| 1 | /* Copyright (c) 1985 Ceriel J.H. Jacobs */
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| 2 |
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| 3 | /* $Header: /cvsup/minix/src/commands/yap/display.h,v 1.1.1.1 2005/04/21 14:55:39 beng Exp $ */
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| 4 |
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| 5 | # ifndef _DISPLAY_
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| 6 | # define PUBLIC extern
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| 7 | # else
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| 8 | # define PUBLIC
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| 9 | # endif
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| 10 |
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| 11 | # define MINPAGESIZE 5
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| 12 |
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| 13 | PUBLIC int pagesize; /* How many lines on a page */
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| 14 | PUBLIC int maxpagesize; /* Maximum # of lines on a page */
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| 15 | PUBLIC int scrollsize; /* number of lines in a scroll */
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| 16 | struct scr_info {
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| 17 | struct linelist {
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| 18 | int cnt; /* # of screenlines for this line */
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| 19 | long line; /* lineno of this line */
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| 20 | # define firstline head->line
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| 21 | # define lastline tail->line
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| 22 | struct linelist *next;
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| 23 | struct linelist *prev;
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| 24 | } *tail, *head; /* Of all lines of the input file that are
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| 25 | * on the screen, remember how many
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| 26 | * screenlines they occupy. Keep this
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| 27 | * info in a doubly linked list.
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| 28 | */
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| 29 | int nf; /* How many screenlines of the first line
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| 30 | * on the screen are not on the screen?
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| 31 | */
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| 32 | int currentpos; /* Y coordinate of first free line */
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| 33 | struct linelist ssaavv; /* Mark */
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| 34 | # define savfirst ssaavv.line
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| 35 | # define savnf ssaavv.cnt
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| 36 | };
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| 37 |
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| 38 | PUBLIC struct scr_info scr_info;
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| 39 | PUBLIC int status; /* EOFILE on end of file
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| 40 | * START on start of file
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| 41 | * logical "or" if both
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| 42 | */
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| 43 | /* Flags for status field */
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| 44 |
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| 45 | # define EOFILE 01
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| 46 | # define START 02
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| 47 |
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| 48 | VOID redraw();
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| 49 | /*
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| 50 | * void redraw(flag)
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| 51 | * int flag; Either 0 or 1
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| 52 | *
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| 53 | * Redraws the screen. If flag = 1, the screen is redrawn as precisely
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| 54 | * as possible, otherwise one page is displayed (which possibly does not
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| 55 | * take a whole screen.
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| 56 | */
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| 57 |
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| 58 | int display();
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| 59 | /*
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| 60 | * int display(firstline, nodispl, nlines, really)
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| 61 | * long firstline; Line with which to start
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| 62 | * int nodispl; Do not display nodispl lines of it
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| 63 | * int nlines; Number of screen lines that must be displayed
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| 64 | * int really; Either 0 or 1
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| 65 | *
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| 66 | * Displays nlines as a page. if "really" = 0, the actual displaying is not
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| 67 | * performed. Only the computing associated with it is done.
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| 68 | */
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| 69 |
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| 70 | int scrollf();
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| 71 | /*
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| 72 | * int scrollf(nlines,really)
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| 73 | * int nlines; Number of lines to scroll
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| 74 | * int really; Either 0 or 1, see explanation above
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| 75 | *
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| 76 | * Scroll forwards "nlines" (screen)lines.
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| 77 | */
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| 78 |
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| 79 | int scrollb();
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| 80 | /*
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| 81 | * int scrollb(nlines,really)
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| 82 | * int nlines; Number of lines to scroll
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| 83 | * int really; Either 0 or 1, see explanation above
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| 84 | *
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| 85 | * Scroll backwards "nlines" (screen)lines.
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| 86 | */
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| 87 |
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| 88 | int tomark();
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| 89 | /*
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| 90 | * int tomark(cnt)
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| 91 | * long cnt; (Argument ignored)
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| 92 | *
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| 93 | * Display a page starting at the mark. If there was no
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| 94 | * mark, display the first page of the file.
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| 95 | * (There is always assumed to be a mark, the initial one is on the first page
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| 96 | * of the file).
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| 97 | */
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| 98 |
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| 99 | int setmark();
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| 100 | /*
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| 101 | * int setmark(cnt)
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| 102 | * long cnt; (Argument ignored)
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| 103 | *
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| 104 | * Sets a mark on the current page.
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| 105 | * It returns nothing (but the address is taken ...)
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| 106 | */
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| 107 |
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| 108 | int exgmark();
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| 109 | /*
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| 110 | * int exgmark(cnt)
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| 111 | * long cnt; (Argumewnt ignored)
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| 112 | *
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| 113 | * Sets the mark on the current page and displays the
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| 114 | * previously marked page.
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| 115 | */
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| 116 |
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| 117 | VOID d_clean();
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| 118 | /*
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| 119 | * void d_clean()
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| 120 | *
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| 121 | * Clean up and initialize. To be called before displaying a new file
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| 122 | */
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| 123 |
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| 124 | # undef PUBLIC
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