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annotate lwlib/lw_stack.c @ 329:c15cca3ae6a2

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Created first pass of input layer
author lost
date Sun, 28 Feb 2010 05:01:31 +0000
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329
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1 /*
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2 lw_stack.c
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3
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4 Copyright © 2010 William Astle
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5
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6 This file is part of LWTOOLS.
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7
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8 LWTOOLS is free software: you can redistribute it and/or modify it under the
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9 terms of the GNU General Public License as published by the Free Software
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10 Foundation, either version 3 of the License, or (at your option) any later
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11 version.
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12
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13 This program is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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16 more details.
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17
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18 You should have received a copy of the GNU General Public License along with
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19 this program. If not, see <http://www.gnu.org/licenses/>.
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20 */
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21
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22 #include <config.h>
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23
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24 #define ___lw_stack_c_seen___
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25 #include <lw_stack.h>
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26 #include <lw_alloc.h>
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27
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28 /* this is technically valid but dubious */
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29 #define NULL 0
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30
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31 lw_stack_t lw_stack_create(void (*freefn)(void *d))
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32 {
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33 lw_stack_t S;
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34
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35 S = lw_alloc(sizeof(lw_stack_t));
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36 S -> head = NULL;
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37 S -> freefn = freefn;
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38 return S;
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39 }
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40
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41 void *lw_stack_pop(lw_stack_t S)
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42 {
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43 if (S -> head)
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44 {
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45 void *ret, *r2;
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46
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47 ret = S -> head -> data;
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48 r2 = S -> head;
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49 S -> head = S -> head -> next;
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50 lw_free(r2);
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51 return ret;
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52 }
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53 return NULL;
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54 }
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55
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56 void lw_stack_destroy(lw_stack_t S)
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57 {
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58 void *d;
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59
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60 while (d = lw_stack_pop(S))
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61 (S->freefn)(d);
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62 lw_free(S);
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63 }
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64
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65 void *lw_stack_top(lw_stack_t S)
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66 {
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67 if (S -> head)
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68 return S -> head -> data;
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69 return NULL;
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70 }
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71
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72 void lw_stack_push(lw_stack_t S, void *item)
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73 {
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74 struct lw_stack_node_priv *t;
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75
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76 t = lw_alloc(sizeof(struct lw_stack_node_priv));
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77 t -> next = S -> head;
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78 S -> head = t;
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79 t -> data = item;
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80 }