/[cvs]/stack/stack.c
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revision 1.73 by masse, Tue Feb 12 23:16:56 2002 UTC revision 1.77 by teddy, Wed Feb 13 19:53:55 2002 UTC
# Line 155  symbol **hash(hashtbl in_hashtbl, const Line 155  symbol **hash(hashtbl in_hashtbl, const
155    }    }
156  }  }
157    
 /* Generic push function. */  
 void push(environment *env, stackitem* in_item)  
 {  
   in_item->next= env->head;  
   env->head= in_item;  
 }  
   
158  /* Push a value onto the stack */  /* Push a value onto the stack */
159  void push_val(environment *env, value *val)  void push_val(environment *env, value *val)
160  {  {
161    stackitem *new_item= malloc(sizeof(stackitem));    stackitem *new_item= malloc(sizeof(stackitem));
162    new_item->item= val;    new_item->item= val;
163    val->refcount++;    val->refcount++;
164    push(env, new_item);    new_item->next= env->head;
165      env->head= new_item;
166  }  }
167    
168  /* Push an integer onto the stack. */  /* Push an integer onto the stack. */
169  void push_int(environment *env, int in_val)  void push_int(environment *env, int in_val)
170  {  {
171    value *new_value= malloc(sizeof(value));    value *new_value= malloc(sizeof(value));
   stackitem *new_item= malloc(sizeof(stackitem));  
   new_item->item= new_value;  
172        
173    new_value->content.val= in_val;    new_value->content.val= in_val;
174    new_value->type= integer;    new_value->type= integer;
175    new_value->refcount=1;    new_value->refcount=1;
176    
177    push(env, new_item);    push_val(env, new_value);
178  }  }
179    
180  /* Copy a string onto the stack. */  /* Copy a string onto the stack. */
181  void push_cstring(environment *env, const char *in_string)  void push_cstring(environment *env, const char *in_string)
182  {  {
183    value *new_value= malloc(sizeof(value));    value *new_value= malloc(sizeof(value));
   stackitem *new_item= malloc(sizeof(stackitem));  
   new_item->item=new_value;  
184    
185    new_value->content.ptr= malloc(strlen(in_string)+1);    new_value->content.ptr= malloc(strlen(in_string)+1);
186    strcpy(new_value->content.ptr, in_string);    strcpy(new_value->content.ptr, in_string);
187    new_value->type= string;    new_value->type= string;
188    new_value->refcount=1;    new_value->refcount=1;
189    
190    push(env, new_item);    push_val(env, new_value);
191  }  }
192    
193  /* Mangle a symbol name to a valid C identifier name */  /* Mangle a symbol name to a valid C identifier name */
# Line 252  extern void mangle(environment *env){ Line 242  extern void mangle(environment *env){
242  /* Push a symbol onto the stack. */  /* Push a symbol onto the stack. */
243  void push_sym(environment *env, const char *in_string)  void push_sym(environment *env, const char *in_string)
244  {  {
   stackitem *new_item;          /* The new stack item */  
   /* ...which will contain... */  
245    value *new_value;             /* A new symbol value */    value *new_value;             /* A new symbol value */
246    /* ...which might point to... */    /* ...which might point to... */
247    symbol **new_symbol;          /* (if needed) A new actual symbol */    symbol **new_symbol;          /* (if needed) A new actual symbol */
# Line 266  void push_sym(environment *env, const ch Line 254  void push_sym(environment *env, const ch
254    const char *dlerr;            /* Dynamic linker error */    const char *dlerr;            /* Dynamic linker error */
255    char *mangled;                /* Mangled function name */    char *mangled;                /* Mangled function name */
256    
   /* Create a new stack item containing a new value */  
   new_item= malloc(sizeof(stackitem));  
257    new_value= malloc(sizeof(value));    new_value= malloc(sizeof(value));
   new_item->item=new_value;  
258    
259    /* The new value is a symbol */    /* The new value is a symbol */
260    new_value->type= symb;    new_value->type= symb;
# Line 313  void push_sym(environment *env, const ch Line 298  void push_sym(environment *env, const ch
298        new_fvalue->refcount= 1;        new_fvalue->refcount= 1;
299      }      }
300    }    }
301    push(env, new_item);    push_val(env, new_value);
302  }  }
303    
304  /* Print newline. */  /* Print newline. */
# Line 546  extern void eval(environment *env) Line 531  extern void eval(environment *env)
531    
532  /* Reverse (flip) a list */  /* Reverse (flip) a list */
533  extern void rev(environment *env){  extern void rev(environment *env){
534    stackitem *old_head, *new_head, *item;    stackitem *item, *temp, *prev= NULL;
535    
536    if((env->head)==NULL) {    if((env->head)==NULL) {
537      printerr("Too Few Arguments");      printerr("Too Few Arguments");
# Line 560  extern void rev(environment *env){ Line 545  extern void rev(environment *env){
545      return;      return;
546    }    }
547    
548    old_head=(stackitem *)(env->head->item->content.ptr);    item= (stackitem *)(env->head->item->content.ptr);
549    new_head=NULL;    while(item->next!=NULL){
550    while(old_head != NULL){      temp= item->next;
551      item=old_head;      item->next= prev;
552      old_head=old_head->next;      prev= item;
553      item->next=new_head;      item= temp;
     new_head=item;  
554    }    }
555    env->head->item->content.ptr=new_head;    item->next= prev;
556    
557      env->head->item->content.ptr=item;
558  }  }
559    
560  /* Make a list. */  /* Make a list. */
# Line 606  extern void pack(environment *env) Line 592  extern void pack(environment *env)
592    pack->content.ptr= temp;    pack->content.ptr= temp;
593    pack->refcount= 1;    pack->refcount= 1;
594    
595    temp= malloc(sizeof(stackitem));    push_val(env, pack);
   temp->item= pack;  
   
   push(env, temp);  
596    rev(env);    rev(env);
597  }  }
598    
# Line 734  extern void def(environment *env) Line 717  extern void def(environment *env)
717    toss(env); toss(env);    toss(env); toss(env);
718  }  }
719    
720    extern void clear(environment *);
721    void forget_sym(symbol **);
722    
723  /* Quit stack. */  /* Quit stack. */
724  extern void quit(environment *env)  extern void quit(environment *env)
725  {  {
726      long i;
727    
728      clear(env);
729      if (env->err) return;
730      for(i= 0; i<HASHTBLSIZE; i++) {
731        if (env->symbols[i]!= NULL) {
732          forget_sym(&(env->symbols[i]));
733          env->symbols[i]= NULL;
734        }
735      }
736    exit(EXIT_SUCCESS);    exit(EXIT_SUCCESS);
737  }  }
738    
# Line 762  extern void words(environment *env) Line 758  extern void words(environment *env)
758    }    }
759  }  }
760    
761    /* Internal forget function */
762    void forget_sym(symbol **hash_entry) {
763      symbol *temp;
764    
765      temp= *hash_entry;
766      *hash_entry= (*hash_entry)->next;
767      
768      if(temp->val!=NULL) {
769        free_val(temp->val);
770      }
771      free(temp->id);
772      free(temp);
773    }
774    
775  /* Forgets a symbol (remove it from the hash table) */  /* Forgets a symbol (remove it from the hash table) */
776  extern void forget(environment *env)  extern void forget(environment *env)
777  {  {
778    char* sym_id;    char* sym_id;
779    stackitem *stack_head= env->head;    stackitem *stack_head= env->head;
   symbol **hash_entry, *temp;  
780    
781    if(stack_head==NULL) {    if(stack_head==NULL) {
782      printerr("Too Few Arguments");      printerr("Too Few Arguments");
# Line 784  extern void forget(environment *env) Line 793  extern void forget(environment *env)
793    sym_id= ((symbol*)(stack_head->item->content.ptr))->id;    sym_id= ((symbol*)(stack_head->item->content.ptr))->id;
794    toss(env);    toss(env);
795    
796    hash_entry= hash(env->symbols, sym_id);    return forget_sym(hash(env->symbols, sym_id));
   temp= *hash_entry;  
   *hash_entry= (*hash_entry)->next;  
     
   if(temp->val!=NULL) {  
     free_val(temp->val);  
   }  
   free(temp->id);  
   free(temp);  
797  }  }
798    
799  /* Returns the current error number to the stack */  /* Returns the current error number to the stack */
# Line 1144  extern void sx_666f72(environment *env) Line 1145  extern void sx_666f72(environment *env)
1145  /* 'to' */  /* 'to' */
1146  extern void to(environment *env) {  extern void to(environment *env) {
1147    int i, start, ending;    int i, start, ending;
1148      stackitem *temp_head;
1149      value *temp_val;
1150        
1151    if((env->head)==NULL || env->head->next==NULL) {    if((env->head)==NULL || env->head->next==NULL) {
1152      printerr("Too Few Arguments");      printerr("Too Few Arguments");
# Line 1163  extern void to(environment *env) { Line 1166  extern void to(environment *env) {
1166    start= env->head->item->content.val;    start= env->head->item->content.val;
1167    toss(env); if(env->err) return;    toss(env); if(env->err) return;
1168    
1169    push_sym(env, "[");    temp_head= env->head;
1170      env->head= NULL;
1171    
1172    if(ending>=start) {    if(ending>=start) {
1173      for(i= start; i<=ending; i++)      for(i= ending; i>=start; i--)
1174        push_int(env, i);        push_int(env, i);
1175    } else {    } else {
1176      for(i= start; i>=ending; i--)      for(i= ending; i<=start; i++)
1177        push_int(env, i);        push_int(env, i);
1178    }    }
1179    
1180    pack(env); if(env->err) return;    temp_val= malloc(sizeof(value));
1181      temp_val->content.ptr= env->head;
1182      temp_val->refcount= 1;
1183      temp_val->type= list;
1184      env->head= temp_head;
1185      push_val(env, temp_val);
1186  }  }
1187    
1188  /* Read a string */  /* Read a string */
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