/[cvs]/stack/stack.c
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revision 1.73 by masse, Tue Feb 12 23:16:56 2002 UTC revision 1.76 by masse, Wed Feb 13 00:47:36 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 1144  extern void sx_666f72(environment *env) Line 1127  extern void sx_666f72(environment *env)
1127  /* 'to' */  /* 'to' */
1128  extern void to(environment *env) {  extern void to(environment *env) {
1129    int i, start, ending;    int i, start, ending;
1130      stackitem *temp_head;
1131      value *temp_val;
1132        
1133    if((env->head)==NULL || env->head->next==NULL) {    if((env->head)==NULL || env->head->next==NULL) {
1134      printerr("Too Few Arguments");      printerr("Too Few Arguments");
# Line 1163  extern void to(environment *env) { Line 1148  extern void to(environment *env) {
1148    start= env->head->item->content.val;    start= env->head->item->content.val;
1149    toss(env); if(env->err) return;    toss(env); if(env->err) return;
1150    
1151    push_sym(env, "[");    temp_head= env->head;
1152      env->head= NULL;
1153    
1154    if(ending>=start) {    if(ending>=start) {
1155      for(i= start; i<=ending; i++)      for(i= ending; i>=start; i--)
1156        push_int(env, i);        push_int(env, i);
1157    } else {    } else {
1158      for(i= start; i>=ending; i--)      for(i= ending; i<=start; i++)
1159        push_int(env, i);        push_int(env, i);
1160    }    }
1161    
1162    pack(env); if(env->err) return;    temp_val= malloc(sizeof(value));
1163      temp_val->content.ptr= env->head;
1164      temp_val->refcount= 1;
1165      temp_val->type= list;
1166      env->head= temp_head;
1167      push_val(env, temp_val);
1168  }  }
1169    
1170  /* Read a string */  /* Read a string */
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