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stack.c

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00001 /* $Progeny: stack.c 3839 2003-11-17 04:25:01Z dsp $ */
00002 
00014 /*
00015  * AUTHOR: Josh Bressers <bressers@progeny.com>
00016  *
00017  * Copyright 2002 Progeny Linux Systems, Inc.
00018  *
00019  * Permission is hereby granted, free of charge, to any person obtaining a
00020  * copy of this software and associated documentation files (the "Software"),
00021  * to deal in the Software without restriction, including without limitation
00022  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
00023  * and/or sell copies of the Software, and to permit persons to whom the
00024  * Software is furnished to do so, subject to the following conditions:
00025  *
00026  * The above copyright notice and this permission notice shall be included in
00027  * all copies or substantial portions of the Software.
00028  *
00029  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00030  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00031  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
00032  * THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00033  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
00034  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
00035  * DEALINGS IN THE SOFTWARE.
00036  */
00037 
00038 #include <stdio.h>
00039 #include <assert.h>
00040 #include <stdbool.h>
00041 #include <stdlib.h>
00042 
00043 #include <utils.h>
00044 #include "stack.h"
00045 
00046 
00048 discover_xml_stack * discover_xml_stack_new()
00049 {
00050     discover_xml_stack *stack;
00051     stack = (discover_xml_stack *) _discover_xmalloc(sizeof(discover_xml_stack));
00052     assert(stack != NULL);
00053 
00054     stack->prev = NULL;
00055     stack->data = NULL;
00056     stack->depth = 0;
00057 
00058     return stack;
00059 }
00060 
00062 void discover_xml_stack_destroy(discover_xml_stack *stack)
00063 {
00064     free(stack);
00065 }
00066 
00068 void
00069 discover_xml_stack_push(discover_xml_stack **stack, void *data)
00070 {
00071     discover_xml_stack *new_stack;
00072 
00073     new_stack = discover_xml_stack_new();
00074 
00075 
00076     new_stack->prev = *stack;
00077     new_stack->data = data;
00078     new_stack->depth = (*stack)->depth + 1;
00079     *stack = new_stack;
00080 }
00081 
00083 void * discover_xml_stack_pop(discover_xml_stack **stack)
00084 {
00085     void *ctx;
00086     discover_xml_stack *oldstack;
00087 
00088     if((*stack)->prev == 0) {
00089         return NULL;
00090     }
00091 
00092     oldstack = *stack;
00093     ctx = (*stack)->data;
00094 
00095     *stack = (*stack)->prev;
00096     (*stack)->depth = oldstack->depth - 1;
00097     discover_xml_stack_destroy(oldstack);
00098 
00099     return ctx;
00100 }
00101 
00103 void * discover_xml_stack_get(discover_xml_stack *stack)
00104 {
00105         return stack->data;
00106 }
00107 
00109 void * discover_xml_stack_getbynum(discover_xml_stack *stack, int i)
00110 {
00111     discover_xml_stack *S;
00112 
00113     S = stack;
00114     while(S->depth < i) {
00115         S = stack->prev;
00116     }
00117     return S->data;
00118 }
00119 
00120 /*
00121  * Local variables:
00122  * c-file-style: "progeny"
00123  * indent-tabs-mode: nil
00124  * End:
00125  */
00126 /* vim: set cin fo=tcroq sw=4 et sts=4 tw=75: */

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