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00038 #include <stdio.h>
00039 #include <assert.h>
00040 #include <stdbool.h>
00041 #include <stdlib.h>
00042 
00043 #include <discover/utils.h>
00044 #include <discover/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 }
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