usr/src/usr.bin/tn3270/ctlr/screen.h

/*
 *      @(#)screen.h    3.1  10/29/86
 */

#define INCLUDED_SCREEN

/* defines and defines to describe how to deal with the screen */

#if     !defined(MSDOS)
#define MAXNUMBERLINES          43              /* 3278-4 */
#define MAXNUMBERCOLUMNS        132             /* 3278-5 */
#define MAXSCREENSIZE           3564            /* (27*132) 3278-5 */
#else   /* !defined(MSDOS) */   /* MSDOS has memory constraints */
#define MAXNUMBERLINES          25              /* XXX */
#define MAXNUMBERCOLUMNS        80
#define MAXSCREENSIZE           (MAXNUMBERLINES*MAXNUMBERCOLUMNS)
#endif  /* !defined(MSDOS) */   /* MSDOS has memory constraints */
#define LowestScreen()  0
#define HighestScreen() (ScreenSize-1)

#define ScreenLineOffset(x)     ((x)%NumberColumns)
#define ScreenLine(x)   ((int)((x)/NumberColumns))
#define ScreenInc(x)    (((x)==HighestScreen())? LowestScreen():x+1)
#define ScreenDec(x)    (((x)==LowestScreen())? HighestScreen():x-1)
#define ScreenUp(x)     (((x)+(ScreenSize-NumberColumns))%ScreenSize)
#define ScreenDown(x)   (((x)+NumberColumns)%ScreenSize)
#define IsOrder(x)      (Orders[x])
#define BAIC(x)         ((x)&0x3f)
#define CIAB(x)         (CIABuffer[(x)&0x3f])
#define BufferTo3270_0(x)       (CIABuffer[(int)((x)/0x40)])
#define BufferTo3270_1(x)       (CIABuffer[(x)&0x3f])
#define Addr3270(x,y)   (BAIC(x)*64+BAIC(y))
#define SetBufferAddress(x,y)   ((x)*NumberColumns+(y))
\f
/* These know how fields are implemented... */

#define WhereAttrByte(p)        (IsStartField(p)? p: FieldDec(p))
#define WhereHighByte(p)        ScreenDec(FieldInc(p))
#define WhereLowByte(p)         ScreenInc(WhereAttrByte(p))
#define FieldAttributes(x)      (IsStartField(x)? GetHost(x) : \
                                    GetHost(WhereAttrByte(x)))
#define FieldAttributesPointer(p)       (IsStartFieldPointer(p)? \
                                    GetHostPointer(p): \
                                    GetHost(WhereAttrByte((p)-&Host[0])))
#define TurnOffMdt(x)   ModifyHost(WhereAttrByte(x), &= ~ATTR_MDT)
#define TurnOnMdt(x)    ModifyHost(WhereAttrByte(x), |= ATTR_MDT)
#define HasMdt(x)       (GetHost(x)&ATTR_MDT)   /* modified tag */

        /*
         * Is the screen formatted?  Some algorithms change depending
         * on whether there are any attribute bytes lying around.
         */
#define FormattedScreen() \
            ((WhereAttrByte(0) != 0) || ((GetHost(0)&ATTR_MASK) == ATTR_MASK))

                                            /* field starts here */
#define IsStartField(x) ((GetHost(x)&ATTR_MASK) == ATTR_MASK)
#define IsStartFieldPointer(p)  ((GetHostPointer(p)&ATTR_MASK) == ATTR_MASK)

#define NewField(p,a)   SetHost(p, (a)|ATTR_MASK)
#define DeleteField(p)  SetHost(p, 0)
#define DeleteAllFields()
\f
/* The following are independent of the implementation of fields */
#define IsProtectedAttr(p,a)    (IsStartField(p) || ((a)&ATTR_PROT))
#define IsProtected(p)  IsProtectedAttr(p,FieldAttributes(p))

#define IsUnProtected(x)        (!IsProtected(x))

#define IsAutoSkip(x)   (FieldAttributes(x)&ATTR_AUTO_SKIP)

#define IsNonDisplayAttr(c)     (((c)&ATTR_DSPD_MASK) == ATTR_DSPD_NONDISPLAY)
#define IsNonDisplay(p) IsNonDisplayAttr(FieldAttributes(p))

#define IsHighlightedAttr(c) \
                (((c)&ATTR_DSPD_MASK) == ATTR_DSPD_HIGH)
#define IsHighlighted(p) \
                (IsHighlightedAttr(FieldAttributes(p)) && !IsStartField(p))


#define MAX(x,y)        ((x)<(y)? (y):(x))
#define MIN(x,y)        ((x)<(y)? x:(y))

typedef unsigned char ScreenImage;

extern int
        FieldFind();

extern char
        CIABuffer[];

#define GetGeneric(i,h)         (h)[i]
#define GetGenericPointer(p)    (*(p))
#define SetGeneric(i,c,h)       ((h)[i] = (c))
#define ModifyGeneric(i,what,h) {(h)[i] what;}

#define GetHost(i)              GetGeneric(i,Host)
#define GetHostPointer(p)       GetGenericPointer(p)
#define SetHost(i,c)            SetGeneric(i,c,Host)
#define ModifyHost(i,what)      ModifyGeneric(i,what,Host)