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CU Amiga Super CD-ROM 17
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CU Amiga Magazine's Super CD-ROM 17 (1997)(EMAP Images)(GB)[!][issue 1997-12].iso
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CUCD
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Programming
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DiceSource
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src
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dicecache
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lib.c
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C/C++ Source or Header
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1997-09-09
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4KB
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176 lines
/*
* (c)Copyright 1992-1997 Obvious Implementations Corp. Redistribution and
* use is allowed under the terms of the DICE-LICENSE FILE,
* DICE-LICENSE.TXT.
*/
/*
* LIB.C
*
* Basic Library Resource Handling
*
* NOTE: all data declarations should be initialized since we skip
* normal C startup code (unless initial value is don't care)
*/
#include "defs.h"
#include <exec/tasks.h>
#include <dos/dosextens.h>
typedef struct CommandLineInterface CLI;
Prototype LibCall Library *LibInit(long);
Prototype LibCall Library *LibOpen(long, Library *);
Prototype LibCall long LibClose(long, Library *);
Prototype LibCall long LibExpunge(long, Library *);
Prototype char *CallTaskName(void);
Prototype Library *LibBase;
Library *LibBase = NULL; /* Library Base pointer */
long SegList = 0;
long SysBase = NULL;
struct DosLibrary *DOSBase = NULL;
/*
* The Initialization routine is given only a seglist pointer. Since
* we are NOT AUTOINIT we must construct and add the library ourselves
* and return either NULL or the library pointer. Exec has Forbid()
* for us during the call.
*
* If you have an extended library structure you must specify the size
* of the extended structure in MakeLibrary().
*/
LibCall Library *
LibInit(segment)
long segment;
{
Library *lib;
static const long Vectors[] = {
(long)ALibOpen,
(long)ALibClose,
(long)ALibExpunge,
(long)NULL,
(long)DiceCacheOpen,
(long)DiceCacheClose,
(long)DiceCacheSeek,
(long)DiceCacheGetSuffixes,
(long)DiceCacheAddSuffix,
(long)DiceCacheRemSuffix,
(long)DiceCacheFlush,
(long)DiceCacheSet,
(long)DiceCacheGet,
(long)DiceCacheEnable,
(long)DiceCacheDisable,
-1
};
SysBase = *(long *)4;
DOSBase = (struct DosLibrary *)OpenLibrary("dos.library", 0);
LibBase = lib = MakeLibrary((APTR)Vectors,NULL,NULL,sizeof(Library),NULL);
lib->lib_Node.ln_Type = NT_LIBRARY;
lib->lib_Node.ln_Name = LibName;
lib->lib_Flags = LIBF_CHANGED|LIBF_SUMUSED;
lib->lib_Version = 37;
lib->lib_Revision = 5;
lib->lib_IdString = (APTR)LibId;
SegList = segment;
AddLibrary(lib);
InitC();
return(lib);
}
/*
* Open is given the library pointer and the version request. Either
* return the library pointer or NULL. Remove the DELAYED-EXPUNGE flag.
* Exec has Forbid() for us during the call.
*/
LibCall Library *
LibOpen(version, lib)
Library *lib;
long version;
{
++lib->lib_OpenCnt;
lib->lib_Flags &= ~LIBF_DELEXP;
return(lib);
}
/*
* Close is given the library pointer and the version request. Be sure
* not to decrement the open count if already zero. If the open count
* is or becomes zero AND there is a LIBF_DELEXP, we expunge the library
* and return the seglist. Otherwise we return NULL.
*
* Note that this routine never sets LIBF_DELEXP on its own.
*
* Exec has Forbid() for us during the call.
*/
LibCall long
LibClose(dummy, lib)
long dummy;
Library *lib;
{
if (lib->lib_OpenCnt && --lib->lib_OpenCnt)
return(NULL);
if (lib->lib_Flags & LIBF_DELEXP)
return(LibExpunge(0, lib));
return(NULL);
}
/*
* We expunge the library and return the Seglist ONLY if the open count
* is zero. If the open count is not zero we set the DELAYED-EXPUNGE
* flag and return NULL.
*
* Exec has Forbid() for us during the call. NOTE ALSO that Expunge
* might be called from the memory allocator and thus we CANNOT DO A
* Wait() or otherwise take a long time to complete (straight from RKM).
*
* Apparently RemLibrary(lib) calls our expunge routine and would
* therefore freeze if we called it ourselves. As far as I can tell
* from RKM, LibExpunge(lib) must remove the library itself as shown
* below.
*/
LibCall long
LibExpunge(dummy, lib)
long dummy;
Library *lib;
{
ObtainSemaphore(&SemLock);
if (lib->lib_OpenCnt) {
lib->lib_Flags |= LIBF_DELEXP;
return(NULL);
}
Remove(&lib->lib_Node);
UnInitC();
FreeMem((char *)lib-lib->lib_NegSize, lib->lib_NegSize+lib->lib_PosSize);
if (DOSBase) {
CloseLibrary((Library *)DOSBase);
DOSBase = NULL;
}
ReleaseSemaphore(&SemLock);
return((long)SegList);
}
char *
CallTaskName()
{
struct Process *proc = (struct Process *)FindTask(NULL);
if (proc->pr_CLI) {
char *ptr = (char *)(((CLI *)(proc->pr_CLI << 2))->cli_CommandName << 2);
return(ptr + 1);
}
return(proc->pr_Task.tc_Node.ln_Name);
}