24ddc71998-03-28Henrik Grubbström (Grubba) #include "global.h"
fc33451997-10-02Fredrik Hübinette (Hubbe) #include "cyclic.h"
14bb592000-05-06Fredrik Hübinette (Hubbe) RCSID("$Id: cyclic.c,v 1.4 2000/05/07 00:39:17 hubbe Exp $");
24ddc71998-03-28Henrik Grubbström (Grubba) 
fc33451997-10-02Fredrik Hübinette (Hubbe) #define CYCLIC_HASH_SIZE 4711 CYCLIC *cyclic_hash[CYCLIC_HASH_SIZE];
545ca81997-10-07Fredrik Hübinette (Hubbe) static void low_unlink_cyclic(CYCLIC *c)
fc33451997-10-02Fredrik Hübinette (Hubbe) { unsigned int h; CYCLIC **p; h=(int)c->id; h*=33; h|=(int)c->a; h*=33; h|=(int)c->b; h*=33; h|=(int)c->th; h*=33; h%=CYCLIC_HASH_SIZE; for(p=cyclic_hash+h;*p;p=&(p[0]->next)) { if(c == *p) { *p=c->next; return; } } fatal("Unlink cyclic on lost cyclic struct.\n"); }
545ca81997-10-07Fredrik Hübinette (Hubbe) void unlink_cyclic(CYCLIC *c) { UNSET_ONERROR(c->onerr); low_unlink_cyclic(c); }
fc33451997-10-02Fredrik Hübinette (Hubbe) void *begin_cyclic(CYCLIC *c, void *id, void *th, void *a, void *b) { unsigned int h;
14bb592000-05-06Fredrik Hübinette (Hubbe)  void *ret=0;
fc33451997-10-02Fredrik Hübinette (Hubbe)  CYCLIC *p; h=(int)id; h*=33; h|=(int)a; h*=33; h|=(int)b; h*=33; h|=(int)th; h*=33; h%=CYCLIC_HASH_SIZE; for(p=cyclic_hash[h];p;p=p->next)
14bb592000-05-06Fredrik Hübinette (Hubbe)  {
fc33451997-10-02Fredrik Hübinette (Hubbe)  if(a == p->a && b==p->b && id==p->id)
14bb592000-05-06Fredrik Hübinette (Hubbe)  { ret=p->ret; break; } }
fc33451997-10-02Fredrik Hübinette (Hubbe)  c->ret=(void *)1; c->a=a; c->b=b; c->id=id; c->th=th; c->next=cyclic_hash[h]; cyclic_hash[h]=c;
545ca81997-10-07Fredrik Hübinette (Hubbe)  SET_ONERROR(c->onerr, low_unlink_cyclic, c);
14bb592000-05-06Fredrik Hübinette (Hubbe)  return ret;
fc33451997-10-02Fredrik Hübinette (Hubbe) }