/* #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 || MCH_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 MCH_AMIGA
#undef NULL
#  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 || MCH_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 MCH_AMIGA
   void Check_Abort ();
   extern short 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 /* MCH_AMIGA */

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

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