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- /*
- ** rexxhost.library - ARexx host management support library
- **
- ** Copyright © 1990-1992 by Olaf `Olsen' Barthel
- ** All Rights Reserved
- */
-
- #include "rexxhost.h"
-
- /* The structure expected by the library loader (auto-init). */
-
- struct InitTable
- {
- ULONG it_DataSize; /* Data size to allocate. */
- APTR *it_FuncTable; /* Pointer to function table. */
- APTR it_DataInit; /* Pointer to data initializers (remember InitStruct?). */
- APTR it_InitFunc; /* The real library init function. */
- };
-
- /* Protos for this module. */
-
- struct RexxHostBase * __saveds __asm LibInit(register __d0 struct RexxHostBase *RexxHostBase,register __a0 BPTR SegList);
- struct RexxHostBase * __saveds __asm LibOpen(register __a6 struct RexxHostBase *RexxHostBase);
- BPTR __saveds __asm LibClose(register __a6 struct RexxHostBase *RexxHostBase);
- BPTR __saveds __asm LibExpunge(register __a6 struct RexxHostBase *RexxHostBase);
-
- /* Pointer to library segment list. */
-
- BPTR LibSegList;
-
- /* ASCII library ID. */
-
- UBYTE __aligned LibName[] = "rexxhost.library";
- UBYTE __aligned LibID[] = VSTRING;
-
- /* File version string. */
-
- STATIC UBYTE VersionTag[] = VERSTAG;
-
- /* Global library base IDs. */
-
- struct RxsLib *RexxSysBase;
- struct ExecBase *SysBase;
-
- /* The list of library functions. */
-
- APTR __aligned LibFuncTab[] =
- {
- LibOpen, /* Standard library routines. */
- LibClose,
- LibExpunge,
- NULL,
-
- CreateRexxHost, /* Now for the real stuff. */
- DeleteRexxHost,
- SendRexxCommand,
- FreeRexxCommand,
- ReplyRexxCommand,
- GetRexxCommand,
- GetRexxArg,
- GetRexxResult1,
- GetRexxResult2,
- GetToken,
- GetStringValue,
- BuildValueString,
- RexxStrCmp,
- GetRexxMsg,
- SendRexxMsg,
- GetRexxString,
- GetRexxClip,
-
- (APTR)-1 /* End marker. */
- };
-
- /* The romtag needs this. */
-
- struct InitTable LibInitTab =
- {
- sizeof(struct RexxHostBase), /* Lib base. */
- LibFuncTab, /* Function table. */
- NULL, /* No data init table (we'll do autoinit). */
- LibInit /* Lib init routine. */
- };
-
- /* LibInit(RexxHostBase,SegList):
- *
- * Does the main library initialization, expects
- * all arguments in registers.
- */
-
- struct RexxHostBase * __saveds __asm
- LibInit(register __d0 struct RexxHostBase *RexxHostBase,register __a0 BPTR SegList)
- {
- SysBase = *(struct ExecBase **)4;
-
- /* Remember segment list. */
-
- LibSegList = SegList;
-
- /* Fill in the library node head. */
-
- RexxHostBase -> LibNode . lib_Node . ln_Type = NT_LIBRARY;
- RexxHostBase -> LibNode . lib_Node . ln_Name = LibName;
-
- /* Set the remaining flags. */
-
- RexxHostBase -> LibNode . lib_Flags = LIBF_SUMUSED | LIBF_CHANGED;
- RexxHostBase -> LibNode . lib_Version = VERSION;
- RexxHostBase -> LibNode . lib_Revision = REVISION;
- RexxHostBase -> LibNode . lib_IdString = (APTR)LibID;
-
- /* Return the result (surprise!). */
-
- return(RexxHostBase);
- }
-
- /* LibOpen():
- *
- * Library open routine.
- */
-
- struct RexxHostBase * __saveds __asm
- LibOpen(register __a6 struct RexxHostBase *RexxHostBase)
- {
- if(!RexxHostBase -> LibNode . lib_OpenCnt)
- {
- if(!(RexxHostBase -> RexxSysBase = RexxSysBase = (struct RxsLib *)OpenLibrary(RXSNAME,0)))
- return(NULL);
- }
-
- /* Increment open count and prevent delayed
- * expunges.
- */
-
- RexxHostBase -> LibNode . lib_OpenCnt++;
- RexxHostBase -> LibNode . lib_Flags &= ~LIBF_DELEXP;
-
- /* Return base pointer. */
-
- return(RexxHostBase);
- }
-
- /* LibClose():
- *
- * Closes the library.
- */
-
- BPTR __saveds __asm
- LibClose(register __a6 struct RexxHostBase *RexxHostBase)
- {
- BPTR SegList = ZERO;
-
- /* Is the library user count ok? */
-
- if(RexxHostBase -> LibNode . lib_OpenCnt)
- {
- /* Decrement user count. */
-
- RexxHostBase -> LibNode . lib_OpenCnt--;
-
- /* Try the expunge. */
-
- SegList = LibExpunge(RexxHostBase);
- }
- else
- {
- /* One close request after the lib has already
- * shut down? We'll call Mr. Guru.
- */
-
- Alert(AT_Recovery | AG_CloseLib,RexxHostBase);
- }
-
- /* Return the segment list, ramlib will know
- * what to do with it.
- */
-
- return(SegList);
- }
-
- /* LibExpunge(RexxHostBase):
- *
- * Expunge library, careful: this can be called by
- * ramlib without the rest of the library knowing
- * about it.
- */
-
- BPTR __saveds __asm
- LibExpunge(register __a6 struct RexxHostBase *RexxHostBase)
- {
- BPTR SegList = ZERO;
-
- /* Is the user count zero, the delayed expunge flag
- * set and do we have a valid segment list?
- */
-
- if(!RexxHostBase -> LibNode . lib_OpenCnt && (RexxHostBase -> LibNode . lib_Flags & LIBF_DELEXP) && LibSegList)
- {
- /* Remember segment list. */
-
- SegList = LibSegList;
-
- /* Set real segment list to zero which will
- * hopefully keep us from getting expunged
- * twice.
- */
-
- LibSegList = ZERO;
-
- /* Remove library from lib list. */
-
- Remove(&RexxHostBase -> LibNode . lib_Node);
-
- /* Close the libraries. */
-
- if(RexxSysBase)
- CloseLibrary(RexxSysBase);
-
- /* Free library/jump table memory. */
-
- FreeMem((BYTE *)((ULONG)RexxHostBase - RexxHostBase -> LibNode . lib_NegSize),RexxHostBase -> LibNode . lib_NegSize + RexxHostBase -> LibNode . lib_PosSize);
- }
- else
- {
- /* In any other case we'll set the delayed
- * expunge flag (so next expunge call will
- * hopefully wipe us from the lib list).
- */
-
- RexxHostBase -> LibNode . lib_Flags |= LIBF_DELEXP;
- }
-
- /* Return segment list pointer. */
-
- return(SegList);
- }
-