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55 lines
935 B
C
55 lines
935 B
C
/* radare - LGPL - Copyright 2007-2015 - ret2libc */
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#include <r_util.h>
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R_API RStack *r_stack_new(unsigned int n) {
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RStack *s = R_NEW0 (RStack);
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if (!s) return NULL;
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s->elems = R_NEWS0 (void *, n);
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if (!s->elems) {
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free (s);
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return NULL;
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}
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s->n_elems = n;
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s->top = -1;
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return s;
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}
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R_API void r_stack_free(RStack *s) {
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free (s->elems);
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free (s);
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}
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R_API int r_stack_push(RStack *s, void *el) {
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if (s->top == s->n_elems - 1) {
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/* reallocate the stack */
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s->n_elems *= 2;
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s->elems = realloc (s->elems, s->n_elems * sizeof (void *));
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if (!s->elems)
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return R_FALSE;
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}
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s->top++;
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s->elems[s->top] = el;
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return R_TRUE;
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}
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R_API void *r_stack_pop(RStack *s) {
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void *res;
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if (s->top == -1)
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return NULL;
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res = s->elems[s->top];
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s->top--;
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return res;
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}
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R_API int r_stack_is_empty(RStack *s) {
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return s->top == -1;
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}
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R_API unsigned int r_stack_size(RStack *s) {
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return (unsigned int)(s->top + 1);
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}
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