meiyap1
Last change
on this file since 6e73091 was
e95d652,
checked in by Mei <mei@…>, 13 years ago
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1) added yap, flex, bison to bring in prolog backend
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-
Property mode set to
100644
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File size:
1.1 KB
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1 | #include <stdlib.h> |
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2 | |
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3 | #include "abac_stack.h" |
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4 | #include "abac_util.h" |
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5 | |
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6 | abac_stack_t *abac_stack_new(void) { |
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7 | abac_stack_t *ret = abac_xmalloc(sizeof(abac_stack_t)); |
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8 | ret->elts = NULL; |
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9 | ret->size = 0; |
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10 | return ret; |
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11 | } |
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12 | |
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13 | void abac_stack_push(abac_stack_t *stack, void *elt) { |
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14 | abac_stack_element_t *new_element = abac_xmalloc(sizeof(abac_stack_element_t)); |
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15 | |
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16 | new_element->ptr = elt; |
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17 | DL_APPEND(stack->elts, new_element); |
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18 | ++stack->size; |
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19 | } |
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20 | |
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21 | void *abac_stack_pop(abac_stack_t *stack) { |
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22 | abac_stack_element_t *cur; |
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23 | void *ret; |
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24 | |
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25 | if(stack->size>0) { |
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26 | cur=stack->elts; |
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27 | ret=cur->ptr; |
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28 | DL_DELETE(list->elts, cur); |
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29 | free(cur); |
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30 | --list->size; |
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31 | return ret; |
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32 | } |
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33 | // reutrn false if we don't |
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34 | return NULL; |
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35 | } |
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36 | |
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37 | int abac_stack_size(abac_stack_t *stack) { |
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38 | return stack->size; |
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39 | } |
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40 | |
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41 | void abac_stack_free(abac_stack_t *stack) { |
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42 | abac_stack_element_t *elt, *tmp; |
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43 | |
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44 | // free everthing in the stack |
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45 | DL_FOREACH_SAFE(stack->elts, elt, tmp) { |
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46 | DL_DELETE(stack->elts, elt); |
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47 | free(elt); |
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48 | } |
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49 | |
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50 | // free the list |
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51 | free(stack); |
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52 | } |
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