1 |
/* printf */ |
/* printf, sscanf, fgets, fprintf */ |
2 |
#include <stdio.h> |
#include <stdio.h> |
3 |
/* EXIT_SUCCESS */ |
/* exit, EXIT_SUCCESS, malloc, free */ |
4 |
#include <stdlib.h> |
#include <stdlib.h> |
5 |
/* NULL */ |
/* NULL */ |
6 |
#include <stddef.h> |
#include <stddef.h> |
7 |
/* dlopen, dlsym, dlerror */ |
/* dlopen, dlsym, dlerror */ |
8 |
#include <dlfcn.h> |
#include <dlfcn.h> |
9 |
/* assert */ |
/* strcmp, strcpy, strlen, strcat, strdup */ |
|
#include <assert.h> |
|
|
/* strcat */ |
|
10 |
#include <string.h> |
#include <string.h> |
11 |
|
|
12 |
#define HASHTBLSIZE 65536 |
#define HASHTBLSIZE 2048 |
13 |
|
|
14 |
/* First, define some types. */ |
/* First, define some types. */ |
15 |
|
|
48 |
typedef struct stackitem_struct |
typedef struct stackitem_struct |
49 |
{ |
{ |
50 |
value *item; /* The value on the stack */ |
value *item; /* The value on the stack */ |
51 |
|
/* (This is never NULL) */ |
52 |
struct stackitem_struct *next; /* Next item */ |
struct stackitem_struct *next; /* Next item */ |
53 |
} stackitem; |
} stackitem; |
54 |
|
|
59 |
hashtbl symbols; /* Hash table of all variable bindings */ |
hashtbl symbols; /* Hash table of all variable bindings */ |
60 |
int err; /* Error flag */ |
int err; /* Error flag */ |
61 |
int non_eval_flag; |
int non_eval_flag; |
62 |
|
char *in_string; /* Input pending to be read */ |
63 |
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char *free_string; /* Free this string when all input is |
64 |
|
read from in_string */ |
65 |
} environment; |
} environment; |
66 |
|
|
67 |
/* A type for pointers to external functions */ |
/* A type for pointers to external functions */ |
73 |
{ |
{ |
74 |
int i; |
int i; |
75 |
|
|
76 |
|
env->in_string= NULL; |
77 |
env->err= 0; |
env->err= 0; |
78 |
env->non_eval_flag= 0; |
env->non_eval_flag= 0; |
79 |
for(i= 0; i<HASHTBLSIZE; i++) |
for(i= 0; i<HASHTBLSIZE; i++) |
104 |
} |
} |
105 |
free(val); /* Free the actual list value */ |
free(val); /* Free the actual list value */ |
106 |
break; |
break; |
107 |
default: |
case integer: |
108 |
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case func: |
109 |
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case symb: |
110 |
break; |
break; |
111 |
} |
} |
112 |
} |
} |
157 |
} |
} |
158 |
} |
} |
159 |
|
|
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/* Generic push function. */ |
|
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void push(stackitem** stack_head, stackitem* in_item) |
|
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{ |
|
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in_item->next= *stack_head; |
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*stack_head= in_item; |
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} |
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|
160 |
/* Push a value onto the stack */ |
/* Push a value onto the stack */ |
161 |
void push_val(stackitem **stack_head, value *val) |
void push_val(environment *env, value *val) |
162 |
{ |
{ |
163 |
stackitem *new_item= malloc(sizeof(stackitem)); |
stackitem *new_item= malloc(sizeof(stackitem)); |
164 |
new_item->item= val; |
new_item->item= val; |
165 |
val->refcount++; |
val->refcount++; |
166 |
push(stack_head, new_item); |
new_item->next= env->head; |
167 |
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env->head= new_item; |
168 |
} |
} |
169 |
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|
170 |
/* Push an integer onto the stack. */ |
/* Push an integer onto the stack. */ |
171 |
void push_int(stackitem **stack_head, int in_val) |
void push_int(environment *env, int in_val) |
172 |
{ |
{ |
173 |
value *new_value= malloc(sizeof(value)); |
value *new_value= malloc(sizeof(value)); |
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stackitem *new_item= malloc(sizeof(stackitem)); |
|
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new_item->item= new_value; |
|
174 |
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|
175 |
new_value->content.val= in_val; |
new_value->content.val= in_val; |
176 |
new_value->type= integer; |
new_value->type= integer; |
177 |
new_value->refcount=1; |
new_value->refcount=1; |
178 |
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|
179 |
push(stack_head, new_item); |
push_val(env, new_value); |
180 |
} |
} |
181 |
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|
182 |
/* Copy a string onto the stack. */ |
/* Copy a string onto the stack. */ |
183 |
void push_cstring(stackitem **stack_head, const char *in_string) |
void push_cstring(environment *env, const char *in_string) |
184 |
{ |
{ |
185 |
value *new_value= malloc(sizeof(value)); |
value *new_value= malloc(sizeof(value)); |
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stackitem *new_item= malloc(sizeof(stackitem)); |
|
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new_item->item=new_value; |
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186 |
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|
187 |
new_value->content.ptr= malloc(strlen(in_string)+1); |
new_value->content.ptr= malloc(strlen(in_string)+1); |
188 |
strcpy(new_value->content.ptr, in_string); |
strcpy(new_value->content.ptr, in_string); |
189 |
new_value->type= string; |
new_value->type= string; |
190 |
new_value->refcount=1; |
new_value->refcount=1; |
191 |
|
|
192 |
push(stack_head, new_item); |
push_val(env, new_value); |
193 |
} |
} |
194 |
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|
195 |
/* Mangle a symbol name to a valid C identifier name */ |
/* Mangle a symbol name to a valid C identifier name */ |
196 |
char *mangle_(const char *old_string){ |
char *mangle_str(const char *old_string){ |
197 |
char validchars[] |
char validchars[] |
198 |
="0123456789abcdef"; |
="0123456789abcdef"; |
199 |
char *new_string, *current; |
char *new_string, *current; |
200 |
|
|
201 |
new_string=malloc(strlen(old_string)+4); |
new_string=malloc((strlen(old_string)*2)+4); |
202 |
strcpy(new_string, "sx_"); /* Stack eXternal */ |
strcpy(new_string, "sx_"); /* Stack eXternal */ |
203 |
current=new_string+3; |
current=new_string+3; |
204 |
while(old_string[0] != '\0'){ |
while(old_string[0] != '\0'){ |
205 |
current[0]=validchars[old_string[0]/16]; |
current[0]=validchars[(unsigned char)(old_string[0])/16]; |
206 |
current[1]=validchars[old_string[0]%16]; |
current[1]=validchars[(unsigned char)(old_string[0])%16]; |
207 |
current+=2; |
current+=2; |
208 |
old_string++; |
old_string++; |
209 |
} |
} |
228 |
return; |
return; |
229 |
} |
} |
230 |
|
|
231 |
new_string= mangle_((const char *)(env->head->item->content.ptr)); |
new_string= mangle_str((const char *)(env->head->item->content.ptr)); |
232 |
|
|
233 |
toss(env); |
toss(env); |
234 |
if(env->err) return; |
if(env->err) return; |
238 |
new_value->type= string; |
new_value->type= string; |
239 |
new_value->refcount=1; |
new_value->refcount=1; |
240 |
|
|
241 |
push_val(&(env->head), new_value); |
push_val(env, new_value); |
242 |
} |
} |
243 |
|
|
244 |
/* Push a symbol onto the stack. */ |
/* Push a symbol onto the stack. */ |
245 |
void push_sym(environment *env, const char *in_string) |
void push_sym(environment *env, const char *in_string) |
246 |
{ |
{ |
|
stackitem *new_item; /* The new stack item */ |
|
|
/* ...which will contain... */ |
|
247 |
value *new_value; /* A new symbol value */ |
value *new_value; /* A new symbol value */ |
248 |
/* ...which might point to... */ |
/* ...which might point to... */ |
249 |
symbol **new_symbol; /* (if needed) A new actual symbol */ |
symbol **new_symbol; /* (if needed) A new actual symbol */ |
256 |
const char *dlerr; /* Dynamic linker error */ |
const char *dlerr; /* Dynamic linker error */ |
257 |
char *mangled; /* Mangled function name */ |
char *mangled; /* Mangled function name */ |
258 |
|
|
|
/* Create a new stack item containing a new value */ |
|
|
new_item= malloc(sizeof(stackitem)); |
|
259 |
new_value= malloc(sizeof(value)); |
new_value= malloc(sizeof(value)); |
|
new_item->item=new_value; |
|
260 |
|
|
261 |
/* The new value is a symbol */ |
/* The new value is a symbol */ |
262 |
new_value->type= symb; |
new_value->type= symb; |
286 |
funcptr= dlsym(handle, in_string); /* Get function pointer */ |
funcptr= dlsym(handle, in_string); /* Get function pointer */ |
287 |
dlerr=dlerror(); |
dlerr=dlerror(); |
288 |
if(dlerr != NULL) { /* If no function was found */ |
if(dlerr != NULL) { /* If no function was found */ |
289 |
mangled=mangle_(in_string); |
mangled=mangle_str(in_string); |
290 |
funcptr= dlsym(handle, mangled); /* try mangling it */ |
funcptr= dlsym(handle, mangled); /* try mangling it */ |
291 |
free(mangled); |
free(mangled); |
292 |
dlerr=dlerror(); |
dlerr=dlerror(); |
300 |
new_fvalue->refcount= 1; |
new_fvalue->refcount= 1; |
301 |
} |
} |
302 |
} |
} |
303 |
push(&(env->head), new_item); |
push_val(env, new_value); |
304 |
} |
} |
305 |
|
|
306 |
/* Print newline. */ |
/* Print newline. */ |
336 |
case list: |
case list: |
337 |
push_sym(env, "list"); |
push_sym(env, "list"); |
338 |
break; |
break; |
|
default: |
|
|
push_sym(env, "unknown"); |
|
|
break; |
|
339 |
} |
} |
340 |
} |
} |
341 |
|
|
347 |
printf("%d", stack_head->item->content.val); |
printf("%d", stack_head->item->content.val); |
348 |
break; |
break; |
349 |
case string: |
case string: |
350 |
printf("\"%s\"", (char*)stack_head->item->content.ptr); |
printf("%s", (char*)stack_head->item->content.ptr); |
351 |
break; |
break; |
352 |
case symb: |
case symb: |
353 |
printf("%s", ((symbol *)(stack_head->item->content.ptr))->id); |
printf("%s", ((symbol *)(stack_head->item->content.ptr))->id); |
366 |
} |
} |
367 |
printf("]"); |
printf("]"); |
368 |
break; |
break; |
|
default: |
|
|
printf("#<unknown %p>", (stack_head->item->content.ptr)); |
|
|
break; |
|
369 |
} |
} |
370 |
} |
} |
371 |
|
|
422 |
env->head->next= temp; |
env->head->next= temp; |
423 |
} |
} |
424 |
|
|
425 |
|
/* Rotate the first three elements on the stack. */ |
426 |
|
extern void rot(environment *env) |
427 |
|
{ |
428 |
|
stackitem *temp= env->head; |
429 |
|
|
430 |
|
if(env->head==NULL || env->head->next==NULL |
431 |
|
|| env->head->next->next==NULL) { |
432 |
|
printerr("Too Few Arguments"); |
433 |
|
env->err=1; |
434 |
|
return; |
435 |
|
} |
436 |
|
|
437 |
|
env->head= env->head->next->next; |
438 |
|
temp->next->next= env->head->next; |
439 |
|
env->head->next= temp; |
440 |
|
} |
441 |
|
|
442 |
/* Recall a value from a symbol, if bound */ |
/* Recall a value from a symbol, if bound */ |
443 |
extern void rcl(environment *env) |
extern void rcl(environment *env) |
444 |
{ |
{ |
464 |
} |
} |
465 |
toss(env); /* toss the symbol */ |
toss(env); /* toss the symbol */ |
466 |
if(env->err) return; |
if(env->err) return; |
467 |
push_val(&(env->head), val); /* Return its bound value */ |
push_val(env, val); /* Return its bound value */ |
468 |
} |
} |
469 |
|
|
|
void stack_read(environment*, char*); |
|
|
|
|
470 |
/* If the top element is a symbol, determine if it's bound to a |
/* If the top element is a symbol, determine if it's bound to a |
471 |
function value, and if it is, toss the symbol and execute the |
function value, and if it is, toss the symbol and execute the |
472 |
function. */ |
function. */ |
475 |
funcp in_func; |
funcp in_func; |
476 |
value* temp_val; |
value* temp_val; |
477 |
stackitem* iterator; |
stackitem* iterator; |
|
char* temp_string; |
|
478 |
|
|
479 |
if(env->head==NULL) { |
if(env->head==NULL) { |
480 |
printerr("Too Few Arguments"); |
printerr("Too Few Arguments"); |
482 |
return; |
return; |
483 |
} |
} |
484 |
|
|
485 |
|
eval_start: |
486 |
|
|
487 |
switch(env->head->item->type) { |
switch(env->head->item->type) { |
488 |
/* if it's a symbol */ |
/* if it's a symbol */ |
489 |
case symb: |
case symb: |
490 |
rcl(env); /* get its contents */ |
rcl(env); /* get its contents */ |
491 |
if(env->err) return; |
if(env->err) return; |
492 |
if(env->head->item->type!=symb){ /* don't recurse symbols */ |
if(env->head->item->type!=symb){ /* don't recurse symbols */ |
493 |
eval(env); /* evaluate the value */ |
goto eval_start; |
|
return; |
|
494 |
} |
} |
495 |
break; |
return; |
496 |
|
|
497 |
/* If it's a lone function value, run it */ |
/* If it's a lone function value, run it */ |
498 |
case func: |
case func: |
499 |
in_func= (funcp)(env->head->item->content.ptr); |
in_func= (funcp)(env->head->item->content.ptr); |
500 |
toss(env); |
toss(env); |
501 |
if(env->err) return; |
if(env->err) return; |
502 |
(*in_func)(env); |
return (*in_func)(env); |
|
break; |
|
503 |
|
|
504 |
/* If it's a list */ |
/* If it's a list */ |
505 |
case list: |
case list: |
508 |
toss(env); |
toss(env); |
509 |
if(env->err) return; |
if(env->err) return; |
510 |
iterator= (stackitem*)temp_val->content.ptr; |
iterator= (stackitem*)temp_val->content.ptr; |
511 |
while(iterator!=NULL && iterator->item!=NULL) { |
while(iterator!=NULL) { |
512 |
push_val(&(env->head), iterator->item); |
push_val(env, iterator->item); |
513 |
if(env->head->item->type==symb |
if(env->head->item->type==symb |
514 |
&& strcmp(";", ((symbol*)(env->head->item->content.ptr))->id)==0) { |
&& strcmp(";", ((symbol*)(env->head->item->content.ptr))->id)==0) { |
515 |
toss(env); |
toss(env); |
516 |
if(env->err) return; |
if(env->err) return; |
517 |
|
if(iterator->next == NULL){ |
518 |
|
free_val(temp_val); |
519 |
|
goto eval_start; |
520 |
|
} |
521 |
eval(env); |
eval(env); |
522 |
if(env->err) return; |
if(env->err) return; |
523 |
} |
} |
524 |
iterator= iterator->next; |
iterator= iterator->next; |
525 |
} |
} |
526 |
free_val(temp_val); |
free_val(temp_val); |
527 |
break; |
return; |
|
|
|
|
/* If it's a string */ |
|
|
case string: |
|
|
temp_val= env->head->item; |
|
|
env->head->item->refcount++; |
|
|
toss(env); |
|
|
if(env->err) return; |
|
|
temp_string= malloc(strlen((char*)temp_val->content.ptr)+5); |
|
|
strcpy(temp_string, "[ "); |
|
|
strcat(temp_string, (char*)temp_val->content.ptr); |
|
|
strcat(temp_string, " ]"); |
|
|
stack_read(env, temp_string); |
|
|
eval(env); |
|
|
if(env->err) return; |
|
|
free_val(temp_val); |
|
|
free(temp_string); |
|
|
break; |
|
528 |
|
|
529 |
default: |
default: |
530 |
|
return; |
531 |
} |
} |
532 |
} |
} |
533 |
|
|
561 |
/* Make a list. */ |
/* Make a list. */ |
562 |
extern void pack(environment *env) |
extern void pack(environment *env) |
563 |
{ |
{ |
|
void* delimiter; |
|
564 |
stackitem *iterator, *temp; |
stackitem *iterator, *temp; |
565 |
value *pack; |
value *pack; |
566 |
|
|
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delimiter= env->head->item->content.ptr; /* Get delimiter */ |
|
|
toss(env); |
|
|
|
|
567 |
iterator= env->head; |
iterator= env->head; |
568 |
|
|
569 |
if(iterator==NULL || iterator->item->content.ptr==delimiter) { |
if(iterator==NULL |
570 |
|
|| (iterator->item->type==symb |
571 |
|
&& ((symbol*)(iterator->item->content.ptr))->id[0]=='[')) { |
572 |
temp= NULL; |
temp= NULL; |
573 |
toss(env); |
toss(env); |
574 |
} else { |
} else { |
575 |
/* Search for first delimiter */ |
/* Search for first delimiter */ |
576 |
while(iterator->next!=NULL |
while(iterator->next!=NULL |
577 |
&& iterator->next->item->content.ptr!=delimiter) |
&& (iterator->next->item->type!=symb |
578 |
|
|| ((symbol*)(iterator->next->item->content.ptr))->id[0]!='[')) |
579 |
iterator= iterator->next; |
iterator= iterator->next; |
580 |
|
|
581 |
/* Extract list */ |
/* Extract list */ |
593 |
pack->content.ptr= temp; |
pack->content.ptr= temp; |
594 |
pack->refcount= 1; |
pack->refcount= 1; |
595 |
|
|
596 |
temp= malloc(sizeof(stackitem)); |
push_val(env, pack); |
|
temp->item= pack; |
|
|
|
|
|
push(&(env->head), temp); |
|
597 |
rev(env); |
rev(env); |
598 |
} |
} |
599 |
|
|
|
/* Parse input. */ |
|
|
void stack_read(environment *env, char *in_line) |
|
|
{ |
|
|
char *temp, *rest; |
|
|
int itemp; |
|
|
size_t inlength= strlen(in_line)+1; |
|
|
int convert= 0; |
|
|
|
|
|
temp= malloc(inlength); |
|
|
rest= malloc(inlength); |
|
|
|
|
|
do { |
|
|
/* If comment */ |
|
|
if((convert= sscanf(in_line, "#%[^\n\r]", rest))) { |
|
|
free(temp); free(rest); |
|
|
return; |
|
|
} |
|
|
|
|
|
/* If string */ |
|
|
if((convert= sscanf(in_line, "\"%[^\"\n\r]\" %[^\n\r]", temp, rest))) { |
|
|
push_cstring(&(env->head), temp); |
|
|
break; |
|
|
} |
|
|
/* If integer */ |
|
|
if((convert= sscanf(in_line, "%d %[^\n\r]", &itemp, rest))) { |
|
|
push_int(&(env->head), itemp); |
|
|
break; |
|
|
} |
|
|
/* Escape ';' with '\' */ |
|
|
if((convert= sscanf(in_line, "\\%c%[^\n\r]", temp, rest))) { |
|
|
temp[1]= '\0'; |
|
|
push_sym(env, temp); |
|
|
break; |
|
|
} |
|
|
/* If symbol */ |
|
|
if((convert= sscanf(in_line, "%[^][ ;\n\r]%[^\n\r]", temp, rest))) { |
|
|
push_sym(env, temp); |
|
|
break; |
|
|
} |
|
|
/* If single char */ |
|
|
if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest))) { |
|
|
if(*temp==';') { |
|
|
if(!env->non_eval_flag) { |
|
|
eval(env); /* Evaluate top element */ |
|
|
break; |
|
|
} |
|
|
|
|
|
push_sym(env, ";"); |
|
|
break; |
|
|
} |
|
|
|
|
|
if(*temp==']') { |
|
|
push_sym(env, "["); |
|
|
pack(env); |
|
|
if(env->non_eval_flag) |
|
|
env->non_eval_flag--; |
|
|
break; |
|
|
} |
|
|
|
|
|
if(*temp=='[') { |
|
|
push_sym(env, "["); |
|
|
env->non_eval_flag++; |
|
|
break; |
|
|
} |
|
|
} |
|
|
} while(0); |
|
|
|
|
|
free(temp); |
|
|
|
|
|
if(convert<2) { |
|
|
free(rest); |
|
|
return; |
|
|
} |
|
|
|
|
|
stack_read(env, rest); |
|
|
|
|
|
free(rest); |
|
|
} |
|
|
|
|
600 |
/* Relocate elements of the list on the stack. */ |
/* Relocate elements of the list on the stack. */ |
601 |
extern void expand(environment *env) |
extern void expand(environment *env) |
602 |
{ |
{ |
653 |
result= (left==right); |
result= (left==right); |
654 |
|
|
655 |
toss(env); toss(env); |
toss(env); toss(env); |
656 |
push_int(&(env->head), result); |
push_int(env, result); |
657 |
} |
} |
658 |
|
|
659 |
/* Negates the top element on the stack. */ |
/* Negates the top element on the stack. */ |
675 |
|
|
676 |
val= env->head->item->content.val; |
val= env->head->item->content.val; |
677 |
toss(env); |
toss(env); |
678 |
push_int(&(env->head), !val); |
push_int(env, !val); |
679 |
} |
} |
680 |
|
|
681 |
/* Compares the two top elements on the stack and return 0 if they're the |
/* Compares the two top elements on the stack and return 0 if they're the |
718 |
toss(env); toss(env); |
toss(env); toss(env); |
719 |
} |
} |
720 |
|
|
721 |
|
extern void clear(environment *); |
722 |
|
void forget_sym(symbol **); |
723 |
|
|
724 |
/* Quit stack. */ |
/* Quit stack. */ |
725 |
extern void quit(environment *env) |
extern void quit(environment *env) |
726 |
{ |
{ |
727 |
|
long i; |
728 |
|
|
729 |
|
clear(env); |
730 |
|
if (env->err) return; |
731 |
|
for(i= 0; i<HASHTBLSIZE; i++) { |
732 |
|
if (env->symbols[i]!= NULL) { |
733 |
|
forget_sym(&(env->symbols[i])); |
734 |
|
env->symbols[i]= NULL; |
735 |
|
} |
736 |
|
} |
737 |
exit(EXIT_SUCCESS); |
exit(EXIT_SUCCESS); |
738 |
} |
} |
739 |
|
|
759 |
} |
} |
760 |
} |
} |
761 |
|
|
762 |
|
/* Internal forget function */ |
763 |
|
void forget_sym(symbol **hash_entry) { |
764 |
|
symbol *temp; |
765 |
|
|
766 |
|
temp= *hash_entry; |
767 |
|
*hash_entry= (*hash_entry)->next; |
768 |
|
|
769 |
|
if(temp->val!=NULL) { |
770 |
|
free_val(temp->val); |
771 |
|
} |
772 |
|
free(temp->id); |
773 |
|
free(temp); |
774 |
|
} |
775 |
|
|
776 |
/* Forgets a symbol (remove it from the hash table) */ |
/* Forgets a symbol (remove it from the hash table) */ |
777 |
extern void forget(environment *env) |
extern void forget(environment *env) |
778 |
{ |
{ |
779 |
char* sym_id; |
char* sym_id; |
780 |
stackitem *stack_head= env->head; |
stackitem *stack_head= env->head; |
|
symbol **hash_entry, *temp; |
|
781 |
|
|
782 |
if(stack_head==NULL) { |
if(stack_head==NULL) { |
783 |
printerr("Too Few Arguments"); |
printerr("Too Few Arguments"); |
794 |
sym_id= ((symbol*)(stack_head->item->content.ptr))->id; |
sym_id= ((symbol*)(stack_head->item->content.ptr))->id; |
795 |
toss(env); |
toss(env); |
796 |
|
|
797 |
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); |
|
798 |
} |
} |
799 |
|
|
800 |
/* Returns the current error number to the stack */ |
/* Returns the current error number to the stack */ |
801 |
extern void errn(environment *env){ |
extern void errn(environment *env){ |
802 |
push_int(&(env->head), env->err); |
push_int(env, env->err); |
803 |
} |
} |
804 |
|
|
805 |
|
extern void read(environment*); |
806 |
|
|
807 |
int main() |
int main() |
808 |
{ |
{ |
809 |
environment myenv; |
environment myenv; |
|
char in_string[100]; |
|
810 |
|
|
811 |
init_env(&myenv); |
init_env(&myenv); |
812 |
|
|
813 |
printf("okidok\n "); |
while(1) { |
814 |
|
if(myenv.in_string==NULL) |
815 |
while(fgets(in_string, 100, stdin) != NULL) { |
printstack(&myenv); |
816 |
stack_read(&myenv, in_string); |
read(&myenv); |
817 |
if(myenv.err) { |
if(myenv.err) { |
818 |
printf("(error %d) ", myenv.err); |
printf("(error %d) ", myenv.err); |
819 |
myenv.err=0; |
myenv.err=0; |
820 |
|
} else if(myenv.head!=NULL |
821 |
|
&& myenv.head->item->type==symb |
822 |
|
&& ((symbol*)(myenv.head->item->content.ptr))->id[0]==';') { |
823 |
|
toss(&myenv); /* No error check in main */ |
824 |
|
eval(&myenv); |
825 |
} |
} |
|
printf("okidok\n "); |
|
826 |
} |
} |
827 |
quit(&myenv); |
quit(&myenv); |
828 |
return EXIT_FAILURE; |
return EXIT_FAILURE; |
854 |
strcpy(new_string, b_val->content.ptr); |
strcpy(new_string, b_val->content.ptr); |
855 |
strcat(new_string, a_val->content.ptr); |
strcat(new_string, a_val->content.ptr); |
856 |
free_val(a_val); free_val(b_val); |
free_val(a_val); free_val(b_val); |
857 |
push_cstring(&(env->head), new_string); |
push_cstring(env, new_string); |
858 |
free(new_string); |
free(new_string); |
859 |
return; |
return; |
860 |
} |
} |
868 |
a=env->head->item->content.val; |
a=env->head->item->content.val; |
869 |
toss(env); |
toss(env); |
870 |
if(env->err) return; |
if(env->err) return; |
871 |
b=env->head->item->content.val; |
if(env->head->item->refcount == 1) |
872 |
|
env->head->item->content.val += a; |
873 |
|
else { |
874 |
|
b=env->head->item->content.val; |
875 |
|
toss(env); |
876 |
|
if(env->err) return; |
877 |
|
push_int(env, a+b); |
878 |
|
} |
879 |
|
} |
880 |
|
|
881 |
|
/* - */ |
882 |
|
extern void sx_2d(environment *env) { |
883 |
|
int a, b; |
884 |
|
|
885 |
|
if((env->head)==NULL || env->head->next==NULL) { |
886 |
|
printerr("Too Few Arguments"); |
887 |
|
env->err=1; |
888 |
|
return; |
889 |
|
} |
890 |
|
|
891 |
|
if(env->head->item->type!=integer |
892 |
|
|| env->head->next->item->type!=integer) { |
893 |
|
printerr("Bad Argument Type"); |
894 |
|
env->err=2; |
895 |
|
return; |
896 |
|
} |
897 |
|
a=env->head->item->content.val; |
898 |
|
toss(env); |
899 |
|
if(env->err) return; |
900 |
|
if(env->head->item->refcount == 1) |
901 |
|
env->head->item->content.val -= a; |
902 |
|
else { |
903 |
|
b=env->head->item->content.val; |
904 |
|
toss(env); |
905 |
|
if(env->err) return; |
906 |
|
push_int(env, b-a); |
907 |
|
} |
908 |
|
} |
909 |
|
|
910 |
|
/* > */ |
911 |
|
extern void sx_3e(environment *env) { |
912 |
|
int a, b; |
913 |
|
|
914 |
|
if((env->head)==NULL || env->head->next==NULL) { |
915 |
|
printerr("Too Few Arguments"); |
916 |
|
env->err=1; |
917 |
|
return; |
918 |
|
} |
919 |
|
|
920 |
|
if(env->head->item->type!=integer |
921 |
|
|| env->head->next->item->type!=integer) { |
922 |
|
printerr("Bad Argument Type"); |
923 |
|
env->err=2; |
924 |
|
return; |
925 |
|
} |
926 |
|
a=env->head->item->content.val; |
927 |
toss(env); |
toss(env); |
928 |
if(env->err) return; |
if(env->err) return; |
929 |
push_int(&(env->head), a+b); |
if(env->head->item->refcount == 1) |
930 |
|
env->head->item->content.val = (env->head->item->content.val > a); |
931 |
|
else { |
932 |
|
b=env->head->item->content.val; |
933 |
|
toss(env); |
934 |
|
if(env->err) return; |
935 |
|
push_int(env, b>a); |
936 |
|
} |
937 |
|
} |
938 |
|
|
939 |
|
/* Return copy of a value */ |
940 |
|
value *copy_val(value *old_value){ |
941 |
|
stackitem *old_item, *new_item, *prev_item; |
942 |
|
|
943 |
|
value *new_value=malloc(sizeof(value)); |
944 |
|
|
945 |
|
new_value->type=old_value->type; |
946 |
|
new_value->refcount=0; /* This is increased if/when this |
947 |
|
value is referenced somewhere, like |
948 |
|
in a stack item or a variable */ |
949 |
|
switch(old_value->type){ |
950 |
|
case integer: |
951 |
|
new_value->content.val=old_value->content.val; |
952 |
|
break; |
953 |
|
case string: |
954 |
|
(char *)(new_value->content.ptr) |
955 |
|
= strdup((char *)(old_value->content.ptr)); |
956 |
|
break; |
957 |
|
case func: |
958 |
|
case symb: |
959 |
|
new_value->content.ptr=old_value->content.ptr; |
960 |
|
break; |
961 |
|
case list: |
962 |
|
new_value->content.ptr=NULL; |
963 |
|
|
964 |
|
prev_item=NULL; |
965 |
|
old_item=(stackitem *)(old_value->content.ptr); |
966 |
|
|
967 |
|
while(old_item != NULL) { /* While list is not empty */ |
968 |
|
new_item= malloc(sizeof(stackitem)); |
969 |
|
new_item->item=copy_val(old_item->item); /* recurse */ |
970 |
|
new_item->next=NULL; |
971 |
|
if(prev_item != NULL) /* If this wasn't the first item */ |
972 |
|
prev_item->next=new_item; /* point the previous item to the |
973 |
|
new item */ |
974 |
|
else |
975 |
|
new_value->content.ptr=new_item; |
976 |
|
old_item=old_item->next; |
977 |
|
prev_item=new_item; |
978 |
|
} |
979 |
|
break; |
980 |
|
} |
981 |
|
return new_value; |
982 |
|
} |
983 |
|
|
984 |
|
/* duplicates an item on the stack */ |
985 |
|
extern void dup(environment *env) { |
986 |
|
if((env->head)==NULL) { |
987 |
|
printerr("Too Few Arguments"); |
988 |
|
env->err=1; |
989 |
|
return; |
990 |
|
} |
991 |
|
push_val(env, copy_val(env->head->item)); |
992 |
|
} |
993 |
|
|
994 |
|
/* "if", If-Then */ |
995 |
|
extern void sx_6966(environment *env) { |
996 |
|
|
997 |
|
int truth; |
998 |
|
|
999 |
|
if((env->head)==NULL || env->head->next==NULL) { |
1000 |
|
printerr("Too Few Arguments"); |
1001 |
|
env->err=1; |
1002 |
|
return; |
1003 |
|
} |
1004 |
|
|
1005 |
|
if(env->head->next->item->type != integer) { |
1006 |
|
printerr("Bad Argument Type"); |
1007 |
|
env->err=2; |
1008 |
|
return; |
1009 |
|
} |
1010 |
|
|
1011 |
|
swap(env); |
1012 |
|
if(env->err) return; |
1013 |
|
|
1014 |
|
truth=env->head->item->content.val; |
1015 |
|
|
1016 |
|
toss(env); |
1017 |
|
if(env->err) return; |
1018 |
|
|
1019 |
|
if(truth) |
1020 |
|
eval(env); |
1021 |
|
else |
1022 |
|
toss(env); |
1023 |
|
} |
1024 |
|
|
1025 |
|
/* If-Then-Else */ |
1026 |
|
extern void ifelse(environment *env) { |
1027 |
|
|
1028 |
|
int truth; |
1029 |
|
|
1030 |
|
if((env->head)==NULL || env->head->next==NULL |
1031 |
|
|| env->head->next->next==NULL) { |
1032 |
|
printerr("Too Few Arguments"); |
1033 |
|
env->err=1; |
1034 |
|
return; |
1035 |
|
} |
1036 |
|
|
1037 |
|
if(env->head->next->next->item->type != integer) { |
1038 |
|
printerr("Bad Argument Type"); |
1039 |
|
env->err=2; |
1040 |
|
return; |
1041 |
|
} |
1042 |
|
|
1043 |
|
rot(env); |
1044 |
|
if(env->err) return; |
1045 |
|
|
1046 |
|
truth=env->head->item->content.val; |
1047 |
|
|
1048 |
|
toss(env); |
1049 |
|
if(env->err) return; |
1050 |
|
|
1051 |
|
if(!truth) |
1052 |
|
swap(env); |
1053 |
|
if(env->err) return; |
1054 |
|
|
1055 |
|
toss(env); |
1056 |
|
if(env->err) return; |
1057 |
|
|
1058 |
|
eval(env); |
1059 |
|
} |
1060 |
|
|
1061 |
|
/* while */ |
1062 |
|
extern void sx_7768696c65(environment *env) { |
1063 |
|
|
1064 |
|
int truth; |
1065 |
|
value *loop, *test; |
1066 |
|
|
1067 |
|
if((env->head)==NULL || env->head->next==NULL) { |
1068 |
|
printerr("Too Few Arguments"); |
1069 |
|
env->err=1; |
1070 |
|
return; |
1071 |
|
} |
1072 |
|
|
1073 |
|
loop= env->head->item; |
1074 |
|
loop->refcount++; |
1075 |
|
toss(env); if(env->err) return; |
1076 |
|
|
1077 |
|
test= env->head->item; |
1078 |
|
test->refcount++; |
1079 |
|
toss(env); if(env->err) return; |
1080 |
|
|
1081 |
|
do { |
1082 |
|
push_val(env, test); |
1083 |
|
eval(env); |
1084 |
|
|
1085 |
|
if(env->head->item->type != integer) { |
1086 |
|
printerr("Bad Argument Type"); |
1087 |
|
env->err=2; |
1088 |
|
return; |
1089 |
|
} |
1090 |
|
|
1091 |
|
truth= env->head->item->content.val; |
1092 |
|
toss(env); if(env->err) return; |
1093 |
|
|
1094 |
|
if(truth) { |
1095 |
|
push_val(env, loop); |
1096 |
|
eval(env); |
1097 |
|
} else { |
1098 |
|
toss(env); |
1099 |
|
} |
1100 |
|
|
1101 |
|
} while(truth); |
1102 |
|
|
1103 |
|
free_val(test); |
1104 |
|
free_val(loop); |
1105 |
|
} |
1106 |
|
|
1107 |
|
/* For-loop */ |
1108 |
|
extern void sx_666f72(environment *env) { |
1109 |
|
|
1110 |
|
value *loop, *foo; |
1111 |
|
stackitem *iterator; |
1112 |
|
|
1113 |
|
if((env->head)==NULL || env->head->next==NULL) { |
1114 |
|
printerr("Too Few Arguments"); |
1115 |
|
env->err=1; |
1116 |
|
return; |
1117 |
|
} |
1118 |
|
|
1119 |
|
if(env->head->next->item->type != list) { |
1120 |
|
printerr("Bad Argument Type"); |
1121 |
|
env->err=2; |
1122 |
|
return; |
1123 |
|
} |
1124 |
|
|
1125 |
|
loop= env->head->item; |
1126 |
|
loop->refcount++; |
1127 |
|
toss(env); if(env->err) return; |
1128 |
|
|
1129 |
|
foo= env->head->item; |
1130 |
|
foo->refcount++; |
1131 |
|
toss(env); if(env->err) return; |
1132 |
|
|
1133 |
|
iterator= foo->content.ptr; |
1134 |
|
|
1135 |
|
while(iterator!=NULL) { |
1136 |
|
push_val(env, iterator->item); |
1137 |
|
push_val(env, loop); |
1138 |
|
eval(env); if(env->err) return; |
1139 |
|
iterator= iterator->next; |
1140 |
|
} |
1141 |
|
|
1142 |
|
free_val(loop); |
1143 |
|
free_val(foo); |
1144 |
|
} |
1145 |
|
|
1146 |
|
/* 'to' */ |
1147 |
|
extern void to(environment *env) { |
1148 |
|
int i, start, ending; |
1149 |
|
stackitem *temp_head; |
1150 |
|
value *temp_val; |
1151 |
|
|
1152 |
|
if((env->head)==NULL || env->head->next==NULL) { |
1153 |
|
printerr("Too Few Arguments"); |
1154 |
|
env->err=1; |
1155 |
|
return; |
1156 |
|
} |
1157 |
|
|
1158 |
|
if(env->head->item->type!=integer |
1159 |
|
|| env->head->next->item->type!=integer) { |
1160 |
|
printerr("Bad Argument Type"); |
1161 |
|
env->err=2; |
1162 |
|
return; |
1163 |
|
} |
1164 |
|
|
1165 |
|
ending= env->head->item->content.val; |
1166 |
|
toss(env); if(env->err) return; |
1167 |
|
start= env->head->item->content.val; |
1168 |
|
toss(env); if(env->err) return; |
1169 |
|
|
1170 |
|
temp_head= env->head; |
1171 |
|
env->head= NULL; |
1172 |
|
|
1173 |
|
if(ending>=start) { |
1174 |
|
for(i= ending; i>=start; i--) |
1175 |
|
push_int(env, i); |
1176 |
|
} else { |
1177 |
|
for(i= ending; i<=start; i++) |
1178 |
|
push_int(env, i); |
1179 |
|
} |
1180 |
|
|
1181 |
|
temp_val= malloc(sizeof(value)); |
1182 |
|
temp_val->content.ptr= env->head; |
1183 |
|
temp_val->refcount= 1; |
1184 |
|
temp_val->type= list; |
1185 |
|
env->head= temp_head; |
1186 |
|
push_val(env, temp_val); |
1187 |
|
} |
1188 |
|
|
1189 |
|
/* Read a string */ |
1190 |
|
extern void readline(environment *env) { |
1191 |
|
char in_string[101]; |
1192 |
|
|
1193 |
|
fgets(in_string, 100, stdin); |
1194 |
|
push_cstring(env, in_string); |
1195 |
|
} |
1196 |
|
|
1197 |
|
/* Read a value and place on stack */ |
1198 |
|
extern void read(environment *env) { |
1199 |
|
const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%n"; |
1200 |
|
const char strform[]= "\"%[^\"]\"%n"; |
1201 |
|
const char intform[]= "%i%n"; |
1202 |
|
const char blankform[]= "%*[ \t]%n"; |
1203 |
|
const char ebrackform[]= "%*1[]]%n"; |
1204 |
|
const char semicform[]= "%*1[;]%n"; |
1205 |
|
const char bbrackform[]= "%*1[[]%n"; |
1206 |
|
|
1207 |
|
int itemp, readlength= -1; |
1208 |
|
static int depth= 0; |
1209 |
|
char *rest, *match; |
1210 |
|
size_t inlength; |
1211 |
|
|
1212 |
|
if(env->in_string==NULL) { |
1213 |
|
readline(env); if(env->err) return; |
1214 |
|
|
1215 |
|
env->in_string= malloc(strlen(env->head->item->content.ptr)+1); |
1216 |
|
env->free_string= env->in_string; /* Save the original pointer */ |
1217 |
|
strcpy(env->in_string, env->head->item->content.ptr); |
1218 |
|
toss(env); if(env->err) return; |
1219 |
|
} |
1220 |
|
|
1221 |
|
inlength= strlen(env->in_string)+1; |
1222 |
|
match= malloc(inlength); |
1223 |
|
rest= malloc(inlength); |
1224 |
|
|
1225 |
|
if(sscanf(env->in_string, blankform, &readlength)!=EOF |
1226 |
|
&& readlength != -1) { |
1227 |
|
; |
1228 |
|
} else if(sscanf(env->in_string, intform, &itemp, &readlength) != EOF |
1229 |
|
&& readlength != -1) { |
1230 |
|
push_int(env, itemp); |
1231 |
|
} else if(sscanf(env->in_string, strform, match, &readlength) != EOF |
1232 |
|
&& readlength != -1) { |
1233 |
|
push_cstring(env, match); |
1234 |
|
} else if(sscanf(env->in_string, symbform, match, &readlength) != EOF |
1235 |
|
&& readlength != -1) { |
1236 |
|
push_sym(env, match); |
1237 |
|
} else if(sscanf(env->in_string, ebrackform, &readlength) != EOF |
1238 |
|
&& readlength != -1) { |
1239 |
|
pack(env); if(env->err) return; |
1240 |
|
if(depth != 0) depth--; |
1241 |
|
} else if(sscanf(env->in_string, semicform, &readlength) != EOF |
1242 |
|
&& readlength != -1) { |
1243 |
|
push_sym(env, ";"); |
1244 |
|
} else if(sscanf(env->in_string, bbrackform, &readlength) != EOF |
1245 |
|
&& readlength != -1) { |
1246 |
|
push_sym(env, "["); |
1247 |
|
depth++; |
1248 |
|
} else { |
1249 |
|
free(env->free_string); |
1250 |
|
env->in_string = env->free_string = NULL; |
1251 |
|
free(match); |
1252 |
|
} |
1253 |
|
if ( env->in_string != NULL) { |
1254 |
|
env->in_string += readlength; |
1255 |
|
} |
1256 |
|
|
1257 |
|
if(depth) |
1258 |
|
return read(env); |
1259 |
} |
} |