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annotate examples/dsl/query.h @ 7:57b2cc9b87f7

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Use memcpy instead of strncpy when we know the length anyway. Modern gcc seems to think it knows how to detect misuse of strncpy, but it's wrong (in fact: very, very wrong) and the path of least resistance is to not try to fight with it.
author David A. Holland
date Mon, 30 May 2022 23:47:52 -0400
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1 /*****
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2
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3 AnaGram Programming Examples
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4
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5 A Dos Script Language
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6 Query Table Definitions
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7
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8 Copyright 1993 Parsifal Software. All Rights Reserved.
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9
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10 This software is provided 'as-is', without any express or implied
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11 warranty. In no event will the authors be held liable for any damages
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12 arising from the use of this software.
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13
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14 Permission is granted to anyone to use this software for any purpose,
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15 including commercial applications, and to alter it and redistribute it
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16 freely, subject to the following restrictions:
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17
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18 1. The origin of this software must not be misrepresented; you must not
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19 claim that you wrote the original software. If you use this software
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20 in a product, an acknowledgment in the product documentation would be
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21 appreciated but is not required.
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22 2. Altered source versions must be plainly marked as such, and must not be
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23 misrepresented as being the original software.
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24 3. This notice may not be removed or altered from any source distribution.
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25
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26 *****/
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27
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28 #ifndef QUERY_H
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29 #define QUERY_H
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30
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31 #include "screen.h"
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32 #include "stack.h"
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33 #include <stddef.h>
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34 #include "symbol.h"
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35
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36 struct query_item {
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37 int id;
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38 int *value;
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39 int *prompt;
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40 int *explanation;
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41 action_pointer action;
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42 };
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43
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44 class screen_descriptor {
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45 public:
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46 int *title;
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47 unsigned char color, entry_color, highlight_color;
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48 int height, width;
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49 pair<int> pos;
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50 screen_descriptor() {
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51 screen_rect display = at(0,0);
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52 title = NULL;
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53 color = entry_color = highlight_color = 0;
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54 height = display.size.y;
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55 width = display.size.x;
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56 pos.x = pos.y = -1;
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57 }
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58 };
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59
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60 class query_table {
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61 public:
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62 int *title;
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63 screen_rect window_box; // window for box
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64 screen_rect window; // window for data
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65 char_cell *previous; // previous content of window
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66 int nq; // number of query items
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67 query_item *q; // query item array
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68 screen_rect *sr; // display rectangles
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69 unsigned char *field_color;
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70 int nbl; // blank lines to insert between entries
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71 int first_line; // vertical location of first line
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72 int title_line; // vertical location of title line
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73 int exp_line; // vertical location of explanation
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74 int dx; // horizontal location of data field
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75 int px; // horizontal location of prompt field
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76 int pw; // prompt field width
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77 int dw; // data field width
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78 int current_field;
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79 unsigned char color, highlight_color, entry_color;
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80 int height, width;
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81
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82
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83 // Constructor
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84
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85 query_table(stack<query_item> &qs, screen_descriptor *scd);
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86
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87 // Destructor
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88
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89 ~query_table();
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90
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91 query_table &resize(void);
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92 query_table &refresh(void);
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93 int edit_line(void);
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94 };
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95
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96 extern stack <query_item> qs;
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97
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98 #endif