Initial revision: imported RGBDS source code

The code comes from the RGBDS source and documentation zip files found
on this website:

http://www.otakunozoku.com/1999/08/01/rednex-gameboy-development-system/

The same website reports:

	"Best of all, it’s free! That’s right! Free! The executables
	are free to use, either for personal hobby use, or full blown
	commercial productions — I know of at least a dozen commercial
	games you can purchase that are written with RGBDS — and the
	source code is free to modify.

	"The only thing I ask is that you do not charge for either
	distributing the executables or source code, and any derivative
	works you give credit to the original authors of the tools.
	That means you have to say “Thanks” to the original authors
	SurfSmurf and Otaku."

Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>

src/LINK/INCLUDE/ASSIGN.H

@@ -0,0 +1,22 @@
+#ifndef	ASSIGN_H
+#define	ASSIGN_H
+
+#include	"types.h"
+
+enum	eBankDefine
+{
+	BANK_HOME=0,
+	BANK_BSS=256,
+	BANK_VRAM,
+	BANK_HRAM
+};
+
+#define	MAXBANKS	259
+
+extern	SLONG	area_Avail( SLONG bank );
+extern	void	AssignSections( void );
+extern	void	CreateSymbolTable( void );
+extern	SLONG	MaxBankUsed;
+extern	SLONG	MaxAvail[MAXBANKS];
+
+#endif

src/LINK/INCLUDE/LIBRARY.H

@@ -0,0 +1,6 @@
+#ifndef	LIBRARY_H
+#define	LIBRARY_H
+
+extern	void	AddNeededModules( void );
+
+#endif

src/LINK/INCLUDE/MAIN.H

@@ -0,0 +1,21 @@
+#ifndef	MAIN_H
+#define	MAIN_H
+
+#include	"types.h"
+
+extern	void	PrintUsage( void );
+extern	void	fatalerror( char *s );
+extern	char	temptext[1024];
+extern	SLONG	fillchar;
+extern	char	smartlinkstartsymbol[256];
+
+enum	eOutputType
+{
+	OUTPUT_GBROM,
+	OUTPUT_PSION2
+};
+
+extern	enum	eOutputType	outputtype;
+
+
+#endif

src/LINK/INCLUDE/MAPFILE.H

@@ -0,0 +1,11 @@
+#ifndef	MAPFILE_H
+#define	MAPFILE_H
+
+extern	void	SetMapfileName( char *name );
+extern	void	SetSymfileName( char *name );
+extern	void	CloseMapfile( void );
+extern	void	MapfileWriteSection( struct sSection *pSect );
+extern	void	MapfileInitBank( SLONG bank );
+extern	void	MapfileCloseBank( SLONG slack );
+
+#endif

src/LINK/INCLUDE/MYLINK.H

@@ -0,0 +1,119 @@
+#ifndef LINK_H
+#define LINK_H 1
+
+#if defined(AMIGA) || defined(__GNUC__)
+#define	_MAX_PATH	512
+#endif
+
+#include	"types.h"
+
+extern	SLONG		options;
+#define	OPT_SMALL	0x01
+#define	OPT_SMART_C_LINK	0x02
+
+enum	eRpnData
+{
+	RPN_ADD=0,
+	RPN_SUB,
+	RPN_MUL,
+	RPN_DIV,
+	RPN_MOD,
+	RPN_UNSUB,
+
+	RPN_OR,
+	RPN_AND,
+	RPN_XOR,
+	RPN_UNNOT,
+
+	RPN_LOGAND,
+	RPN_LOGOR,
+	RPN_LOGUNNOT,
+
+	RPN_LOGEQ,
+	RPN_LOGNE,
+	RPN_LOGGT,
+	RPN_LOGLT,
+	RPN_LOGGE,
+	RPN_LOGLE,
+
+	RPN_SHL,
+	RPN_SHR,
+
+	RPN_BANK,
+
+	RPN_HRAM,
+
+	RPN_PCEZP,
+
+	RPN_RANGECHECK,
+
+	RPN_CONST=0x80,
+	RPN_SYM=0x81
+};
+
+enum eSectionType
+{
+	SECT_BSS,
+	SECT_VRAM,
+	SECT_CODE,
+	SECT_HOME,
+	SECT_HRAM
+};
+
+struct sSection
+{
+	SLONG	nBank;
+	SLONG	nOrg;
+	BBOOL	oAssigned;
+
+	SLONG	nByteSize;
+	enum	eSectionType	Type;
+	UBYTE	*pData;
+	SLONG	nNumberOfSymbols;
+	struct	sSymbol		**tSymbols;
+	struct	sPatch		*pPatches;
+	struct	sSection	*pNext;
+};
+
+enum	eSymbolType
+{
+	SYM_LOCAL,
+	SYM_IMPORT,
+	SYM_EXPORT
+};
+
+struct sSymbol
+{
+	char	*pzName;
+	enum	eSymbolType	Type;
+	/* the following 3 items only valid when Type!=SYM_IMPORT */
+	SLONG	nSectionID; /* internal to object.c */
+	struct	sSection	*pSection;
+	SLONG	nOffset;
+};
+
+enum	ePatchType
+{
+	PATCH_BYTE=0,
+	PATCH_WORD_L,
+	PATCH_LONG_L,
+	PATCH_WORD_B,
+	PATCH_LONG_B
+};
+
+struct sPatch
+{
+	char	*pzFilename;
+	SLONG	nLineNo;
+	SLONG	nOffset;
+	enum	ePatchType	Type;
+	SLONG	nRPNSize;
+	UBYTE	*pRPN;
+	struct	sPatch	*pNext;
+	BBOOL	oRelocPatch;
+};
+
+extern	struct	sSection	*pSections;
+extern	struct	sSection	*pLibSections;
+
+#endif

src/LINK/INCLUDE/OBJECT.H

@@ -0,0 +1,7 @@
+#ifndef	OBJECT_H
+#define	OBJECT_H
+
+extern	void	obj_Readfile( char *tzObjectfile );
+extern	void	lib_Readfile( char *tzLibfile );
+
+#endif

src/LINK/INCLUDE/OUTPUT.H

@@ -0,0 +1,7 @@
+#ifndef	OUTPUT_H
+#define	OUTPUT_H
+
+void	out_Setname( char *tzOutputfile );
+void	Output( void );
+
+#endif

src/LINK/INCLUDE/PATCH.H

@@ -0,0 +1,9 @@
+#ifndef	PATCH_H
+#define	PATCH_H
+
+#include	"types.h"
+
+void	Patch( void );
+extern	SLONG	nPC;
+
+#endif

src/LINK/INCLUDE/SYMBOL.H

@@ -0,0 +1,11 @@
+#ifndef	SYMBOL_H
+#define	SYMBOL_H
+
+#include	"types.h"
+
+void	sym_Init( void );
+void	sym_CreateSymbol( char *tzName, SLONG nValue, SBYTE nBank );
+SLONG	sym_GetValue( char *tzName );
+SLONG	sym_GetBank( char *tzName );
+
+#endif

src/LINK/INCLUDE/TYPES.H

@@ -0,0 +1,16 @@
+#ifndef TYPES_H
+#define TYPES_H 1
+
+#if	defined(AMIGA) || defined(__GNUC__)
+#define	_MAX_PATH	512
+#endif
+
+typedef unsigned char	UBYTE;
+typedef signed char		SBYTE;
+typedef unsigned short	UWORD;
+typedef signed short	SWORD;
+typedef unsigned long	ULONG;
+typedef signed long		SLONG;
+typedef signed char		BBOOL;
+
+#endif