1 |
teddy |
1.52 |
/* printf, sscanf, fgets, fprintf */ |
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 |
masse |
1.1 |
|
12 |
masse |
1.72 |
#define HASHTBLSIZE 2048 |
13 |
masse |
1.1 |
|
14 |
teddy |
1.28 |
/* First, define some types. */ |
15 |
|
|
|
16 |
|
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/* A value of some type */ |
17 |
|
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typedef struct { |
18 |
masse |
1.16 |
enum { |
19 |
teddy |
1.28 |
integer, |
20 |
teddy |
1.18 |
string, |
21 |
masse |
1.16 |
func, /* Function pointer */ |
22 |
teddy |
1.28 |
symb, |
23 |
masse |
1.16 |
list |
24 |
teddy |
1.18 |
} type; /* Type of stack element */ |
25 |
|
|
|
26 |
masse |
1.1 |
union { |
27 |
teddy |
1.28 |
void *ptr; /* Pointer to the content */ |
28 |
masse |
1.16 |
int val; /* ...or an integer */ |
29 |
|
|
} content; /* Stores a pointer or an integer */ |
30 |
masse |
1.1 |
|
31 |
teddy |
1.28 |
int refcount; /* Reference counter */ |
32 |
|
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|
33 |
|
|
} value; |
34 |
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|
35 |
|
|
/* A symbol with a name and possible value */ |
36 |
|
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/* (These do not need reference counters, they are kept unique by |
37 |
|
|
hashing.) */ |
38 |
|
|
typedef struct symbol_struct { |
39 |
|
|
char *id; /* Symbol name */ |
40 |
|
|
value *val; /* The value (if any) bound to it */ |
41 |
|
|
struct symbol_struct *next; /* In case of hashing conflicts, a */ |
42 |
|
|
} symbol; /* symbol is a kind of stack item. */ |
43 |
|
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|
44 |
|
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/* A type for a hash table for symbols */ |
45 |
|
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typedef symbol *hashtbl[HASHTBLSIZE]; /* Hash table declaration */ |
46 |
|
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|
47 |
|
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/* An item (value) on a stack */ |
48 |
|
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typedef struct stackitem_struct |
49 |
|
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{ |
50 |
|
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value *item; /* The value on the stack */ |
51 |
teddy |
1.56 |
/* (This is never NULL) */ |
52 |
teddy |
1.28 |
struct stackitem_struct *next; /* Next item */ |
53 |
masse |
1.1 |
} stackitem; |
54 |
|
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|
55 |
teddy |
1.28 |
/* An environment; gives access to the stack and a hash table of |
56 |
|
|
defined symbols */ |
57 |
|
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typedef struct { |
58 |
|
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stackitem *head; /* Head of the stack */ |
59 |
|
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hashtbl symbols; /* Hash table of all variable bindings */ |
60 |
teddy |
1.33 |
int err; /* Error flag */ |
61 |
masse |
1.46 |
int non_eval_flag; |
62 |
masse |
1.70 |
char *in_string; /* Input pending to be read */ |
63 |
teddy |
1.28 |
} environment; |
64 |
|
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|
65 |
|
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/* A type for pointers to external functions */ |
66 |
|
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typedef void (*funcp)(environment *); /* funcp is a pointer to a void |
67 |
|
|
function (environment *) */ |
68 |
masse |
1.1 |
|
69 |
teddy |
1.28 |
/* Initialize a newly created environment */ |
70 |
|
|
void init_env(environment *env) |
71 |
masse |
1.1 |
{ |
72 |
masse |
1.46 |
int i; |
73 |
masse |
1.1 |
|
74 |
masse |
1.70 |
env->in_string= NULL; |
75 |
masse |
1.46 |
env->err= 0; |
76 |
|
|
env->non_eval_flag= 0; |
77 |
masse |
1.1 |
for(i= 0; i<HASHTBLSIZE; i++) |
78 |
teddy |
1.28 |
env->symbols[i]= NULL; |
79 |
masse |
1.1 |
} |
80 |
|
|
|
81 |
teddy |
1.48 |
void printerr(const char* in_string) { |
82 |
|
|
fprintf(stderr, "Err: %s\n", in_string); |
83 |
|
|
} |
84 |
|
|
|
85 |
|
|
/* Throw away a value */ |
86 |
|
|
void free_val(value *val){ |
87 |
|
|
stackitem *item, *temp; |
88 |
|
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|
89 |
|
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val->refcount--; /* Decrease the reference count */ |
90 |
|
|
if(val->refcount == 0){ |
91 |
|
|
switch (val->type){ /* and free the contents if necessary */ |
92 |
|
|
case string: |
93 |
|
|
free(val->content.ptr); |
94 |
|
|
break; |
95 |
|
|
case list: /* lists needs to be freed recursively */ |
96 |
|
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item=val->content.ptr; |
97 |
|
|
while(item != NULL) { /* for all stack items */ |
98 |
|
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free_val(item->item); /* free the value */ |
99 |
|
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temp=item->next; /* save next ptr */ |
100 |
|
|
free(item); /* free the stackitem */ |
101 |
|
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item=temp; /* go to next stackitem */ |
102 |
|
|
} |
103 |
|
|
free(val); /* Free the actual list value */ |
104 |
|
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break; |
105 |
teddy |
1.54 |
case integer: |
106 |
|
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case func: |
107 |
|
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case symb: |
108 |
teddy |
1.48 |
break; |
109 |
|
|
} |
110 |
|
|
} |
111 |
|
|
} |
112 |
|
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|
113 |
|
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/* Discard the top element of the stack. */ |
114 |
|
|
extern void toss(environment *env) |
115 |
|
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{ |
116 |
|
|
stackitem *temp= env->head; |
117 |
|
|
|
118 |
|
|
if((env->head)==NULL) { |
119 |
|
|
printerr("Too Few Arguments"); |
120 |
|
|
env->err=1; |
121 |
|
|
return; |
122 |
|
|
} |
123 |
|
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|
124 |
|
|
free_val(env->head->item); /* Free the value */ |
125 |
|
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env->head= env->head->next; /* Remove the top stack item */ |
126 |
|
|
free(temp); /* Free the old top stack item */ |
127 |
|
|
} |
128 |
|
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|
129 |
teddy |
1.27 |
/* Returns a pointer to a pointer to an element in the hash table. */ |
130 |
teddy |
1.28 |
symbol **hash(hashtbl in_hashtbl, const char *in_string) |
131 |
masse |
1.1 |
{ |
132 |
masse |
1.46 |
int i= 0; |
133 |
|
|
unsigned int out_hash= 0; |
134 |
teddy |
1.18 |
char key= '\0'; |
135 |
teddy |
1.28 |
symbol **position; |
136 |
masse |
1.1 |
|
137 |
masse |
1.16 |
while(1){ /* Hash in_string */ |
138 |
masse |
1.1 |
key= in_string[i++]; |
139 |
|
|
if(key=='\0') |
140 |
|
|
break; |
141 |
|
|
out_hash= out_hash*32+key; |
142 |
|
|
} |
143 |
|
|
|
144 |
|
|
out_hash= out_hash%HASHTBLSIZE; |
145 |
|
|
position= &(in_hashtbl[out_hash]); |
146 |
|
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|
147 |
masse |
1.25 |
while(1){ |
148 |
teddy |
1.18 |
if(*position==NULL) /* If empty */ |
149 |
masse |
1.1 |
return position; |
150 |
|
|
|
151 |
teddy |
1.18 |
if(strcmp(in_string, (*position)->id)==0) /* If match */ |
152 |
masse |
1.1 |
return position; |
153 |
|
|
|
154 |
masse |
1.16 |
position= &((*position)->next); /* Try next */ |
155 |
masse |
1.1 |
} |
156 |
|
|
} |
157 |
|
|
|
158 |
masse |
1.14 |
/* Generic push function. */ |
159 |
masse |
1.72 |
void push(environment *env, stackitem* in_item) |
160 |
masse |
1.1 |
{ |
161 |
masse |
1.72 |
in_item->next= env->head; |
162 |
|
|
env->head= in_item; |
163 |
masse |
1.1 |
} |
164 |
|
|
|
165 |
teddy |
1.29 |
/* Push a value onto the stack */ |
166 |
masse |
1.72 |
void push_val(environment *env, value *val) |
167 |
teddy |
1.29 |
{ |
168 |
|
|
stackitem *new_item= malloc(sizeof(stackitem)); |
169 |
|
|
new_item->item= val; |
170 |
|
|
val->refcount++; |
171 |
masse |
1.72 |
push(env, new_item); |
172 |
teddy |
1.29 |
} |
173 |
|
|
|
174 |
teddy |
1.28 |
/* Push an integer onto the stack. */ |
175 |
masse |
1.72 |
void push_int(environment *env, int in_val) |
176 |
masse |
1.1 |
{ |
177 |
teddy |
1.28 |
value *new_value= malloc(sizeof(value)); |
178 |
|
|
stackitem *new_item= malloc(sizeof(stackitem)); |
179 |
|
|
new_item->item= new_value; |
180 |
|
|
|
181 |
|
|
new_value->content.val= in_val; |
182 |
|
|
new_value->type= integer; |
183 |
|
|
new_value->refcount=1; |
184 |
masse |
1.1 |
|
185 |
masse |
1.72 |
push(env, new_item); |
186 |
masse |
1.1 |
} |
187 |
|
|
|
188 |
masse |
1.14 |
/* Copy a string onto the stack. */ |
189 |
masse |
1.72 |
void push_cstring(environment *env, const char *in_string) |
190 |
masse |
1.1 |
{ |
191 |
teddy |
1.28 |
value *new_value= malloc(sizeof(value)); |
192 |
|
|
stackitem *new_item= malloc(sizeof(stackitem)); |
193 |
|
|
new_item->item=new_value; |
194 |
|
|
|
195 |
|
|
new_value->content.ptr= malloc(strlen(in_string)+1); |
196 |
|
|
strcpy(new_value->content.ptr, in_string); |
197 |
|
|
new_value->type= string; |
198 |
|
|
new_value->refcount=1; |
199 |
masse |
1.1 |
|
200 |
masse |
1.72 |
push(env, new_item); |
201 |
masse |
1.1 |
} |
202 |
|
|
|
203 |
teddy |
1.48 |
/* Mangle a symbol name to a valid C identifier name */ |
204 |
teddy |
1.51 |
char *mangle_str(const char *old_string){ |
205 |
teddy |
1.48 |
char validchars[] |
206 |
|
|
="0123456789abcdef"; |
207 |
|
|
char *new_string, *current; |
208 |
|
|
|
209 |
teddy |
1.50 |
new_string=malloc((strlen(old_string)*2)+4); |
210 |
teddy |
1.48 |
strcpy(new_string, "sx_"); /* Stack eXternal */ |
211 |
|
|
current=new_string+3; |
212 |
|
|
while(old_string[0] != '\0'){ |
213 |
teddy |
1.53 |
current[0]=validchars[(unsigned char)(old_string[0])/16]; |
214 |
|
|
current[1]=validchars[(unsigned char)(old_string[0])%16]; |
215 |
teddy |
1.48 |
current+=2; |
216 |
|
|
old_string++; |
217 |
|
|
} |
218 |
|
|
current[0]='\0'; |
219 |
|
|
|
220 |
|
|
return new_string; /* The caller must free() it */ |
221 |
|
|
} |
222 |
|
|
|
223 |
|
|
extern void mangle(environment *env){ |
224 |
|
|
value *new_value; |
225 |
|
|
char *new_string; |
226 |
|
|
|
227 |
|
|
if((env->head)==NULL) { |
228 |
|
|
printerr("Too Few Arguments"); |
229 |
|
|
env->err=1; |
230 |
|
|
return; |
231 |
|
|
} |
232 |
|
|
|
233 |
|
|
if(env->head->item->type!=string) { |
234 |
|
|
printerr("Bad Argument Type"); |
235 |
|
|
env->err=2; |
236 |
|
|
return; |
237 |
|
|
} |
238 |
|
|
|
239 |
teddy |
1.51 |
new_string= mangle_str((const char *)(env->head->item->content.ptr)); |
240 |
teddy |
1.48 |
|
241 |
|
|
toss(env); |
242 |
|
|
if(env->err) return; |
243 |
|
|
|
244 |
|
|
new_value= malloc(sizeof(value)); |
245 |
|
|
new_value->content.ptr= new_string; |
246 |
|
|
new_value->type= string; |
247 |
|
|
new_value->refcount=1; |
248 |
|
|
|
249 |
masse |
1.72 |
push_val(env, new_value); |
250 |
teddy |
1.48 |
} |
251 |
|
|
|
252 |
teddy |
1.28 |
/* Push a symbol onto the stack. */ |
253 |
teddy |
1.35 |
void push_sym(environment *env, const char *in_string) |
254 |
masse |
1.1 |
{ |
255 |
teddy |
1.28 |
stackitem *new_item; /* The new stack item */ |
256 |
|
|
/* ...which will contain... */ |
257 |
|
|
value *new_value; /* A new symbol value */ |
258 |
|
|
/* ...which might point to... */ |
259 |
teddy |
1.29 |
symbol **new_symbol; /* (if needed) A new actual symbol */ |
260 |
teddy |
1.28 |
/* ...which, if possible, will be bound to... */ |
261 |
|
|
value *new_fvalue; /* (if needed) A new function value */ |
262 |
|
|
/* ...which will point to... */ |
263 |
|
|
void *funcptr; /* A function pointer */ |
264 |
|
|
|
265 |
|
|
static void *handle= NULL; /* Dynamic linker handle */ |
266 |
teddy |
1.48 |
const char *dlerr; /* Dynamic linker error */ |
267 |
|
|
char *mangled; /* Mangled function name */ |
268 |
teddy |
1.28 |
|
269 |
|
|
/* Create a new stack item containing a new value */ |
270 |
|
|
new_item= malloc(sizeof(stackitem)); |
271 |
|
|
new_value= malloc(sizeof(value)); |
272 |
|
|
new_item->item=new_value; |
273 |
|
|
|
274 |
|
|
/* The new value is a symbol */ |
275 |
|
|
new_value->type= symb; |
276 |
|
|
new_value->refcount= 1; |
277 |
|
|
|
278 |
|
|
/* Look up the symbol name in the hash table */ |
279 |
teddy |
1.29 |
new_symbol= hash(env->symbols, in_string); |
280 |
|
|
new_value->content.ptr= *new_symbol; |
281 |
teddy |
1.28 |
|
282 |
teddy |
1.30 |
if(*new_symbol==NULL) { /* If symbol was undefined */ |
283 |
teddy |
1.28 |
|
284 |
|
|
/* Create a new symbol */ |
285 |
teddy |
1.30 |
(*new_symbol)= malloc(sizeof(symbol)); |
286 |
teddy |
1.29 |
(*new_symbol)->val= NULL; /* undefined value */ |
287 |
|
|
(*new_symbol)->next= NULL; |
288 |
|
|
(*new_symbol)->id= malloc(strlen(in_string)+1); |
289 |
|
|
strcpy((*new_symbol)->id, in_string); |
290 |
masse |
1.1 |
|
291 |
teddy |
1.28 |
/* Intern the new symbol in the hash table */ |
292 |
teddy |
1.29 |
new_value->content.ptr= *new_symbol; |
293 |
masse |
1.1 |
|
294 |
teddy |
1.28 |
/* Try to load the symbol name as an external function, to see if |
295 |
|
|
we should bind the symbol to a new function pointer value */ |
296 |
masse |
1.16 |
if(handle==NULL) /* If no handle */ |
297 |
teddy |
1.28 |
handle= dlopen(NULL, RTLD_LAZY); |
298 |
masse |
1.6 |
|
299 |
teddy |
1.28 |
funcptr= dlsym(handle, in_string); /* Get function pointer */ |
300 |
teddy |
1.48 |
dlerr=dlerror(); |
301 |
|
|
if(dlerr != NULL) { /* If no function was found */ |
302 |
teddy |
1.51 |
mangled=mangle_str(in_string); |
303 |
teddy |
1.48 |
funcptr= dlsym(handle, mangled); /* try mangling it */ |
304 |
|
|
free(mangled); |
305 |
|
|
dlerr=dlerror(); |
306 |
|
|
} |
307 |
|
|
if(dlerr==NULL) { /* If a function was found */ |
308 |
teddy |
1.28 |
new_fvalue= malloc(sizeof(value)); /* Create a new value */ |
309 |
|
|
new_fvalue->type=func; /* The new value is a function pointer */ |
310 |
|
|
new_fvalue->content.ptr=funcptr; /* Store function pointer */ |
311 |
teddy |
1.29 |
(*new_symbol)->val= new_fvalue; /* Bind the symbol to the new |
312 |
|
|
function value */ |
313 |
teddy |
1.28 |
new_fvalue->refcount= 1; |
314 |
|
|
} |
315 |
masse |
1.1 |
} |
316 |
masse |
1.72 |
push(env, new_item); |
317 |
masse |
1.1 |
} |
318 |
|
|
|
319 |
masse |
1.14 |
/* Print newline. */ |
320 |
masse |
1.34 |
extern void nl() |
321 |
masse |
1.8 |
{ |
322 |
|
|
printf("\n"); |
323 |
|
|
} |
324 |
masse |
1.1 |
|
325 |
teddy |
1.37 |
/* Gets the type of a value */ |
326 |
|
|
extern void type(environment *env){ |
327 |
|
|
int typenum; |
328 |
|
|
|
329 |
|
|
if((env->head)==NULL) { |
330 |
|
|
printerr("Too Few Arguments"); |
331 |
|
|
env->err=1; |
332 |
|
|
return; |
333 |
|
|
} |
334 |
|
|
typenum=env->head->item->type; |
335 |
|
|
toss(env); |
336 |
|
|
switch(typenum){ |
337 |
|
|
case integer: |
338 |
|
|
push_sym(env, "integer"); |
339 |
|
|
break; |
340 |
|
|
case string: |
341 |
|
|
push_sym(env, "string"); |
342 |
|
|
break; |
343 |
|
|
case symb: |
344 |
|
|
push_sym(env, "symbol"); |
345 |
|
|
break; |
346 |
|
|
case func: |
347 |
|
|
push_sym(env, "function"); |
348 |
|
|
break; |
349 |
|
|
case list: |
350 |
|
|
push_sym(env, "list"); |
351 |
|
|
break; |
352 |
|
|
} |
353 |
|
|
} |
354 |
|
|
|
355 |
masse |
1.14 |
/* Prints the top element of the stack. */ |
356 |
teddy |
1.28 |
void print_h(stackitem *stack_head) |
357 |
masse |
1.8 |
{ |
358 |
teddy |
1.28 |
switch(stack_head->item->type) { |
359 |
|
|
case integer: |
360 |
|
|
printf("%d", stack_head->item->content.val); |
361 |
teddy |
1.2 |
break; |
362 |
|
|
case string: |
363 |
masse |
1.58 |
printf("%s", (char*)stack_head->item->content.ptr); |
364 |
teddy |
1.2 |
break; |
365 |
teddy |
1.28 |
case symb: |
366 |
teddy |
1.45 |
printf("%s", ((symbol *)(stack_head->item->content.ptr))->id); |
367 |
masse |
1.6 |
break; |
368 |
teddy |
1.35 |
case func: |
369 |
|
|
printf("#<function %p>", (funcp)(stack_head->item->content.ptr)); |
370 |
|
|
break; |
371 |
|
|
case list: |
372 |
teddy |
1.38 |
/* A list is just a stack, so make stack_head point to it */ |
373 |
|
|
stack_head=(stackitem *)(stack_head->item->content.ptr); |
374 |
|
|
printf("[ "); |
375 |
|
|
while(stack_head != NULL) { |
376 |
|
|
print_h(stack_head); |
377 |
|
|
printf(" "); |
378 |
|
|
stack_head=stack_head->next; |
379 |
|
|
} |
380 |
teddy |
1.39 |
printf("]"); |
381 |
teddy |
1.35 |
break; |
382 |
teddy |
1.2 |
} |
383 |
masse |
1.1 |
} |
384 |
|
|
|
385 |
teddy |
1.28 |
extern void print_(environment *env) { |
386 |
teddy |
1.35 |
if(env->head==NULL) { |
387 |
teddy |
1.36 |
printerr("Too Few Arguments"); |
388 |
teddy |
1.35 |
env->err=1; |
389 |
|
|
return; |
390 |
|
|
} |
391 |
teddy |
1.28 |
print_h(env->head); |
392 |
|
|
} |
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 |
masse |
1.14 |
/* Only to be called by function printstack. */ |
403 |
teddy |
1.28 |
void print_st(stackitem *stack_head, long counter) |
404 |
masse |
1.8 |
{ |
405 |
|
|
if(stack_head->next != NULL) |
406 |
|
|
print_st(stack_head->next, counter+1); |
407 |
|
|
printf("%ld: ", counter); |
408 |
teddy |
1.28 |
print_h(stack_head); |
409 |
masse |
1.8 |
nl(); |
410 |
|
|
} |
411 |
|
|
|
412 |
masse |
1.14 |
/* Prints the stack. */ |
413 |
teddy |
1.28 |
extern void printstack(environment *env) |
414 |
masse |
1.1 |
{ |
415 |
teddy |
1.35 |
if(env->head == NULL) { |
416 |
|
|
return; |
417 |
masse |
1.1 |
} |
418 |
teddy |
1.35 |
print_st(env->head, 1); |
419 |
|
|
nl(); |
420 |
masse |
1.1 |
} |
421 |
|
|
|
422 |
masse |
1.26 |
/* Swap the two top elements on the stack. */ |
423 |
teddy |
1.28 |
extern void swap(environment *env) |
424 |
masse |
1.26 |
{ |
425 |
teddy |
1.28 |
stackitem *temp= env->head; |
426 |
masse |
1.26 |
|
427 |
masse |
1.46 |
if(env->head==NULL || env->head->next==NULL) { |
428 |
teddy |
1.36 |
printerr("Too Few Arguments"); |
429 |
teddy |
1.35 |
env->err=1; |
430 |
masse |
1.26 |
return; |
431 |
teddy |
1.28 |
} |
432 |
masse |
1.26 |
|
433 |
teddy |
1.28 |
env->head= env->head->next; |
434 |
|
|
temp->next= env->head->next; |
435 |
|
|
env->head->next= temp; |
436 |
masse |
1.26 |
} |
437 |
|
|
|
438 |
teddy |
1.56 |
/* Rotate the first three elements on the stack. */ |
439 |
|
|
extern void rot(environment *env) |
440 |
|
|
{ |
441 |
|
|
stackitem *temp= env->head; |
442 |
|
|
|
443 |
|
|
if(env->head==NULL || env->head->next==NULL |
444 |
|
|
|| env->head->next->next==NULL) { |
445 |
|
|
printerr("Too Few Arguments"); |
446 |
|
|
env->err=1; |
447 |
|
|
return; |
448 |
|
|
} |
449 |
|
|
|
450 |
|
|
env->head= env->head->next->next; |
451 |
|
|
temp->next->next= env->head->next; |
452 |
|
|
env->head->next= temp; |
453 |
|
|
} |
454 |
|
|
|
455 |
teddy |
1.33 |
/* Recall a value from a symbol, if bound */ |
456 |
teddy |
1.31 |
extern void rcl(environment *env) |
457 |
|
|
{ |
458 |
|
|
value *val; |
459 |
|
|
|
460 |
|
|
if(env->head == NULL) { |
461 |
teddy |
1.36 |
printerr("Too Few Arguments"); |
462 |
teddy |
1.35 |
env->err=1; |
463 |
teddy |
1.31 |
return; |
464 |
|
|
} |
465 |
|
|
|
466 |
|
|
if(env->head->item->type!=symb) { |
467 |
teddy |
1.36 |
printerr("Bad Argument Type"); |
468 |
|
|
env->err=2; |
469 |
teddy |
1.31 |
return; |
470 |
|
|
} |
471 |
teddy |
1.35 |
|
472 |
teddy |
1.31 |
val=((symbol *)(env->head->item->content.ptr))->val; |
473 |
teddy |
1.33 |
if(val == NULL){ |
474 |
teddy |
1.36 |
printerr("Unbound Variable"); |
475 |
|
|
env->err=3; |
476 |
teddy |
1.33 |
return; |
477 |
|
|
} |
478 |
teddy |
1.31 |
toss(env); /* toss the symbol */ |
479 |
teddy |
1.35 |
if(env->err) return; |
480 |
masse |
1.72 |
push_val(env, val); /* Return its bound value */ |
481 |
teddy |
1.31 |
} |
482 |
masse |
1.26 |
|
483 |
teddy |
1.29 |
/* If the top element is a symbol, determine if it's bound to a |
484 |
|
|
function value, and if it is, toss the symbol and execute the |
485 |
|
|
function. */ |
486 |
teddy |
1.28 |
extern void eval(environment *env) |
487 |
masse |
1.1 |
{ |
488 |
|
|
funcp in_func; |
489 |
masse |
1.44 |
value* temp_val; |
490 |
|
|
stackitem* iterator; |
491 |
|
|
|
492 |
teddy |
1.29 |
if(env->head==NULL) { |
493 |
teddy |
1.36 |
printerr("Too Few Arguments"); |
494 |
teddy |
1.35 |
env->err=1; |
495 |
masse |
1.1 |
return; |
496 |
masse |
1.17 |
} |
497 |
masse |
1.1 |
|
498 |
teddy |
1.64 |
eval_start: |
499 |
|
|
|
500 |
masse |
1.46 |
switch(env->head->item->type) { |
501 |
|
|
/* if it's a symbol */ |
502 |
|
|
case symb: |
503 |
teddy |
1.35 |
rcl(env); /* get its contents */ |
504 |
|
|
if(env->err) return; |
505 |
|
|
if(env->head->item->type!=symb){ /* don't recurse symbols */ |
506 |
teddy |
1.64 |
goto eval_start; |
507 |
teddy |
1.29 |
} |
508 |
teddy |
1.59 |
return; |
509 |
masse |
1.22 |
|
510 |
masse |
1.46 |
/* If it's a lone function value, run it */ |
511 |
|
|
case func: |
512 |
teddy |
1.29 |
in_func= (funcp)(env->head->item->content.ptr); |
513 |
teddy |
1.28 |
toss(env); |
514 |
teddy |
1.35 |
if(env->err) return; |
515 |
teddy |
1.59 |
return (*in_func)(env); |
516 |
masse |
1.44 |
|
517 |
masse |
1.46 |
/* If it's a list */ |
518 |
|
|
case list: |
519 |
masse |
1.44 |
temp_val= env->head->item; |
520 |
|
|
env->head->item->refcount++; |
521 |
|
|
toss(env); |
522 |
|
|
if(env->err) return; |
523 |
|
|
iterator= (stackitem*)temp_val->content.ptr; |
524 |
teddy |
1.59 |
while(iterator!=NULL) { |
525 |
masse |
1.72 |
push_val(env, iterator->item); |
526 |
masse |
1.44 |
if(env->head->item->type==symb |
527 |
|
|
&& strcmp(";", ((symbol*)(env->head->item->content.ptr))->id)==0) { |
528 |
|
|
toss(env); |
529 |
|
|
if(env->err) return; |
530 |
teddy |
1.59 |
if(iterator->next == NULL){ |
531 |
|
|
free_val(temp_val); |
532 |
teddy |
1.64 |
goto eval_start; |
533 |
teddy |
1.59 |
} |
534 |
masse |
1.44 |
eval(env); |
535 |
masse |
1.46 |
if(env->err) return; |
536 |
masse |
1.44 |
} |
537 |
|
|
iterator= iterator->next; |
538 |
|
|
} |
539 |
|
|
free_val(temp_val); |
540 |
teddy |
1.59 |
return; |
541 |
masse |
1.46 |
|
542 |
masse |
1.71 |
default: |
543 |
teddy |
1.59 |
return; |
544 |
masse |
1.26 |
} |
545 |
masse |
1.1 |
} |
546 |
|
|
|
547 |
masse |
1.44 |
/* Reverse (flip) a list */ |
548 |
teddy |
1.40 |
extern void rev(environment *env){ |
549 |
|
|
stackitem *old_head, *new_head, *item; |
550 |
|
|
|
551 |
|
|
if((env->head)==NULL) { |
552 |
|
|
printerr("Too Few Arguments"); |
553 |
|
|
env->err=1; |
554 |
|
|
return; |
555 |
|
|
} |
556 |
|
|
|
557 |
|
|
if(env->head->item->type!=list) { |
558 |
|
|
printerr("Bad Argument Type"); |
559 |
|
|
env->err=2; |
560 |
|
|
return; |
561 |
|
|
} |
562 |
|
|
|
563 |
|
|
old_head=(stackitem *)(env->head->item->content.ptr); |
564 |
|
|
new_head=NULL; |
565 |
|
|
while(old_head != NULL){ |
566 |
|
|
item=old_head; |
567 |
|
|
old_head=old_head->next; |
568 |
|
|
item->next=new_head; |
569 |
|
|
new_head=item; |
570 |
|
|
} |
571 |
|
|
env->head->item->content.ptr=new_head; |
572 |
|
|
} |
573 |
|
|
|
574 |
masse |
1.19 |
/* Make a list. */ |
575 |
teddy |
1.28 |
extern void pack(environment *env) |
576 |
masse |
1.19 |
{ |
577 |
|
|
void* delimiter; |
578 |
teddy |
1.28 |
stackitem *iterator, *temp; |
579 |
|
|
value *pack; |
580 |
masse |
1.19 |
|
581 |
teddy |
1.28 |
delimiter= env->head->item->content.ptr; /* Get delimiter */ |
582 |
|
|
toss(env); |
583 |
masse |
1.19 |
|
584 |
teddy |
1.28 |
iterator= env->head; |
585 |
masse |
1.19 |
|
586 |
teddy |
1.28 |
if(iterator==NULL || iterator->item->content.ptr==delimiter) { |
587 |
masse |
1.24 |
temp= NULL; |
588 |
teddy |
1.28 |
toss(env); |
589 |
masse |
1.24 |
} else { |
590 |
|
|
/* Search for first delimiter */ |
591 |
teddy |
1.28 |
while(iterator->next!=NULL |
592 |
|
|
&& iterator->next->item->content.ptr!=delimiter) |
593 |
masse |
1.24 |
iterator= iterator->next; |
594 |
|
|
|
595 |
|
|
/* Extract list */ |
596 |
teddy |
1.28 |
temp= env->head; |
597 |
|
|
env->head= iterator->next; |
598 |
masse |
1.24 |
iterator->next= NULL; |
599 |
|
|
|
600 |
teddy |
1.28 |
if(env->head!=NULL) |
601 |
|
|
toss(env); |
602 |
masse |
1.24 |
} |
603 |
masse |
1.19 |
|
604 |
|
|
/* Push list */ |
605 |
teddy |
1.28 |
pack= malloc(sizeof(value)); |
606 |
masse |
1.19 |
pack->type= list; |
607 |
|
|
pack->content.ptr= temp; |
608 |
teddy |
1.28 |
pack->refcount= 1; |
609 |
|
|
|
610 |
|
|
temp= malloc(sizeof(stackitem)); |
611 |
|
|
temp->item= pack; |
612 |
masse |
1.19 |
|
613 |
masse |
1.72 |
push(env, temp); |
614 |
teddy |
1.40 |
rev(env); |
615 |
masse |
1.19 |
} |
616 |
|
|
|
617 |
masse |
1.16 |
/* Relocate elements of the list on the stack. */ |
618 |
teddy |
1.28 |
extern void expand(environment *env) |
619 |
masse |
1.1 |
{ |
620 |
masse |
1.8 |
stackitem *temp, *new_head; |
621 |
|
|
|
622 |
masse |
1.16 |
/* Is top element a list? */ |
623 |
teddy |
1.36 |
if(env->head==NULL) { |
624 |
|
|
printerr("Too Few Arguments"); |
625 |
teddy |
1.35 |
env->err=1; |
626 |
masse |
1.8 |
return; |
627 |
masse |
1.17 |
} |
628 |
teddy |
1.36 |
if(env->head->item->type!=list) { |
629 |
|
|
printerr("Bad Argument Type"); |
630 |
|
|
env->err=2; |
631 |
|
|
return; |
632 |
|
|
} |
633 |
masse |
1.43 |
|
634 |
|
|
rev(env); |
635 |
|
|
|
636 |
|
|
if(env->err) |
637 |
|
|
return; |
638 |
masse |
1.8 |
|
639 |
masse |
1.16 |
/* The first list element is the new stack head */ |
640 |
teddy |
1.28 |
new_head= temp= env->head->item->content.ptr; |
641 |
masse |
1.8 |
|
642 |
teddy |
1.28 |
env->head->item->refcount++; |
643 |
|
|
toss(env); |
644 |
masse |
1.24 |
|
645 |
teddy |
1.28 |
/* Find the end of the list */ |
646 |
masse |
1.8 |
while(temp->next!=NULL) |
647 |
|
|
temp= temp->next; |
648 |
|
|
|
649 |
teddy |
1.28 |
/* Connect the tail of the list with the old stack head */ |
650 |
|
|
temp->next= env->head; |
651 |
|
|
env->head= new_head; /* ...and voila! */ |
652 |
|
|
|
653 |
teddy |
1.5 |
} |
654 |
masse |
1.11 |
|
655 |
masse |
1.14 |
/* Compares two elements by reference. */ |
656 |
teddy |
1.28 |
extern void eq(environment *env) |
657 |
masse |
1.11 |
{ |
658 |
|
|
void *left, *right; |
659 |
|
|
int result; |
660 |
|
|
|
661 |
teddy |
1.28 |
if((env->head)==NULL || env->head->next==NULL) { |
662 |
teddy |
1.36 |
printerr("Too Few Arguments"); |
663 |
teddy |
1.35 |
env->err=1; |
664 |
masse |
1.11 |
return; |
665 |
masse |
1.17 |
} |
666 |
masse |
1.11 |
|
667 |
teddy |
1.28 |
left= env->head->item->content.ptr; |
668 |
|
|
swap(env); |
669 |
|
|
right= env->head->item->content.ptr; |
670 |
masse |
1.11 |
result= (left==right); |
671 |
|
|
|
672 |
teddy |
1.28 |
toss(env); toss(env); |
673 |
masse |
1.72 |
push_int(env, result); |
674 |
masse |
1.11 |
} |
675 |
|
|
|
676 |
masse |
1.14 |
/* Negates the top element on the stack. */ |
677 |
teddy |
1.28 |
extern void not(environment *env) |
678 |
masse |
1.11 |
{ |
679 |
teddy |
1.28 |
int val; |
680 |
masse |
1.11 |
|
681 |
teddy |
1.36 |
if((env->head)==NULL) { |
682 |
|
|
printerr("Too Few Arguments"); |
683 |
teddy |
1.35 |
env->err=1; |
684 |
masse |
1.11 |
return; |
685 |
masse |
1.17 |
} |
686 |
masse |
1.11 |
|
687 |
teddy |
1.36 |
if(env->head->item->type!=integer) { |
688 |
|
|
printerr("Bad Argument Type"); |
689 |
|
|
env->err=2; |
690 |
|
|
return; |
691 |
|
|
} |
692 |
|
|
|
693 |
teddy |
1.28 |
val= env->head->item->content.val; |
694 |
|
|
toss(env); |
695 |
masse |
1.72 |
push_int(env, !val); |
696 |
masse |
1.11 |
} |
697 |
|
|
|
698 |
masse |
1.14 |
/* Compares the two top elements on the stack and return 0 if they're the |
699 |
|
|
same. */ |
700 |
teddy |
1.28 |
extern void neq(environment *env) |
701 |
masse |
1.11 |
{ |
702 |
teddy |
1.28 |
eq(env); |
703 |
|
|
not(env); |
704 |
masse |
1.11 |
} |
705 |
masse |
1.12 |
|
706 |
masse |
1.14 |
/* Give a symbol some content. */ |
707 |
teddy |
1.28 |
extern void def(environment *env) |
708 |
masse |
1.12 |
{ |
709 |
teddy |
1.28 |
symbol *sym; |
710 |
masse |
1.12 |
|
711 |
teddy |
1.28 |
/* Needs two values on the stack, the top one must be a symbol */ |
712 |
teddy |
1.36 |
if(env->head==NULL || env->head->next==NULL) { |
713 |
|
|
printerr("Too Few Arguments"); |
714 |
teddy |
1.35 |
env->err=1; |
715 |
masse |
1.12 |
return; |
716 |
masse |
1.17 |
} |
717 |
masse |
1.12 |
|
718 |
teddy |
1.36 |
if(env->head->item->type!=symb) { |
719 |
|
|
printerr("Bad Argument Type"); |
720 |
|
|
env->err=2; |
721 |
|
|
return; |
722 |
|
|
} |
723 |
|
|
|
724 |
teddy |
1.28 |
/* long names are a pain */ |
725 |
|
|
sym=env->head->item->content.ptr; |
726 |
|
|
|
727 |
|
|
/* if the symbol was bound to something else, throw it away */ |
728 |
|
|
if(sym->val != NULL) |
729 |
|
|
free_val(sym->val); |
730 |
|
|
|
731 |
|
|
/* Bind the symbol to the value */ |
732 |
|
|
sym->val= env->head->next->item; |
733 |
|
|
sym->val->refcount++; /* Increase the reference counter */ |
734 |
masse |
1.12 |
|
735 |
teddy |
1.28 |
toss(env); toss(env); |
736 |
masse |
1.12 |
} |
737 |
masse |
1.10 |
|
738 |
masse |
1.14 |
/* Quit stack. */ |
739 |
teddy |
1.28 |
extern void quit(environment *env) |
740 |
teddy |
1.5 |
{ |
741 |
|
|
exit(EXIT_SUCCESS); |
742 |
masse |
1.24 |
} |
743 |
|
|
|
744 |
|
|
/* Clear stack */ |
745 |
teddy |
1.28 |
extern void clear(environment *env) |
746 |
masse |
1.24 |
{ |
747 |
teddy |
1.28 |
while(env->head!=NULL) |
748 |
|
|
toss(env); |
749 |
masse |
1.1 |
} |
750 |
|
|
|
751 |
teddy |
1.33 |
/* List all defined words */ |
752 |
masse |
1.32 |
extern void words(environment *env) |
753 |
|
|
{ |
754 |
|
|
symbol *temp; |
755 |
|
|
int i; |
756 |
|
|
|
757 |
|
|
for(i= 0; i<HASHTBLSIZE; i++) { |
758 |
|
|
temp= env->symbols[i]; |
759 |
|
|
while(temp!=NULL) { |
760 |
|
|
printf("%s\n", temp->id); |
761 |
|
|
temp= temp->next; |
762 |
|
|
} |
763 |
|
|
} |
764 |
|
|
} |
765 |
masse |
1.34 |
|
766 |
|
|
/* Forgets a symbol (remove it from the hash table) */ |
767 |
|
|
extern void forget(environment *env) |
768 |
|
|
{ |
769 |
|
|
char* sym_id; |
770 |
|
|
stackitem *stack_head= env->head; |
771 |
|
|
symbol **hash_entry, *temp; |
772 |
|
|
|
773 |
teddy |
1.36 |
if(stack_head==NULL) { |
774 |
|
|
printerr("Too Few Arguments"); |
775 |
|
|
env->err=1; |
776 |
|
|
return; |
777 |
|
|
} |
778 |
|
|
|
779 |
|
|
if(stack_head->item->type!=symb) { |
780 |
|
|
printerr("Bad Argument Type"); |
781 |
|
|
env->err=2; |
782 |
masse |
1.34 |
return; |
783 |
|
|
} |
784 |
|
|
|
785 |
|
|
sym_id= ((symbol*)(stack_head->item->content.ptr))->id; |
786 |
|
|
toss(env); |
787 |
|
|
|
788 |
|
|
hash_entry= hash(env->symbols, sym_id); |
789 |
|
|
temp= *hash_entry; |
790 |
|
|
*hash_entry= (*hash_entry)->next; |
791 |
|
|
|
792 |
|
|
if(temp->val!=NULL) { |
793 |
|
|
free_val(temp->val); |
794 |
|
|
} |
795 |
|
|
free(temp->id); |
796 |
|
|
free(temp); |
797 |
teddy |
1.36 |
} |
798 |
|
|
|
799 |
|
|
/* Returns the current error number to the stack */ |
800 |
|
|
extern void errn(environment *env){ |
801 |
masse |
1.72 |
push_int(env, env->err); |
802 |
teddy |
1.36 |
} |
803 |
masse |
1.32 |
|
804 |
masse |
1.69 |
extern void read(environment*); |
805 |
|
|
|
806 |
masse |
1.1 |
int main() |
807 |
|
|
{ |
808 |
teddy |
1.28 |
environment myenv; |
809 |
masse |
1.1 |
|
810 |
teddy |
1.28 |
init_env(&myenv); |
811 |
masse |
1.1 |
|
812 |
masse |
1.69 |
while(1) { |
813 |
masse |
1.70 |
if(myenv.in_string==NULL) |
814 |
masse |
1.71 |
printstack(&myenv); |
815 |
masse |
1.69 |
read(&myenv); |
816 |
teddy |
1.35 |
if(myenv.err) { |
817 |
|
|
printf("(error %d) ", myenv.err); |
818 |
|
|
myenv.err=0; |
819 |
masse |
1.71 |
} else if(myenv.head!=NULL |
820 |
|
|
&& myenv.head->item->type==symb |
821 |
masse |
1.69 |
&& ((symbol*)(myenv.head->item->content.ptr))->id[0]==';') { |
822 |
|
|
toss(&myenv); /* No error check in main */ |
823 |
|
|
eval(&myenv); |
824 |
teddy |
1.35 |
} |
825 |
masse |
1.1 |
} |
826 |
teddy |
1.41 |
quit(&myenv); |
827 |
teddy |
1.42 |
return EXIT_FAILURE; |
828 |
teddy |
1.48 |
} |
829 |
|
|
|
830 |
|
|
/* + */ |
831 |
|
|
extern void sx_2b(environment *env) { |
832 |
|
|
int a, b; |
833 |
masse |
1.49 |
size_t len; |
834 |
|
|
char* new_string; |
835 |
|
|
value *a_val, *b_val; |
836 |
teddy |
1.48 |
|
837 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
838 |
|
|
printerr("Too Few Arguments"); |
839 |
|
|
env->err=1; |
840 |
masse |
1.49 |
return; |
841 |
|
|
} |
842 |
|
|
|
843 |
|
|
if(env->head->item->type==string |
844 |
|
|
&& env->head->next->item->type==string) { |
845 |
|
|
a_val= env->head->item; |
846 |
|
|
b_val= env->head->next->item; |
847 |
|
|
a_val->refcount++; |
848 |
|
|
b_val->refcount++; |
849 |
|
|
toss(env); if(env->err) return; |
850 |
|
|
toss(env); if(env->err) return; |
851 |
|
|
len= strlen(a_val->content.ptr)+strlen(b_val->content.ptr)+1; |
852 |
|
|
new_string= malloc(len); |
853 |
|
|
strcpy(new_string, b_val->content.ptr); |
854 |
|
|
strcat(new_string, a_val->content.ptr); |
855 |
|
|
free_val(a_val); free_val(b_val); |
856 |
masse |
1.72 |
push_cstring(env, new_string); |
857 |
masse |
1.49 |
free(new_string); |
858 |
teddy |
1.48 |
return; |
859 |
|
|
} |
860 |
|
|
|
861 |
|
|
if(env->head->item->type!=integer |
862 |
|
|
|| env->head->next->item->type!=integer) { |
863 |
|
|
printerr("Bad Argument Type"); |
864 |
|
|
env->err=2; |
865 |
|
|
return; |
866 |
|
|
} |
867 |
|
|
a=env->head->item->content.val; |
868 |
|
|
toss(env); |
869 |
|
|
if(env->err) return; |
870 |
teddy |
1.62 |
if(env->head->item->refcount == 1) |
871 |
|
|
env->head->item->content.val += a; |
872 |
|
|
else { |
873 |
|
|
b=env->head->item->content.val; |
874 |
|
|
toss(env); |
875 |
|
|
if(env->err) return; |
876 |
masse |
1.72 |
push_int(env, a+b); |
877 |
teddy |
1.62 |
} |
878 |
masse |
1.1 |
} |
879 |
teddy |
1.55 |
|
880 |
teddy |
1.60 |
/* - */ |
881 |
|
|
extern void sx_2d(environment *env) { |
882 |
teddy |
1.62 |
int a, b; |
883 |
teddy |
1.60 |
|
884 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
885 |
|
|
printerr("Too Few Arguments"); |
886 |
|
|
env->err=1; |
887 |
|
|
return; |
888 |
|
|
} |
889 |
|
|
|
890 |
|
|
if(env->head->item->type!=integer |
891 |
|
|
|| env->head->next->item->type!=integer) { |
892 |
|
|
printerr("Bad Argument Type"); |
893 |
|
|
env->err=2; |
894 |
|
|
return; |
895 |
|
|
} |
896 |
|
|
a=env->head->item->content.val; |
897 |
|
|
toss(env); |
898 |
|
|
if(env->err) return; |
899 |
teddy |
1.62 |
if(env->head->item->refcount == 1) |
900 |
|
|
env->head->item->content.val -= a; |
901 |
|
|
else { |
902 |
|
|
b=env->head->item->content.val; |
903 |
|
|
toss(env); |
904 |
|
|
if(env->err) return; |
905 |
masse |
1.72 |
push_int(env, b-a); |
906 |
teddy |
1.62 |
} |
907 |
teddy |
1.60 |
} |
908 |
|
|
|
909 |
teddy |
1.61 |
/* > */ |
910 |
|
|
extern void sx_3e(environment *env) { |
911 |
teddy |
1.62 |
int a, b; |
912 |
teddy |
1.61 |
|
913 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
914 |
|
|
printerr("Too Few Arguments"); |
915 |
|
|
env->err=1; |
916 |
|
|
return; |
917 |
|
|
} |
918 |
|
|
|
919 |
|
|
if(env->head->item->type!=integer |
920 |
|
|
|| env->head->next->item->type!=integer) { |
921 |
|
|
printerr("Bad Argument Type"); |
922 |
|
|
env->err=2; |
923 |
|
|
return; |
924 |
|
|
} |
925 |
|
|
a=env->head->item->content.val; |
926 |
|
|
toss(env); |
927 |
|
|
if(env->err) return; |
928 |
teddy |
1.62 |
if(env->head->item->refcount == 1) |
929 |
|
|
env->head->item->content.val = (env->head->item->content.val > a); |
930 |
|
|
else { |
931 |
|
|
b=env->head->item->content.val; |
932 |
|
|
toss(env); |
933 |
|
|
if(env->err) return; |
934 |
masse |
1.72 |
push_int(env, b>a); |
935 |
teddy |
1.62 |
} |
936 |
teddy |
1.61 |
} |
937 |
|
|
|
938 |
teddy |
1.55 |
/* Return copy of a value */ |
939 |
|
|
value *copy_val(value *old_value){ |
940 |
|
|
stackitem *old_item, *new_item, *prev_item; |
941 |
|
|
|
942 |
|
|
value *new_value=malloc(sizeof(value)); |
943 |
|
|
|
944 |
|
|
new_value->type=old_value->type; |
945 |
|
|
new_value->refcount=0; /* This is increased if/when this |
946 |
|
|
value is referenced somewhere, like |
947 |
|
|
in a stack item or a variable */ |
948 |
|
|
switch(old_value->type){ |
949 |
|
|
case integer: |
950 |
|
|
new_value->content.val=old_value->content.val; |
951 |
|
|
break; |
952 |
|
|
case string: |
953 |
|
|
(char *)(new_value->content.ptr) |
954 |
|
|
= strdup((char *)(old_value->content.ptr)); |
955 |
|
|
break; |
956 |
|
|
case func: |
957 |
|
|
case symb: |
958 |
|
|
new_value->content.ptr=old_value->content.ptr; |
959 |
|
|
break; |
960 |
|
|
case list: |
961 |
|
|
new_value->content.ptr=NULL; |
962 |
|
|
|
963 |
|
|
prev_item=NULL; |
964 |
|
|
old_item=(stackitem *)(old_value->content.ptr); |
965 |
|
|
|
966 |
|
|
while(old_item != NULL) { /* While list is not empty */ |
967 |
|
|
new_item= malloc(sizeof(stackitem)); |
968 |
|
|
new_item->item=copy_val(old_item->item); /* recurse */ |
969 |
|
|
new_item->next=NULL; |
970 |
|
|
if(prev_item != NULL) /* If this wasn't the first item */ |
971 |
|
|
prev_item->next=new_item; /* point the previous item to the |
972 |
|
|
new item */ |
973 |
|
|
else |
974 |
|
|
new_value->content.ptr=new_item; |
975 |
|
|
old_item=old_item->next; |
976 |
|
|
prev_item=new_item; |
977 |
|
|
} |
978 |
|
|
break; |
979 |
|
|
} |
980 |
|
|
return new_value; |
981 |
|
|
} |
982 |
|
|
|
983 |
|
|
/* duplicates an item on the stack */ |
984 |
|
|
extern void dup(environment *env) { |
985 |
|
|
if((env->head)==NULL) { |
986 |
|
|
printerr("Too Few Arguments"); |
987 |
|
|
env->err=1; |
988 |
|
|
return; |
989 |
|
|
} |
990 |
masse |
1.72 |
push_val(env, copy_val(env->head->item)); |
991 |
teddy |
1.55 |
} |
992 |
teddy |
1.56 |
|
993 |
teddy |
1.59 |
/* "if", If-Then */ |
994 |
masse |
1.57 |
extern void sx_6966(environment *env) { |
995 |
teddy |
1.56 |
|
996 |
|
|
int truth; |
997 |
|
|
|
998 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
999 |
|
|
printerr("Too Few Arguments"); |
1000 |
|
|
env->err=1; |
1001 |
|
|
return; |
1002 |
|
|
} |
1003 |
|
|
|
1004 |
|
|
if(env->head->next->item->type != integer) { |
1005 |
|
|
printerr("Bad Argument Type"); |
1006 |
|
|
env->err=2; |
1007 |
|
|
return; |
1008 |
|
|
} |
1009 |
|
|
|
1010 |
|
|
swap(env); |
1011 |
|
|
if(env->err) return; |
1012 |
|
|
|
1013 |
|
|
truth=env->head->item->content.val; |
1014 |
|
|
|
1015 |
|
|
toss(env); |
1016 |
|
|
if(env->err) return; |
1017 |
|
|
|
1018 |
|
|
if(truth) |
1019 |
|
|
eval(env); |
1020 |
|
|
else |
1021 |
|
|
toss(env); |
1022 |
|
|
} |
1023 |
|
|
|
1024 |
|
|
/* If-Then-Else */ |
1025 |
masse |
1.57 |
extern void ifelse(environment *env) { |
1026 |
teddy |
1.56 |
|
1027 |
|
|
int truth; |
1028 |
|
|
|
1029 |
|
|
if((env->head)==NULL || env->head->next==NULL |
1030 |
|
|
|| env->head->next->next==NULL) { |
1031 |
|
|
printerr("Too Few Arguments"); |
1032 |
|
|
env->err=1; |
1033 |
|
|
return; |
1034 |
|
|
} |
1035 |
|
|
|
1036 |
|
|
if(env->head->next->next->item->type != integer) { |
1037 |
|
|
printerr("Bad Argument Type"); |
1038 |
|
|
env->err=2; |
1039 |
|
|
return; |
1040 |
|
|
} |
1041 |
|
|
|
1042 |
|
|
rot(env); |
1043 |
|
|
if(env->err) return; |
1044 |
|
|
|
1045 |
|
|
truth=env->head->item->content.val; |
1046 |
|
|
|
1047 |
|
|
toss(env); |
1048 |
|
|
if(env->err) return; |
1049 |
|
|
|
1050 |
|
|
if(!truth) |
1051 |
|
|
swap(env); |
1052 |
|
|
if(env->err) return; |
1053 |
|
|
|
1054 |
|
|
toss(env); |
1055 |
|
|
if(env->err) return; |
1056 |
|
|
|
1057 |
|
|
eval(env); |
1058 |
masse |
1.58 |
} |
1059 |
|
|
|
1060 |
|
|
/* while */ |
1061 |
|
|
extern void sx_7768696c65(environment *env) { |
1062 |
|
|
|
1063 |
|
|
int truth; |
1064 |
masse |
1.63 |
value *loop, *test; |
1065 |
masse |
1.58 |
|
1066 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
1067 |
|
|
printerr("Too Few Arguments"); |
1068 |
|
|
env->err=1; |
1069 |
|
|
return; |
1070 |
|
|
} |
1071 |
|
|
|
1072 |
masse |
1.63 |
loop= env->head->item; |
1073 |
|
|
loop->refcount++; |
1074 |
|
|
toss(env); if(env->err) return; |
1075 |
|
|
|
1076 |
|
|
test= env->head->item; |
1077 |
|
|
test->refcount++; |
1078 |
|
|
toss(env); if(env->err) return; |
1079 |
|
|
|
1080 |
masse |
1.58 |
do { |
1081 |
masse |
1.72 |
push_val(env, test); |
1082 |
masse |
1.63 |
eval(env); |
1083 |
masse |
1.58 |
|
1084 |
|
|
if(env->head->item->type != integer) { |
1085 |
|
|
printerr("Bad Argument Type"); |
1086 |
|
|
env->err=2; |
1087 |
|
|
return; |
1088 |
|
|
} |
1089 |
|
|
|
1090 |
|
|
truth= env->head->item->content.val; |
1091 |
|
|
toss(env); if(env->err) return; |
1092 |
|
|
|
1093 |
|
|
if(truth) { |
1094 |
masse |
1.72 |
push_val(env, loop); |
1095 |
masse |
1.58 |
eval(env); |
1096 |
|
|
} else { |
1097 |
|
|
toss(env); |
1098 |
|
|
} |
1099 |
|
|
|
1100 |
|
|
} while(truth); |
1101 |
masse |
1.63 |
|
1102 |
|
|
free_val(test); |
1103 |
|
|
free_val(loop); |
1104 |
teddy |
1.56 |
} |
1105 |
masse |
1.65 |
|
1106 |
|
|
/* For-loop */ |
1107 |
|
|
extern void sx_666f72(environment *env) { |
1108 |
|
|
|
1109 |
|
|
value *loop, *foo; |
1110 |
|
|
stackitem *iterator; |
1111 |
|
|
|
1112 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
1113 |
|
|
printerr("Too Few Arguments"); |
1114 |
|
|
env->err=1; |
1115 |
|
|
return; |
1116 |
|
|
} |
1117 |
|
|
|
1118 |
|
|
if(env->head->next->item->type != list) { |
1119 |
|
|
printerr("Bad Argument Type"); |
1120 |
|
|
env->err=2; |
1121 |
|
|
return; |
1122 |
|
|
} |
1123 |
|
|
|
1124 |
|
|
loop= env->head->item; |
1125 |
|
|
loop->refcount++; |
1126 |
|
|
toss(env); if(env->err) return; |
1127 |
|
|
|
1128 |
|
|
foo= env->head->item; |
1129 |
|
|
foo->refcount++; |
1130 |
|
|
toss(env); if(env->err) return; |
1131 |
|
|
|
1132 |
|
|
iterator= foo->content.ptr; |
1133 |
|
|
|
1134 |
|
|
while(iterator!=NULL) { |
1135 |
masse |
1.72 |
push_val(env, iterator->item); |
1136 |
|
|
push_val(env, loop); |
1137 |
masse |
1.65 |
eval(env); if(env->err) return; |
1138 |
|
|
iterator= iterator->next; |
1139 |
|
|
} |
1140 |
|
|
|
1141 |
|
|
free_val(loop); |
1142 |
|
|
free_val(foo); |
1143 |
|
|
} |
1144 |
masse |
1.66 |
|
1145 |
|
|
/* 'to' */ |
1146 |
|
|
extern void to(environment *env) { |
1147 |
|
|
int i, start, ending; |
1148 |
|
|
|
1149 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
1150 |
|
|
printerr("Too Few Arguments"); |
1151 |
|
|
env->err=1; |
1152 |
|
|
return; |
1153 |
|
|
} |
1154 |
|
|
|
1155 |
|
|
if(env->head->item->type!=integer |
1156 |
|
|
|| env->head->next->item->type!=integer) { |
1157 |
|
|
printerr("Bad Argument Type"); |
1158 |
|
|
env->err=2; |
1159 |
|
|
return; |
1160 |
|
|
} |
1161 |
|
|
|
1162 |
|
|
ending= env->head->item->content.val; |
1163 |
|
|
toss(env); if(env->err) return; |
1164 |
|
|
start= env->head->item->content.val; |
1165 |
|
|
toss(env); if(env->err) return; |
1166 |
|
|
|
1167 |
|
|
push_sym(env, "["); |
1168 |
|
|
|
1169 |
masse |
1.67 |
if(ending>=start) { |
1170 |
|
|
for(i= start; i<=ending; i++) |
1171 |
masse |
1.72 |
push_int(env, i); |
1172 |
masse |
1.67 |
} else { |
1173 |
|
|
for(i= start; i>=ending; i--) |
1174 |
masse |
1.72 |
push_int(env, i); |
1175 |
masse |
1.67 |
} |
1176 |
masse |
1.66 |
|
1177 |
|
|
push_sym(env, "["); |
1178 |
|
|
pack(env); if(env->err) return; |
1179 |
|
|
} |
1180 |
masse |
1.68 |
|
1181 |
|
|
/* Read a string */ |
1182 |
|
|
extern void readline(environment *env) { |
1183 |
|
|
char in_string[101]; |
1184 |
|
|
|
1185 |
|
|
fgets(in_string, 100, stdin); |
1186 |
masse |
1.72 |
push_cstring(env, in_string); |
1187 |
masse |
1.68 |
} |
1188 |
|
|
|
1189 |
|
|
/* Read a value and place on stack */ |
1190 |
|
|
extern void read(environment *env) { |
1191 |
masse |
1.71 |
const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%[\001-\377]"; |
1192 |
|
|
const char strform[]= "\"%[^\"]\"%[\001-\377]"; |
1193 |
|
|
const char intform[]= "%i%[\001-\377]"; |
1194 |
|
|
const char blankform[]= "%*[ \t]%[\001-\377]"; |
1195 |
|
|
const char ebrackform[]= "%*1[]]%[\001-\377]"; |
1196 |
|
|
const char semicform[]= "%*1[;]%[\001-\377]"; |
1197 |
|
|
const char bbrackform[]= "%*1[[]%[\001-\377]"; |
1198 |
masse |
1.68 |
|
1199 |
masse |
1.71 |
int itemp; |
1200 |
masse |
1.68 |
static int depth= 0; |
1201 |
|
|
char *rest, *match; |
1202 |
|
|
size_t inlength; |
1203 |
|
|
|
1204 |
masse |
1.70 |
if(env->in_string==NULL) { |
1205 |
masse |
1.68 |
readline(env); if(env->err) return; |
1206 |
|
|
|
1207 |
masse |
1.70 |
env->in_string= malloc(strlen(env->head->item->content.ptr)+1); |
1208 |
|
|
strcpy(env->in_string, env->head->item->content.ptr); |
1209 |
masse |
1.68 |
toss(env); if(env->err) return; |
1210 |
|
|
} |
1211 |
|
|
|
1212 |
masse |
1.70 |
inlength= strlen(env->in_string)+1; |
1213 |
masse |
1.68 |
match= malloc(inlength); |
1214 |
|
|
rest= malloc(inlength); |
1215 |
|
|
|
1216 |
masse |
1.70 |
if(sscanf(env->in_string, blankform, rest)) { |
1217 |
masse |
1.71 |
; |
1218 |
masse |
1.70 |
} else if(sscanf(env->in_string, intform, &itemp, rest) > 0) { |
1219 |
masse |
1.72 |
push_int(env, itemp); |
1220 |
masse |
1.70 |
} else if(sscanf(env->in_string, strform, match, rest) > 0) { |
1221 |
masse |
1.72 |
push_cstring(env, match); |
1222 |
masse |
1.70 |
} else if(sscanf(env->in_string, symbform, match, rest) > 0) { |
1223 |
masse |
1.68 |
push_sym(env, match); |
1224 |
masse |
1.70 |
} else if(sscanf(env->in_string, ebrackform, rest) > 0) { |
1225 |
masse |
1.68 |
push_sym(env, "["); |
1226 |
|
|
pack(env); if(env->err) return; |
1227 |
|
|
if(depth!=0) depth--; |
1228 |
masse |
1.70 |
} else if(sscanf(env->in_string, semicform, rest) > 0) { |
1229 |
masse |
1.68 |
push_sym(env, ";"); |
1230 |
masse |
1.70 |
} else if(sscanf(env->in_string, bbrackform, rest) > 0) { |
1231 |
masse |
1.68 |
push_sym(env, "["); |
1232 |
|
|
depth++; |
1233 |
|
|
} else { |
1234 |
|
|
free(rest); |
1235 |
|
|
rest= NULL; |
1236 |
|
|
} |
1237 |
|
|
|
1238 |
masse |
1.70 |
free(env->in_string); |
1239 |
masse |
1.68 |
free(match); |
1240 |
|
|
|
1241 |
masse |
1.70 |
env->in_string= rest; |
1242 |
masse |
1.68 |
|
1243 |
masse |
1.71 |
if(depth) |
1244 |
masse |
1.68 |
return read(env); |
1245 |
|
|
} |