www.pudn.com > PocketC.zip > PocketCLibDispatch.cpp

// Define this so we don't use the PalmPilot pre-compiled headers. 
// We can't use them here because we re-define some build options 
#ifndef PILOT_PRECOMPILED_HEADERS_OFF 
#define	PILOT_PRECOMPILED_HEADERS_OFF 
#endif 
 
// Define EMULATION_LEVEL.  __PALMOS_TRAPS__ was pre-defined by MW C Compiler 
// Test it before we blow it away so we can properly define EMULATION_LEVEL. 
#if __PALMOS_TRAPS__ 
	#define EMULATION_LEVEL		EMULATION_NONE		// building Pilot executable 
#endif 
 
// Now clear __PALMOS_TRAPS__ and define USE_TRAPS so headers do the right thing 
// That is, we need to be able to get the addresses of SampleLibrary routines. 
// Other modules will access the routines through traps. 
#undef __PALMOS_TRAPS__ 
#define __PALMOS_TRAPS__ 	0 
#define	USE_TRAPS 	0 
 
 
// Include Pilot headers 
#include "PocketCLib.h" 
 
#if EMULATION_LEVEL == EMULATION_NONE 
	#define PocketCLibInstall   __Startup__ 
#endif 
 
 
// Local prototypes 
extern "C" Err PocketCLibInstall(UInt16 refNum, SysLibTblEntryPtr entryP); 
static asm void*  PocketCLibDispatchTable(void); 
 
 
Err PocketCLibInstall(UInt16 refNum, SysLibTblEntryPtr entryP) { 
	// Install pointer to our dispatch table 
	entryP->dispatchTblP = (void**)PocketCLibDispatchTable(); 
	 
	// Initialize globals pointer to zero (we will set up our library 
	// globals in the library "open" call). 
	entryP->globalsP = 0; 
 
	return 0; 
} 
 
// First, define the size of the jump instruction 
#if EMULATION_LEVEL == EMULATION_NONE 
	#define prvJmpSize		4 
#elif EMULATION_LEVEL == EMULATION_MAC 
	#define prvJmpSize		6 
#else 
	#error unsupported emulation mode 
#endif	// EMULATION_LEVEL... 
 
// Now, define a macro for offset list entries 
#define libDispatchEntry(index)		(kOffset+((index)*prvJmpSize)) 
 
 
// Finally, define the size of the dispatch table's offset list -- 
// it is equal to the size of each entry (which is presently 2 bytes) times 
// the number of entries in the offset list (***including the @Name entry***). 
// 
#define	kOffset		(2*7)						// NOTE: This is NOT empirical for PocketC libs!!!!!! 
 
static asm void* PocketCLibDispatchTable(void) 
{ 
	LEA		@Table, A0 
	RTS 
 
@Table: 
	// Offset to library name 
	DC.W		@Name 
 
	// Standard traps 
	DC.W		libDispatchEntry(0)					// Open 
	DC.W		libDispatchEntry(1)					// Close 
	DC.W		libDispatchEntry(2)					// Sleep 
	DC.W		libDispatchEntry(3)					// Wake 
	 
	// Start of the Custom traps 
	DC.W		libDispatchEntry(4)					// AddFunctions 
	DC.W		libDispatchEntry(5)					// ExecuteFunction 
 
// Standard library function handlers 
@GotoOpen: 
	JMP 		PocketCLibOpen 
@GotoClose: 
	JMP 		PocketCLibClose 
@GotoSleep: 
	JMP 		PocketCLibSleep 
@GotoWake: 
	JMP 		PocketCLibWake 
	 
// Customer library function handlers 
@GotoAddFuncs: 
	JMP 		PocketCLibAddFunctions 
@GotoExecFuncs: 
	JMP 		PocketCLibExecuteFunction 
	 
@Name: 
 
	// 
	// TODO: Change the library name 
	// 
	 
	DC.B		"PocketClib" 
}