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annotate lwlib/lw_stack.c @ 536:33a59e232a5b

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Fix basic output target to keep lines below 249 characters The line length limiter in the basic output was not properly moving to the next before 249 characters, which is the limit Color Basic can read in an ASCII basic program. Changed the line limiter to 240 from 247 to account for a possible 5 digit number plus a comma and just a bit of extra breathing space.
author William Astle <lost@l-w.ca>
date Thu, 16 Jun 2022 13:55:34 -0600
parents 00ddfdc1e1e3
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
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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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69
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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 }