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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Rev | Line | |
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[e95d652] | 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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