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#ifndef __GATE_SET_H
#define __GATE_SET_H

/*    set.h

      The following is a general-purpose set library originally developed
      by Hank Dietz and enhanced by Terence Parr to allow dynamic sets.
      Sets are now structs containing the #words in the set and
      a pointer to the actual set words.

      1987 by Hank Dietz
      Modified by:
            Terence Parr
            Purdue University
            October 1989

            Added ANSI prototyping Dec. 1992 -- TJP

#include "pcctscfg.h"

#ifdef NOT_USED /* SEE config.h */
/* Define usable bits per unsigned int word */
#ifdef PC
#define WORDSIZE 16
#define LogWordSize     4
#define     WORDSIZE 32
#define LogWordSize 5
#define BytesPerWord    sizeof(unsigned)

#define     SETSIZE(a) ((a).n<<LogWordSize)           /* Maximum items per set */
#define     MODWORD(x) ((x) & (WORDSIZE-1))           /* x % WORDSIZE */
#define     DIVWORD(x) ((x) >> LogWordSize)           /* x / WORDSIZE */
#define     nil   (~((unsigned) 0)) /* An impossible set member all bits on (big!) */

typedef struct _set {
                  unsigned int n;         /* Number of words in set */
                  unsigned *setword;
            } set;

#define set_init  {0, NULL}
#define set_null(a)     ((a).setword==NULL)

#define     NumBytes(x)       (((x)>>3)+1)                                    /* Num bytes to hold x */
#define     NumWords(x)       ((((unsigned)(x))>>LogWordSize)+1)  /* Num words to hold x */

/* M a c r o s */

/* make arg1 a set big enough to hold max elem # of arg2 */
#define set_new(a,_max) \
if (((a).setword=(unsigned *)calloc(NumWords(_max),BytesPerWord))==NULL) \
        fprintf(stderr, "set_new: Cannot allocate set with max of %d\n", _max); \
        (a).n = NumWords(_max);

#define set_free(a)                                                     \
      {if ( (a).setword != NULL ) free((char *)((a).setword));    \
      (a) = empty;}

#ifdef __USE_PROTOS
extern void set_size( unsigned );
extern unsigned int set_deg( set );
extern set set_or( set, set );
extern set set_and( set, set );
extern set set_dif( set, set );
extern set set_of( unsigned );
extern void set_ext( set *, unsigned int );
extern set set_not( set );
extern int set_equ( set, set );
extern int set_sub( set, set );
extern unsigned set_int( set );
extern int set_el( unsigned, set );
extern int set_nil( set );
extern char * set_str( set );
extern set set_val( register char * );
extern void set_orel( unsigned, set * );
extern void set_orin( set *, set );
extern void set_andin( set *, set );
extern void set_rm( unsigned, set );
extern void set_clr( set );
extern set set_dup( set );
extern void set_PDQ( set, register unsigned * );
extern unsigned *set_pdq( set );
extern void _set_pdq( set a, register unsigned *q );
extern unsigned int set_hash( set, register unsigned int );
extern void set_size();
extern unsigned int set_deg();
extern set set_or();
extern set set_and();
extern set set_dif();
extern set set_of();
extern void set_ext();
extern set set_not();
extern int set_equ();
extern int set_sub();
extern unsigned set_int();
extern int set_el();
extern int set_nil();
extern char * set_str();
extern set set_val();
extern void set_orel();
extern void set_orin();
extern void set_andin();
extern void set_rm();
extern void set_clr();
extern set set_dup();
extern void set_PDQ();
extern unsigned *set_pdq();
extern void _set_pdq();
extern unsigned int set_hash();

extern set empty;


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