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/**
* This program is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*
* (c) Vincenzo Nicosia 2009-2017 -- <v.nicosia@qmul.ac.uk>
*
* This file is part of NetBunch, a package for complex network
* analysis and modelling. For more information please visit:
*
* http://www.complex-networks.net/
*
* If you use this software, please add a reference to
*
* V. Latora, V. Nicosia, G. Russo
* "Complex Networks: Principles, Methods and Applications"
* Cambridge University Press (2017)
* ISBN: 9781107103184
*
***********************************************************************
*
* Implementation of a stack data structure (for unsigned integers)
*
*/
#include <stdio.h>
#include <stdlib.h>
#include "stack.h"
void stack_create(my_stack_t *s){
s->size = 10;
s->head = -1;
s->v = malloc(s->size * sizeof(int));
}
void stack_push(my_stack_t *s, unsigned int n){
if (s->head == s->size - 1){
s->size += 10;
s->v = realloc(s->v, s->size * sizeof(unsigned int));
if (!s->v){
fprintf(stderr, "Unable to allocate more memory in stack.c:stack_push... Exiting!\n");
exit(17);
}
}
s->head++;
s->v[s->head] = n;
}
int stack_pop(my_stack_t *s, unsigned int *res){
if (!stack_empty(s)){
*res = s->v[s->head];
s->head--;
return 0;
}
else{
return -1;
}
}
int stack_empty(my_stack_t *s){
return (s->head < 0 ? 1 : 0);
}
void stack_dump(my_stack_t *s, FILE *fileout){
int i;
for(i=s->head; i>=0; i--){
fprintf(fileout, "%d ", s->v[i]);
}
fprintf(fileout, "\n");
}
int stack_size(my_stack_t *s){
return s->head + 1;
}
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