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uni.h
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1994-10-16
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/*
* Definition of the UniTerm parameter block
* Donated to the Public Domain by Simon Poole
*/
/* These definitions assume:
* - int : 16 bits
* - long : 32 bits
* - pointer : 32 bits
* - struct fields are ordered from low to high
* memory, without any additional alignment
* bytes (PBLength is at the lowest address,
* PBClipAddress at the highest)
*/
typedef struct {
long ClipLen; /* current length of clip */
char *ClipBuffer; /* pointer to the buffer itsself */
} ClipStruct; /* UniTerm's clipboard */
typedef struct {
int PBLength; /* size of parameter block, currently 54 */
long PBFlags; /* reserved for future expansion */
long PBTextScreen; /* address of the screen in text mode */
long PBGraphScreen; /* address of the graphic screen (if allocated) */
long PBScreenBuffer; /* address of buffer for screen operations 32'000 bytes */
char *PBTransBuffer; /* pointer to buffer used for file transfer */
long PBTransSize; /* size of above buffer */
long PBTransPtrAdr; /* current position in the buffer */
char *PBHistBuffer; /* pointer to history buffer */
long PBHistSize; /* size of above buffer */
long *PBHistBotAdr; /* pointer to the address (NOT offset) of current hist. bottom */
long *PBHistPtrAdr; /* pointer to the address (NOT offset) of current hist. top */
long PBClipSize; /* maximum size of clipboard */
ClipStruct *PBClipRecAdr; /* pointer to the clipboard structure */
} UniStruct; /* UniTerm's parameter block */
/*
* When a program is started, the current screen is either PBTextScreen
* or PBGraphScreen, a copy of the contents of that screen is in
* PBScreenBuffer.
*
* For historical reasons the addresses pointed to by PBHistBotAdr and
* PBHistPtrAdr are not offsets from PBHistBuffer, but are absolute
* memory addresses.
*
* New fields will be added at the end of the parameter block, so the
* application only has to check PBLength to see if a field is present
* or not.
*/