"; break;
case GCONF_VALUE_PAIR: res = "pair"; break;
default: break;
}
return res;
}
/** Type checking helper */
static
gboolean
gconf_require_type(const char *key, const GConfValue *value,
GConfValueType type, GError **err)
{
if( value->type == type )
{
return TRUE;
}
gconf_set_error(err, GCONF_ERROR_TYPE_MISMATCH, "%s: is %s, not %s",
key, gconf_type_repr(value->type), gconf_type_repr(type));
return FALSE;
}
/** List type checking helper */
static
gboolean
gconf_require_list_type(const char *key, const GConfValue *value,
GConfValueType type, GError **err)
{
if( !gconf_require_type(key, value, GCONF_VALUE_LIST, err) )
{
return FALSE;
}
if( value->list_type == type )
{
return TRUE;
}
gconf_set_error(err, GCONF_ERROR_TYPE_MISMATCH,
"%s: is %s list, not %s list", key,
gconf_type_repr(value->list_type), gconf_type_repr(type));
return FALSE;
}
/** See GConf API documentation */
gchar *
gconf_concat_dir_and_key(const gchar *dir,
const gchar *key)
{
gchar *res = g_strconcat(dir ?: "", "/", key ?: "", NULL);
if( res != 0 )
{
gchar *s = res;
gchar *d = res;
while( *s )
{
/* copy other than '/' verbatim */
if( *s != '/' )
{
*d++ = *s++;
continue;
}
/* compress '///' into '/' */
while( *++s == '/' ) {}
*d++ = '/';
}
/* terminate */
*d = 0;
}
return res;
}
/* ========================================================================= *
*
* GConfValue
*
* ========================================================================= */
#if GCONF_ENABLE_DEBUG_LOGGING
/** GConfValue to text helper
*
* The result is for human readable for debugging purposes
*/
static
char *
gconf_value_repr(const char *key, GConfValue *self)
{
char *data = 0;
size_t size = 0;
FILE *file = 0;
if( !(file = open_memstream(&data, &size)) )
{
goto cleanup;
}
fprintf(file, "'%s' %s", key, gconf_type_repr(self->type));
switch( self->type )
{
case GCONF_VALUE_STRING:
fprintf(file, " '%s'", self->data.s);
break;
case GCONF_VALUE_INT:
fprintf(file, " %d", self->data.i);
break;
case GCONF_VALUE_FLOAT:
fprintf(file, " %g", self->data.f);
break;
case GCONF_VALUE_BOOL:
fprintf(file, " %s", gconf_bool_repr(self->data.b));
break;
case GCONF_VALUE_SCHEMA:
fprintf(file, " %g", self->data.f);
break;
case GCONF_VALUE_LIST:
fprintf(file, " of %s [", gconf_type_repr(self->list_type));
for( GSList *v_iter = self->list_head; v_iter; v_iter = v_iter->next )
{
switch( (self = v_iter->data)->type )
{
case GCONF_VALUE_STRING:
fprintf(file, " '%s'", self->data.s);
break;
case GCONF_VALUE_INT:
fprintf(file, " %d", self->data.i);
break;
case GCONF_VALUE_FLOAT:
fprintf(file, " %g", self->data.f);
break;
case GCONF_VALUE_BOOL:
fprintf(file, " %s", gconf_bool_repr(self->data.b));
break;
default:
fprintf(file, " ???");
break;
}
}
fprintf(file, " ]");
break;
case GCONF_VALUE_PAIR:
fprintf(file, "pair (");
fprintf(file, " )");
break;
case GCONF_VALUE_INVALID:
default:
break;
}
cleanup:
if( file ) fclose(file);
return data;
}
#endif
/** GConfValue to text helper
*
* The result is compatible with gconf_value_set_from_string()
*/
static
char *
gconf_value_str(GConfValue *self)
{
char *data = 0;
size_t size = 0;
FILE *file = 0;
if( !(file = open_memstream(&data, &size)) )
{
goto cleanup;
}
switch( self->type )
{
case GCONF_VALUE_STRING:
fprintf(file, "%s", self->data.s);
break;
case GCONF_VALUE_INT:
fprintf(file, "%d", self->data.i);
break;
case GCONF_VALUE_FLOAT:
fprintf(file, "%g", self->data.f);
break;
case GCONF_VALUE_BOOL:
fprintf(file, "%s", gconf_bool_repr(self->data.b));
break;
case GCONF_VALUE_SCHEMA:
fprintf(file, "%g", self->data.f);
break;
case GCONF_VALUE_LIST:
for( GSList *v_iter = self->list_head; v_iter; v_iter = v_iter->next )
{
switch( (self = v_iter->data)->type )
{
case GCONF_VALUE_STRING:
fprintf(file, "%s", self->data.s);
break;
case GCONF_VALUE_INT:
fprintf(file, "%d", self->data.i);
break;
case GCONF_VALUE_FLOAT:
fprintf(file, "%g", self->data.f);
break;
case GCONF_VALUE_BOOL:
fprintf(file, "%s", gconf_bool_repr(self->data.b));
break;
default:
fprintf(file, "???");
break;
}
if( v_iter->next ) {
fprintf(file, ",");
}
}
break;
case GCONF_VALUE_PAIR:
fprintf(file, "???");
break;
case GCONF_VALUE_INVALID:
default:
break;
}
cleanup:
if( file ) fclose(file);
return data;
}
/** Release dynamic resources of value, but not the value itself */
static
void
gconf_value_unset(GConfValue *self)
{
// clear the list of values
for( GSList *elem = self->list_head; elem; elem = elem->next )
{
gconf_value_free(elem->data);
}
g_slist_free(self->list_head), self->list_head = 0;
// free any dynamically allocated data
switch( self->type )
{
case GCONF_VALUE_STRING:
free(self->data.s), self->data.s = 0;
break;
default:
break;
}
}
/** Helper for type checking a list of values */
static
gboolean
gconf_value_list_validata(GSList *src, GConfValueType type)
{
for( ; src; src = src->next )
{
GConfValue *val = src->data;
if( !val )
{
gconf_log_error("list has NULL value");
return FALSE;
}
if( val->type != type )
{
gconf_log_error("list has %s value, expected %s\n",
gconf_type_repr(val->type), gconf_type_repr(type));
return FALSE;
}
}
return TRUE;
}
/** Helper for deep copying list of values */
static
GSList *
gconf_value_list_copy(GSList *src)
{
GSList *res = 0;
for( ; src; src = src->next )
{
res = g_slist_prepend(res, gconf_value_copy(src->data));
}
res = g_slist_reverse(res);
return res;
}
/** Helper for recursively releasing a list of values */
static
GSList *
gconf_value_list_free(GSList *list)
{
g_slist_free_full(list, (GDestroyNotify)gconf_value_free);
return 0;
}
/** Parse value content from text */
static void gconf_value_set_from_string(GConfValue *self, const char *data)
{
char *now, *zen, *tmp = 0;
switch( self->type )
{
case GCONF_VALUE_BOOL:
self->data.b = gconf_parse_bool(data);
break;
case GCONF_VALUE_INT:
self->data.i = gconf_parse_int(data);
break;
case GCONF_VALUE_FLOAT:
self->data.f = gconf_parse_float(data);
break;
case GCONF_VALUE_STRING:
self->data.s = strdup(data);
break;
case GCONF_VALUE_LIST:
switch( self->list_type )
{
case GCONF_VALUE_BOOL:
case GCONF_VALUE_INT:
case GCONF_VALUE_FLOAT:
case GCONF_VALUE_STRING:
break;
default:
self->list_type = GCONF_VALUE_INVALID;
self->type = GCONF_VALUE_INVALID;
goto cleanup;
}
self->list_head = gconf_value_list_free(self->list_head);
for( now = tmp = strdup(data); now; now = zen )
{
if( (zen = strchr(now, ',')) )
{
*zen++ = 0;
}
GConfValue *elem = gconf_value_init(self->list_type,
GCONF_VALUE_INVALID,
gconf_strip_string(now));
self->list_head = g_slist_prepend(self->list_head, elem);
}
self->list_head = g_slist_reverse(self->list_head);
break;
default:
self->list_type = GCONF_VALUE_INVALID;
self->type = GCONF_VALUE_INVALID;
break;
}
cleanup:
free(tmp);
}
/** Create and initialize a GConfValue */
static
GConfValue *
gconf_value_init(GConfValueType type, GConfValueType list_type,
const char *data)
{
GConfValue *self = calloc(1, sizeof *self);
self->refcount = 1;
self->list_type = GCONF_VALUE_INVALID;
self->type = type;
if( self->type == GCONF_VALUE_LIST )
{
self->list_type = list_type;
}
if( data != 0 )
{
gconf_value_set_from_string(self, data);
}
return self;
}
/** See GConf API documentation */
GConfValue *
gconf_value_copy(const GConfValue *src)
{
GConfValue *self = gconf_value_init(src->type, src->list_type, 0);
if( self->type != src->type || self->list_type != src->list_type )
{
goto cleanup;
}
switch( self->type )
{
case GCONF_VALUE_BOOL:
self->data.b = src->data.b;
break;
case GCONF_VALUE_INT:
self->data.i = src->data.i;
break;
case GCONF_VALUE_FLOAT:
self->data.f = src->data.f;
break;
case GCONF_VALUE_STRING:
self->data.s = src->data.s ? strdup(src->data.s) : 0;
break;
case GCONF_VALUE_LIST:
self->list_head = gconf_value_list_copy(src->list_head);
break;
default:
self->list_type = GCONF_VALUE_INVALID;
self->type = GCONF_VALUE_INVALID;
break;
}
cleanup:
return self;
}
/** See GConf API documentation */
GConfValue *
gconf_value_new(GConfValueType type)
{
return gconf_value_init(type, GCONF_VALUE_INVALID, 0);
}
/** See GConf API documentation */
void
gconf_value_free(GConfValue *self)
{
if( self != 0 && --self->refcount == 0 )
{
/* get rid of dynamically allocated resources */
gconf_value_unset(self);
/* mark the value as invalid to ease stale pointer debugging */
self->type = GCONF_VALUE_INVALID;
self->list_type = GCONF_VALUE_INVALID;
/* free the value itself too */
free(self);
}
}
/** See GConf API documentation */
gboolean
gconf_value_get_bool(const GConfValue *self)
{
return (self->type == GCONF_VALUE_BOOL) ? self->data.b : 0;
}
/** See GConf API documentation */
void
gconf_value_set_bool(GConfValue *self, gboolean val)
{
if( self->type == GCONF_VALUE_BOOL )
{
self->data.b = val;
}
else
{
gconf_log_error("not a bool value");
}
}
/** See GConf API documentation */
int
gconf_value_get_int(const GConfValue *self)
{
return (self->type == GCONF_VALUE_INT) ? self->data.i : 0;
}
/** See GConf API documentation */
void
gconf_value_set_int(GConfValue *self, gint val)
{
if( self->type == GCONF_VALUE_INT )
{
self->data.i = val;
}
else
{
gconf_log_error("not an int value");
}
}
/** See GConf API documentation */
double
gconf_value_get_float(const GConfValue *self)
{
return (self->type == GCONF_VALUE_FLOAT) ? self->data.f : 0;
}
/** See GConf API documentation */
void
gconf_value_set_float(GConfValue *self, double val)
{
if( self->type == GCONF_VALUE_FLOAT )
{
self->data.f = val;
}
else
{
gconf_log_error("not a float value");
}
}
/** See GConf API documentation */
const char *