87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
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/*
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* Wslay - The WebSocket Library
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*
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* Copyright (c) 2011, 2012 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "wslay_stack.h"
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#include <string.h>
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#include <assert.h>
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struct wslay_stack* wslay_stack_new()
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{
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struct wslay_stack *stack = (struct wslay_stack*)malloc
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(sizeof(struct wslay_stack));
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if(!stack) {
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return NULL;
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}
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stack->top = NULL;
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return stack;
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}
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void wslay_stack_free(struct wslay_stack *stack)
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{
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struct wslay_stack_cell *p;
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if(!stack) {
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return;
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}
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p = stack->top;
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while(p) {
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struct wslay_stack_cell *next = p->next;
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free(p);
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p = next;
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}
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free(stack);
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}
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int wslay_stack_push(struct wslay_stack *stack, void *data)
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{
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struct wslay_stack_cell *new_cell = (struct wslay_stack_cell*)malloc
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(sizeof(struct wslay_stack_cell));
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if(!new_cell) {
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return WSLAY_ERR_NOMEM;
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}
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new_cell->data = data;
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new_cell->next = stack->top;
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stack->top = new_cell;
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return 0;
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}
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void wslay_stack_pop(struct wslay_stack *stack)
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{
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struct wslay_stack_cell *top = stack->top;
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assert(top);
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stack->top = top->next;
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free(top);
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}
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void* wslay_stack_top(struct wslay_stack *stack)
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{
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assert(stack->top);
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return stack->top->data;
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}
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int wslay_stack_empty(struct wslay_stack *stack)
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{
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return stack->top == NULL;
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}
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