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328
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1 /*
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2 input.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 /*
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25 This file is used to handle reading input files. It serves to encapsulate
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26 the entire input system to make porting to different media and systems
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27 less difficult.
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28 */
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29
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30 #include <lw_alloc.h>
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31 #include <lw_stringlist.h>
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32
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33 struct input_layer
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34 {
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35 lw_stringlist_t inputlist;
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36 struct input_layer *nextlayer;
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37
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38 FILE *fp;
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39 };
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40
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41
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42 static struct input_layer *layerstack = NULL;
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43
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44 void input_push(lw_stringlist_t list)
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45 {
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46 struct input_layer *i;
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47
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48 i = lw_alloc(sizeof(struct input_layer));
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49 i -> nextlayer = layerstack;
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50 layerstack = i;
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51 i -> inputlist = lw_stringlist_copy(list);
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52 }
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53
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54 /* fetch a line of input from the top of the input stack */
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55 /* return NULL if no input left */
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56 char *input_fetchline(void)
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57 {
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58 again:
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59 if (!layerstack)
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60 return NULL;
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61
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62 if (!layerstack -> fp)
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63 {
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64 // no open file
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65 char *fn;
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66
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67 fn = lw_stringlist_current(layerstack -> inputlist);
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68 lw_stringlist_next(layerstack -> inputlist);
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69 if (!fn)
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70 {
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71 struct input_list *t;
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72 t = layerstack;
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73 layerstack = layerstack -> nextlayer;
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74 lw_stringlist_destroy(t -> inputlist);
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75 lw_free(t);
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76 goto again;
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77 }
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78
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79 // open the file here
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80 }
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81
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82
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83 }
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