xref: /original-bsd/usr.bin/tn3270/ctlr/screen.h (revision 1c07731d)
1 /*-
2  * Copyright (c) 1988, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * %sccs.include.redist.c%
6  *
7  *	@(#)screen.h	8.1 (Berkeley) 06/06/93
8  */
9 
10 #define	INCLUDED_SCREEN
11 
12 /* defines and defines to describe how to deal with the screen */
13 
14 #if	!defined(MSDOS)
15 #define	MAXNUMBERLINES		43		/* 3278-4 */
16 #define	MAXNUMBERCOLUMNS	132		/* 3278-5 */
17 #define	MAXSCREENSIZE		3564		/* (27*132) 3278-5 */
18 #else	/* !defined(MSDOS) */	/* MSDOS has memory constraints */
19 #define	MAXNUMBERLINES		25		/* XXX */
20 #define	MAXNUMBERCOLUMNS	80
21 #define	MAXSCREENSIZE		(MAXNUMBERLINES*MAXNUMBERCOLUMNS)
22 #endif	/* !defined(MSDOS) */	/* MSDOS has memory constraints */
23 #define LowestScreen()	0
24 #define HighestScreen()	(ScreenSize-1)
25 
26 #define ScreenLineOffset(x)	((x)%NumberColumns)
27 #define ScreenLine(x)	((int)((x)/NumberColumns))
28 #define ScreenInc(x)	(((x)==HighestScreen())? LowestScreen():x+1)
29 #define ScreenDec(x)	(((x)==LowestScreen())? HighestScreen():x-1)
30 #define ScreenUp(x)	(((x)+(ScreenSize-NumberColumns))%ScreenSize)
31 #define ScreenDown(x)	(((x)+NumberColumns)%ScreenSize)
32 #define	IsOrder(x)	(Orders[x])
33 #define BAIC(x)		((x)&0x3f)
34 #define CIAB(x)		(CIABuffer[(x)&0x3f])
35 #define BufferTo3270_0(x)	(CIABuffer[(int)((x)/0x40)])
36 #define BufferTo3270_1(x)	(CIABuffer[(x)&0x3f])
37 #define Addr3270(x,y)	(BAIC(x)*64+BAIC(y))
38 #define SetBufferAddress(x,y)	((x)*NumberColumns+(y))
39 
40 /* These know how fields are implemented... */
41 
42 #define WhereAttrByte(p)	(IsStartField(p)? p: FieldDec(p))
43 #define	WhereHighByte(p)	ScreenDec(FieldInc(p))
44 #define WhereLowByte(p)		ScreenInc(WhereAttrByte(p))
45 #define FieldAttributes(x)	(IsStartField(x)? GetHost(x) : \
46 				    GetHost(WhereAttrByte(x)))
47 #define FieldAttributesPointer(p)	(IsStartFieldPointer(p)? \
48 				    GetHostPointer(p): \
49 				    GetHost(WhereAttrByte((p)-&Host[0])))
50 
51 /*
52  * The MDT functions need to protect against the case where the screen
53  * is unformatted (sigh).
54  */
55 
56 /* Turn off the Modified Data Tag */
57 #define TurnOffMdt(x) \
58     if (HasMdt(WhereAttrByte(x))) { \
59 	ModifyMdt(x, 0); \
60     }
61 
62 /* Turn on the Modified Data Tag */
63 #define TurnOnMdt(x) \
64     if (!HasMdt(WhereAttrByte(x))) { \
65 	ModifyMdt(x, 1); \
66     }
67 
68 /* If this location has the MDT bit turned on (implies start of field) ... */
69 #define HasMdt(x) \
70     ((GetHost(x)&(ATTR_MDT|ATTR_MASK)) == (ATTR_MDT|ATTR_MASK))
71 
72 	/*
73 	 * Is the screen formatted?  Some algorithms change depending
74 	 * on whether there are any attribute bytes lying around.
75 	 */
76 #define	FormattedScreen() \
77 	    ((WhereAttrByte(0) != 0) || ((GetHost(0)&ATTR_MASK) == ATTR_MASK))
78 
79 					    /* field starts here */
80 #define IsStartField(x)	((GetHost(x)&ATTR_MASK) == ATTR_MASK)
81 #define IsStartFieldPointer(p)	((GetHostPointer(p)&ATTR_MASK) == ATTR_MASK)
82 
83 #define NewField(p,a)	SetHost(p, (a)|ATTR_MASK)
84 #define DeleteField(p)	SetHost(p, 0)
85 #define	DeleteAllFields()
86 
87 /* The following are independent of the implementation of fields */
88 #define IsProtectedAttr(p,a)	(IsStartField(p) || ((a)&ATTR_PROT))
89 #define IsProtected(p)	IsProtectedAttr(p,FieldAttributes(p))
90 
91 #define IsUnProtected(x)	(!IsProtected(x))
92 
93 #define IsAutoSkip(x)	(FieldAttributes(x)&ATTR_AUTO_SKIP)
94 
95 #define IsNonDisplayAttr(c)	(((c)&ATTR_DSPD_MASK) == ATTR_DSPD_NONDISPLAY)
96 #define	IsNonDisplay(p)	IsNonDisplayAttr(FieldAttributes(p))
97 
98 #define IsHighlightedAttr(c) \
99 		(((c)&ATTR_DSPD_MASK) == ATTR_DSPD_HIGH)
100 #define	IsHighlighted(p) \
101 		(IsHighlightedAttr(FieldAttributes(p)) && !IsStartField(p))
102 
103 typedef unsigned char ScreenImage;
104 
105 extern int
106 	FieldFind();
107 
108 extern char
109 	CIABuffer[];
110 
111 #define	GetGeneric(i,h)		(h)[i]
112 #define	GetGenericPointer(p)	(*(p))
113 #define	SetGeneric(i,c,h)	((h)[i] = (c))
114 #define	ModifyGeneric(i,what,h)	{(h)[i] what;}
115 
116 #define GetHost(i)		GetGeneric(i,Host)
117 #define GetHostPointer(p)	GetGenericPointer(p)
118 #define	SetHost(i,c)		SetGeneric(i,c,Host)
119 #define	ModifyHost(i,what)	ModifyGeneric(i,what,Host)
120