/usr/include/gwenhywfar4/gwenhywfar/list1.h is in libgwenhywfar-core-dev 4.15.3-5+b1.
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$RCSfile$
-------------------
cvs : $Id$
begin : Sat Jun 28 2003
copyright : (C) 2003 by Martin Preuss
email : martin@libchipcard.de
***************************************************************************
* *
* This library 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 2.1 of the License, or (at your option) any later version. *
* *
* This library 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 *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this library; if not, write to the Free Software *
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
* MA 02111-1307 USA *
* *
***************************************************************************/
#include <gwenhywfar/gwenhywfarapi.h>
#include <gwenhywfar/types.h>
#include <assert.h>
#ifndef GWEN_DUMMY_EMPTY_ARG
/** Necessary for MSVC compiler because it does not accept a left-out
macro argument. */
# define GWEN_DUMMY_EMPTY_ARG
#endif
#ifndef GWEN_LIST1_H
#define GWEN_LIST1_H
#ifdef __cplusplus
extern "C" {
#endif
/** @defgroup GWEN_MACRO_LIST Macros For Typesafe List Handling
*
* The macros of this group facilitates typesafe use of lists.
*
* <p>
* Let's assume you have a structure type called MYSTRUCT and you want
* to manage lists of them. Let's further assume that you want the
* functions dealing with that struct have prefixes like MyStruct (as in
* @b MyStruct_new)
* </p>
* The header file would look like this:
*
* @code
*
* / * mystruct.h * /
*
* #ifndef MYSTRUCT_H
* #define MYSTRUCT_H
*
* typedef struct MYSTRUCT MYSTRUCT;
*
* GWEN_LIST_FUNCTION_DEFS(MYSTRUCT, MyStruct);
*
* struct MYSTRUCT {
* GWEN_LIST_ELEMENT(MYSTRUCT);
* int myData;
* }
*
*
* MYSTRUCT *MyStruct_new(int myData);
* void MyStruct_free(MYSTRUCT *myStruct);
*
* #endif
* @endcode
* <p>
* This defines all necessary data and function prototypes needed for
* list management.
* </p>
*
* <p>
* The code file would look quite similar to the following:
* </p>
*
* @code
*
* / * mystruct.c * /
*
* GWEN_LIST_FUNCTIONS(MYSTRUCT, MyStruct)
*
* MYSTRUCT *MyStruct_new(int myData) {
* MYSTRUCT *pMyStruct;
*
* pMyStruct=(MYSTRUCT*)malloc(sizeof(MYSTRUCT));
* memset(pMyStruct, 0, sizeof(MYSTRUCT));
*
* GWEN_LIST_INIT(MYSTRUCT, pMyStruct)
*
* pMyStruct->myData=myData;
* return pMyStruct;
* }
*
* void MyStruct_free(MYSTRUCT *pMyStruct) {
* if (pMyStruct) {
* pMyStruct->myData=0;
*
* GWEN_LIST_FINI(MYSTRUCT, pMyStruct)
*
* free(pMyStruct);
* }
* }
*
* @endcode
* Please note the three macros used in the code file:
* <ul>
* <li>@ref GWEN_LIST_FUNCTIONS creates the functions for the list
* management</li>
* <li>@ref GWEN_LIST_INIT initializes the list data inside your
* struct to defined values </li>
* <li>@ref GWEN_LIST_FINI frees all ressources occupied by the list
* management code. Please note that this macro should be the last
* statement inside the destructor function before @b free()</li>
* </ul>
*
* <p>Note: When writing these macro code lines, the original ISO
* C89 standard for the C language does not allow terminating the
* macro statement with a semicolon ';'. Any recent compiler will
* probably silently ignore such an extra ';', but you should be
* aware that this can cause problems once one of your users tries
* to compile this with a different compiler. Therefore these code
* lines should end directly with the closing parentheses.</p>
*
* <p>
* The list management code assumes that there is a function called
* (in this example) @b MyStruct_free() (or generally: TYPEPREFIX_free).
* This is used when destroying a list of MYSTRUCT elements. In this case
* all elements still enlisted are destroyed upon destruction of the list.
* </p>
*/
/*@{*/
/** @name Internal Functions
*
* All functions and structs within this group should be considered
* internal. They just implement the functionality behind the typesafe list
* macros (see @ref GWEN_LIST_FUNCTION_LIB_DEFS and following).
*/
/*@{*/
typedef struct GWEN_LIST1 GWEN_LIST1;
typedef struct GWEN_LIST1_ELEMENT GWEN_LIST1_ELEMENT;
typedef int GWENHYWFAR_CB (*GWEN_LIST1_SORT_FN)(const void *a, const void *b, int ascending);
/** Allocate (create) a new empty list. */
GWENHYWFAR_API
GWEN_LIST1 *GWEN_List1_new(void);
/** Free (delete) an existing list. The list elements are
* untouched by this function; they need to be freed
* beforehand. */
GWENHYWFAR_API
void GWEN_List1_free(GWEN_LIST1 *l);
/** Returns the number of elements in this list. This value is
* cached in the list structure, so this function is a cheap
* function. */
GWENHYWFAR_API
int GWEN_List1_GetCount(const GWEN_LIST1 *l);
/** Adds (appends) a list element at the end of the list. (This
* operation is also called "append" or "push_back" elsewhere.) */
GWENHYWFAR_API
int GWEN_List1_Add(GWEN_LIST1 *l, GWEN_LIST1_ELEMENT *el);
/** Inserts (prepends) a list element at the beginning of the
* list. (This operation is also called "prepend" or "push_front"
* elsewhere.) */
GWENHYWFAR_API
int GWEN_List1_Insert(GWEN_LIST1 *l, GWEN_LIST1_ELEMENT *el);
/** Deletes (removes) a list element from the list it used to
* belong to. The list element is not free'd or anything, it is
* only removed from the list it used to belong to. (This
* operation is also called "remove" or "unlink" elsewhere.) */
GWENHYWFAR_API
int GWEN_List1_Del(GWEN_LIST1_ELEMENT *el);
/** Adds (appends) the second list to the end of the first
* list. (This operation is also called "append" or "concatenate"
* elsewhere.) */
GWENHYWFAR_API
int GWEN_List1_AddList(GWEN_LIST1 *dest, GWEN_LIST1 *l);
/** Returns the data pointer of the first list element. */
GWENHYWFAR_API
void *GWEN_List1_GetFirst(const GWEN_LIST1 *l);
/** Returns the data pointer of the last list element. */
GWENHYWFAR_API
void *GWEN_List1_GetLast(const GWEN_LIST1 *l);
GWENHYWFAR_API
GWEN_LIST1_SORT_FN GWEN_List1_SetSortFn(GWEN_LIST1 *l, GWEN_LIST1_SORT_FN fn);
GWENHYWFAR_API
void GWEN_List1_Sort(GWEN_LIST1 *l, int ascending);
/** Allocate (create) a new list element structure. */
GWENHYWFAR_API
GWEN_LIST1_ELEMENT *GWEN_List1Element_new(void *d);
/** Free (delete) a list element structure. */
GWENHYWFAR_API
void GWEN_List1Element_free(GWEN_LIST1_ELEMENT *el);
/** Returns the data pointer of the given list element
* structure. */
GWENHYWFAR_API
void *GWEN_List1Element_GetData(const GWEN_LIST1_ELEMENT *el);
/** Returns the data pointer of the list element that is the
* previous (predecessor) to the given one in its list. If there
* is no such prepending list element, returns NULL. */
GWENHYWFAR_API
void *GWEN_List1Element_GetPrevious(const GWEN_LIST1_ELEMENT *el);
/** Returns the data pointer of the list element that is the next
* one (successor) to the given one in its list. If there is no
* such prepending list element, returns NULL. */
GWENHYWFAR_API
void *GWEN_List1Element_GetNext(const GWEN_LIST1_ELEMENT *el);
/*@}*/
/** @name Typesafe Macros
*
*/
/*@{*/
/**
* Use this inside the declaration of a struct for which you want to create
* lists.
*/
#define GWEN_LIST_ELEMENT(t) \
GWEN_LIST1_ELEMENT *_list1_element;
/**
* Use this macro in your public header files to export only list functions
* which do not modify a list. This allows your code to return lists which can
* not be modified by callers. It also prevents callers from creating their
* own lists (this is sometimes needed).
*/
#define GWEN_LIST_FUNCTION_LIB_DEFS_CONST(t, pr, decl) \
typedef GWEN_LIST1 t##_LIST; \
typedef int GWENHYWFAR_CB (*t##_LIST_SORT_FN)(const t *a, const t *b, int ascending); \
\
\
decl t* pr##_List_First(const t##_LIST *l); \
decl t* pr##_List_Last(const t##_LIST *l); \
decl t* pr##_List_Next(const t *element); \
decl t* pr##_List_Previous(const t *element); \
decl uint32_t pr##_List_GetCount(const t##_LIST *l); \
decl int pr##_List_HasElement(const t##_LIST *l, const t *element); \
decl t##_LIST_SORT_FN pr##_List_SetSortFn(t##_LIST *l, t##_LIST_SORT_FN fn); \
decl void pr##_List_Sort(t##_LIST *l, int ascending);
#define GWEN_LIST_FUNCTION_LIB_DEFS_NOCONST(t, pr, decl) \
typedef GWEN_LIST1_ELEMENT t##_LIST_ELEMENT; \
\
decl void pr##_List_Clear(t##_LIST *l); \
decl t##_LIST* pr##_List_new(); \
decl void pr##_List_free(t##_LIST *l); \
decl int pr##_List_AddList(t##_LIST *dst, t##_LIST *l); \
decl int pr##_List_Add(t *element, t##_LIST *list); \
decl int pr##_List_Insert(t *element, t##_LIST *list); \
decl int pr##_List_Del(t *element); \
#define GWEN_LIST_FUNCTION_DEFS_CONST(t, pr) \
GWEN_LIST_FUNCTION_LIB_DEFS_CONST(t, pr, GWEN_DUMMY_EMPTY_ARG)
#define GWEN_LIST_FUNCTION_DEFS_NOCONST(t, pr) \
GWEN_LIST_FUNCTION_LIB_DEFS_NOCONST(t, pr, GWEN_DUMMY_EMPTY_ARG)
/**
* Use this in public header files to define some prototypes for list
* functions.
* Let's assume the type of your list elements is "MYTYPE" and you want to
* use the prefix "MyType_" for the list functions.
* The following function prototypes will then be created:
* <ul>
* <li>
* void MyType_List_Add(MYTYPE *element, MYTYPE_LIST *list);<br>
* Adds (appends) a MYTYPE struct at the end of the given
* list. (We apologize for the unusual argument order here.)
* </li>
* <li>
* void MyType_List_Del(MYTYPE *element);<br>
* Removes a MyType struct from the list it is enlisted to.
* </li>
* <li>
* MYTYPE *MyType_List_First(MYTYPE *element); <br>
* Returns the first element of the given list.
* </li>
* <li>
* MYTYPE* MyType_List_Next(const MYTYPE *element);<br>
* Returns the next list element to the given one (the
* successor) in its list.
* </li>
* <li>
* MYTYPE* MyType_List_Previous(const MYTYPE *element);<br>
* Returns the previous list element to the given one (the
* predecessor) in its list.
* </li>
* <li>
* void MyType_List_Clear(MYTYPE *element); <br>
* Frees all entries of the given list.
* This function assumes that there is a function Mytype_free().
* </li>
* <li>
* MYTYPE_LIST *MyType_List_new(); <br>
* Creates a new list of elements of MYTYPE type.
* </li>
* <li>
* void MyType_List_free(MYTYPE_LIST *l); <br>
* Clears and frees a list of elements of MYTYPE type.
* All objects inside the list are freed.
* This function assumes that there is a function Mytype_free().
* </li>
* </ul>
*
*/
#define GWEN_LIST_FUNCTION_LIB_DEFS(t, pr, decl) \
GWEN_LIST_FUNCTION_LIB_DEFS_CONST(t, pr, decl) \
GWEN_LIST_FUNCTION_LIB_DEFS_NOCONST(t, pr, decl)
/**
* This macro should be used in applications, not in libraries. In
* libraries please use the macro @ref GWEN_LIST_FUNCTION_LIB_DEFS.
*/
#define GWEN_LIST_FUNCTION_DEFS(t, pr) \
GWEN_LIST_FUNCTION_LIB_DEFS(t, pr, GWEN_DUMMY_EMPTY_ARG)
/**
* Use this inside your code files (*.c).
* Actually implements the functions for which the prototypes have been
* defined via @ref GWEN_LIST_FUNCTION_DEFS.
*/
#define GWEN_LIST_FUNCTIONS(t, pr) \
\
int pr##_List_Add(t *element, t##_LIST *l) { \
return GWEN_List1_Add(l, element->_list1_element); \
} \
\
int pr##_List_AddList(t##_LIST *dst, t##_LIST *l) { \
return GWEN_List1_AddList(dst, l); \
} \
\
int pr##_List_Insert(t *element, t##_LIST *l) { \
return GWEN_List1_Insert(l, element->_list1_element); \
} \
\
int pr##_List_Del(t *element){ \
return GWEN_List1_Del(element->_list1_element); \
}\
\
t* pr##_List_First(const t##_LIST *l) { \
if (l) return (t*)GWEN_List1_GetFirst(l);\
else return 0; \
} \
\
t* pr##_List_Last(const t##_LIST *l) { \
if (l) return (t*) GWEN_List1_GetLast(l);\
else return 0; \
} \
\
void pr##_List_Clear(t##_LIST *l) { \
t* el; \
while( (el=GWEN_List1_GetFirst(l)) ) {\
pr##_List_Del(el);\
pr##_free(el);\
} /* while */ \
} \
\
int pr##_List_HasElement(const t##_LIST *l, const t *element) { \
const t* el; \
el=(t*)GWEN_List1_GetFirst(l); \
while(el) {\
if (el==element) \
return 1; \
el=(const t*)GWEN_List1Element_GetNext(el->_list1_element); \
} /* while */ \
return 0; \
} \
\
t##_LIST* pr##_List_new(){\
return (t##_LIST*)GWEN_List1_new(); \
}\
\
void pr##_List_free(t##_LIST *l) {\
if (l) { \
pr##_List_Clear(l);\
GWEN_List1_free(l); \
}\
} \
\
t* pr##_List_Next(const t *element) { \
return (t*)GWEN_List1Element_GetNext(element->_list1_element);\
} \
\
t* pr##_List_Previous(const t *element) { \
return (t*)GWEN_List1Element_GetPrevious(element->_list1_element);\
} \
\
uint32_t pr##_List_GetCount(const t##_LIST *l){\
return GWEN_List1_GetCount(l);\
} \
\
t##_LIST_SORT_FN pr##_List_SetSortFn(t##_LIST *l, t##_LIST_SORT_FN fn) { \
return (t##_LIST_SORT_FN) GWEN_List1_SetSortFn(l, (GWEN_LIST1_SORT_FN) fn); \
} \
\
void pr##_List_Sort(t##_LIST *l, int ascending){\
GWEN_List1_Sort(l, ascending);\
}
/**
* Use this in your code file (*.c) inside the init code for the struct
* you want to use in lists (in GWEN these are the functions which end with
* "_new".
*/
#define GWEN_LIST_INIT(t, element) \
element->_list1_element=GWEN_List1Element_new(element);
/**
* Use this in your code file (*.c) inside the fini code for the struct
* you want to use in lists (in GWEN these are the functions which end with
* "_free".
*/
#define GWEN_LIST_FINI(t, element) \
if (element && element->_list1_element) { \
GWEN_List1Element_free(element->_list1_element); \
element->_list1_element=0; \
}
/*@}*/
/*@}*/ /* defgroup */
#ifdef __cplusplus
}
#endif
#endif
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