mirror of
https://github.com/usmannasir/cyberpanel.git
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139 lines
3.9 KiB
C
139 lines
3.9 KiB
C
/*****************************************************************************
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* Open LiteSpeed is an open source HTTP server. *
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* Copyright (C) 2013 - 2015 LiteSpeed Technologies, Inc. *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation, either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see http://www.gnu.org/licenses/. *
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*****************************************************************************/
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#ifndef LS_STACK_H
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#define LS_STACK_H
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#include <lsr/ls_node.h>
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#include <lsr/ls_types.h>
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#include <stdlib.h>
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/**
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* @file
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*
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* \warning This version is the simple stack implementation.
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* ls_stack_ does \b NOT provide any concurrency protection.
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*
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* This uses ls_nodei_t as the nodes. In order to use the stack,
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* the objects the user wishes to link should either inherit from,
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* or contain a ls_nodei_t struct.
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*
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* Other Versions:
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* - lsr/ls_lfstack.h
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* - lsr/ls_tsstack.h
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct ls_stack_s
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{
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ls_nodei_t *phead;
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} ls_stack_t;
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/** @ls_stack_init
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* @brief Initializes a simple stack object.
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* @details The function initalizes an object to manage a
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* node-based stack (LIFO). This implementation is
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* \b NOT thread safe.
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*
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* @param[in] pThis - A pointer to an allocated stack object.
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* @return Void.
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*
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* @see ls_stack_destroy
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*/
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ls_inline void ls_stack_init(ls_stack_t *pThis)
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{
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pThis->phead = NULL;
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}
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/** @ls_stack_destroy
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* @brief Destroys a stack object.
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*
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* @param[in] pThis - A pointer to an initialized stack object.
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* @return Void.
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*
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* @see ls_stack_init
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*/
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ls_inline void ls_stack_destroy(ls_stack_t *pThis)
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{
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pThis->phead = NULL;
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}
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/** @ls_stack_new
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* @brief Creates a new stack object.
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* @details The function allocates and initalizes an object
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* to manage a node-based stack (LIFO). This implementation is
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* \b NOT thread safe.
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*
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* @return A pointer to an initialized stack object, else NULL on error.
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*
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* @see ls_stack_delete
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*/
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ls_stack_t *ls_stack_new();
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/** @ls_stack_delete
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* @brief Destroys then deletes a stack object.
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* @details The object should have been created with a previous
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* successful call to ls_stack_new.
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*
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* @param[in] pThis - A pointer to an initialized stack object.
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* @return Void.
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*
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* @see ls_stack_new
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*/
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void ls_stack_delete(ls_stack_t *pThis);
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/** @ls_stack_push
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* @brief Pushes an object onto the top of a stack.
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*
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* @param[in] pThis - A pointer to an initalized stack object.
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* @param[in] pNode - A pointer to the user defined object to put on the stack.
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* @return Void.
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*/
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ls_inline void ls_stack_push(ls_stack_t *pThis, ls_nodei_t *pNode)
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{
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pNode->next = pThis->phead;
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pThis->phead = pNode;
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}
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/** @ls_stack_pop
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* @brief Pops an object from the top of a stack.
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*
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* @param[in] pThis - A pointer to an initialized stack object.
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* @return a pointer to the object if one exists, else NULL if empty.
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*/
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ls_inline ls_nodei_t *ls_stack_pop(ls_stack_t *pThis)
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{
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ls_nodei_t *pNode = pThis->phead;
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if (pNode)
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pThis->phead = pNode->next;
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return pNode;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif //LS_STACK_H
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