125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
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/* Copyright (c) 1985 Ceriel J.H. Jacobs */
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/* $Header$ */
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# ifndef _DISPLAY_
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# define PUBLIC extern
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# else
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# define PUBLIC
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# endif
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# define MINPAGESIZE 5
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PUBLIC int pagesize; /* How many lines on a page */
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PUBLIC int maxpagesize; /* Maximum # of lines on a page */
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PUBLIC int scrollsize; /* number of lines in a scroll */
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struct scr_info {
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struct linelist {
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int cnt; /* # of screenlines for this line */
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long line; /* lineno of this line */
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# define firstline head->line
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# define lastline tail->line
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struct linelist *next;
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struct linelist *prev;
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} *tail, *head; /* Of all lines of the input file that are
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* on the screen, remember how many
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* screenlines they occupy. Keep this
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* info in a doubly linked list.
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*/
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int nf; /* How many screenlines of the first line
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* on the screen are not on the screen?
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*/
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int currentpos; /* Y coordinate of first free line */
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struct linelist ssaavv; /* Mark */
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# define savfirst ssaavv.line
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# define savnf ssaavv.cnt
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};
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PUBLIC struct scr_info scr_info;
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PUBLIC int status; /* EOFILE on end of file
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* START on start of file
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* logical "or" if both
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*/
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/* Flags for status field */
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# define EOFILE 01
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# define START 02
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VOID redraw();
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/*
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* void redraw(flag)
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* int flag; Either 0 or 1
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*
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* Redraws the screen. If flag = 1, the screen is redrawn as precisely
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* as possible, otherwise one page is displayed (which possibly does not
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* take a whole screen.
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*/
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int display();
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/*
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* int display(firstline, nodispl, nlines, really)
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* long firstline; Line with which to start
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* int nodispl; Do not display nodispl lines of it
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* int nlines; Number of screen lines that must be displayed
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* int really; Either 0 or 1
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*
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* Displays nlines as a page. if "really" = 0, the actual displaying is not
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* performed. Only the computing associated with it is done.
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*/
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int scrollf();
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/*
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* int scrollf(nlines,really)
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* int nlines; Number of lines to scroll
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* int really; Either 0 or 1, see explanation above
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*
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* Scroll forwards "nlines" (screen)lines.
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*/
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int scrollb();
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/*
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* int scrollb(nlines,really)
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* int nlines; Number of lines to scroll
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* int really; Either 0 or 1, see explanation above
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*
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* Scroll backwards "nlines" (screen)lines.
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*/
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int tomark();
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/*
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* int tomark(cnt)
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* long cnt; (Argument ignored)
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*
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* Display a page starting at the mark. If there was no
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* mark, display the first page of the file.
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* (There is always assumed to be a mark, the initial one is on the first page
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* of the file).
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*/
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int setmark();
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/*
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* int setmark(cnt)
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* long cnt; (Argument ignored)
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*
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* Sets a mark on the current page.
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* It returns nothing (but the address is taken ...)
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*/
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int exgmark();
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/*
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* int exgmark(cnt)
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* long cnt; (Argumewnt ignored)
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*
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* Sets the mark on the current page and displays the
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* previously marked page.
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*/
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VOID d_clean();
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/*
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* void d_clean()
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*
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* Clean up and initialize. To be called before displaying a new file
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*/
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# undef PUBLIC
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