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

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revision 1.33 by teddy, Tue Feb 5 23:00:42 2002 UTC revision 1.34 by masse, Tue Feb 5 23:26:46 2002 UTC
# Line 255  extern void toss(environment *env) Line 255  extern void toss(environment *env)
255  }  }
256    
257  /* Print newline. */  /* Print newline. */
258  extern void nl(environment *env)  extern void nl()
259  {  {
260    printf("\n");    printf("\n");
261  }  }
# Line 489  int stack_read(environment *env, char *i Line 489  int stack_read(environment *env, char *i
489        break;        break;
490      }      }
491      /* If symbol */      /* If symbol */
492      if((convert= sscanf(in_line, "%[^][ ;\n\r_]%[^\n\r]", temp, rest))) {      if((convert= sscanf(in_line, "%[^][ ;\n\r]%[^\n\r]", temp, rest))) {
493          push_sym(env, temp);          push_sym(env, temp);
494          break;          break;
495      }      }
# Line 659  extern void words(environment *env) Line 659  extern void words(environment *env)
659    }    }
660  }  }
661    
662    /* Forgets a symbol (remove it from the hash table) */
663    extern void forget(environment *env)
664    {
665      char* sym_id;
666      stackitem *stack_head= env->head;
667      symbol **hash_entry, *temp;
668    
669      if(stack_head==NULL || stack_head->item->type!=symb) {
670        printerr("Stack empty or not a symbol");
671        return;
672      }
673    
674      sym_id= ((symbol*)(stack_head->item->content.ptr))->id;
675      toss(env);
676    
677      hash_entry= hash(env->symbols, sym_id);
678      temp= *hash_entry;
679      *hash_entry= (*hash_entry)->next;
680      
681      if(temp->val!=NULL) {
682        free_val(temp->val);
683      }
684      free(temp->id);
685      free(temp);
686    }
687    
688  int main()  int main()
689  {  {
690    environment myenv;    environment myenv;
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