list_nav.h
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/**
* \file scot/list_nav.h
* \author Georg Steffers <georg@steffers.org>
* \brief Templates of functions to navigate within typesafe lists.
*
* Here are macro definitions that create functions to navigate within
* typesafe lists. That is get next node, get first node a.s.f
*
* Normally the macros defined here will be never called directly but only
* via MACROS that group them in a sensefull way in scot/list_impl.h.\n
* \anchor onlyfunc_nav
* \attention
* All documentation here does document the functions that are created by
* the macros, as the macros themself are pretty easy and all used the same.
* They are called with a type, that MUST be one word (use typedef if needed)
* and generates the function defined with their value.
*
* Copyright (C)2006 Georg Steffers <georg@steffers.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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef LIST_NAV_H
#define LIST_NAV_H
#include <stdlib.h>
#include <scot/list_impl.h>
/**
* \internal
* \param node a list_[type]_node_t* that should be checked for
* beeing an anchor.
* \param line the line where this MACRO is called.
* \pre a variable of type list_[type]_node_t* must exist.
* \return the code fragment
* \post None
*
* \brief check for anchor.
*
* This checks if the given \a node is an anchor. If not it calls
* LIST_ERROR, which either raises an exception if exceptions are user
* or otherwise prints out an error message to stderr and aborts the
* program.
*/
#define NAV_NODE_NO_ANCHOR_ERROR(node, line) \
if ((node->e) != NULL) \
LIST_ERROR ("list_nav.h", (line), NODE_NO_ANCHOR_ERR);
/**
* \attention
* Only the generated function is explained here, for the reason look
* \ref onlyfunc_man "here".
*
* \param anchor A pointer to the list anchor.
* \pre The \a anchor has to be not NULL and a valid
* anchor.
* \return The first node in the list, that is normally
* the anchor, thus this is pretty useless.
* \post None
*
* \brief Returns the first element in the list, that is the anchor...
* pathetic...
*/
#define GEN_LIST_FRONT(type) \
STATIC \
list_ ## type ## _node_t * \
list_ ## type ## _front (list_ ## type ## _node_t *anchor) \
{ \
LIST_EXC_START \
{ \
LIST_CHECK_NULL (anchor, "list_nav.h", 20); \
NAV_NODE_NO_ANCHOR_ERROR (anchor, 21); \
} \
LIST_EXC_END ("list_nav.h", 23, LIST_FRONT_ERR); \
\
return anchor; \
}
/**
* \attention
* Only the generated function is explained here, for the reason look
* \ref onlyfunc_man "here".
*
* \param anchor A pointer to the list anchor.
* \pre The \a anchor has to be not NULL and a valid
* anchor.
* \return The last node in the list.
* \post None
*
* \brief Get the last node in the list.
*/
#define GEN_LIST_LAST(type) \
STATIC \
list_ ## type ## _node_t * \
list_ ## type ## _last (list_ ## type ## _node_t *anchor) \
{ \
LIST_EXC_START \
{ \
LIST_CHECK_NULL (anchor, "list_nav.h", 35); \
NAV_NODE_NO_ANCHOR_ERROR (anchor, 36); \
} \
LIST_EXC_END ("list_nav.h", 38, LIST_LAST_ERR); \
\
return anchor->prev; \
}
/**
* \attention
* Only the generated function is explained here, for the reason look
* \ref onlyfunc_man "here".
*
* \param node A pointer to a node in the list.
* \pre The node has to be not NULL and should be in
* a linked list.
* \return The next node after the given node.
* \post None
*
* \brief Get the next node in the list.
*/
#define GEN_LIST_NEXT(type) \
STATIC \
list_ ## type ## _node_t * \
list_ ## type ## _next (list_ ## type ## _node_t *node) \
{ \
LIST_EXC_START \
LIST_CHECK_NULL (node, "list_nav.h", 49); \
LIST_EXC_END ("list_nav.h", 50, LIST_NEXT_ERR); \
\
return node->next; \
}
/**
* \attention
* Only the generated function is explained here, for the reason look
* \ref onlyfunc_man "here".
*
* \param node A pointer to a node in the list.
* \pre The node has to be not NULL and should be in
* a linked list.
* \return The previous node after the given node.
* \post None
*
* \brief Get the previous node in the list.
*/
#define GEN_LIST_PREV(type) \
STATIC \
list_ ## type ## _node_t * \
list_ ## type ## _prev (list_ ## type ## _node_t *node) \
{ \
LIST_EXC_START \
LIST_CHECK_NULL (node, "list_nav.h", 61); \
LIST_EXC_END ("list_nav.h", 62, LIST_PREV_ERR); \
\
return node->prev; \
}
/**
* \attention
* Only the generated function is explained here, for the reason look
* \ref onlyfunc_man "here".
*
* \param anchor A pointer to the list anchor.
* \param e A pointer to a variable of the \a type, the
* list was created for.
* \pre The \a anchor has to be not NULL and a valid
* anchor.\a e must not be NULL.
* \return The node that contains \a e.
* \post None
*
* \brief Find the node in the list that contains \a e.
*/
#define GEN_LIST_FIND(type) \
STATIC \
list_ ## type ## _node_t * \
list_ ## type ## _find ( \
list_ ## type ## _node_t *anchor, \
const type *e) \
{ \
list_ ## type ## _node_t *ret = NULL; \
\
LIST_EXC_START \
{ \
list_ ## type ## _node_t *node; \
\
LIST_CHECK_NULL (anchor, "list_nav.h", 80); \
NAV_NODE_NO_ANCHOR_ERROR (anchor, 81); \
\
node = anchor; \
while (! list_ ## type ## _eol (anchor, node)) \
{ \
node = node->next; \
\
if (node->e != NULL) \
if (list_ ## type ## _compare (e, node->e) == 0) \
ret = node; \
} \
} \
LIST_EXC_END ("list_nav.h", 93, LIST_FIND_ERR); \
\
return ret; \
}
/**
* \attention
* Only the generated function is explained here, for the reason look
* \ref onlyfunc_man "here".
*
* \param node A pointer to a node in the list.
* \pre The node has to be not NULL and should be in
* a linked list.
* \return The anchor of the list, the \a node is in.
* \post None
*
* \brief Get the anchor of the list.
*/
#define GEN_LIST_FIND_ANCHOR(type) \
STATIC \
list_ ## type ## _node_t * \
list_ ## type ## _find_anchor ( \
list_ ## type ## _node_t *entry) \
{ \
list_ ## type ## _node_t *ret = NULL; \
\
LIST_EXC_START \
{ \
list_ ## type ## _node_t *node; \
\
LIST_CHECK_NULL (entry, "list_nav.h", 110); \
\
node = entry; \
if (node->e == NULL) \
ret = node; \
\
while (! list_ ## type ## _eol (entry, node)) \
{ \
node = node->next; \
\
if (node->e == NULL) \
ret = node; \
} \
\
if (ret == NULL) \
LIST_ERROR ("list_nav.h", 125, MALFORMED_LIST_ERR); \
} \
LIST_EXC_END ("list_nav.h", 127, LIST_FIND_ANCHOR_ERR); \
\
return NULL; \
}
/**
* \param type the datatype that this list code should handle.
* \pre Type must be a single word typename. If one wants
* to use e.g. lists of structs one has to use typedef
* to create a single word type name like this:
* typedef struct mystruct_t mystruct_t;
* \return Nothing
* \post The functions for the given datatype that are described
* here are generated within the calling build file.
*
* \brief create functions neccesary to modify lists of the given \a type.
*
* Normally this is not called directly, but by GEN_LIST_IMPL() because this
* defines just a subset of all functions neccesarry to handle typesafe lists.
*/
#define GEN_LIST_NAVIGATION(type) \
GEN_LIST_FRONT (type); \
GEN_LIST_LAST (type); \
GEN_LIST_NEXT (type); \
GEN_LIST_PREV (type); \
GEN_LIST_FIND (type); \
GEN_LIST_FIND_ANCHOR (type);
#endif /* LIST_NAV_H */