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lasso/lasso/utils.h

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/* $Id$
*
* Lasso - A free implementation of the Liberty Alliance specifications.
*
* Copyright (C) 2004-2007 Entr'ouvert
* http://lasso.entrouvert.org
*
* Authors: See AUTHORS file in top-level directory.
*
* 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
*/
#ifndef __LASSO_UTILS_H__
#define __LASSO_UTILS_H__
#include <stdio.h>
#include <glib.h>
#include <glib-object.h>
#include "debug.h"
#include "./backward_comp.h"
#include "./xml/private.h"
#include "./xml/tools.h"
#include "./logging.h"
#ifdef LASSO_DEBUG
#ifdef __GNUC__
#define lasso_check_type_equality(a,b) \
{ \
enum { TYPE_MISMATCH = (1 / __builtin_types_compatible_p(typeof(a), typeof(b))) }; \
}
#else
#define lasso_check_type_equality(a,b)
#endif
#else
#define lasso_check_type_equality(a,b)
#endif
#ifdef __GNUC__
#define lasso_check_type_equality2(a,b,c) \
{ \
enum { TYPE_MISMATCH = (1 / (__builtin_types_compatible_p(typeof(a), typeof(b))+__builtin_types_compatible_p(typeof(a), typeof(c)))) }; \
}
#else
#define lasso_check_type_equality2(a,b,c)
#endif
#define lasso_private_data(object) ((object)->private_data)
/**
* lasso_ref:
* @object: an object whose reference count must be incremented.
*
* Increment the reference count of an object, do not emit warning if it is NULL.
*
* Return value: the @object.
*/
#define lasso_ref(object) ((object) != NULL ? (g_object_ref(object), object) : NULL)
/**
* lasso_unref:
* @object: an object whose reference count must be decremented.
*
* Decrement the reference count of an object, do not emit warnings if it is NULL.
*
* Return value: the @object.
*/
#define lasso_unref(object) ((object) != NULL ? (g_object_unref(object), object) : NULL)
/* Freeing */
/*
* lasso_release_xxx are macros which ensure you do not get 'double free' errors, they first check
* that the variable is not NULL before calling the deallocation function, and after deallocation
* they reset the variable to NULL, preventing 'double free'.
*/
#define lasso_release(dest) \
{ \
if (dest) { \
g_free(dest); dest = NULL; \
} \
}
#define lasso_release_full(dest, free_function) \
{ \
if (dest) { \
free_function(dest); dest = NULL; \
} \
}
#define lasso_release_full2(dest, free_function, type) \
{ \
lasso_check_type_equality(dest, type); \
if (dest) { \
free_function(dest); dest = NULL; \
} \
}
#define lasso_release_gobject(dest) \
{ \
if (G_IS_OBJECT(dest) || dest == NULL) { \
lasso_release_full(dest, g_object_unref); \
} else { \
message(G_LOG_LEVEL_CRITICAL, "Trying to unref a non GObject pointer file=%s:%u pointerbybname=%s pointer=%p", __FILE__, __LINE__, #dest, dest); \
} \
}
#define lasso_release_string(dest) \
lasso_release_full(dest, g_free)
#define lasso_release_list(dest) \
lasso_release_full2(dest, g_list_free, GList*)
#define lasso_release_list_of_full(dest, free_function) \
{ \
GList **__tmp = &(dest); \
if (*__tmp) { \
g_list_foreach(*__tmp, (GFunc)free_function, NULL); \
lasso_release_list(*__tmp); \
} \
}
#define lasso_release_list_of_strings(dest) \
lasso_release_list_of_full(dest, g_free)
#define lasso_release_list_of_gobjects(dest) \
lasso_release_list_of_full(dest, g_object_unref)
#define lasso_release_list_of_xml_node(dest) \
lasso_release_list_of_full(dest, xmlFreeNode)
#define lasso_release_list_of_xml_node_list(dest) \
lasso_release_list_of_full(dest, xmlFreeNodeList)
#define lasso_release_xml_node(node) \
lasso_release_full2(node, xmlFreeNode, xmlNodePtr)
#define lasso_release_xml_node_list(node) \
lasso_release_full2(node, xmlFreeNodeList, xmlNodePtr)
#define lasso_release_doc(doc) \
lasso_release_full2(doc, xmlFreeDoc, xmlDocPtr)
#define lasso_release_xml_string(dest) \
lasso_release_full2(dest, xmlFree, xmlChar*)
#define lasso_release_encrypt_context(dest) \
lasso_release_full2(dest, xmlSecEncCtxDestroy, xmlSecEncCtxPtr)
#define lasso_release_signature_context(dest) \
lasso_release_full2(dest, xmlSecDSigCtxDestroy,xmlSecDSigCtxPtr)
#define lasso_release_key_manager(dest) \
lasso_release_full2(dest, xmlSecKeysMngrDestroy, xmlSecKeysMngrPtr)
#define lasso_release_output_buffer(dest) \
lasso_release_full2(dest, xmlOutputBufferClose, xmlOutputBufferPtr)
#define lasso_release_xpath_object(dest) \
lasso_release_full2(dest, xmlXPathFreeObject, xmlXPathObjectPtr)
#define lasso_release_xpath_context(dest) \
lasso_release_full2(dest, xmlXPathFreeContext, xmlXPathContextPtr)
#define lasso_release_xpath_job(xpathObject, xpathContext, xmlDocument) \
lasso_release_xpath_object(xpathObject); \
lasso_release_xpath_context(xpathContext); \
lasso_release_doc(xmlDocument)
#define lasso_release_sec_key(dest) \
lasso_release_full2(dest, xmlSecKeyDestroy, xmlSecKeyPtr)
#define lasso_release_ghashtable(dest) \
lasso_release_full(dest, g_hash_table_destroy)
#define lasso_release_gstring(dest, b) \
{ \
GString **__tmp = &(dest); \
if (*__tmp) {\
g_string_free(*__tmp, (b)); \
*__tmp = NULL; \
} \
}
/* Assignment and list appending */
/*
* lasso_assign_xxx macros ensure that you dot leak previous value of assigned things, they use
* lasso_release_xxx macros to deallocate, they also ensure proper reference counting on passed by
* references values and proper copying on passed by value values.
*/
#define lasso_assign_string(dest,src) \
{ \
char *__tmp = g_strdup(src);\
lasso_release_string(dest); \
dest = __tmp; \
}
#define lasso_assign_xml_string(dest,src) \
{ \
xmlChar *__tmp = xmlStrdup(src); \
lasso_release_xml_string(dest); \
dest = __tmp; \
}
#define lasso_assign_new_string(dest,src) \
{ \
char *__tmp = src; \
if (dest != __tmp) \
lasso_release_string(dest); \
dest = __tmp; \
}
#define lasso_assign_gobject(dest,src) \
{ \
GObject *__tmp = G_OBJECT(src); \
if (__tmp) \
g_object_ref(__tmp); \
lasso_release_gobject(dest); \
dest = (void*)(__tmp); \
}
#define lasso_assign_new_gobject(dest,src) \
{ \
GObject *__tmp = G_OBJECT(src); \
if (dest != (void*)__tmp) \
lasso_release_gobject(dest); \
dest = (void*)(__tmp); \
}
#define lasso_assign_xml_node(dest,src) \
{ \
xmlNode *__tmp = (src); \
lasso_check_type_equality(dest, src); \
if (dest) \
xmlFreeNode(dest); \
dest = xmlCopyNode(__tmp, 1); \
}
#define lasso_assign_new_xml_node(dest,src) \
{ \
xmlNode *__tmp = (src); \
lasso_check_type_equality(dest, src); \
if (dest) \
xmlFreeNode(dest); \
dest = __tmp; \
}
#define lasso_assign_xml_node_list(dest,src) \
{ \
xmlNode *__tmp = (src); \
lasso_check_type_equality(dest, src); \
if (dest) \
xmlFreeNode(dest); \
dest = xmlCopyNodeList(__tmp); \
}
#define lasso_assign_new_xml_node_list(dest,src) \
lasso_assign_new_xml(dest, src)
#define lasso_assign_list(dest, src) \
{ \
GList **__tmp = &(dest); \
if (*__tmp) \
g_list_free(*__tmp); \
*__tmp = g_list_copy((src)); \
}
#define lasso_assign_new_list_of_gobjects(dest, src) \
{ \
GList *__tmp = (src); \
lasso_release_list_of_gobjects(dest); \
dest = (GList*)__tmp; \
}
#define lasso_assign_new_list_of_strings(dest, src) \
{ \
GList *__tmp = (src); \
lasso_release_list_of_strings(dest); \
dest = (GList*)__tmp; \
}
#define lasso_assign_new_list_of_xml_node(dest, src) \
{ \
GList *__tmp = (src); \
lasso_release_list_of_xml_node(dest); \
dest = (GList*)__tmp; \
}
#define lasso_assign_list_of_gobjects(dest, src) \
{ \
GList *__tmp = (src); \
lasso_release_list_of_gobjects(dest); \
dest = g_list_copy(__tmp); \
for (;__tmp != NULL; __tmp = g_list_next(__tmp)) { \
if (G_IS_OBJECT(__tmp->data)) { \
g_object_ref(__tmp->data); \
} \
} \
}
#define lasso_assign_list_of_strings(dest, src) \
{ \
GList *__tmp = src; \
GList *__iter_dest; \
lasso_release_list_of_strings(dest); \
dest = g_list_copy(__tmp); \
for (__iter_dest = dest ; __iter_dest != NULL ; __iter_dest = g_list_next(__iter_dest)) { \
__iter_dest->data = g_strdup(__iter_dest->data); \
} \
}
#define lasso_assign_new_sec_key(dest, src) \
{ \
xmlSecKey *__tmp = (src); \
if (dest) \
lasso_release_sec_key(dest); \
dest = __tmp; \
}
#define lasso_assign_sec_key(dest, src) \
{ \
xmlSecKey *__tmp = xmlSecKeyDup(src); \
if (dest) \
lasso_release_sec_key(dest); \
dest = __tmp; \
}
/* List appending */
/* lasso_list_add_xxx macros, simplify code around list manipulation (g_list_append needs to be
* used like this 'l = g_list_appen(l, value)' ) and ensure proper reference count or copying of
* values.
*/
#define lasso_list_add(dest, src) \
{ \
lasso_check_type_equality((src), void*); \
dest = g_list_append(dest, (src)); \
}
#define lasso_list_add_non_null(dest, src) \
{ \
void *__tmp_non_null_src = (src); \
if (__tmp_non_null_src != NULL) { \
dest = g_list_append(dest, __tmp_non_null_src); \
} else { \
message(G_LOG_LEVEL_CRITICAL, "Adding a NULL value to a non-NULL content list: dest=%s src=%s", #dest, #src); \
} \
}
#define lasso_list_add_string(dest, src) \
{ \
lasso_list_add_non_null(dest, g_strdup(src));\
}
#define lasso_list_add_new_string(dest, src) \
{ \
gchar *__tmp = src; \
lasso_list_add_non_null(dest, __tmp); \
}
#define lasso_list_add_xml_string(dest, src) \
{\
xmlChar *__tmp_src = (src);\
lasso_list_add_non_null(dest, (void*)g_strdup((char*)__tmp_src));\
}
#define lasso_list_add_gobject(dest, src) \
{ \
void *__tmp_src = (src); \
if (G_IS_OBJECT(__tmp_src)) { \
dest = g_list_append(dest, g_object_ref(__tmp_src)); \
} else { \
message(G_LOG_LEVEL_CRITICAL, "Trying to add to a GList* a non GObject pointer dest=%s src=%s", #dest, #src); \
} \
}
#define lasso_list_add_new_gobject(dest, src) \
{ \
void *__tmp_src = (src); \
if (G_IS_OBJECT(__tmp_src)) { \
dest = g_list_append(dest, __tmp_src); \
} else { \
message(G_LOG_LEVEL_CRITICAL, "Trying to add to a GList* a non GObject pointer dest=%s src=%s", #dest, #src); \
} \
}
#define lasso_list_add_xml_node(dest, src) \
{ \
xmlNode *__tmp_src = xmlCopyNode(src, 1); \
lasso_list_add_non_null(dest, __tmp_src); \
}
#define lasso_list_add_new_xml_node(dest, src) \
{ \
xmlNode *__tmp_src = src; \
lasso_list_add_non_null(dest, __tmp_src); \
}
#define lasso_list_add_xml_node_list(dest, src) \
{ \
xmlNode *__tmp_src = xmlCopyNodeList(src); \
lasso_list_add_non_null(dest, __tmp_src); \
}
#define lasso_list_add_new_xml_node_list(dest, src) \
lasso_list_add_new_xml_node(dest, src)
#define lasso_list_add_gstrv(dest, src) \
{ \
GList **__tmp_dest = &(dest); \
const char **__iter = (const char**)(src); \
while (__iter && *__iter) { \
lasso_list_add_string(*__tmp_dest, *__iter); \
} \
}
/* List element removal */
#define lasso_list_remove_gobject(list, gobject) \
do { void *__tmp = gobject; GList **__tmp_list = &(list); \
*__tmp_list = g_list_remove(*__tmp_list, __tmp); \
lasso_unref(__tmp); } while(0)
/* Pointer ownership transfer */
/* lasso_transfer_xxx macros are like lasso_assign_xxx but they do not increment reference count or
* copy the source value, instead they steal the value (and set the source to NULL, preventing stale
* references).
*/
#define lasso_transfer_full(dest, src, kind) \
{\
lasso_release_##kind((dest)); \
lasso_check_type_equality(dest, src); \
(dest) = (void*)(src); \
(src) = NULL; \
}
#define lasso_transfer_xpath_object(dest, src) \
lasso_transfer_full(dest, src, xpath_object)
#define lasso_transfer_string(dest, src) \
lasso_transfer_full(dest, src, string)
#define lasso_transfer_gobject(dest, src) \
lasso_transfer_full(dest, src, gobject)
/* Node extraction */
#define lasso_extract_node_or_fail(to, from, kind, error) \
{\
void *__tmp = (from); \
if (LASSO_IS_##kind(__tmp)) { \
to = LASSO_##kind(__tmp); \
} else { \
rc = error; \
goto cleanup; \
}\
}
/* Bad param handling */
#define lasso_return_val_if_invalid_param(kind, name, val) \
g_return_val_if_fail(LASSO_IS_##kind(name), val)
#define lasso_bad_param(kind, name) \
lasso_return_val_if_invalid_param(kind, name, \
LASSO_PARAM_ERROR_BAD_TYPE_OR_NULL_OBJ);
#define lasso_null_param(name) \
g_return_val_if_fail(name != NULL, LASSO_PARAM_ERROR_BAD_TYPE_OR_NULL_OBJ);
/**
* lasso_check_non_empty_string:
* @str: a char pointer
*
* Check that @str is non-NULL and not empty, otherwise jump to cleanup and return
* LASSO_PARAM_ERROR_BAD_TYPE_OR_NULL_OBJ.
*/
#define lasso_check_non_empty_string(str) \
goto_cleanup_if_fail_with_rc(! lasso_strisempty(str), \
LASSO_PARAM_ERROR_BAD_TYPE_OR_NULL_OBJ);
/*
* We extensively use goto operator but in a formalized way, i.e. only for error checking code
* paths.
*
* The next macros goto_cleanup_xxxx encapsulate idioms used in lasso, like checking for a condition
* or setting the return code which must be called 'rc' and be of an 'int' type.
*/
/*
* The following macros are made to create some formalism for function's cleanup code.
*
* The exit label should be called 'cleanup'. And for functions returning an integer error code, the
* error code should be named 'rc' and 'return rc;' should be the last statement of the function.
*/
/**
* goto_cleanup_with_rc:
* @rc_value: integer return value
*
* This macro jump to the 'cleanup' label and set the return value to @rc_value.
*
*/
#define goto_cleanup_with_rc(rc_value) \
do {\
rc = (rc_value); \
goto cleanup; \
} while(0);
/**
* goto_cleanup_if_fail:
* @condition: a boolean condition
*
* Jump to the 'cleanup' label if the @condition is FALSE.
*
*/
#define goto_cleanup_if_fail(condition) \
{\
if (! (condition) ) {\
goto cleanup; \
} \
}
/**
* goto_cleanup_if_fail_with_rc:
* @condition: a boolean condition
* @rc_value: integer return value
*
* Jump to the 'cleanup' label if the @condition is FALSE and set the return value to
* @rc_value.
*
*/
#define goto_cleanup_if_fail_with_rc(condition, rc_value) \
{\
if (! (condition) ) {\
rc = (rc_value); \
goto cleanup; \
} \
}
/**
* goto_cleanup_if_fail_with_rc_with_warning:
* @condition: a boolean condition
* @rc_value: integer return value
*
* Jump to the 'cleanup' label if the @condition is FALSE and set the return value to
* @rc_value. Also emit a warning, showing the condition and the return value.
*
*/
#define goto_cleanup_if_fail_with_rc_with_warning(condition, rc_value) \
{\
if (! (condition) ) {\
message(G_LOG_LEVEL_WARNING, "%s failed, returning %s", #condition, #rc_value);\
rc = (rc_value); \
goto cleanup; \
} \
}
/**
* check_good_rc:
* @what: a call to a function returning a lasso error code
*
* Check if return code is 0, if not store it in rc and jump to cleanup label.
*/
#define lasso_check_good_rc(what) \
{ \
int __rc = (what);\
goto_cleanup_if_fail_with_rc(__rc == 0, __rc); \
}
#define lasso_mem_debug(who, what, where) \
{ \
if (lasso_flag_memory_debug) \
fprintf(stderr, " freeing %s/%s (at %p)\n", who, what, (void*)where); \
}
/**
* lasso_foreach:
* @_iter: a #GList variable, which will server to traverse @_list
* @_list: a #GList value, which we will traverse
*
* Traverse a #GList list using 'for' construct. It must be followed by a block or a statement.
*/
#define lasso_foreach(_iter, _list) \
for (_iter = (_list); _iter; _iter = g_list_next(_iter))
/**
* lasso_foreach_full_begin:
* @_type: the type of the variable @_data
* @_data: the name of the variable to define to store data values
* @_iter: the name of the variable to define to store the iterator
* @_list: the GList* to iterate
*
* Traverse a GList* @_list, using @_iter as iteration variable extract data field to variable
* @_data of type @_type.
*/
#define lasso_foreach_full_begin(_type, _data, _iter, _list) \
{ \
_type _data = NULL; \
GList *_iter = NULL; \
for (_iter = (_list); _iter && ((_data = _iter->data), 1); _iter = g_list_next(_iter)) \
{
#define lasso_foreach_full_end() \
} }
/**
* lasso_list_get_first_child:
* @list:(allowed-none): a #GList node or NULL.
*
* Return the first child in a list, or NULL.
*/
#define lasso_list_get_first_child(list) \
((list) ? (list)->data : NULL)
/* Get a printable extract for error messages */
char* lasso_safe_prefix_string(const char *str, gsize length);
int lasso_gobject_is_of_type(GObject *a, GType b);
GObject *lasso_extract_gtype_from_list(GType type, GList *list);
GObject * lasso_extract_gtype_from_list_or_new(GType type, GList **list, gboolean create);
/* Get first node of this type in a list */
/* ex: lasso_extract_node (LassoNode, LASSO_TYPE_NODE, list) */
#define lasso_extract_gobject_from_list(type, gobjecttype, list) \
((type*) lasso_extract_gtype_from_list(gobjecttype, list))
/*
* Simplify simple accessors argument checking.
*
*/
#define lasso_return_val_if_fail(assertion, value) \
if (!(assertion)) return (value);
#define lasso_return_null_if_fail(assertion) \
lasso_return_val_if_fail(assertion, NULL)
#define lasso_return_if_fail(assertion) \
if (!(assertion)) return;
#define lasso_trace(args...) \
if (lasso_flag_memory_debug) { \
fprintf(stderr, ## args); \
}
/* Lasso string data helpers */
inline static gboolean
lasso_strisequal(const char *a, const char *b) {
return (g_strcmp0(a,b) == 0);
}
inline static gboolean
lasso_strisnotequal(const char *a, const char *b) {
return ! lasso_strisequal(a,b);
}
inline static gboolean
lasso_strisempty(const char *str) {
return ((str) == NULL || (str)[0] == '\0');
}
inline static gboolean
lasso_xmlstrisnotequal(const xmlChar *a, const xmlChar *b) {
return lasso_strisnotequal((char*)a, (char*)b);
}
#endif /* __LASSO_UTILS_H__ */
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