/* #define	VAXVMS	1 */		/* uncomment for VAX/VMS */
/* #define	MSDOS	1 */		/* uncomment for MSDOS */

/* NOTE: other two supported systems, "unix" and "AMIGA" have these symbols */
/* built into the preprocessor.  Redefining them may cause problems, or at */
/* least irritating warning messages. */

#if VAXVMS
#  define ESCCHAR `\\`		/* ok to use backslash on VMS */
#endif

#ifdef MSDOS
#  define ESCCHAR '`'		/* since pathname char is backslash (yech) */
#endif

#if unix || AMIGA
#  define ESCCHAR '\\'
#endif

#define EOS '\000'		/* End of string character */

#define	MACCHAR '$'		/* macro-definition char */
#define	COMCHAR	'#'		/* comment char */
#define	DEFMAC	"="		/* macro-definition token */
#define	DEPEND	":"		/* dependency-definition token */

#ifdef FUNNYLIBS
#  define BGNLIB  "["		/* start library token */
#  define ENDLIB  "]"		/* end library token */
#else
#  define ISLIB   "|"		/* Library definition token */
#endif

#define BGNARC  "("		/* start archive token */
#define ENDARC  ")"		/* end archive token */

#define	DEBUG	(0)
#define	STRSIZ	(1024)		/* Size of input buffer */
#define	MAXMODS	(50)		/* Max number of targets on command line */
#define MAXCMDMACS (16)		/* Max number of macro defs on command line */

#if DEBUG
#  define NOREALEXECUTE		/* if set, don't really execute commands */
#  define NOREALEXTRACT		/* if set, don't really extract files */
#  define NOREALDELETE		/* if set, don't really delete files */
#endif

#define SUCCEED (0)
#define FAILURE (-1)

/* file attributes */

#define	REBUILT	0x01		/* file has been reconstructed */
#define	ROOTP	0x02		/* file was named on left side of DEPEND */
#define LIBRARY 0x04		/* file is library; inherit parent's time */
#define ARCHIVE 0x08		/* file is archive; search through parent */
				/* archive directory for time */
#define EXTRACT 0x10		/* extract from archive when rebuilding */
#define ERROR   0x20		/* error occurred while rebuilding */

#ifdef VAXVMS
struct date_str {
    unsigned ds_low;
    unsigned ds_high;
};
typedef struct date_str *DATE;
#endif

#ifdef MSDOS
#  ifndef FA_ARCH
#    include <bdos.h>
#  endif
   typedef struct ftime *DATE;
#endif

#ifdef unix
  typedef long *DATE;
#endif

#ifdef AMIGA
#  include <libraries/dos.h>
   typedef struct DateStamp *DATE;
#endif

#ifdef DBUG
#  include <local/dbug.h>
#else
#  define DBUG_ENTER(a1)
#  define DBUG_RETURN(a1) return(a1)
#  define DBUG_VOID_RETURN return
#  define DBUG_EXECUTE(keyword,a1)
#  define DBUG_2(keyword,format)
#  define DBUG_3(keyword,format,a1)
#  define DBUG_4(keyword,format,a1,a2)
#  define DBUG_5(keyword,format,a1,a2,a3)
#  define DBUG_PUSH(a1)
#  define DBUG_POP()
#  define DBUG_PROCESS(a1)
#  define DBUG_FILE (stderr)
#  define DBUG_SETJMP setjmp
#  define DBUG_LONGJMP longjmp
#endif

struct node {
    struct filenode *nfile;	/* this node's file */
    struct node *nnext;		/* the next node */
};
typedef struct node NODE;


struct filenode {
    char *fname;		/* the filename */
    char *fmake;		/* remake string for file */
    DATE fdate;			/* last modification date */
    NODE *fnode;		/* files this file depends on */
    char fflag;			/* magic flag bits */
    struct filenode *parent;	/* pointer to parent for archives,libraries */
    struct filenode *fnext;	/* the next file */
};
typedef struct filenode FILENODE;


struct macro {
    char *mname;		/* the macro's name */
    char *mvalue;		/* the macro's definition */
    struct macro *mnext;	/* the next macro */
};
typedef struct macro MACRO;


extern long *Calloc ();		/* Private gateway to system calloc() */
extern MACRO *mroot;
extern FILENODE *froot;
extern DATE bigbang;		/* Far, far in the past */
extern DATE endoftime;		/* Far, far in the future */
char *gmacro ();
FILENODE *gfile ();
FILENODE *filenode ();
char *token ();

#if unix || AMIGA
#  define _open open
#  define _close close
#  define _read read
#  define _write write
#endif

/*
 *	On the Amiga, we must do an explicit check for an abort at various
 *	places of interest.  To avoid #ifdefs all through the code, define
 *	some macros that just expand to null on other systems.
 *
 */
 
#ifdef AMIGA
   void Check_Abort ();
   extern int Enable_Abort;			/* Enable abort on CNTL-C */
#  define ENABLE_ABORT (Enable_Abort = 1)
#  define DISABLE_ABORT (Enable_Abort = 0)
#  define CHECK_ABORT Check_Abort();
#else
#  define CHECK_ABORT				/* Null expansions */
#  define ENABLE_ABORT
#  define DISABLE_ABORT
#endif	/* AMIGA */

/*
 *	Some useful macros to make things slightly less error prone.
 */

#define STRSAME(a,b) (strcmp(a,b)==0)		/* Strings are the same */