/*
	環境変数領域操作関数(LsiC/HighC用)  by Y.Kurihara (Nifty PDC01620)
*/

#if  defined( __HIGHC__ )
	#define Fchar  _far unsigned char
	#define Fint   _far unsigned short
	#define FARPTR(seg,off) ( fp_dos+(unsigned)(seg)*16+(unsigned)(off) )
	extern  Fchar  *fp_dos;
	extern  Fchar  *fp_psp;
#endif

#if  defined( LSI_C )
	#define Fchar  unsigned char far
	#define Fint   unsigned int  far
	#define FARPTR(seg,off) \
		( (Fchar *)((unsigned long)(seg)*0x10000+(unsigned)(off)) )
#endif

#define PSP_parent(psp)  ( *(Fint *)FARPTR((psp),0x16) )
#define PSP_environ(psp) ( *(Fint *)FARPTR((psp),0x2c) )
#define MCB_mark(seg)    ( *(Fchar*)FARPTR((seg-1),0x00) )
#define MCB_owner(seg)   ( *(Fint *)FARPTR((seg-1),0x01) )
#define MCB_size(seg)    ( *(Fint *)FARPTR((seg-1),0x03) )
#define MCB_next(seg)    ( (unsigned)(seg)+MCB_size(seg)+1 )

int getpid( void );				/* プロセスIDを得る */
int getrpid( void );				/* rootのPSPを得る */
int getppid( void );				/* 親のPSPを得る */
int getcpid( void );				/* shellのPSPを得る */
int pspenv( int psp );				/* 環境変数領域を得る */
int envdel( char *var,int env );		/* 環境変数の削除 */
int envset( char *var,char *val,int env );	/* 環境変数の変更 */
char *envget( char *var,int env );		/* 環境変数の値を得る */
char *envpath( int env );			/* 環境からパス名を得る */