minix/commands/yap/display.h

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2005-04-21 16:53:53 +02:00
/* Copyright (c) 1985 Ceriel J.H. Jacobs */
/* $Header$ */
# ifndef _DISPLAY_
# define PUBLIC extern
# else
# define PUBLIC
# endif
# define MINPAGESIZE 5
PUBLIC int pagesize; /* How many lines on a page */
PUBLIC int maxpagesize; /* Maximum # of lines on a page */
PUBLIC int scrollsize; /* number of lines in a scroll */
struct scr_info {
struct linelist {
int cnt; /* # of screenlines for this line */
long line; /* lineno of this line */
# define firstline head->line
# define lastline tail->line
struct linelist *next;
struct linelist *prev;
} *tail, *head; /* Of all lines of the input file that are
* on the screen, remember how many
* screenlines they occupy. Keep this
* info in a doubly linked list.
*/
int nf; /* How many screenlines of the first line
* on the screen are not on the screen?
*/
int currentpos; /* Y coordinate of first free line */
struct linelist ssaavv; /* Mark */
# define savfirst ssaavv.line
# define savnf ssaavv.cnt
};
PUBLIC struct scr_info scr_info;
PUBLIC int status; /* EOFILE on end of file
* START on start of file
* logical "or" if both
*/
/* Flags for status field */
# define EOFILE 01
# define START 02
VOID redraw();
/*
* void redraw(flag)
* int flag; Either 0 or 1
*
* Redraws the screen. If flag = 1, the screen is redrawn as precisely
* as possible, otherwise one page is displayed (which possibly does not
* take a whole screen.
*/
int display();
/*
* int display(firstline, nodispl, nlines, really)
* long firstline; Line with which to start
* int nodispl; Do not display nodispl lines of it
* int nlines; Number of screen lines that must be displayed
* int really; Either 0 or 1
*
* Displays nlines as a page. if "really" = 0, the actual displaying is not
* performed. Only the computing associated with it is done.
*/
int scrollf();
/*
* int scrollf(nlines,really)
* int nlines; Number of lines to scroll
* int really; Either 0 or 1, see explanation above
*
* Scroll forwards "nlines" (screen)lines.
*/
int scrollb();
/*
* int scrollb(nlines,really)
* int nlines; Number of lines to scroll
* int really; Either 0 or 1, see explanation above
*
* Scroll backwards "nlines" (screen)lines.
*/
int tomark();
/*
* int tomark(cnt)
* long cnt; (Argument ignored)
*
* Display a page starting at the mark. If there was no
* mark, display the first page of the file.
* (There is always assumed to be a mark, the initial one is on the first page
* of the file).
*/
int setmark();
/*
* int setmark(cnt)
* long cnt; (Argument ignored)
*
* Sets a mark on the current page.
* It returns nothing (but the address is taken ...)
*/
int exgmark();
/*
* int exgmark(cnt)
* long cnt; (Argumewnt ignored)
*
* Sets the mark on the current page and displays the
* previously marked page.
*/
VOID d_clean();
/*
* void d_clean()
*
* Clean up and initialize. To be called before displaying a new file
*/
# undef PUBLIC