diff options
Diffstat (limited to 'ucs2-lib/src/ucs_dl.c')
| -rw-r--r-- | ucs2-lib/src/ucs_dl.c | 390 |
1 files changed, 390 insertions, 0 deletions
diff --git a/ucs2-lib/src/ucs_dl.c b/ucs2-lib/src/ucs_dl.c new file mode 100644 index 0000000..7bb106f --- /dev/null +++ b/ucs2-lib/src/ucs_dl.c @@ -0,0 +1,390 @@ +/*------------------------------------------------------------------------------------------------*/ +/* UNICENS V2.1.0-3491 */ +/* Copyright (c) 2017 Microchip Technology Germany II GmbH & Co. KG. */ +/* */ +/* 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, see <http://www.gnu.org/licenses/>. */ +/* */ +/* You may also obtain this software under a propriety license from Microchip. */ +/* Please contact Microchip for further information. */ +/*------------------------------------------------------------------------------------------------*/ + +/*! + * \file + * \brief Implementation of the doubly linked list. + * + * \cond UCS_INTERNAL_DOC + * \addtogroup G_DL + * @{ + */ + +/*------------------------------------------------------------------------------------------------*/ +/* Includes */ +/*------------------------------------------------------------------------------------------------*/ +#include "ucs_dl.h" +#include "ucs_trace.h" + +/*------------------------------------------------------------------------------------------------*/ +/* Implementation of class CDlList */ +/*------------------------------------------------------------------------------------------------*/ +/*! \brief Constructor of the doubly linked list class. + * \param self Instance pointer + * \param ucs_user_ptr User reference that needs to be passed in every callback function + */ +void Dl_Ctor(CDlList *self, void *ucs_user_ptr) +{ + self->head = NULL; + self->tail = NULL; + self->size = 0U; + self->ucs_user_ptr = ucs_user_ptr; +} + +/*! \brief Inserts a new node after an arbitrary node. + * \param self Instance pointer + * \param node Reference of the initial node + * \param new_node Reference of the new node are to be inserted + */ +void Dl_InsertAfter(CDlList *self, CDlNode *node, CDlNode *new_node) +{ + TR_ASSERT(self->ucs_user_ptr, "[DL]", (self->size <= 0xFFFFU)); + new_node->prev = node; + new_node->next = node->next; + if(node->next == NULL) /* Is initial node last node in list? */ + { + self->tail = new_node; /* Set new node as tail of list */ + } + else + { + node->next->prev = new_node; /* Adjust follower node */ + } + node->next = new_node; /* Adjust parent node */ + new_node->in_use = true; /* Signals that node is part of a list */ + self->size++; /* Increment number of nodes */ +} + +/*! \brief Inserts a new node before an arbitrary node. + * \param self Instance pointer + * \param node Reference of the initial node + * \param new_node Reference of the new node are to be inserted + */ +void Dl_InsertBefore(CDlList *self, CDlNode *node, CDlNode *new_node) +{ + TR_ASSERT(self->ucs_user_ptr, "[DL]", (self->size <= 0xFFFFU)); + new_node->prev = node->prev; + new_node->next = node; + if(node->prev == NULL) /* Is initial node first node in list? */ + { + self->head = new_node; /* Set new node as head of list */ + } + else + { + node->prev->next = new_node; /* Adjust parent node */ + } + node->prev = new_node; /* Adjust follower node */ + new_node->in_use = true; /* Signals that node is part of a list */ + self->size++; /* Increment number of nodes */ +} + +/*! \brief Sets the new node as head of a doubly linked list. + * \param self Instance pointer + * \param new_node Reference of the new node are to be placed as head of the list + */ +void Dl_InsertHead(CDlList *self, CDlNode *new_node) +{ + if(self->head == NULL) /* Is list empty? */ + { + TR_ASSERT(self->ucs_user_ptr, "[DL]", (self->size <= 0xFFFFU)); + self->head = new_node; + self->tail = new_node; + new_node->prev = NULL; + new_node->next = NULL; + new_node->in_use = true; /* Signals that node is part of a list */ + self->size++; /* Increment number of nodes */ + } + else + { + Dl_InsertBefore(self, self->head, new_node); + } +} + +/*! \brief Inserts the new node at the end of a doubly linked list. + * \param self Instance pointer + * \param new_node Reference of the new node are to be placed at the end of the list + */ +void Dl_InsertTail(CDlList *self, CDlNode *new_node) +{ + if(self->tail == NULL) /* Is list empty? */ + { + Dl_InsertHead(self, new_node); + } + else + { + Dl_InsertAfter(self, self->tail, new_node); + } +} + +/*! \brief Removes an arbitrary node from a doubly linked list. + * \param self Instance pointer + * \param node Reference of the node are to be removed from the list + * \return \c DL_OK: No error + * \return \c DL_UNKNOWN_NODE: Given node is not part of this list + */ +Dl_Ret_t Dl_Remove(CDlList *self, CDlNode *node) +{ + Dl_Ret_t ret_val = DL_UNKNOWN_NODE; + + if(Dl_IsNodeInList(self, node) != false) /* Is node part of list? */ + { + TR_ASSERT(self->ucs_user_ptr, "[DL]", (self->size > 0U)); + if(node->prev == NULL) /* First node in list? */ + { + self->head = node->next; /* Replace head node with next node in list */ + } + else /* -> Not first node in list */ + { + node->prev->next = node->next; /* Set next pointer of previous node to next node */ + } + if(node->next == NULL) /* Last node in list? */ + { + self->tail = node->prev; /* Replace tail node with previous node in list */ + } + else /* -> Not last node in list */ + { + node->next->prev = node->prev; /* Set previous ptr of next node to previous node */ + } + node->prev = NULL; + node->next = NULL; + node->in_use = false; /* Signals that node is not part of a list */ + ret_val = DL_OK; + self->size--; /* Decrement number of nodes */ + } + + return ret_val; +} + +/*! \brief Removes the first node in a doubly linked list. + * \param self Instance pointer + * \return The reference of the removed head node or \c NULL if the list is empty. + */ +CDlNode * Dl_PopHead(CDlList *self) +{ + CDlNode *node = self->head; + + if(node != NULL) /* Is list not empty? */ + { + TR_ASSERT(self->ucs_user_ptr, "[DL]", (self->size > 0U)); + self->head = node->next; /* Replace head node with next node in list */ + if(node->next == NULL) /* Last node in list? */ + { + self->tail = NULL; /* Replace tail node and set list's tail pointer + * to NULL + */ + } + else /* -> Not last node in list */ + { + node->next->prev = NULL; /* Set previous pointer of next node to NULL */ + } + node->prev = NULL; + node->next = NULL; + node->in_use = false; /* Signals that node is not part of a list */ + self->size--; /* Decrement number of nodes */ + } + + return node; +} + +/*! \brief Removes the last node in a doubly linked list. + * \param self Instance pointer + * \return The reference of the removed tail node or \c NULL if the list is empty. + */ +CDlNode * Dl_PopTail(CDlList *self) +{ + CDlNode *node = self->tail; + + if(node != NULL) /* Is list not empty? */ + { + TR_ASSERT(self->ucs_user_ptr, "[DL]", (self->size > 0U)); + if(node->prev == NULL) /* First node in list? */ + { + self->head = NULL; /* Replace head node and set list's head pointer + * to NULL + */ + } + else /* -> Not first node in list */ + { + node->prev->next = NULL; /* Set next pointer of previous node to NULL */ + } + self->tail = node->prev; /* Replace tail node with previous node in list */ + node->prev = NULL; + node->next = NULL; + node->in_use = false; /* Signals that node is not part of a list */ + self->size--; /* Decrement number of nodes */ + } + + return node; +} + +/*! \brief Returns the reference of the first node in a doubly linked list. + * \param self Instance pointer + * \return The reference of the head node or \c NULL if the list is empty. + */ +CDlNode * Dl_PeekHead(CDlList *self) +{ + return self->head; +} + +/*! \brief Returns the reference of the last node in a doubly linked list. + * \param self Instance pointer + * \return The reference of the tail node or NULL if the list is empty. + */ +CDlNode * Dl_PeekTail(CDlList *self) +{ + return self->tail; +} + +/*! \brief Calls the given function for each node in the doubly linked list. If the func_ptr + * returns true the loop is stopped and the current node will be returned. + * \param self Instance pointer + * \param func_ptr Reference of the callback function which is called for each node + * \param user_data_ptr Reference of optional user data given to func_ptr + * \return Returns the current node or \c NULL if the whole list is processed. + */ +CDlNode * Dl_Foreach(CDlList *self, Dl_ForeachFunc_t func_ptr, void *user_data_ptr) +{ + CDlNode *ret_val = NULL; + CDlNode *node = self->head; + + while(node != NULL) /* End of list reached? */ + { + if(func_ptr(node->data_ptr, user_data_ptr) != false) /* Data found? */ + { + ret_val = node; + break; + } + node = node->next; + } + return ret_val; +} + +/*! \brief Checks if a node is part of the given doubly linked list. + * \param self Instance pointer + * \param node Reference of the searched node + * \return \c true: Node is part of the given list + * \return \c false: Node is not part of the given list + */ +bool Dl_IsNodeInList(CDlList *self, const CDlNode *node) +{ + bool ret_val = false; + CDlNode *current_node = self->head; + + while(current_node != NULL) /* End of list reached? */ + { + if(current_node == node) /* Is current node the searched one */ + { + ret_val = true; + break; + } + current_node = current_node->next; + } + return ret_val; +} + +/*! \brief Appends one doubly linked list to another doubly linked list. + * \param self Instance pointer + * \param list_ptr Reference to the doubly linked list + */ +void Dl_AppendList(CDlList *self, CDlList *list_ptr) +{ + TR_ASSERT(self->ucs_user_ptr, "[DL]", (list_ptr != NULL)); + if(list_ptr->head != NULL) + { + if(self->tail == NULL) /* Is list empty? */ + { + self->head = list_ptr->head; + self->tail = list_ptr->tail; + self->size = list_ptr->size; + } + else + { + list_ptr->head->prev = self->tail; + self->tail->next = list_ptr->head; + self->tail = list_ptr->tail; + self->size += list_ptr->size; + } + list_ptr->head = NULL; + list_ptr->tail = NULL; + list_ptr->size = 0U; + } +} + +/*! \brief Interface function to retrieve the list size. + * \param self Instance pointer + * \return Size of the list + */ +uint16_t Dl_GetSize(CDlList *self) +{ + return self->size; +} + + +/*------------------------------------------------------------------------------------------------*/ +/* Implementation of class CDlNode */ +/*------------------------------------------------------------------------------------------------*/ +/*! \brief Constructor of doubly linked list nodes. + * \param self Instance pointer + * \param data_ptr Optional reference to data + */ +void Dln_Ctor(CDlNode *self, void *data_ptr) +{ + self->next = NULL; + self->prev = NULL; + self->in_use = false; + self->data_ptr = data_ptr; +} + +/*! \brief Interface function to set the data pointer of the given node. + * \param self Instance pointer + * \param data_ptr Reference of the new data + */ +void Dln_SetData(CDlNode *self, void *data_ptr) +{ + self->data_ptr = data_ptr; +} + +/*! \brief Interface function to request the data pointer of the given node. + * \param self Instance pointer + */ +void * Dln_GetData(CDlNode *self) +{ + return self->data_ptr; +} + +/*! \brief Checks if a node is part of a doubly linked list. + * \param self Instance pointer of the searched node + * \return \c true: Node is part of a list + * \return \c false: Node is not part of a list + */ +bool Dln_IsNodePartOfAList(CDlNode *self) +{ + return self->in_use; +} + +/*! + * @} + * \endcond + */ + +/*------------------------------------------------------------------------------------------------*/ +/* End of file */ +/*------------------------------------------------------------------------------------------------*/ + |