218 |
switch (val->type){ /* and free the contents if necessary */ |
switch (val->type){ /* and free the contents if necessary */ |
219 |
case string: |
case string: |
220 |
free(val->content.ptr); |
free(val->content.ptr); |
221 |
|
break; |
222 |
case list: /* lists needs to be freed recursively */ |
case list: /* lists needs to be freed recursively */ |
223 |
item=val->content.ptr; |
item=val->content.ptr; |
224 |
while(item != NULL) { /* for all stack items */ |
while(item != NULL) { /* for all stack items */ |
241 |
stackitem *temp= env->head; |
stackitem *temp= env->head; |
242 |
|
|
243 |
if((env->head)==NULL) { |
if((env->head)==NULL) { |
244 |
printerr("Stack empty"); |
printerr("Too Few Arguments"); |
245 |
env->err=1; |
env->err=1; |
246 |
return; |
return; |
247 |
} |
} |
257 |
printf("\n"); |
printf("\n"); |
258 |
} |
} |
259 |
|
|
260 |
|
/* Gets the type of a value */ |
261 |
|
extern void type(environment *env){ |
262 |
|
int typenum; |
263 |
|
|
264 |
|
if((env->head)==NULL) { |
265 |
|
printerr("Too Few Arguments"); |
266 |
|
env->err=1; |
267 |
|
return; |
268 |
|
} |
269 |
|
typenum=env->head->item->type; |
270 |
|
toss(env); |
271 |
|
switch(typenum){ |
272 |
|
case integer: |
273 |
|
push_sym(env, "integer"); |
274 |
|
break; |
275 |
|
case string: |
276 |
|
push_sym(env, "string"); |
277 |
|
break; |
278 |
|
case symb: |
279 |
|
push_sym(env, "symbol"); |
280 |
|
break; |
281 |
|
case func: |
282 |
|
push_sym(env, "function"); |
283 |
|
break; |
284 |
|
case list: |
285 |
|
push_sym(env, "list"); |
286 |
|
break; |
287 |
|
default: |
288 |
|
push_sym(env, "unknown"); |
289 |
|
break; |
290 |
|
} |
291 |
|
} |
292 |
|
|
293 |
/* Prints the top element of the stack. */ |
/* Prints the top element of the stack. */ |
294 |
void print_h(stackitem *stack_head) |
void print_h(stackitem *stack_head) |
295 |
{ |
{ |
317 |
|
|
318 |
extern void print_(environment *env) { |
extern void print_(environment *env) { |
319 |
if(env->head==NULL) { |
if(env->head==NULL) { |
320 |
printerr("Stack empty"); |
printerr("Too Few Arguments"); |
321 |
env->err=1; |
env->err=1; |
322 |
return; |
return; |
323 |
} |
} |
348 |
extern void printstack(environment *env) |
extern void printstack(environment *env) |
349 |
{ |
{ |
350 |
if(env->head == NULL) { |
if(env->head == NULL) { |
|
printerr("Stack empty"); |
|
|
env->err=1; |
|
351 |
return; |
return; |
352 |
} |
} |
353 |
print_st(env->head, 1); |
print_st(env->head, 1); |
360 |
stackitem *temp= env->head; |
stackitem *temp= env->head; |
361 |
|
|
362 |
if((env->head)==NULL) { |
if((env->head)==NULL) { |
363 |
printerr("Stack empty"); |
printerr("Too Few Arguments"); |
364 |
env->err=1; |
env->err=1; |
365 |
return; |
return; |
366 |
} |
} |
367 |
|
|
368 |
if(env->head->next==NULL) { |
if(env->head->next==NULL) { |
369 |
printerr("Not enough arguments"); |
printerr("Too Few Arguments"); |
370 |
env->err=1; |
env->err=1; |
371 |
return; |
return; |
372 |
} |
} |
392 |
value *val; |
value *val; |
393 |
|
|
394 |
if(env->head == NULL) { |
if(env->head == NULL) { |
395 |
printerr("Stack empty"); |
printerr("Too Few Arguments"); |
396 |
env->err=1; |
env->err=1; |
397 |
return; |
return; |
398 |
} |
} |
399 |
|
|
400 |
if(env->head->item->type!=symb) { |
if(env->head->item->type!=symb) { |
401 |
printerr("Not a symbol"); |
printerr("Bad Argument Type"); |
402 |
env->err=1; |
env->err=2; |
403 |
return; |
return; |
404 |
} |
} |
405 |
|
|
406 |
val=((symbol *)(env->head->item->content.ptr))->val; |
val=((symbol *)(env->head->item->content.ptr))->val; |
407 |
if(val == NULL){ |
if(val == NULL){ |
408 |
printerr("Unbound variable"); |
printerr("Unbound Variable"); |
409 |
env->err=1; |
env->err=3; |
410 |
return; |
return; |
411 |
} |
} |
412 |
toss(env); /* toss the symbol */ |
toss(env); /* toss the symbol */ |
421 |
{ |
{ |
422 |
funcp in_func; |
funcp in_func; |
423 |
if(env->head==NULL) { |
if(env->head==NULL) { |
424 |
printerr("Stack empty"); |
printerr("Too Few Arguments"); |
425 |
env->err=1; |
env->err=1; |
426 |
return; |
return; |
427 |
} |
} |
489 |
} |
} |
490 |
|
|
491 |
/* Parse input. */ |
/* Parse input. */ |
492 |
int stack_read(environment *env, char *in_line) |
void stack_read(environment *env, char *in_line) |
493 |
{ |
{ |
494 |
char *temp, *rest; |
char *temp, *rest; |
495 |
int itemp; |
int itemp; |
550 |
} |
} |
551 |
} while(0); |
} while(0); |
552 |
|
|
|
|
|
553 |
free(temp); |
free(temp); |
554 |
|
|
555 |
if(convert<2) { |
if(convert<2) { |
556 |
free(rest); |
free(rest); |
557 |
return 0; |
return; |
558 |
} |
} |
559 |
|
|
560 |
stack_read(env, rest); |
stack_read(env, rest); |
561 |
|
|
562 |
free(rest); |
free(rest); |
|
return 1; |
|
563 |
} |
} |
564 |
|
|
565 |
/* Relocate elements of the list on the stack. */ |
/* Relocate elements of the list on the stack. */ |
568 |
stackitem *temp, *new_head; |
stackitem *temp, *new_head; |
569 |
|
|
570 |
/* Is top element a list? */ |
/* Is top element a list? */ |
571 |
if(env->head==NULL || env->head->item->type!=list) { |
if(env->head==NULL) { |
572 |
printerr("Stack empty or not a list"); |
printerr("Too Few Arguments"); |
573 |
env->err=1; |
env->err=1; |
574 |
return; |
return; |
575 |
} |
} |
576 |
|
if(env->head->item->type!=list) { |
577 |
|
printerr("Bad Argument Type"); |
578 |
|
env->err=2; |
579 |
|
return; |
580 |
|
} |
581 |
|
|
582 |
/* The first list element is the new stack head */ |
/* The first list element is the new stack head */ |
583 |
new_head= temp= env->head->item->content.ptr; |
new_head= temp= env->head->item->content.ptr; |
602 |
int result; |
int result; |
603 |
|
|
604 |
if((env->head)==NULL || env->head->next==NULL) { |
if((env->head)==NULL || env->head->next==NULL) { |
605 |
printerr("Not enough elements to compare"); |
printerr("Too Few Arguments"); |
606 |
env->err=1; |
env->err=1; |
607 |
return; |
return; |
608 |
} |
} |
621 |
{ |
{ |
622 |
int val; |
int val; |
623 |
|
|
624 |
if((env->head)==NULL || env->head->item->type!=integer) { |
if((env->head)==NULL) { |
625 |
printerr("Stack empty or element is not a integer"); |
printerr("Too Few Arguments"); |
626 |
env->err=1; |
env->err=1; |
627 |
return; |
return; |
628 |
} |
} |
629 |
|
|
630 |
|
if(env->head->item->type!=integer) { |
631 |
|
printerr("Bad Argument Type"); |
632 |
|
env->err=2; |
633 |
|
return; |
634 |
|
} |
635 |
|
|
636 |
val= env->head->item->content.val; |
val= env->head->item->content.val; |
637 |
toss(env); |
toss(env); |
638 |
push_int(&(env->head), !val); |
push_int(&(env->head), !val); |
652 |
symbol *sym; |
symbol *sym; |
653 |
|
|
654 |
/* Needs two values on the stack, the top one must be a symbol */ |
/* Needs two values on the stack, the top one must be a symbol */ |
655 |
if(env->head==NULL || env->head->next==NULL |
if(env->head==NULL || env->head->next==NULL) { |
656 |
|| env->head->item->type!=symb) { |
printerr("Too Few Arguments"); |
|
printerr("Define what?"); |
|
657 |
env->err=1; |
env->err=1; |
658 |
return; |
return; |
659 |
} |
} |
660 |
|
|
661 |
|
if(env->head->item->type!=symb) { |
662 |
|
printerr("Bad Argument Type"); |
663 |
|
env->err=2; |
664 |
|
return; |
665 |
|
} |
666 |
|
|
667 |
/* long names are a pain */ |
/* long names are a pain */ |
668 |
sym=env->head->item->content.ptr; |
sym=env->head->item->content.ptr; |
669 |
|
|
713 |
stackitem *stack_head= env->head; |
stackitem *stack_head= env->head; |
714 |
symbol **hash_entry, *temp; |
symbol **hash_entry, *temp; |
715 |
|
|
716 |
if(stack_head==NULL || stack_head->item->type!=symb) { |
if(stack_head==NULL) { |
717 |
printerr("Stack empty or not a symbol"); |
printerr("Too Few Arguments"); |
718 |
|
env->err=1; |
719 |
|
return; |
720 |
|
} |
721 |
|
|
722 |
|
if(stack_head->item->type!=symb) { |
723 |
|
printerr("Bad Argument Type"); |
724 |
|
env->err=2; |
725 |
return; |
return; |
726 |
} |
} |
727 |
|
|
737 |
} |
} |
738 |
free(temp->id); |
free(temp->id); |
739 |
free(temp); |
free(temp); |
740 |
} |
} |
741 |
|
|
742 |
|
/* Returns the current error number to the stack */ |
743 |
|
extern void errn(environment *env){ |
744 |
|
push_int(&(env->head), env->err); |
745 |
|
} |
746 |
|
|
747 |
int main() |
int main() |
748 |
{ |
{ |