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annotate lwlib/lw_stack.c @ 207:07e1fac76321

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Added pragma to allow non case sensitive symbols Added "nosymbolcase" and "symbolnocase" pragmas to cause symbols defined while the pragma is in effect to be treated as case insensitive. Also documented the new pragma.
author William Astle <lost@l-w.ca>
date Sat, 09 Jun 2012 15:47:22 -0600
parents 00ddfdc1e1e3
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 #define ___lw_stack_c_seen___
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23 #include "lw_stack.h"
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24 #include "lw_alloc.h"
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25
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26 /* this is technically valid but dubious */
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27 #define NULL 0
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28
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29 lw_stack_t lw_stack_create(void (*freefn)(void *d))
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30 {
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31 lw_stack_t S;
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32
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00ddfdc1e1e3 Fixed wrong size in lw_alloc() for lw_stack_create()
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33 S = lw_alloc(sizeof(struct lw_stack_priv));
0
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34 S -> head = NULL;
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35 S -> freefn = freefn;
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36 return S;
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37 }
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38
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39 void *lw_stack_pop(lw_stack_t S)
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40 {
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41 if (S -> head)
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42 {
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43 void *ret, *r2;
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44
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45 ret = S -> head -> data;
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46 r2 = S -> head;
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47 S -> head = S -> head -> next;
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48 lw_free(r2);
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49 return ret;
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50 }
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51 return NULL;
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52 }
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53
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54 void lw_stack_destroy(lw_stack_t S)
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55 {
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56 void *d;
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57
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58 while ((d = lw_stack_pop(S)))
0
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59 (S->freefn)(d);
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60 lw_free(S);
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61 }
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62
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63 void *lw_stack_top(lw_stack_t S)
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64 {
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65 if (S -> head)
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66 return S -> head -> data;
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67 return NULL;
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68 }
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70 void lw_stack_push(lw_stack_t S, void *item)
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71 {
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72 struct lw_stack_node_priv *t;
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73
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74 t = lw_alloc(sizeof(struct lw_stack_node_priv));
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75 t -> next = S -> head;
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76 S -> head = t;
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77 t -> data = item;
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78 }