1 |
teddy |
1.84 |
/* printf, sscanf, fgets, fprintf, fopen, perror */ |
2 |
masse |
1.1 |
#include <stdio.h> |
3 |
teddy |
1.52 |
/* exit, EXIT_SUCCESS, malloc, free */ |
4 |
masse |
1.1 |
#include <stdlib.h> |
5 |
|
|
/* NULL */ |
6 |
|
|
#include <stddef.h> |
7 |
teddy |
1.3 |
/* dlopen, dlsym, dlerror */ |
8 |
masse |
1.1 |
#include <dlfcn.h> |
9 |
teddy |
1.52 |
/* strcmp, strcpy, strlen, strcat, strdup */ |
10 |
masse |
1.47 |
#include <string.h> |
11 |
teddy |
1.84 |
/* getopt, STDIN_FILENO, STDOUT_FILENO */ |
12 |
|
|
#include <unistd.h> |
13 |
|
|
/* EX_NOINPUT, EX_USAGE */ |
14 |
|
|
#include <sysexits.h> |
15 |
masse |
1.83 |
/* mtrace, muntrace */ |
16 |
|
|
#include <mcheck.h> |
17 |
masse |
1.1 |
|
18 |
masse |
1.72 |
#define HASHTBLSIZE 2048 |
19 |
masse |
1.1 |
|
20 |
teddy |
1.28 |
/* First, define some types. */ |
21 |
|
|
|
22 |
|
|
/* A value of some type */ |
23 |
|
|
typedef struct { |
24 |
masse |
1.16 |
enum { |
25 |
teddy |
1.28 |
integer, |
26 |
teddy |
1.18 |
string, |
27 |
masse |
1.16 |
func, /* Function pointer */ |
28 |
teddy |
1.28 |
symb, |
29 |
masse |
1.16 |
list |
30 |
teddy |
1.18 |
} type; /* Type of stack element */ |
31 |
|
|
|
32 |
masse |
1.1 |
union { |
33 |
teddy |
1.28 |
void *ptr; /* Pointer to the content */ |
34 |
masse |
1.16 |
int val; /* ...or an integer */ |
35 |
|
|
} content; /* Stores a pointer or an integer */ |
36 |
masse |
1.1 |
|
37 |
teddy |
1.28 |
int refcount; /* Reference counter */ |
38 |
|
|
|
39 |
|
|
} value; |
40 |
|
|
|
41 |
|
|
/* A symbol with a name and possible value */ |
42 |
|
|
/* (These do not need reference counters, they are kept unique by |
43 |
|
|
hashing.) */ |
44 |
|
|
typedef struct symbol_struct { |
45 |
|
|
char *id; /* Symbol name */ |
46 |
|
|
value *val; /* The value (if any) bound to it */ |
47 |
|
|
struct symbol_struct *next; /* In case of hashing conflicts, a */ |
48 |
|
|
} symbol; /* symbol is a kind of stack item. */ |
49 |
|
|
|
50 |
|
|
/* A type for a hash table for symbols */ |
51 |
|
|
typedef symbol *hashtbl[HASHTBLSIZE]; /* Hash table declaration */ |
52 |
|
|
|
53 |
|
|
/* An item (value) on a stack */ |
54 |
|
|
typedef struct stackitem_struct |
55 |
|
|
{ |
56 |
|
|
value *item; /* The value on the stack */ |
57 |
teddy |
1.56 |
/* (This is never NULL) */ |
58 |
teddy |
1.28 |
struct stackitem_struct *next; /* Next item */ |
59 |
masse |
1.1 |
} stackitem; |
60 |
|
|
|
61 |
teddy |
1.28 |
/* An environment; gives access to the stack and a hash table of |
62 |
|
|
defined symbols */ |
63 |
|
|
typedef struct { |
64 |
|
|
stackitem *head; /* Head of the stack */ |
65 |
|
|
hashtbl symbols; /* Hash table of all variable bindings */ |
66 |
teddy |
1.33 |
int err; /* Error flag */ |
67 |
masse |
1.70 |
char *in_string; /* Input pending to be read */ |
68 |
teddy |
1.78 |
char *free_string; /* Free this string when all input is |
69 |
|
|
read from in_string */ |
70 |
teddy |
1.84 |
FILE *inputstream; /* stdin or a file, most likely */ |
71 |
|
|
int interactive; /* print prompts, stack, etc */ |
72 |
teddy |
1.28 |
} environment; |
73 |
|
|
|
74 |
|
|
/* A type for pointers to external functions */ |
75 |
|
|
typedef void (*funcp)(environment *); /* funcp is a pointer to a void |
76 |
|
|
function (environment *) */ |
77 |
masse |
1.1 |
|
78 |
teddy |
1.28 |
/* Initialize a newly created environment */ |
79 |
|
|
void init_env(environment *env) |
80 |
masse |
1.1 |
{ |
81 |
masse |
1.46 |
int i; |
82 |
masse |
1.1 |
|
83 |
teddy |
1.84 |
env->head= NULL; |
84 |
masse |
1.1 |
for(i= 0; i<HASHTBLSIZE; i++) |
85 |
teddy |
1.28 |
env->symbols[i]= NULL; |
86 |
teddy |
1.84 |
env->err= 0; |
87 |
|
|
env->in_string= NULL; |
88 |
|
|
env->free_string= NULL; |
89 |
|
|
env->inputstream= stdin; |
90 |
|
|
env->interactive= 1; |
91 |
masse |
1.1 |
} |
92 |
|
|
|
93 |
teddy |
1.48 |
void printerr(const char* in_string) { |
94 |
|
|
fprintf(stderr, "Err: %s\n", in_string); |
95 |
|
|
} |
96 |
|
|
|
97 |
|
|
/* Throw away a value */ |
98 |
|
|
void free_val(value *val){ |
99 |
|
|
stackitem *item, *temp; |
100 |
|
|
|
101 |
|
|
val->refcount--; /* Decrease the reference count */ |
102 |
|
|
if(val->refcount == 0){ |
103 |
|
|
switch (val->type){ /* and free the contents if necessary */ |
104 |
|
|
case string: |
105 |
|
|
free(val->content.ptr); |
106 |
|
|
break; |
107 |
|
|
case list: /* lists needs to be freed recursively */ |
108 |
|
|
item=val->content.ptr; |
109 |
|
|
while(item != NULL) { /* for all stack items */ |
110 |
|
|
free_val(item->item); /* free the value */ |
111 |
|
|
temp=item->next; /* save next ptr */ |
112 |
|
|
free(item); /* free the stackitem */ |
113 |
|
|
item=temp; /* go to next stackitem */ |
114 |
|
|
} |
115 |
|
|
break; |
116 |
teddy |
1.54 |
case integer: |
117 |
|
|
case func: |
118 |
masse |
1.82 |
break; |
119 |
teddy |
1.54 |
case symb: |
120 |
masse |
1.82 |
free(((symbol*)(val->content.ptr))->id); |
121 |
|
|
if(((symbol*)(val->content.ptr))->val!=NULL) |
122 |
|
|
free_val(((symbol*)(val->content.ptr))->val); |
123 |
|
|
free(val->content.ptr); |
124 |
teddy |
1.48 |
break; |
125 |
|
|
} |
126 |
masse |
1.83 |
free(val); /* Free the actual value structure */ |
127 |
teddy |
1.48 |
} |
128 |
|
|
} |
129 |
|
|
|
130 |
|
|
/* Discard the top element of the stack. */ |
131 |
|
|
extern void toss(environment *env) |
132 |
|
|
{ |
133 |
|
|
stackitem *temp= env->head; |
134 |
|
|
|
135 |
|
|
if((env->head)==NULL) { |
136 |
|
|
printerr("Too Few Arguments"); |
137 |
|
|
env->err=1; |
138 |
|
|
return; |
139 |
|
|
} |
140 |
|
|
|
141 |
|
|
free_val(env->head->item); /* Free the value */ |
142 |
|
|
env->head= env->head->next; /* Remove the top stack item */ |
143 |
|
|
free(temp); /* Free the old top stack item */ |
144 |
|
|
} |
145 |
|
|
|
146 |
teddy |
1.27 |
/* Returns a pointer to a pointer to an element in the hash table. */ |
147 |
teddy |
1.28 |
symbol **hash(hashtbl in_hashtbl, const char *in_string) |
148 |
masse |
1.1 |
{ |
149 |
masse |
1.46 |
int i= 0; |
150 |
|
|
unsigned int out_hash= 0; |
151 |
teddy |
1.18 |
char key= '\0'; |
152 |
teddy |
1.28 |
symbol **position; |
153 |
masse |
1.1 |
|
154 |
masse |
1.16 |
while(1){ /* Hash in_string */ |
155 |
masse |
1.1 |
key= in_string[i++]; |
156 |
|
|
if(key=='\0') |
157 |
|
|
break; |
158 |
|
|
out_hash= out_hash*32+key; |
159 |
|
|
} |
160 |
|
|
|
161 |
|
|
out_hash= out_hash%HASHTBLSIZE; |
162 |
|
|
position= &(in_hashtbl[out_hash]); |
163 |
|
|
|
164 |
masse |
1.25 |
while(1){ |
165 |
teddy |
1.18 |
if(*position==NULL) /* If empty */ |
166 |
masse |
1.1 |
return position; |
167 |
|
|
|
168 |
teddy |
1.18 |
if(strcmp(in_string, (*position)->id)==0) /* If match */ |
169 |
masse |
1.1 |
return position; |
170 |
|
|
|
171 |
masse |
1.16 |
position= &((*position)->next); /* Try next */ |
172 |
masse |
1.1 |
} |
173 |
|
|
} |
174 |
|
|
|
175 |
teddy |
1.29 |
/* Push a value onto the stack */ |
176 |
masse |
1.72 |
void push_val(environment *env, value *val) |
177 |
teddy |
1.29 |
{ |
178 |
|
|
stackitem *new_item= malloc(sizeof(stackitem)); |
179 |
|
|
new_item->item= val; |
180 |
|
|
val->refcount++; |
181 |
masse |
1.75 |
new_item->next= env->head; |
182 |
|
|
env->head= new_item; |
183 |
teddy |
1.29 |
} |
184 |
|
|
|
185 |
teddy |
1.28 |
/* Push an integer onto the stack. */ |
186 |
masse |
1.72 |
void push_int(environment *env, int in_val) |
187 |
masse |
1.1 |
{ |
188 |
teddy |
1.28 |
value *new_value= malloc(sizeof(value)); |
189 |
|
|
|
190 |
|
|
new_value->content.val= in_val; |
191 |
|
|
new_value->type= integer; |
192 |
masse |
1.83 |
new_value->refcount= 0; |
193 |
masse |
1.1 |
|
194 |
masse |
1.75 |
push_val(env, new_value); |
195 |
masse |
1.1 |
} |
196 |
|
|
|
197 |
masse |
1.14 |
/* Copy a string onto the stack. */ |
198 |
masse |
1.72 |
void push_cstring(environment *env, const char *in_string) |
199 |
masse |
1.1 |
{ |
200 |
teddy |
1.28 |
value *new_value= malloc(sizeof(value)); |
201 |
|
|
|
202 |
|
|
new_value->content.ptr= malloc(strlen(in_string)+1); |
203 |
|
|
strcpy(new_value->content.ptr, in_string); |
204 |
|
|
new_value->type= string; |
205 |
masse |
1.83 |
new_value->refcount= 0; |
206 |
masse |
1.1 |
|
207 |
masse |
1.75 |
push_val(env, new_value); |
208 |
masse |
1.1 |
} |
209 |
|
|
|
210 |
teddy |
1.48 |
/* Mangle a symbol name to a valid C identifier name */ |
211 |
teddy |
1.51 |
char *mangle_str(const char *old_string){ |
212 |
teddy |
1.48 |
char validchars[] |
213 |
|
|
="0123456789abcdef"; |
214 |
|
|
char *new_string, *current; |
215 |
|
|
|
216 |
teddy |
1.50 |
new_string=malloc((strlen(old_string)*2)+4); |
217 |
teddy |
1.48 |
strcpy(new_string, "sx_"); /* Stack eXternal */ |
218 |
|
|
current=new_string+3; |
219 |
|
|
while(old_string[0] != '\0'){ |
220 |
teddy |
1.53 |
current[0]=validchars[(unsigned char)(old_string[0])/16]; |
221 |
|
|
current[1]=validchars[(unsigned char)(old_string[0])%16]; |
222 |
teddy |
1.48 |
current+=2; |
223 |
|
|
old_string++; |
224 |
|
|
} |
225 |
|
|
current[0]='\0'; |
226 |
|
|
|
227 |
|
|
return new_string; /* The caller must free() it */ |
228 |
|
|
} |
229 |
|
|
|
230 |
|
|
extern void mangle(environment *env){ |
231 |
|
|
char *new_string; |
232 |
|
|
|
233 |
|
|
if((env->head)==NULL) { |
234 |
|
|
printerr("Too Few Arguments"); |
235 |
|
|
env->err=1; |
236 |
|
|
return; |
237 |
|
|
} |
238 |
|
|
|
239 |
|
|
if(env->head->item->type!=string) { |
240 |
|
|
printerr("Bad Argument Type"); |
241 |
|
|
env->err=2; |
242 |
|
|
return; |
243 |
|
|
} |
244 |
|
|
|
245 |
teddy |
1.51 |
new_string= mangle_str((const char *)(env->head->item->content.ptr)); |
246 |
teddy |
1.48 |
|
247 |
|
|
toss(env); |
248 |
|
|
if(env->err) return; |
249 |
|
|
|
250 |
masse |
1.81 |
push_cstring(env, new_string); |
251 |
teddy |
1.48 |
} |
252 |
|
|
|
253 |
teddy |
1.28 |
/* Push a symbol onto the stack. */ |
254 |
teddy |
1.35 |
void push_sym(environment *env, const char *in_string) |
255 |
masse |
1.1 |
{ |
256 |
teddy |
1.28 |
value *new_value; /* A new symbol value */ |
257 |
|
|
/* ...which might point to... */ |
258 |
teddy |
1.29 |
symbol **new_symbol; /* (if needed) A new actual symbol */ |
259 |
teddy |
1.28 |
/* ...which, if possible, will be bound to... */ |
260 |
|
|
value *new_fvalue; /* (if needed) A new function value */ |
261 |
|
|
/* ...which will point to... */ |
262 |
|
|
void *funcptr; /* A function pointer */ |
263 |
|
|
|
264 |
|
|
static void *handle= NULL; /* Dynamic linker handle */ |
265 |
teddy |
1.48 |
const char *dlerr; /* Dynamic linker error */ |
266 |
|
|
char *mangled; /* Mangled function name */ |
267 |
teddy |
1.28 |
|
268 |
|
|
new_value= malloc(sizeof(value)); |
269 |
|
|
|
270 |
|
|
/* The new value is a symbol */ |
271 |
|
|
new_value->type= symb; |
272 |
|
|
new_value->refcount= 1; |
273 |
|
|
|
274 |
|
|
/* Look up the symbol name in the hash table */ |
275 |
teddy |
1.29 |
new_symbol= hash(env->symbols, in_string); |
276 |
|
|
new_value->content.ptr= *new_symbol; |
277 |
teddy |
1.28 |
|
278 |
teddy |
1.30 |
if(*new_symbol==NULL) { /* If symbol was undefined */ |
279 |
teddy |
1.28 |
|
280 |
|
|
/* Create a new symbol */ |
281 |
teddy |
1.30 |
(*new_symbol)= malloc(sizeof(symbol)); |
282 |
teddy |
1.29 |
(*new_symbol)->val= NULL; /* undefined value */ |
283 |
|
|
(*new_symbol)->next= NULL; |
284 |
|
|
(*new_symbol)->id= malloc(strlen(in_string)+1); |
285 |
|
|
strcpy((*new_symbol)->id, in_string); |
286 |
masse |
1.1 |
|
287 |
teddy |
1.28 |
/* Intern the new symbol in the hash table */ |
288 |
teddy |
1.29 |
new_value->content.ptr= *new_symbol; |
289 |
masse |
1.1 |
|
290 |
teddy |
1.28 |
/* Try to load the symbol name as an external function, to see if |
291 |
|
|
we should bind the symbol to a new function pointer value */ |
292 |
masse |
1.16 |
if(handle==NULL) /* If no handle */ |
293 |
teddy |
1.28 |
handle= dlopen(NULL, RTLD_LAZY); |
294 |
masse |
1.6 |
|
295 |
teddy |
1.86 |
mangled=mangle_str(in_string); /* mangle the name */ |
296 |
|
|
funcptr= dlsym(handle, mangled); /* and try to find it */ |
297 |
|
|
free(mangled); |
298 |
teddy |
1.48 |
dlerr=dlerror(); |
299 |
|
|
if(dlerr != NULL) { /* If no function was found */ |
300 |
teddy |
1.86 |
funcptr= dlsym(handle, in_string); /* Get function pointer */ |
301 |
teddy |
1.48 |
dlerr=dlerror(); |
302 |
|
|
} |
303 |
|
|
if(dlerr==NULL) { /* If a function was found */ |
304 |
teddy |
1.28 |
new_fvalue= malloc(sizeof(value)); /* Create a new value */ |
305 |
|
|
new_fvalue->type=func; /* The new value is a function pointer */ |
306 |
|
|
new_fvalue->content.ptr=funcptr; /* Store function pointer */ |
307 |
teddy |
1.29 |
(*new_symbol)->val= new_fvalue; /* Bind the symbol to the new |
308 |
|
|
function value */ |
309 |
teddy |
1.28 |
new_fvalue->refcount= 1; |
310 |
|
|
} |
311 |
masse |
1.1 |
} |
312 |
masse |
1.75 |
push_val(env, new_value); |
313 |
masse |
1.1 |
} |
314 |
|
|
|
315 |
masse |
1.14 |
/* Print newline. */ |
316 |
masse |
1.34 |
extern void nl() |
317 |
masse |
1.8 |
{ |
318 |
|
|
printf("\n"); |
319 |
|
|
} |
320 |
masse |
1.1 |
|
321 |
teddy |
1.37 |
/* Gets the type of a value */ |
322 |
|
|
extern void type(environment *env){ |
323 |
|
|
int typenum; |
324 |
|
|
|
325 |
|
|
if((env->head)==NULL) { |
326 |
|
|
printerr("Too Few Arguments"); |
327 |
|
|
env->err=1; |
328 |
|
|
return; |
329 |
|
|
} |
330 |
|
|
typenum=env->head->item->type; |
331 |
|
|
toss(env); |
332 |
|
|
switch(typenum){ |
333 |
|
|
case integer: |
334 |
|
|
push_sym(env, "integer"); |
335 |
|
|
break; |
336 |
|
|
case string: |
337 |
|
|
push_sym(env, "string"); |
338 |
|
|
break; |
339 |
|
|
case symb: |
340 |
|
|
push_sym(env, "symbol"); |
341 |
|
|
break; |
342 |
|
|
case func: |
343 |
|
|
push_sym(env, "function"); |
344 |
|
|
break; |
345 |
|
|
case list: |
346 |
|
|
push_sym(env, "list"); |
347 |
|
|
break; |
348 |
|
|
} |
349 |
|
|
} |
350 |
|
|
|
351 |
masse |
1.14 |
/* Prints the top element of the stack. */ |
352 |
teddy |
1.80 |
void print_h(stackitem *stack_head, int noquote) |
353 |
masse |
1.8 |
{ |
354 |
teddy |
1.28 |
switch(stack_head->item->type) { |
355 |
|
|
case integer: |
356 |
|
|
printf("%d", stack_head->item->content.val); |
357 |
teddy |
1.2 |
break; |
358 |
|
|
case string: |
359 |
teddy |
1.80 |
if(noquote) |
360 |
|
|
printf("%s", (char*)stack_head->item->content.ptr); |
361 |
|
|
else |
362 |
|
|
printf("\"%s\"", (char*)stack_head->item->content.ptr); |
363 |
teddy |
1.2 |
break; |
364 |
teddy |
1.28 |
case symb: |
365 |
teddy |
1.45 |
printf("%s", ((symbol *)(stack_head->item->content.ptr))->id); |
366 |
masse |
1.6 |
break; |
367 |
teddy |
1.35 |
case func: |
368 |
|
|
printf("#<function %p>", (funcp)(stack_head->item->content.ptr)); |
369 |
|
|
break; |
370 |
|
|
case list: |
371 |
teddy |
1.38 |
/* A list is just a stack, so make stack_head point to it */ |
372 |
|
|
stack_head=(stackitem *)(stack_head->item->content.ptr); |
373 |
|
|
printf("[ "); |
374 |
|
|
while(stack_head != NULL) { |
375 |
teddy |
1.80 |
print_h(stack_head, noquote); |
376 |
teddy |
1.38 |
printf(" "); |
377 |
|
|
stack_head=stack_head->next; |
378 |
|
|
} |
379 |
teddy |
1.39 |
printf("]"); |
380 |
teddy |
1.35 |
break; |
381 |
teddy |
1.2 |
} |
382 |
masse |
1.1 |
} |
383 |
|
|
|
384 |
teddy |
1.28 |
extern void print_(environment *env) { |
385 |
teddy |
1.35 |
if(env->head==NULL) { |
386 |
teddy |
1.36 |
printerr("Too Few Arguments"); |
387 |
teddy |
1.35 |
env->err=1; |
388 |
|
|
return; |
389 |
|
|
} |
390 |
teddy |
1.80 |
print_h(env->head, 0); |
391 |
|
|
nl(); |
392 |
teddy |
1.28 |
} |
393 |
|
|
|
394 |
masse |
1.14 |
/* Prints the top element of the stack and then discards it. */ |
395 |
teddy |
1.28 |
extern void print(environment *env) |
396 |
masse |
1.8 |
{ |
397 |
teddy |
1.28 |
print_(env); |
398 |
teddy |
1.35 |
if(env->err) return; |
399 |
teddy |
1.28 |
toss(env); |
400 |
masse |
1.8 |
} |
401 |
|
|
|
402 |
teddy |
1.80 |
extern void princ_(environment *env) { |
403 |
|
|
if(env->head==NULL) { |
404 |
|
|
printerr("Too Few Arguments"); |
405 |
|
|
env->err=1; |
406 |
|
|
return; |
407 |
|
|
} |
408 |
|
|
print_h(env->head, 1); |
409 |
|
|
} |
410 |
|
|
|
411 |
|
|
/* Prints the top element of the stack and then discards it. */ |
412 |
|
|
extern void princ(environment *env) |
413 |
|
|
{ |
414 |
|
|
princ_(env); |
415 |
|
|
if(env->err) return; |
416 |
|
|
toss(env); |
417 |
|
|
} |
418 |
|
|
|
419 |
masse |
1.14 |
/* Only to be called by function printstack. */ |
420 |
teddy |
1.28 |
void print_st(stackitem *stack_head, long counter) |
421 |
masse |
1.8 |
{ |
422 |
|
|
if(stack_head->next != NULL) |
423 |
|
|
print_st(stack_head->next, counter+1); |
424 |
|
|
printf("%ld: ", counter); |
425 |
teddy |
1.80 |
print_h(stack_head, 0); |
426 |
masse |
1.8 |
nl(); |
427 |
|
|
} |
428 |
|
|
|
429 |
masse |
1.14 |
/* Prints the stack. */ |
430 |
teddy |
1.28 |
extern void printstack(environment *env) |
431 |
masse |
1.1 |
{ |
432 |
teddy |
1.35 |
if(env->head == NULL) { |
433 |
teddy |
1.80 |
printf("Stack Empty\n"); |
434 |
teddy |
1.35 |
return; |
435 |
masse |
1.1 |
} |
436 |
teddy |
1.35 |
print_st(env->head, 1); |
437 |
masse |
1.1 |
} |
438 |
|
|
|
439 |
masse |
1.26 |
/* Swap the two top elements on the stack. */ |
440 |
teddy |
1.28 |
extern void swap(environment *env) |
441 |
masse |
1.26 |
{ |
442 |
teddy |
1.28 |
stackitem *temp= env->head; |
443 |
masse |
1.26 |
|
444 |
masse |
1.46 |
if(env->head==NULL || env->head->next==NULL) { |
445 |
teddy |
1.36 |
printerr("Too Few Arguments"); |
446 |
teddy |
1.35 |
env->err=1; |
447 |
masse |
1.26 |
return; |
448 |
teddy |
1.28 |
} |
449 |
masse |
1.26 |
|
450 |
teddy |
1.28 |
env->head= env->head->next; |
451 |
|
|
temp->next= env->head->next; |
452 |
|
|
env->head->next= temp; |
453 |
masse |
1.26 |
} |
454 |
|
|
|
455 |
teddy |
1.56 |
/* Rotate the first three elements on the stack. */ |
456 |
|
|
extern void rot(environment *env) |
457 |
|
|
{ |
458 |
|
|
stackitem *temp= env->head; |
459 |
|
|
|
460 |
|
|
if(env->head==NULL || env->head->next==NULL |
461 |
|
|
|| env->head->next->next==NULL) { |
462 |
|
|
printerr("Too Few Arguments"); |
463 |
|
|
env->err=1; |
464 |
|
|
return; |
465 |
|
|
} |
466 |
|
|
|
467 |
|
|
env->head= env->head->next->next; |
468 |
|
|
temp->next->next= env->head->next; |
469 |
|
|
env->head->next= temp; |
470 |
|
|
} |
471 |
|
|
|
472 |
teddy |
1.33 |
/* Recall a value from a symbol, if bound */ |
473 |
teddy |
1.31 |
extern void rcl(environment *env) |
474 |
|
|
{ |
475 |
|
|
value *val; |
476 |
|
|
|
477 |
|
|
if(env->head == NULL) { |
478 |
teddy |
1.36 |
printerr("Too Few Arguments"); |
479 |
teddy |
1.35 |
env->err=1; |
480 |
teddy |
1.31 |
return; |
481 |
|
|
} |
482 |
|
|
|
483 |
|
|
if(env->head->item->type!=symb) { |
484 |
teddy |
1.36 |
printerr("Bad Argument Type"); |
485 |
|
|
env->err=2; |
486 |
teddy |
1.31 |
return; |
487 |
|
|
} |
488 |
teddy |
1.35 |
|
489 |
teddy |
1.31 |
val=((symbol *)(env->head->item->content.ptr))->val; |
490 |
teddy |
1.33 |
if(val == NULL){ |
491 |
teddy |
1.36 |
printerr("Unbound Variable"); |
492 |
|
|
env->err=3; |
493 |
teddy |
1.33 |
return; |
494 |
|
|
} |
495 |
teddy |
1.31 |
toss(env); /* toss the symbol */ |
496 |
teddy |
1.35 |
if(env->err) return; |
497 |
masse |
1.72 |
push_val(env, val); /* Return its bound value */ |
498 |
teddy |
1.31 |
} |
499 |
masse |
1.26 |
|
500 |
teddy |
1.29 |
/* If the top element is a symbol, determine if it's bound to a |
501 |
|
|
function value, and if it is, toss the symbol and execute the |
502 |
|
|
function. */ |
503 |
teddy |
1.28 |
extern void eval(environment *env) |
504 |
masse |
1.1 |
{ |
505 |
|
|
funcp in_func; |
506 |
masse |
1.44 |
value* temp_val; |
507 |
|
|
stackitem* iterator; |
508 |
|
|
|
509 |
teddy |
1.80 |
eval_start: |
510 |
|
|
|
511 |
teddy |
1.29 |
if(env->head==NULL) { |
512 |
teddy |
1.36 |
printerr("Too Few Arguments"); |
513 |
teddy |
1.35 |
env->err=1; |
514 |
masse |
1.1 |
return; |
515 |
masse |
1.17 |
} |
516 |
masse |
1.1 |
|
517 |
masse |
1.46 |
switch(env->head->item->type) { |
518 |
|
|
/* if it's a symbol */ |
519 |
|
|
case symb: |
520 |
teddy |
1.35 |
rcl(env); /* get its contents */ |
521 |
|
|
if(env->err) return; |
522 |
|
|
if(env->head->item->type!=symb){ /* don't recurse symbols */ |
523 |
teddy |
1.64 |
goto eval_start; |
524 |
teddy |
1.29 |
} |
525 |
teddy |
1.59 |
return; |
526 |
masse |
1.22 |
|
527 |
masse |
1.46 |
/* If it's a lone function value, run it */ |
528 |
|
|
case func: |
529 |
teddy |
1.29 |
in_func= (funcp)(env->head->item->content.ptr); |
530 |
teddy |
1.28 |
toss(env); |
531 |
teddy |
1.35 |
if(env->err) return; |
532 |
teddy |
1.59 |
return (*in_func)(env); |
533 |
masse |
1.44 |
|
534 |
masse |
1.46 |
/* If it's a list */ |
535 |
|
|
case list: |
536 |
masse |
1.44 |
temp_val= env->head->item; |
537 |
|
|
env->head->item->refcount++; |
538 |
|
|
toss(env); |
539 |
|
|
if(env->err) return; |
540 |
|
|
iterator= (stackitem*)temp_val->content.ptr; |
541 |
teddy |
1.59 |
while(iterator!=NULL) { |
542 |
masse |
1.72 |
push_val(env, iterator->item); |
543 |
masse |
1.44 |
if(env->head->item->type==symb |
544 |
|
|
&& strcmp(";", ((symbol*)(env->head->item->content.ptr))->id)==0) { |
545 |
|
|
toss(env); |
546 |
|
|
if(env->err) return; |
547 |
teddy |
1.59 |
if(iterator->next == NULL){ |
548 |
|
|
free_val(temp_val); |
549 |
teddy |
1.64 |
goto eval_start; |
550 |
teddy |
1.59 |
} |
551 |
masse |
1.44 |
eval(env); |
552 |
masse |
1.46 |
if(env->err) return; |
553 |
masse |
1.44 |
} |
554 |
|
|
iterator= iterator->next; |
555 |
|
|
} |
556 |
|
|
free_val(temp_val); |
557 |
teddy |
1.59 |
return; |
558 |
masse |
1.46 |
|
559 |
masse |
1.71 |
default: |
560 |
teddy |
1.59 |
return; |
561 |
masse |
1.26 |
} |
562 |
masse |
1.1 |
} |
563 |
|
|
|
564 |
masse |
1.44 |
/* Reverse (flip) a list */ |
565 |
teddy |
1.40 |
extern void rev(environment *env){ |
566 |
teddy |
1.78 |
stackitem *old_head, *new_head, *item; |
567 |
teddy |
1.40 |
|
568 |
|
|
if((env->head)==NULL) { |
569 |
|
|
printerr("Too Few Arguments"); |
570 |
|
|
env->err=1; |
571 |
|
|
return; |
572 |
|
|
} |
573 |
|
|
|
574 |
|
|
if(env->head->item->type!=list) { |
575 |
|
|
printerr("Bad Argument Type"); |
576 |
|
|
env->err=2; |
577 |
|
|
return; |
578 |
|
|
} |
579 |
|
|
|
580 |
teddy |
1.78 |
old_head=(stackitem *)(env->head->item->content.ptr); |
581 |
|
|
new_head=NULL; |
582 |
|
|
while(old_head != NULL){ |
583 |
|
|
item=old_head; |
584 |
|
|
old_head=old_head->next; |
585 |
|
|
item->next=new_head; |
586 |
|
|
new_head=item; |
587 |
teddy |
1.40 |
} |
588 |
teddy |
1.78 |
env->head->item->content.ptr=new_head; |
589 |
teddy |
1.40 |
} |
590 |
|
|
|
591 |
masse |
1.19 |
/* Make a list. */ |
592 |
teddy |
1.28 |
extern void pack(environment *env) |
593 |
masse |
1.19 |
{ |
594 |
teddy |
1.28 |
stackitem *iterator, *temp; |
595 |
|
|
value *pack; |
596 |
masse |
1.19 |
|
597 |
teddy |
1.28 |
iterator= env->head; |
598 |
masse |
1.19 |
|
599 |
masse |
1.73 |
if(iterator==NULL |
600 |
|
|
|| (iterator->item->type==symb |
601 |
|
|
&& ((symbol*)(iterator->item->content.ptr))->id[0]=='[')) { |
602 |
masse |
1.24 |
temp= NULL; |
603 |
teddy |
1.28 |
toss(env); |
604 |
masse |
1.24 |
} else { |
605 |
|
|
/* Search for first delimiter */ |
606 |
teddy |
1.28 |
while(iterator->next!=NULL |
607 |
masse |
1.73 |
&& (iterator->next->item->type!=symb |
608 |
|
|
|| ((symbol*)(iterator->next->item->content.ptr))->id[0]!='[')) |
609 |
masse |
1.24 |
iterator= iterator->next; |
610 |
|
|
|
611 |
|
|
/* Extract list */ |
612 |
teddy |
1.28 |
temp= env->head; |
613 |
|
|
env->head= iterator->next; |
614 |
masse |
1.24 |
iterator->next= NULL; |
615 |
|
|
|
616 |
teddy |
1.28 |
if(env->head!=NULL) |
617 |
|
|
toss(env); |
618 |
masse |
1.24 |
} |
619 |
masse |
1.19 |
|
620 |
|
|
/* Push list */ |
621 |
teddy |
1.28 |
pack= malloc(sizeof(value)); |
622 |
masse |
1.19 |
pack->type= list; |
623 |
|
|
pack->content.ptr= temp; |
624 |
masse |
1.83 |
pack->refcount= 0; |
625 |
teddy |
1.28 |
|
626 |
masse |
1.74 |
push_val(env, pack); |
627 |
teddy |
1.40 |
rev(env); |
628 |
masse |
1.19 |
} |
629 |
|
|
|
630 |
masse |
1.16 |
/* Relocate elements of the list on the stack. */ |
631 |
teddy |
1.28 |
extern void expand(environment *env) |
632 |
masse |
1.1 |
{ |
633 |
masse |
1.8 |
stackitem *temp, *new_head; |
634 |
|
|
|
635 |
masse |
1.16 |
/* Is top element a list? */ |
636 |
teddy |
1.36 |
if(env->head==NULL) { |
637 |
|
|
printerr("Too Few Arguments"); |
638 |
teddy |
1.35 |
env->err=1; |
639 |
masse |
1.8 |
return; |
640 |
masse |
1.17 |
} |
641 |
teddy |
1.36 |
if(env->head->item->type!=list) { |
642 |
|
|
printerr("Bad Argument Type"); |
643 |
|
|
env->err=2; |
644 |
|
|
return; |
645 |
|
|
} |
646 |
masse |
1.43 |
|
647 |
|
|
rev(env); |
648 |
|
|
|
649 |
|
|
if(env->err) |
650 |
|
|
return; |
651 |
masse |
1.8 |
|
652 |
masse |
1.16 |
/* The first list element is the new stack head */ |
653 |
teddy |
1.28 |
new_head= temp= env->head->item->content.ptr; |
654 |
masse |
1.8 |
|
655 |
teddy |
1.28 |
env->head->item->refcount++; |
656 |
|
|
toss(env); |
657 |
masse |
1.24 |
|
658 |
teddy |
1.28 |
/* Find the end of the list */ |
659 |
masse |
1.8 |
while(temp->next!=NULL) |
660 |
|
|
temp= temp->next; |
661 |
|
|
|
662 |
teddy |
1.28 |
/* Connect the tail of the list with the old stack head */ |
663 |
|
|
temp->next= env->head; |
664 |
|
|
env->head= new_head; /* ...and voila! */ |
665 |
|
|
|
666 |
teddy |
1.5 |
} |
667 |
masse |
1.11 |
|
668 |
masse |
1.14 |
/* Compares two elements by reference. */ |
669 |
teddy |
1.28 |
extern void eq(environment *env) |
670 |
masse |
1.11 |
{ |
671 |
|
|
void *left, *right; |
672 |
|
|
int result; |
673 |
|
|
|
674 |
teddy |
1.28 |
if((env->head)==NULL || env->head->next==NULL) { |
675 |
teddy |
1.36 |
printerr("Too Few Arguments"); |
676 |
teddy |
1.35 |
env->err=1; |
677 |
masse |
1.11 |
return; |
678 |
masse |
1.17 |
} |
679 |
masse |
1.11 |
|
680 |
teddy |
1.28 |
left= env->head->item->content.ptr; |
681 |
|
|
swap(env); |
682 |
|
|
right= env->head->item->content.ptr; |
683 |
masse |
1.11 |
result= (left==right); |
684 |
|
|
|
685 |
teddy |
1.28 |
toss(env); toss(env); |
686 |
masse |
1.72 |
push_int(env, result); |
687 |
masse |
1.11 |
} |
688 |
|
|
|
689 |
masse |
1.14 |
/* Negates the top element on the stack. */ |
690 |
teddy |
1.28 |
extern void not(environment *env) |
691 |
masse |
1.11 |
{ |
692 |
teddy |
1.28 |
int val; |
693 |
masse |
1.11 |
|
694 |
teddy |
1.36 |
if((env->head)==NULL) { |
695 |
|
|
printerr("Too Few Arguments"); |
696 |
teddy |
1.35 |
env->err=1; |
697 |
masse |
1.11 |
return; |
698 |
masse |
1.17 |
} |
699 |
masse |
1.11 |
|
700 |
teddy |
1.36 |
if(env->head->item->type!=integer) { |
701 |
|
|
printerr("Bad Argument Type"); |
702 |
|
|
env->err=2; |
703 |
|
|
return; |
704 |
|
|
} |
705 |
|
|
|
706 |
teddy |
1.28 |
val= env->head->item->content.val; |
707 |
|
|
toss(env); |
708 |
masse |
1.72 |
push_int(env, !val); |
709 |
masse |
1.11 |
} |
710 |
|
|
|
711 |
masse |
1.14 |
/* Compares the two top elements on the stack and return 0 if they're the |
712 |
|
|
same. */ |
713 |
teddy |
1.28 |
extern void neq(environment *env) |
714 |
masse |
1.11 |
{ |
715 |
teddy |
1.28 |
eq(env); |
716 |
|
|
not(env); |
717 |
masse |
1.11 |
} |
718 |
masse |
1.12 |
|
719 |
masse |
1.14 |
/* Give a symbol some content. */ |
720 |
teddy |
1.28 |
extern void def(environment *env) |
721 |
masse |
1.12 |
{ |
722 |
teddy |
1.28 |
symbol *sym; |
723 |
masse |
1.12 |
|
724 |
teddy |
1.28 |
/* Needs two values on the stack, the top one must be a symbol */ |
725 |
teddy |
1.36 |
if(env->head==NULL || env->head->next==NULL) { |
726 |
|
|
printerr("Too Few Arguments"); |
727 |
teddy |
1.35 |
env->err=1; |
728 |
masse |
1.12 |
return; |
729 |
masse |
1.17 |
} |
730 |
masse |
1.12 |
|
731 |
teddy |
1.36 |
if(env->head->item->type!=symb) { |
732 |
|
|
printerr("Bad Argument Type"); |
733 |
|
|
env->err=2; |
734 |
|
|
return; |
735 |
|
|
} |
736 |
|
|
|
737 |
teddy |
1.28 |
/* long names are a pain */ |
738 |
|
|
sym=env->head->item->content.ptr; |
739 |
|
|
|
740 |
|
|
/* if the symbol was bound to something else, throw it away */ |
741 |
|
|
if(sym->val != NULL) |
742 |
|
|
free_val(sym->val); |
743 |
|
|
|
744 |
|
|
/* Bind the symbol to the value */ |
745 |
|
|
sym->val= env->head->next->item; |
746 |
|
|
sym->val->refcount++; /* Increase the reference counter */ |
747 |
masse |
1.12 |
|
748 |
teddy |
1.28 |
toss(env); toss(env); |
749 |
masse |
1.12 |
} |
750 |
masse |
1.10 |
|
751 |
teddy |
1.77 |
extern void clear(environment *); |
752 |
|
|
void forget_sym(symbol **); |
753 |
masse |
1.83 |
extern void words(environment *); |
754 |
teddy |
1.77 |
|
755 |
masse |
1.14 |
/* Quit stack. */ |
756 |
teddy |
1.28 |
extern void quit(environment *env) |
757 |
teddy |
1.5 |
{ |
758 |
teddy |
1.77 |
long i; |
759 |
|
|
|
760 |
|
|
clear(env); |
761 |
masse |
1.83 |
|
762 |
teddy |
1.77 |
if (env->err) return; |
763 |
|
|
for(i= 0; i<HASHTBLSIZE; i++) { |
764 |
masse |
1.79 |
while(env->symbols[i]!= NULL) { |
765 |
teddy |
1.77 |
forget_sym(&(env->symbols[i])); |
766 |
|
|
} |
767 |
teddy |
1.80 |
env->symbols[i]= NULL; |
768 |
teddy |
1.77 |
} |
769 |
masse |
1.83 |
|
770 |
|
|
if(env->free_string!=NULL) |
771 |
|
|
free(env->free_string); |
772 |
|
|
|
773 |
|
|
muntrace(); |
774 |
|
|
|
775 |
teddy |
1.5 |
exit(EXIT_SUCCESS); |
776 |
masse |
1.24 |
} |
777 |
|
|
|
778 |
|
|
/* Clear stack */ |
779 |
teddy |
1.28 |
extern void clear(environment *env) |
780 |
masse |
1.24 |
{ |
781 |
teddy |
1.28 |
while(env->head!=NULL) |
782 |
|
|
toss(env); |
783 |
masse |
1.1 |
} |
784 |
|
|
|
785 |
teddy |
1.33 |
/* List all defined words */ |
786 |
masse |
1.32 |
extern void words(environment *env) |
787 |
|
|
{ |
788 |
|
|
symbol *temp; |
789 |
|
|
int i; |
790 |
|
|
|
791 |
|
|
for(i= 0; i<HASHTBLSIZE; i++) { |
792 |
|
|
temp= env->symbols[i]; |
793 |
|
|
while(temp!=NULL) { |
794 |
|
|
printf("%s\n", temp->id); |
795 |
|
|
temp= temp->next; |
796 |
|
|
} |
797 |
|
|
} |
798 |
|
|
} |
799 |
masse |
1.34 |
|
800 |
teddy |
1.77 |
/* Internal forget function */ |
801 |
|
|
void forget_sym(symbol **hash_entry) { |
802 |
|
|
symbol *temp; |
803 |
|
|
|
804 |
|
|
temp= *hash_entry; |
805 |
|
|
*hash_entry= (*hash_entry)->next; |
806 |
|
|
|
807 |
|
|
if(temp->val!=NULL) { |
808 |
|
|
free_val(temp->val); |
809 |
|
|
} |
810 |
|
|
free(temp->id); |
811 |
|
|
free(temp); |
812 |
|
|
} |
813 |
|
|
|
814 |
masse |
1.34 |
/* Forgets a symbol (remove it from the hash table) */ |
815 |
|
|
extern void forget(environment *env) |
816 |
|
|
{ |
817 |
|
|
char* sym_id; |
818 |
|
|
stackitem *stack_head= env->head; |
819 |
|
|
|
820 |
teddy |
1.36 |
if(stack_head==NULL) { |
821 |
|
|
printerr("Too Few Arguments"); |
822 |
|
|
env->err=1; |
823 |
|
|
return; |
824 |
|
|
} |
825 |
|
|
|
826 |
|
|
if(stack_head->item->type!=symb) { |
827 |
|
|
printerr("Bad Argument Type"); |
828 |
|
|
env->err=2; |
829 |
masse |
1.34 |
return; |
830 |
|
|
} |
831 |
|
|
|
832 |
|
|
sym_id= ((symbol*)(stack_head->item->content.ptr))->id; |
833 |
|
|
toss(env); |
834 |
|
|
|
835 |
teddy |
1.77 |
return forget_sym(hash(env->symbols, sym_id)); |
836 |
teddy |
1.36 |
} |
837 |
|
|
|
838 |
|
|
/* Returns the current error number to the stack */ |
839 |
|
|
extern void errn(environment *env){ |
840 |
masse |
1.72 |
push_int(env, env->err); |
841 |
teddy |
1.36 |
} |
842 |
masse |
1.32 |
|
843 |
teddy |
1.84 |
extern void sx_72656164(environment*); |
844 |
masse |
1.69 |
|
845 |
teddy |
1.84 |
int main(int argc, char **argv) |
846 |
masse |
1.1 |
{ |
847 |
teddy |
1.28 |
environment myenv; |
848 |
masse |
1.1 |
|
849 |
teddy |
1.84 |
int c; /* getopt option character */ |
850 |
|
|
|
851 |
masse |
1.83 |
mtrace(); |
852 |
|
|
|
853 |
teddy |
1.28 |
init_env(&myenv); |
854 |
masse |
1.1 |
|
855 |
teddy |
1.84 |
myenv.interactive = isatty(STDIN_FILENO) && isatty(STDOUT_FILENO); |
856 |
|
|
|
857 |
|
|
while ((c = getopt (argc, argv, "i")) != -1) |
858 |
|
|
switch (c) |
859 |
|
|
{ |
860 |
|
|
case 'i': |
861 |
|
|
myenv.interactive = 1; |
862 |
|
|
break; |
863 |
|
|
case '?': |
864 |
|
|
fprintf (stderr, |
865 |
|
|
"Unknown option character `\\x%x'.\n", |
866 |
|
|
optopt); |
867 |
|
|
return EX_USAGE; |
868 |
|
|
default: |
869 |
|
|
abort (); |
870 |
|
|
} |
871 |
|
|
|
872 |
|
|
if (optind < argc) { |
873 |
|
|
myenv.interactive = 0; |
874 |
|
|
myenv.inputstream= fopen(argv[optind], "r"); |
875 |
|
|
if(myenv.inputstream== NULL) { |
876 |
|
|
perror(argv[0]); |
877 |
|
|
exit (EX_NOINPUT); |
878 |
|
|
} |
879 |
|
|
} |
880 |
|
|
|
881 |
masse |
1.69 |
while(1) { |
882 |
teddy |
1.85 |
if(myenv.in_string==NULL) { |
883 |
|
|
if (myenv.interactive) { |
884 |
|
|
if(myenv.err) { |
885 |
|
|
printf("(error %d)\n", myenv.err); |
886 |
|
|
} |
887 |
|
|
nl(); |
888 |
|
|
printstack(&myenv); |
889 |
|
|
printf("> "); |
890 |
|
|
} |
891 |
|
|
myenv.err=0; |
892 |
teddy |
1.80 |
} |
893 |
teddy |
1.84 |
sx_72656164(&myenv); |
894 |
teddy |
1.85 |
if (myenv.err==4) { |
895 |
|
|
return EX_NOINPUT; |
896 |
masse |
1.71 |
} else if(myenv.head!=NULL |
897 |
|
|
&& myenv.head->item->type==symb |
898 |
masse |
1.69 |
&& ((symbol*)(myenv.head->item->content.ptr))->id[0]==';') { |
899 |
|
|
toss(&myenv); /* No error check in main */ |
900 |
|
|
eval(&myenv); |
901 |
teddy |
1.35 |
} |
902 |
masse |
1.1 |
} |
903 |
teddy |
1.41 |
quit(&myenv); |
904 |
teddy |
1.42 |
return EXIT_FAILURE; |
905 |
teddy |
1.48 |
} |
906 |
|
|
|
907 |
teddy |
1.85 |
/* "+" */ |
908 |
teddy |
1.48 |
extern void sx_2b(environment *env) { |
909 |
|
|
int a, b; |
910 |
masse |
1.49 |
size_t len; |
911 |
|
|
char* new_string; |
912 |
|
|
value *a_val, *b_val; |
913 |
teddy |
1.48 |
|
914 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
915 |
|
|
printerr("Too Few Arguments"); |
916 |
|
|
env->err=1; |
917 |
masse |
1.49 |
return; |
918 |
|
|
} |
919 |
|
|
|
920 |
|
|
if(env->head->item->type==string |
921 |
|
|
&& env->head->next->item->type==string) { |
922 |
|
|
a_val= env->head->item; |
923 |
|
|
b_val= env->head->next->item; |
924 |
|
|
a_val->refcount++; |
925 |
|
|
b_val->refcount++; |
926 |
|
|
toss(env); if(env->err) return; |
927 |
|
|
toss(env); if(env->err) return; |
928 |
|
|
len= strlen(a_val->content.ptr)+strlen(b_val->content.ptr)+1; |
929 |
|
|
new_string= malloc(len); |
930 |
|
|
strcpy(new_string, b_val->content.ptr); |
931 |
|
|
strcat(new_string, a_val->content.ptr); |
932 |
|
|
free_val(a_val); free_val(b_val); |
933 |
masse |
1.72 |
push_cstring(env, new_string); |
934 |
masse |
1.49 |
free(new_string); |
935 |
teddy |
1.48 |
return; |
936 |
|
|
} |
937 |
|
|
|
938 |
|
|
if(env->head->item->type!=integer |
939 |
|
|
|| env->head->next->item->type!=integer) { |
940 |
|
|
printerr("Bad Argument Type"); |
941 |
|
|
env->err=2; |
942 |
|
|
return; |
943 |
|
|
} |
944 |
|
|
a=env->head->item->content.val; |
945 |
|
|
toss(env); |
946 |
|
|
if(env->err) return; |
947 |
teddy |
1.62 |
if(env->head->item->refcount == 1) |
948 |
|
|
env->head->item->content.val += a; |
949 |
|
|
else { |
950 |
|
|
b=env->head->item->content.val; |
951 |
|
|
toss(env); |
952 |
|
|
if(env->err) return; |
953 |
masse |
1.72 |
push_int(env, a+b); |
954 |
teddy |
1.62 |
} |
955 |
masse |
1.1 |
} |
956 |
teddy |
1.55 |
|
957 |
teddy |
1.85 |
/* "-" */ |
958 |
teddy |
1.60 |
extern void sx_2d(environment *env) { |
959 |
teddy |
1.62 |
int a, b; |
960 |
teddy |
1.60 |
|
961 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
962 |
|
|
printerr("Too Few Arguments"); |
963 |
|
|
env->err=1; |
964 |
|
|
return; |
965 |
|
|
} |
966 |
|
|
|
967 |
|
|
if(env->head->item->type!=integer |
968 |
|
|
|| env->head->next->item->type!=integer) { |
969 |
|
|
printerr("Bad Argument Type"); |
970 |
|
|
env->err=2; |
971 |
|
|
return; |
972 |
|
|
} |
973 |
|
|
a=env->head->item->content.val; |
974 |
|
|
toss(env); |
975 |
|
|
if(env->err) return; |
976 |
teddy |
1.62 |
if(env->head->item->refcount == 1) |
977 |
|
|
env->head->item->content.val -= a; |
978 |
|
|
else { |
979 |
|
|
b=env->head->item->content.val; |
980 |
|
|
toss(env); |
981 |
|
|
if(env->err) return; |
982 |
masse |
1.72 |
push_int(env, b-a); |
983 |
teddy |
1.62 |
} |
984 |
teddy |
1.60 |
} |
985 |
|
|
|
986 |
teddy |
1.85 |
/* ">" */ |
987 |
teddy |
1.61 |
extern void sx_3e(environment *env) { |
988 |
teddy |
1.62 |
int a, b; |
989 |
teddy |
1.61 |
|
990 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
991 |
|
|
printerr("Too Few Arguments"); |
992 |
|
|
env->err=1; |
993 |
|
|
return; |
994 |
|
|
} |
995 |
|
|
|
996 |
|
|
if(env->head->item->type!=integer |
997 |
|
|
|| env->head->next->item->type!=integer) { |
998 |
|
|
printerr("Bad Argument Type"); |
999 |
|
|
env->err=2; |
1000 |
|
|
return; |
1001 |
|
|
} |
1002 |
|
|
a=env->head->item->content.val; |
1003 |
|
|
toss(env); |
1004 |
|
|
if(env->err) return; |
1005 |
teddy |
1.62 |
if(env->head->item->refcount == 1) |
1006 |
|
|
env->head->item->content.val = (env->head->item->content.val > a); |
1007 |
|
|
else { |
1008 |
|
|
b=env->head->item->content.val; |
1009 |
|
|
toss(env); |
1010 |
|
|
if(env->err) return; |
1011 |
masse |
1.72 |
push_int(env, b>a); |
1012 |
teddy |
1.62 |
} |
1013 |
teddy |
1.61 |
} |
1014 |
|
|
|
1015 |
teddy |
1.55 |
/* Return copy of a value */ |
1016 |
|
|
value *copy_val(value *old_value){ |
1017 |
|
|
stackitem *old_item, *new_item, *prev_item; |
1018 |
|
|
|
1019 |
|
|
value *new_value=malloc(sizeof(value)); |
1020 |
|
|
|
1021 |
|
|
new_value->type=old_value->type; |
1022 |
|
|
new_value->refcount=0; /* This is increased if/when this |
1023 |
|
|
value is referenced somewhere, like |
1024 |
|
|
in a stack item or a variable */ |
1025 |
|
|
switch(old_value->type){ |
1026 |
|
|
case integer: |
1027 |
|
|
new_value->content.val=old_value->content.val; |
1028 |
|
|
break; |
1029 |
|
|
case string: |
1030 |
|
|
(char *)(new_value->content.ptr) |
1031 |
|
|
= strdup((char *)(old_value->content.ptr)); |
1032 |
|
|
break; |
1033 |
|
|
case func: |
1034 |
|
|
case symb: |
1035 |
|
|
new_value->content.ptr=old_value->content.ptr; |
1036 |
|
|
break; |
1037 |
|
|
case list: |
1038 |
|
|
new_value->content.ptr=NULL; |
1039 |
|
|
|
1040 |
|
|
prev_item=NULL; |
1041 |
|
|
old_item=(stackitem *)(old_value->content.ptr); |
1042 |
|
|
|
1043 |
|
|
while(old_item != NULL) { /* While list is not empty */ |
1044 |
|
|
new_item= malloc(sizeof(stackitem)); |
1045 |
|
|
new_item->item=copy_val(old_item->item); /* recurse */ |
1046 |
|
|
new_item->next=NULL; |
1047 |
|
|
if(prev_item != NULL) /* If this wasn't the first item */ |
1048 |
|
|
prev_item->next=new_item; /* point the previous item to the |
1049 |
|
|
new item */ |
1050 |
|
|
else |
1051 |
|
|
new_value->content.ptr=new_item; |
1052 |
|
|
old_item=old_item->next; |
1053 |
|
|
prev_item=new_item; |
1054 |
|
|
} |
1055 |
|
|
break; |
1056 |
|
|
} |
1057 |
|
|
return new_value; |
1058 |
|
|
} |
1059 |
|
|
|
1060 |
teddy |
1.84 |
/* "dup"; duplicates an item on the stack */ |
1061 |
|
|
extern void sx_647570(environment *env) { |
1062 |
teddy |
1.55 |
if((env->head)==NULL) { |
1063 |
|
|
printerr("Too Few Arguments"); |
1064 |
|
|
env->err=1; |
1065 |
|
|
return; |
1066 |
|
|
} |
1067 |
masse |
1.72 |
push_val(env, copy_val(env->head->item)); |
1068 |
teddy |
1.55 |
} |
1069 |
teddy |
1.56 |
|
1070 |
teddy |
1.59 |
/* "if", If-Then */ |
1071 |
masse |
1.57 |
extern void sx_6966(environment *env) { |
1072 |
teddy |
1.56 |
|
1073 |
|
|
int truth; |
1074 |
|
|
|
1075 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
1076 |
|
|
printerr("Too Few Arguments"); |
1077 |
|
|
env->err=1; |
1078 |
|
|
return; |
1079 |
|
|
} |
1080 |
|
|
|
1081 |
|
|
if(env->head->next->item->type != integer) { |
1082 |
|
|
printerr("Bad Argument Type"); |
1083 |
|
|
env->err=2; |
1084 |
|
|
return; |
1085 |
|
|
} |
1086 |
|
|
|
1087 |
|
|
swap(env); |
1088 |
|
|
if(env->err) return; |
1089 |
|
|
|
1090 |
|
|
truth=env->head->item->content.val; |
1091 |
|
|
|
1092 |
|
|
toss(env); |
1093 |
|
|
if(env->err) return; |
1094 |
|
|
|
1095 |
|
|
if(truth) |
1096 |
|
|
eval(env); |
1097 |
|
|
else |
1098 |
|
|
toss(env); |
1099 |
|
|
} |
1100 |
|
|
|
1101 |
|
|
/* If-Then-Else */ |
1102 |
masse |
1.57 |
extern void ifelse(environment *env) { |
1103 |
teddy |
1.56 |
|
1104 |
|
|
int truth; |
1105 |
|
|
|
1106 |
|
|
if((env->head)==NULL || env->head->next==NULL |
1107 |
|
|
|| env->head->next->next==NULL) { |
1108 |
|
|
printerr("Too Few Arguments"); |
1109 |
|
|
env->err=1; |
1110 |
|
|
return; |
1111 |
|
|
} |
1112 |
|
|
|
1113 |
|
|
if(env->head->next->next->item->type != integer) { |
1114 |
|
|
printerr("Bad Argument Type"); |
1115 |
|
|
env->err=2; |
1116 |
|
|
return; |
1117 |
|
|
} |
1118 |
|
|
|
1119 |
|
|
rot(env); |
1120 |
|
|
if(env->err) return; |
1121 |
|
|
|
1122 |
|
|
truth=env->head->item->content.val; |
1123 |
|
|
|
1124 |
|
|
toss(env); |
1125 |
|
|
if(env->err) return; |
1126 |
|
|
|
1127 |
|
|
if(!truth) |
1128 |
|
|
swap(env); |
1129 |
|
|
if(env->err) return; |
1130 |
|
|
|
1131 |
|
|
toss(env); |
1132 |
|
|
if(env->err) return; |
1133 |
|
|
|
1134 |
|
|
eval(env); |
1135 |
masse |
1.58 |
} |
1136 |
|
|
|
1137 |
teddy |
1.85 |
/* "while" */ |
1138 |
masse |
1.58 |
extern void sx_7768696c65(environment *env) { |
1139 |
|
|
|
1140 |
|
|
int truth; |
1141 |
masse |
1.63 |
value *loop, *test; |
1142 |
masse |
1.58 |
|
1143 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
1144 |
|
|
printerr("Too Few Arguments"); |
1145 |
|
|
env->err=1; |
1146 |
|
|
return; |
1147 |
|
|
} |
1148 |
|
|
|
1149 |
masse |
1.63 |
loop= env->head->item; |
1150 |
|
|
loop->refcount++; |
1151 |
|
|
toss(env); if(env->err) return; |
1152 |
|
|
|
1153 |
|
|
test= env->head->item; |
1154 |
|
|
test->refcount++; |
1155 |
|
|
toss(env); if(env->err) return; |
1156 |
|
|
|
1157 |
masse |
1.58 |
do { |
1158 |
masse |
1.72 |
push_val(env, test); |
1159 |
masse |
1.63 |
eval(env); |
1160 |
masse |
1.58 |
|
1161 |
|
|
if(env->head->item->type != integer) { |
1162 |
|
|
printerr("Bad Argument Type"); |
1163 |
|
|
env->err=2; |
1164 |
|
|
return; |
1165 |
|
|
} |
1166 |
|
|
|
1167 |
|
|
truth= env->head->item->content.val; |
1168 |
|
|
toss(env); if(env->err) return; |
1169 |
|
|
|
1170 |
|
|
if(truth) { |
1171 |
masse |
1.72 |
push_val(env, loop); |
1172 |
masse |
1.58 |
eval(env); |
1173 |
|
|
} else { |
1174 |
|
|
toss(env); |
1175 |
|
|
} |
1176 |
|
|
|
1177 |
|
|
} while(truth); |
1178 |
masse |
1.63 |
|
1179 |
|
|
free_val(test); |
1180 |
|
|
free_val(loop); |
1181 |
teddy |
1.56 |
} |
1182 |
masse |
1.65 |
|
1183 |
teddy |
1.84 |
/* "for"; For-loop */ |
1184 |
masse |
1.65 |
extern void sx_666f72(environment *env) { |
1185 |
|
|
|
1186 |
|
|
value *loop, *foo; |
1187 |
|
|
stackitem *iterator; |
1188 |
|
|
|
1189 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
1190 |
|
|
printerr("Too Few Arguments"); |
1191 |
|
|
env->err=1; |
1192 |
|
|
return; |
1193 |
|
|
} |
1194 |
|
|
|
1195 |
|
|
if(env->head->next->item->type != list) { |
1196 |
|
|
printerr("Bad Argument Type"); |
1197 |
|
|
env->err=2; |
1198 |
|
|
return; |
1199 |
|
|
} |
1200 |
|
|
|
1201 |
|
|
loop= env->head->item; |
1202 |
|
|
loop->refcount++; |
1203 |
|
|
toss(env); if(env->err) return; |
1204 |
|
|
|
1205 |
|
|
foo= env->head->item; |
1206 |
|
|
foo->refcount++; |
1207 |
|
|
toss(env); if(env->err) return; |
1208 |
|
|
|
1209 |
|
|
iterator= foo->content.ptr; |
1210 |
|
|
|
1211 |
|
|
while(iterator!=NULL) { |
1212 |
masse |
1.72 |
push_val(env, iterator->item); |
1213 |
|
|
push_val(env, loop); |
1214 |
masse |
1.65 |
eval(env); if(env->err) return; |
1215 |
|
|
iterator= iterator->next; |
1216 |
|
|
} |
1217 |
|
|
|
1218 |
|
|
free_val(loop); |
1219 |
|
|
free_val(foo); |
1220 |
|
|
} |
1221 |
masse |
1.66 |
|
1222 |
teddy |
1.85 |
/* "to" */ |
1223 |
masse |
1.66 |
extern void to(environment *env) { |
1224 |
|
|
int i, start, ending; |
1225 |
masse |
1.74 |
stackitem *temp_head; |
1226 |
|
|
value *temp_val; |
1227 |
masse |
1.66 |
|
1228 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
1229 |
|
|
printerr("Too Few Arguments"); |
1230 |
|
|
env->err=1; |
1231 |
|
|
return; |
1232 |
|
|
} |
1233 |
|
|
|
1234 |
|
|
if(env->head->item->type!=integer |
1235 |
|
|
|| env->head->next->item->type!=integer) { |
1236 |
|
|
printerr("Bad Argument Type"); |
1237 |
|
|
env->err=2; |
1238 |
|
|
return; |
1239 |
|
|
} |
1240 |
|
|
|
1241 |
|
|
ending= env->head->item->content.val; |
1242 |
|
|
toss(env); if(env->err) return; |
1243 |
|
|
start= env->head->item->content.val; |
1244 |
|
|
toss(env); if(env->err) return; |
1245 |
|
|
|
1246 |
masse |
1.74 |
temp_head= env->head; |
1247 |
|
|
env->head= NULL; |
1248 |
masse |
1.66 |
|
1249 |
masse |
1.67 |
if(ending>=start) { |
1250 |
masse |
1.74 |
for(i= ending; i>=start; i--) |
1251 |
masse |
1.72 |
push_int(env, i); |
1252 |
masse |
1.67 |
} else { |
1253 |
masse |
1.74 |
for(i= ending; i<=start; i++) |
1254 |
masse |
1.72 |
push_int(env, i); |
1255 |
masse |
1.67 |
} |
1256 |
masse |
1.66 |
|
1257 |
masse |
1.74 |
temp_val= malloc(sizeof(value)); |
1258 |
|
|
temp_val->content.ptr= env->head; |
1259 |
masse |
1.83 |
temp_val->refcount= 0; |
1260 |
masse |
1.74 |
temp_val->type= list; |
1261 |
|
|
env->head= temp_head; |
1262 |
|
|
push_val(env, temp_val); |
1263 |
masse |
1.66 |
} |
1264 |
masse |
1.68 |
|
1265 |
|
|
/* Read a string */ |
1266 |
|
|
extern void readline(environment *env) { |
1267 |
|
|
char in_string[101]; |
1268 |
|
|
|
1269 |
teddy |
1.84 |
if(fgets(in_string, 100, env->inputstream)==NULL) |
1270 |
|
|
push_cstring(env, ""); |
1271 |
|
|
else |
1272 |
|
|
push_cstring(env, in_string); |
1273 |
masse |
1.68 |
} |
1274 |
|
|
|
1275 |
teddy |
1.84 |
/* "read"; Read a value and place on stack */ |
1276 |
|
|
extern void sx_72656164(environment *env) { |
1277 |
teddy |
1.78 |
const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%n"; |
1278 |
|
|
const char strform[]= "\"%[^\"]\"%n"; |
1279 |
|
|
const char intform[]= "%i%n"; |
1280 |
|
|
const char blankform[]= "%*[ \t]%n"; |
1281 |
|
|
const char ebrackform[]= "%*1[]]%n"; |
1282 |
|
|
const char semicform[]= "%*1[;]%n"; |
1283 |
|
|
const char bbrackform[]= "%*1[[]%n"; |
1284 |
masse |
1.68 |
|
1285 |
teddy |
1.78 |
int itemp, readlength= -1; |
1286 |
masse |
1.68 |
static int depth= 0; |
1287 |
masse |
1.83 |
char *match; |
1288 |
masse |
1.68 |
size_t inlength; |
1289 |
|
|
|
1290 |
masse |
1.70 |
if(env->in_string==NULL) { |
1291 |
teddy |
1.84 |
if(depth > 0 && env->interactive) { |
1292 |
teddy |
1.80 |
printf("]> "); |
1293 |
|
|
} |
1294 |
masse |
1.68 |
readline(env); if(env->err) return; |
1295 |
teddy |
1.84 |
|
1296 |
|
|
if(((char *)(env->head->item->content.ptr))[0]=='\0'){ |
1297 |
teddy |
1.85 |
env->err= 4; /* "" means EOF */ |
1298 |
teddy |
1.84 |
return; |
1299 |
|
|
} |
1300 |
masse |
1.68 |
|
1301 |
masse |
1.70 |
env->in_string= malloc(strlen(env->head->item->content.ptr)+1); |
1302 |
teddy |
1.78 |
env->free_string= env->in_string; /* Save the original pointer */ |
1303 |
masse |
1.70 |
strcpy(env->in_string, env->head->item->content.ptr); |
1304 |
masse |
1.68 |
toss(env); if(env->err) return; |
1305 |
|
|
} |
1306 |
|
|
|
1307 |
masse |
1.70 |
inlength= strlen(env->in_string)+1; |
1308 |
masse |
1.68 |
match= malloc(inlength); |
1309 |
|
|
|
1310 |
teddy |
1.78 |
if(sscanf(env->in_string, blankform, &readlength)!=EOF |
1311 |
|
|
&& readlength != -1) { |
1312 |
masse |
1.71 |
; |
1313 |
teddy |
1.78 |
} else if(sscanf(env->in_string, intform, &itemp, &readlength) != EOF |
1314 |
|
|
&& readlength != -1) { |
1315 |
masse |
1.72 |
push_int(env, itemp); |
1316 |
teddy |
1.78 |
} else if(sscanf(env->in_string, strform, match, &readlength) != EOF |
1317 |
|
|
&& readlength != -1) { |
1318 |
masse |
1.72 |
push_cstring(env, match); |
1319 |
teddy |
1.78 |
} else if(sscanf(env->in_string, symbform, match, &readlength) != EOF |
1320 |
|
|
&& readlength != -1) { |
1321 |
masse |
1.68 |
push_sym(env, match); |
1322 |
teddy |
1.78 |
} else if(sscanf(env->in_string, ebrackform, &readlength) != EOF |
1323 |
|
|
&& readlength != -1) { |
1324 |
masse |
1.68 |
pack(env); if(env->err) return; |
1325 |
teddy |
1.78 |
if(depth != 0) depth--; |
1326 |
|
|
} else if(sscanf(env->in_string, semicform, &readlength) != EOF |
1327 |
|
|
&& readlength != -1) { |
1328 |
masse |
1.68 |
push_sym(env, ";"); |
1329 |
teddy |
1.78 |
} else if(sscanf(env->in_string, bbrackform, &readlength) != EOF |
1330 |
|
|
&& readlength != -1) { |
1331 |
masse |
1.68 |
push_sym(env, "["); |
1332 |
|
|
depth++; |
1333 |
|
|
} else { |
1334 |
teddy |
1.78 |
free(env->free_string); |
1335 |
|
|
env->in_string = env->free_string = NULL; |
1336 |
|
|
} |
1337 |
|
|
if ( env->in_string != NULL) { |
1338 |
|
|
env->in_string += readlength; |
1339 |
masse |
1.68 |
} |
1340 |
masse |
1.83 |
|
1341 |
|
|
free(match); |
1342 |
masse |
1.68 |
|
1343 |
masse |
1.71 |
if(depth) |
1344 |
teddy |
1.84 |
return sx_72656164(env); |
1345 |
masse |
1.68 |
} |