/[cvs]/stack/stack.c
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Diff of /stack/stack.c

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revision 1.23 by masse, Sat Feb 2 18:36:19 2002 UTC revision 1.25 by masse, Sat Feb 2 20:06:11 2002 UTC
# Line 64  stackitem** hash(hashtbl in_hashtbl, con Line 64  stackitem** hash(hashtbl in_hashtbl, con
64    out_hash= out_hash%HASHTBLSIZE;    out_hash= out_hash%HASHTBLSIZE;
65    position= &(in_hashtbl[out_hash]);    position= &(in_hashtbl[out_hash]);
66    
67    while(position != NULL){    while(1){
68      if(*position==NULL)         /* If empty */      if(*position==NULL)         /* If empty */
69        return position;        return position;
70            
# Line 73  stackitem** hash(hashtbl in_hashtbl, con Line 73  stackitem** hash(hashtbl in_hashtbl, con
73    
74      position= &((*position)->next); /* Try next */      position= &((*position)->next); /* Try next */
75    }    }
   return NULL;                  /* end of list reached without finding  
                                    an empty position */  
76  }  }
77    
78  /* Generic push function. */  /* Generic push function. */
# Line 218  extern void print_(stackitem** stack_hea Line 216  extern void print_(stackitem** stack_hea
216      printf("\"%s\"", (char*)temp->content.ptr);      printf("\"%s\"", (char*)temp->content.ptr);
217      break;      break;
218    case symbol:    case symbol:
219      case func:
220      printf("%s", temp->id);      printf("%s", temp->id);
221      break;      break;
222    default:    default:
# Line 286  extern void pack(stackitem** stack_head) Line 285  extern void pack(stackitem** stack_head)
285    void* delimiter;    void* delimiter;
286    stackitem *iterator, *temp, *pack;    stackitem *iterator, *temp, *pack;
287    
   if((*stack_head)==NULL) {  
     printerr("Stack empty");  
     return;  
   }  
   
288    delimiter= (*stack_head)->content.ptr; /* Get delimiter */    delimiter= (*stack_head)->content.ptr; /* Get delimiter */
289    toss(stack_head);    toss(stack_head);
290    
291    iterator= *stack_head;    iterator= *stack_head;
292    
293    /* Search for first delimiter */    if(iterator==NULL || iterator->content.ptr==delimiter) {
294    while(iterator->next!=NULL && iterator->next->content.ptr!=delimiter)      temp= NULL;
     iterator= iterator->next;  
   
   /* Extract list */  
   temp= *stack_head;  
   *stack_head= iterator->next;  
   iterator->next= NULL;  
     
   if(*stack_head!=NULL && (*stack_head)->content.ptr==delimiter)  
295      toss(stack_head);      toss(stack_head);
296      } else {
297        /* Search for first delimiter */
298        while(iterator->next!=NULL && iterator->next->content.ptr!=delimiter)
299          iterator= iterator->next;
300        
301        /* Extract list */
302        temp= *stack_head;
303        *stack_head= iterator->next;
304        iterator->next= NULL;
305        
306        if(*stack_head!=NULL && (*stack_head)->content.ptr==delimiter)
307          toss(stack_head);
308      }
309    
310    /* Push list */    /* Push list */
311    pack= malloc(sizeof(stackitem));    pack= malloc(sizeof(stackitem));
# Line 407  extern void expand(stackitem** stack_hea Line 406  extern void expand(stackitem** stack_hea
406    new_head= temp= (*stack_head)->content.ptr;    new_head= temp= (*stack_head)->content.ptr;
407    toss(stack_head);    toss(stack_head);
408    
409      if(temp==NULL)
410        return;
411    
412    /* Search the end of the list */    /* Search the end of the list */
413    while(temp->next!=NULL)    while(temp->next!=NULL)
414      temp= temp->next;      temp= temp->next;
# Line 503  extern void quit() Line 505  extern void quit()
505    exit(EXIT_SUCCESS);    exit(EXIT_SUCCESS);
506  }  }
507    
508    /* Clear stack */
509    extern void clear(stackitem** stack_head)
510    {
511      while(*stack_head!=NULL)
512        toss(stack_head);
513    }
514    
515  int main()  int main()
516  {  {
517    stackitem* s= NULL;    stackitem* s= NULL;
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