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 |
|
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#include <unistd.h> |
13 |
|
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/* EX_NOINPUT, EX_USAGE */ |
14 |
|
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#include <sysexits.h> |
15 |
masse |
1.83 |
/* mtrace, muntrace */ |
16 |
|
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#include <mcheck.h> |
17 |
masse |
1.1 |
|
18 |
teddy |
1.88 |
#include "stack.h" |
19 |
masse |
1.1 |
|
20 |
teddy |
1.28 |
/* Initialize a newly created environment */ |
21 |
|
|
void init_env(environment *env) |
22 |
masse |
1.1 |
{ |
23 |
masse |
1.46 |
int i; |
24 |
masse |
1.1 |
|
25 |
masse |
1.87 |
env->gc_limit= 20; |
26 |
|
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env->gc_count= 0; |
27 |
|
|
|
28 |
teddy |
1.84 |
env->head= NULL; |
29 |
masse |
1.1 |
for(i= 0; i<HASHTBLSIZE; i++) |
30 |
teddy |
1.28 |
env->symbols[i]= NULL; |
31 |
teddy |
1.84 |
env->err= 0; |
32 |
|
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env->in_string= NULL; |
33 |
|
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env->free_string= NULL; |
34 |
|
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env->inputstream= stdin; |
35 |
|
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env->interactive= 1; |
36 |
masse |
1.1 |
} |
37 |
|
|
|
38 |
teddy |
1.48 |
void printerr(const char* in_string) { |
39 |
|
|
fprintf(stderr, "Err: %s\n", in_string); |
40 |
|
|
} |
41 |
|
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|
42 |
|
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/* Discard the top element of the stack. */ |
43 |
|
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extern void toss(environment *env) |
44 |
|
|
{ |
45 |
|
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stackitem *temp= env->head; |
46 |
|
|
|
47 |
|
|
if((env->head)==NULL) { |
48 |
|
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printerr("Too Few Arguments"); |
49 |
|
|
env->err=1; |
50 |
|
|
return; |
51 |
|
|
} |
52 |
|
|
|
53 |
|
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env->head= env->head->next; /* Remove the top stack item */ |
54 |
|
|
free(temp); /* Free the old top stack item */ |
55 |
|
|
} |
56 |
|
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|
57 |
teddy |
1.27 |
/* Returns a pointer to a pointer to an element in the hash table. */ |
58 |
teddy |
1.28 |
symbol **hash(hashtbl in_hashtbl, const char *in_string) |
59 |
masse |
1.1 |
{ |
60 |
masse |
1.46 |
int i= 0; |
61 |
|
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unsigned int out_hash= 0; |
62 |
teddy |
1.18 |
char key= '\0'; |
63 |
teddy |
1.28 |
symbol **position; |
64 |
masse |
1.1 |
|
65 |
masse |
1.16 |
while(1){ /* Hash in_string */ |
66 |
masse |
1.1 |
key= in_string[i++]; |
67 |
|
|
if(key=='\0') |
68 |
|
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break; |
69 |
|
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out_hash= out_hash*32+key; |
70 |
|
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} |
71 |
|
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|
72 |
|
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out_hash= out_hash%HASHTBLSIZE; |
73 |
|
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position= &(in_hashtbl[out_hash]); |
74 |
|
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|
75 |
masse |
1.25 |
while(1){ |
76 |
teddy |
1.18 |
if(*position==NULL) /* If empty */ |
77 |
masse |
1.1 |
return position; |
78 |
|
|
|
79 |
teddy |
1.18 |
if(strcmp(in_string, (*position)->id)==0) /* If match */ |
80 |
masse |
1.1 |
return position; |
81 |
|
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|
82 |
masse |
1.16 |
position= &((*position)->next); /* Try next */ |
83 |
masse |
1.1 |
} |
84 |
|
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} |
85 |
|
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|
86 |
masse |
1.87 |
value* new_val(environment *env) { |
87 |
|
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value *nval= malloc(sizeof(value)); |
88 |
|
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stackitem *nitem= malloc(sizeof(stackitem)); |
89 |
|
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|
90 |
|
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if(env->gc_count >= env->gc_limit) |
91 |
|
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gc_init(env); |
92 |
|
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|
93 |
|
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nval->content.ptr= NULL; |
94 |
|
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|
95 |
|
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nitem->item= nval; |
96 |
|
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nitem->next= env->gc_ref; |
97 |
|
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env->gc_ref= nitem; |
98 |
|
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|
99 |
|
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env->gc_count++; |
100 |
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|
101 |
|
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return nval; |
102 |
|
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} |
103 |
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|
104 |
|
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void gc_mark(value *val) { |
105 |
|
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stackitem *iterator; |
106 |
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|
107 |
|
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if(val==NULL || val->gc_garb==0) |
108 |
|
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return; |
109 |
|
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|
110 |
|
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val->gc_garb= 0; |
111 |
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|
112 |
|
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if(val->type==list) { |
113 |
|
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iterator= val->content.ptr; |
114 |
|
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|
115 |
|
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while(iterator!=NULL) { |
116 |
|
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gc_mark(iterator->item); |
117 |
|
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iterator= iterator->next; |
118 |
|
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} |
119 |
|
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} |
120 |
|
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} |
121 |
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|
122 |
|
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extern void gc_init(environment *env) { |
123 |
|
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stackitem *new_head= NULL, *titem, *iterator= env->gc_ref; |
124 |
|
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symbol *tsymb; |
125 |
|
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int i; |
126 |
|
|
|
127 |
|
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while(iterator!=NULL) { |
128 |
|
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iterator->item->gc_garb= 1; |
129 |
|
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iterator= iterator->next; |
130 |
|
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} |
131 |
|
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|
132 |
|
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/* Mark */ |
133 |
|
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iterator= env->head; |
134 |
|
|
while(iterator!=NULL) { |
135 |
|
|
gc_mark(iterator->item); |
136 |
|
|
iterator= iterator->next; |
137 |
|
|
} |
138 |
|
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|
139 |
|
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for(i= 0; i<HASHTBLSIZE; i++) { |
140 |
|
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tsymb= env->symbols[i]; |
141 |
|
|
while(tsymb!=NULL) { |
142 |
|
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gc_mark(tsymb->val); |
143 |
|
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tsymb= tsymb->next; |
144 |
|
|
} |
145 |
|
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} |
146 |
|
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|
147 |
|
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env->gc_count= 0; |
148 |
|
|
|
149 |
|
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/* Sweep */ |
150 |
|
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while(env->gc_ref!=NULL) { |
151 |
|
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if(env->gc_ref->item->gc_garb) { |
152 |
|
|
switch(env->gc_ref->item->type) { |
153 |
|
|
case string: |
154 |
|
|
free(env->gc_ref->item->content.ptr); |
155 |
|
|
break; |
156 |
|
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case integer: |
157 |
|
|
break; |
158 |
|
|
case list: |
159 |
|
|
while(env->gc_ref->item->content.ptr!=NULL) { |
160 |
|
|
titem= env->gc_ref->item->content.ptr; |
161 |
|
|
env->gc_ref->item->content.ptr= titem->next; |
162 |
|
|
free(titem); |
163 |
|
|
} |
164 |
|
|
break; |
165 |
|
|
default: |
166 |
|
|
break; |
167 |
|
|
} |
168 |
|
|
free(env->gc_ref->item); |
169 |
|
|
titem= env->gc_ref->next; |
170 |
|
|
free(env->gc_ref); |
171 |
|
|
env->gc_ref= titem; |
172 |
|
|
} else { |
173 |
|
|
titem= env->gc_ref->next; |
174 |
|
|
env->gc_ref->next= new_head; |
175 |
|
|
new_head= env->gc_ref; |
176 |
|
|
env->gc_ref= titem; |
177 |
|
|
env->gc_count++; |
178 |
|
|
} |
179 |
|
|
} |
180 |
|
|
|
181 |
|
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env->gc_limit= env->gc_count+20; |
182 |
|
|
env->gc_ref= new_head; |
183 |
|
|
} |
184 |
|
|
|
185 |
teddy |
1.29 |
/* Push a value onto the stack */ |
186 |
masse |
1.72 |
void push_val(environment *env, value *val) |
187 |
teddy |
1.29 |
{ |
188 |
|
|
stackitem *new_item= malloc(sizeof(stackitem)); |
189 |
|
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new_item->item= val; |
190 |
masse |
1.75 |
new_item->next= env->head; |
191 |
|
|
env->head= new_item; |
192 |
teddy |
1.29 |
} |
193 |
|
|
|
194 |
teddy |
1.28 |
/* Push an integer onto the stack. */ |
195 |
masse |
1.72 |
void push_int(environment *env, int in_val) |
196 |
masse |
1.1 |
{ |
197 |
masse |
1.87 |
value *new_value= new_val(env); |
198 |
teddy |
1.28 |
|
199 |
|
|
new_value->content.val= in_val; |
200 |
|
|
new_value->type= integer; |
201 |
masse |
1.1 |
|
202 |
masse |
1.75 |
push_val(env, new_value); |
203 |
masse |
1.1 |
} |
204 |
|
|
|
205 |
masse |
1.14 |
/* Copy a string onto the stack. */ |
206 |
masse |
1.72 |
void push_cstring(environment *env, const char *in_string) |
207 |
masse |
1.1 |
{ |
208 |
masse |
1.87 |
value *new_value= new_val(env); |
209 |
teddy |
1.28 |
|
210 |
|
|
new_value->content.ptr= malloc(strlen(in_string)+1); |
211 |
|
|
strcpy(new_value->content.ptr, in_string); |
212 |
|
|
new_value->type= string; |
213 |
masse |
1.1 |
|
214 |
masse |
1.75 |
push_val(env, new_value); |
215 |
masse |
1.1 |
} |
216 |
|
|
|
217 |
teddy |
1.48 |
/* Mangle a symbol name to a valid C identifier name */ |
218 |
teddy |
1.51 |
char *mangle_str(const char *old_string){ |
219 |
teddy |
1.48 |
char validchars[] |
220 |
|
|
="0123456789abcdef"; |
221 |
|
|
char *new_string, *current; |
222 |
|
|
|
223 |
teddy |
1.50 |
new_string=malloc((strlen(old_string)*2)+4); |
224 |
teddy |
1.48 |
strcpy(new_string, "sx_"); /* Stack eXternal */ |
225 |
|
|
current=new_string+3; |
226 |
|
|
while(old_string[0] != '\0'){ |
227 |
teddy |
1.53 |
current[0]=validchars[(unsigned char)(old_string[0])/16]; |
228 |
|
|
current[1]=validchars[(unsigned char)(old_string[0])%16]; |
229 |
teddy |
1.48 |
current+=2; |
230 |
|
|
old_string++; |
231 |
|
|
} |
232 |
|
|
current[0]='\0'; |
233 |
|
|
|
234 |
|
|
return new_string; /* The caller must free() it */ |
235 |
|
|
} |
236 |
|
|
|
237 |
|
|
extern void mangle(environment *env){ |
238 |
|
|
char *new_string; |
239 |
|
|
|
240 |
|
|
if((env->head)==NULL) { |
241 |
|
|
printerr("Too Few Arguments"); |
242 |
|
|
env->err=1; |
243 |
|
|
return; |
244 |
|
|
} |
245 |
|
|
|
246 |
|
|
if(env->head->item->type!=string) { |
247 |
|
|
printerr("Bad Argument Type"); |
248 |
|
|
env->err=2; |
249 |
|
|
return; |
250 |
|
|
} |
251 |
|
|
|
252 |
teddy |
1.51 |
new_string= mangle_str((const char *)(env->head->item->content.ptr)); |
253 |
teddy |
1.48 |
|
254 |
|
|
toss(env); |
255 |
|
|
if(env->err) return; |
256 |
|
|
|
257 |
masse |
1.81 |
push_cstring(env, new_string); |
258 |
teddy |
1.48 |
} |
259 |
|
|
|
260 |
teddy |
1.28 |
/* Push a symbol onto the stack. */ |
261 |
teddy |
1.35 |
void push_sym(environment *env, const char *in_string) |
262 |
masse |
1.1 |
{ |
263 |
teddy |
1.28 |
value *new_value; /* A new symbol value */ |
264 |
|
|
/* ...which might point to... */ |
265 |
teddy |
1.29 |
symbol **new_symbol; /* (if needed) A new actual symbol */ |
266 |
teddy |
1.28 |
/* ...which, if possible, will be bound to... */ |
267 |
|
|
value *new_fvalue; /* (if needed) A new function value */ |
268 |
|
|
/* ...which will point to... */ |
269 |
|
|
void *funcptr; /* A function pointer */ |
270 |
|
|
|
271 |
|
|
static void *handle= NULL; /* Dynamic linker handle */ |
272 |
teddy |
1.48 |
const char *dlerr; /* Dynamic linker error */ |
273 |
|
|
char *mangled; /* Mangled function name */ |
274 |
teddy |
1.28 |
|
275 |
masse |
1.87 |
new_value= new_val(env); |
276 |
teddy |
1.28 |
|
277 |
|
|
/* The new value is a symbol */ |
278 |
|
|
new_value->type= symb; |
279 |
|
|
|
280 |
|
|
/* Look up the symbol name in the hash table */ |
281 |
teddy |
1.29 |
new_symbol= hash(env->symbols, in_string); |
282 |
|
|
new_value->content.ptr= *new_symbol; |
283 |
teddy |
1.28 |
|
284 |
teddy |
1.30 |
if(*new_symbol==NULL) { /* If symbol was undefined */ |
285 |
teddy |
1.28 |
|
286 |
|
|
/* Create a new symbol */ |
287 |
teddy |
1.30 |
(*new_symbol)= malloc(sizeof(symbol)); |
288 |
teddy |
1.29 |
(*new_symbol)->val= NULL; /* undefined value */ |
289 |
|
|
(*new_symbol)->next= NULL; |
290 |
|
|
(*new_symbol)->id= malloc(strlen(in_string)+1); |
291 |
|
|
strcpy((*new_symbol)->id, in_string); |
292 |
masse |
1.1 |
|
293 |
teddy |
1.28 |
/* Intern the new symbol in the hash table */ |
294 |
teddy |
1.29 |
new_value->content.ptr= *new_symbol; |
295 |
masse |
1.1 |
|
296 |
teddy |
1.28 |
/* Try to load the symbol name as an external function, to see if |
297 |
|
|
we should bind the symbol to a new function pointer value */ |
298 |
masse |
1.16 |
if(handle==NULL) /* If no handle */ |
299 |
teddy |
1.28 |
handle= dlopen(NULL, RTLD_LAZY); |
300 |
masse |
1.6 |
|
301 |
teddy |
1.86 |
mangled=mangle_str(in_string); /* mangle the name */ |
302 |
|
|
funcptr= dlsym(handle, mangled); /* and try to find it */ |
303 |
|
|
free(mangled); |
304 |
teddy |
1.48 |
dlerr=dlerror(); |
305 |
|
|
if(dlerr != NULL) { /* If no function was found */ |
306 |
teddy |
1.86 |
funcptr= dlsym(handle, in_string); /* Get function pointer */ |
307 |
teddy |
1.48 |
dlerr=dlerror(); |
308 |
|
|
} |
309 |
|
|
if(dlerr==NULL) { /* If a function was found */ |
310 |
masse |
1.87 |
new_fvalue= new_val(env); /* Create a new value */ |
311 |
teddy |
1.28 |
new_fvalue->type=func; /* The new value is a function pointer */ |
312 |
|
|
new_fvalue->content.ptr=funcptr; /* Store function pointer */ |
313 |
teddy |
1.29 |
(*new_symbol)->val= new_fvalue; /* Bind the symbol to the new |
314 |
|
|
function value */ |
315 |
teddy |
1.28 |
} |
316 |
masse |
1.1 |
} |
317 |
masse |
1.75 |
push_val(env, new_value); |
318 |
masse |
1.1 |
} |
319 |
|
|
|
320 |
masse |
1.14 |
/* Print newline. */ |
321 |
masse |
1.34 |
extern void nl() |
322 |
masse |
1.8 |
{ |
323 |
|
|
printf("\n"); |
324 |
|
|
} |
325 |
masse |
1.1 |
|
326 |
teddy |
1.37 |
/* Gets the type of a value */ |
327 |
|
|
extern void type(environment *env){ |
328 |
|
|
int typenum; |
329 |
|
|
|
330 |
|
|
if((env->head)==NULL) { |
331 |
|
|
printerr("Too Few Arguments"); |
332 |
|
|
env->err=1; |
333 |
|
|
return; |
334 |
|
|
} |
335 |
|
|
typenum=env->head->item->type; |
336 |
|
|
toss(env); |
337 |
|
|
switch(typenum){ |
338 |
|
|
case integer: |
339 |
|
|
push_sym(env, "integer"); |
340 |
|
|
break; |
341 |
|
|
case string: |
342 |
|
|
push_sym(env, "string"); |
343 |
|
|
break; |
344 |
|
|
case symb: |
345 |
|
|
push_sym(env, "symbol"); |
346 |
|
|
break; |
347 |
|
|
case func: |
348 |
|
|
push_sym(env, "function"); |
349 |
|
|
break; |
350 |
|
|
case list: |
351 |
|
|
push_sym(env, "list"); |
352 |
|
|
break; |
353 |
|
|
} |
354 |
|
|
} |
355 |
|
|
|
356 |
masse |
1.14 |
/* Prints the top element of the stack. */ |
357 |
teddy |
1.80 |
void print_h(stackitem *stack_head, int noquote) |
358 |
masse |
1.8 |
{ |
359 |
teddy |
1.28 |
switch(stack_head->item->type) { |
360 |
|
|
case integer: |
361 |
|
|
printf("%d", stack_head->item->content.val); |
362 |
teddy |
1.2 |
break; |
363 |
|
|
case string: |
364 |
teddy |
1.80 |
if(noquote) |
365 |
|
|
printf("%s", (char*)stack_head->item->content.ptr); |
366 |
|
|
else |
367 |
|
|
printf("\"%s\"", (char*)stack_head->item->content.ptr); |
368 |
teddy |
1.2 |
break; |
369 |
teddy |
1.28 |
case symb: |
370 |
teddy |
1.45 |
printf("%s", ((symbol *)(stack_head->item->content.ptr))->id); |
371 |
masse |
1.6 |
break; |
372 |
teddy |
1.35 |
case func: |
373 |
|
|
printf("#<function %p>", (funcp)(stack_head->item->content.ptr)); |
374 |
|
|
break; |
375 |
|
|
case list: |
376 |
teddy |
1.38 |
/* A list is just a stack, so make stack_head point to it */ |
377 |
|
|
stack_head=(stackitem *)(stack_head->item->content.ptr); |
378 |
|
|
printf("[ "); |
379 |
|
|
while(stack_head != NULL) { |
380 |
teddy |
1.80 |
print_h(stack_head, noquote); |
381 |
teddy |
1.38 |
printf(" "); |
382 |
|
|
stack_head=stack_head->next; |
383 |
|
|
} |
384 |
teddy |
1.39 |
printf("]"); |
385 |
teddy |
1.35 |
break; |
386 |
teddy |
1.2 |
} |
387 |
masse |
1.1 |
} |
388 |
|
|
|
389 |
teddy |
1.28 |
extern void print_(environment *env) { |
390 |
teddy |
1.35 |
if(env->head==NULL) { |
391 |
teddy |
1.36 |
printerr("Too Few Arguments"); |
392 |
teddy |
1.35 |
env->err=1; |
393 |
|
|
return; |
394 |
|
|
} |
395 |
teddy |
1.80 |
print_h(env->head, 0); |
396 |
|
|
nl(); |
397 |
teddy |
1.28 |
} |
398 |
|
|
|
399 |
masse |
1.14 |
/* Prints the top element of the stack and then discards it. */ |
400 |
teddy |
1.28 |
extern void print(environment *env) |
401 |
masse |
1.8 |
{ |
402 |
teddy |
1.28 |
print_(env); |
403 |
teddy |
1.35 |
if(env->err) return; |
404 |
teddy |
1.28 |
toss(env); |
405 |
masse |
1.8 |
} |
406 |
|
|
|
407 |
teddy |
1.80 |
extern void princ_(environment *env) { |
408 |
|
|
if(env->head==NULL) { |
409 |
|
|
printerr("Too Few Arguments"); |
410 |
|
|
env->err=1; |
411 |
|
|
return; |
412 |
|
|
} |
413 |
|
|
print_h(env->head, 1); |
414 |
|
|
} |
415 |
|
|
|
416 |
|
|
/* Prints the top element of the stack and then discards it. */ |
417 |
|
|
extern void princ(environment *env) |
418 |
|
|
{ |
419 |
|
|
princ_(env); |
420 |
|
|
if(env->err) return; |
421 |
|
|
toss(env); |
422 |
|
|
} |
423 |
|
|
|
424 |
masse |
1.14 |
/* Only to be called by function printstack. */ |
425 |
teddy |
1.28 |
void print_st(stackitem *stack_head, long counter) |
426 |
masse |
1.8 |
{ |
427 |
|
|
if(stack_head->next != NULL) |
428 |
|
|
print_st(stack_head->next, counter+1); |
429 |
|
|
printf("%ld: ", counter); |
430 |
teddy |
1.80 |
print_h(stack_head, 0); |
431 |
masse |
1.8 |
nl(); |
432 |
|
|
} |
433 |
|
|
|
434 |
masse |
1.14 |
/* Prints the stack. */ |
435 |
teddy |
1.28 |
extern void printstack(environment *env) |
436 |
masse |
1.1 |
{ |
437 |
teddy |
1.35 |
if(env->head == NULL) { |
438 |
teddy |
1.80 |
printf("Stack Empty\n"); |
439 |
teddy |
1.35 |
return; |
440 |
masse |
1.1 |
} |
441 |
teddy |
1.35 |
print_st(env->head, 1); |
442 |
masse |
1.1 |
} |
443 |
|
|
|
444 |
masse |
1.26 |
/* Swap the two top elements on the stack. */ |
445 |
teddy |
1.28 |
extern void swap(environment *env) |
446 |
masse |
1.26 |
{ |
447 |
teddy |
1.28 |
stackitem *temp= env->head; |
448 |
masse |
1.26 |
|
449 |
masse |
1.46 |
if(env->head==NULL || env->head->next==NULL) { |
450 |
teddy |
1.36 |
printerr("Too Few Arguments"); |
451 |
teddy |
1.35 |
env->err=1; |
452 |
masse |
1.26 |
return; |
453 |
teddy |
1.28 |
} |
454 |
masse |
1.26 |
|
455 |
teddy |
1.28 |
env->head= env->head->next; |
456 |
|
|
temp->next= env->head->next; |
457 |
|
|
env->head->next= temp; |
458 |
masse |
1.26 |
} |
459 |
|
|
|
460 |
teddy |
1.56 |
/* Rotate the first three elements on the stack. */ |
461 |
|
|
extern void rot(environment *env) |
462 |
|
|
{ |
463 |
|
|
stackitem *temp= env->head; |
464 |
|
|
|
465 |
|
|
if(env->head==NULL || env->head->next==NULL |
466 |
|
|
|| env->head->next->next==NULL) { |
467 |
|
|
printerr("Too Few Arguments"); |
468 |
|
|
env->err=1; |
469 |
|
|
return; |
470 |
|
|
} |
471 |
|
|
|
472 |
|
|
env->head= env->head->next->next; |
473 |
|
|
temp->next->next= env->head->next; |
474 |
|
|
env->head->next= temp; |
475 |
|
|
} |
476 |
|
|
|
477 |
teddy |
1.33 |
/* Recall a value from a symbol, if bound */ |
478 |
teddy |
1.31 |
extern void rcl(environment *env) |
479 |
|
|
{ |
480 |
|
|
value *val; |
481 |
|
|
|
482 |
|
|
if(env->head == NULL) { |
483 |
teddy |
1.36 |
printerr("Too Few Arguments"); |
484 |
teddy |
1.35 |
env->err=1; |
485 |
teddy |
1.31 |
return; |
486 |
|
|
} |
487 |
|
|
|
488 |
|
|
if(env->head->item->type!=symb) { |
489 |
teddy |
1.36 |
printerr("Bad Argument Type"); |
490 |
|
|
env->err=2; |
491 |
teddy |
1.31 |
return; |
492 |
|
|
} |
493 |
teddy |
1.35 |
|
494 |
teddy |
1.31 |
val=((symbol *)(env->head->item->content.ptr))->val; |
495 |
teddy |
1.33 |
if(val == NULL){ |
496 |
teddy |
1.36 |
printerr("Unbound Variable"); |
497 |
|
|
env->err=3; |
498 |
teddy |
1.33 |
return; |
499 |
|
|
} |
500 |
teddy |
1.31 |
toss(env); /* toss the symbol */ |
501 |
teddy |
1.35 |
if(env->err) return; |
502 |
masse |
1.72 |
push_val(env, val); /* Return its bound value */ |
503 |
teddy |
1.31 |
} |
504 |
masse |
1.26 |
|
505 |
teddy |
1.29 |
/* If the top element is a symbol, determine if it's bound to a |
506 |
|
|
function value, and if it is, toss the symbol and execute the |
507 |
|
|
function. */ |
508 |
teddy |
1.28 |
extern void eval(environment *env) |
509 |
masse |
1.1 |
{ |
510 |
|
|
funcp in_func; |
511 |
masse |
1.44 |
value* temp_val; |
512 |
|
|
stackitem* iterator; |
513 |
|
|
|
514 |
teddy |
1.80 |
eval_start: |
515 |
|
|
|
516 |
teddy |
1.29 |
if(env->head==NULL) { |
517 |
teddy |
1.36 |
printerr("Too Few Arguments"); |
518 |
teddy |
1.35 |
env->err=1; |
519 |
masse |
1.1 |
return; |
520 |
masse |
1.17 |
} |
521 |
masse |
1.1 |
|
522 |
masse |
1.46 |
switch(env->head->item->type) { |
523 |
|
|
/* if it's a symbol */ |
524 |
|
|
case symb: |
525 |
teddy |
1.35 |
rcl(env); /* get its contents */ |
526 |
|
|
if(env->err) return; |
527 |
|
|
if(env->head->item->type!=symb){ /* don't recurse symbols */ |
528 |
teddy |
1.64 |
goto eval_start; |
529 |
teddy |
1.29 |
} |
530 |
teddy |
1.59 |
return; |
531 |
masse |
1.22 |
|
532 |
masse |
1.46 |
/* If it's a lone function value, run it */ |
533 |
|
|
case func: |
534 |
teddy |
1.29 |
in_func= (funcp)(env->head->item->content.ptr); |
535 |
teddy |
1.28 |
toss(env); |
536 |
teddy |
1.35 |
if(env->err) return; |
537 |
teddy |
1.59 |
return (*in_func)(env); |
538 |
masse |
1.44 |
|
539 |
masse |
1.46 |
/* If it's a list */ |
540 |
|
|
case list: |
541 |
masse |
1.44 |
temp_val= env->head->item; |
542 |
|
|
toss(env); |
543 |
|
|
if(env->err) return; |
544 |
|
|
iterator= (stackitem*)temp_val->content.ptr; |
545 |
teddy |
1.59 |
while(iterator!=NULL) { |
546 |
masse |
1.72 |
push_val(env, iterator->item); |
547 |
masse |
1.44 |
if(env->head->item->type==symb |
548 |
|
|
&& strcmp(";", ((symbol*)(env->head->item->content.ptr))->id)==0) { |
549 |
|
|
toss(env); |
550 |
|
|
if(env->err) return; |
551 |
teddy |
1.59 |
if(iterator->next == NULL){ |
552 |
teddy |
1.64 |
goto eval_start; |
553 |
teddy |
1.59 |
} |
554 |
masse |
1.44 |
eval(env); |
555 |
masse |
1.46 |
if(env->err) return; |
556 |
masse |
1.44 |
} |
557 |
|
|
iterator= iterator->next; |
558 |
|
|
} |
559 |
teddy |
1.59 |
return; |
560 |
masse |
1.46 |
|
561 |
masse |
1.71 |
default: |
562 |
teddy |
1.59 |
return; |
563 |
masse |
1.26 |
} |
564 |
masse |
1.1 |
} |
565 |
|
|
|
566 |
masse |
1.44 |
/* Reverse (flip) a list */ |
567 |
teddy |
1.40 |
extern void rev(environment *env){ |
568 |
teddy |
1.78 |
stackitem *old_head, *new_head, *item; |
569 |
teddy |
1.40 |
|
570 |
|
|
if((env->head)==NULL) { |
571 |
|
|
printerr("Too Few Arguments"); |
572 |
|
|
env->err=1; |
573 |
|
|
return; |
574 |
|
|
} |
575 |
|
|
|
576 |
|
|
if(env->head->item->type!=list) { |
577 |
|
|
printerr("Bad Argument Type"); |
578 |
|
|
env->err=2; |
579 |
|
|
return; |
580 |
|
|
} |
581 |
|
|
|
582 |
teddy |
1.78 |
old_head=(stackitem *)(env->head->item->content.ptr); |
583 |
|
|
new_head=NULL; |
584 |
|
|
while(old_head != NULL){ |
585 |
|
|
item=old_head; |
586 |
|
|
old_head=old_head->next; |
587 |
|
|
item->next=new_head; |
588 |
|
|
new_head=item; |
589 |
teddy |
1.40 |
} |
590 |
teddy |
1.78 |
env->head->item->content.ptr=new_head; |
591 |
teddy |
1.40 |
} |
592 |
|
|
|
593 |
masse |
1.19 |
/* Make a list. */ |
594 |
teddy |
1.28 |
extern void pack(environment *env) |
595 |
masse |
1.19 |
{ |
596 |
teddy |
1.28 |
stackitem *iterator, *temp; |
597 |
|
|
value *pack; |
598 |
masse |
1.19 |
|
599 |
teddy |
1.28 |
iterator= env->head; |
600 |
masse |
1.19 |
|
601 |
masse |
1.73 |
if(iterator==NULL |
602 |
|
|
|| (iterator->item->type==symb |
603 |
|
|
&& ((symbol*)(iterator->item->content.ptr))->id[0]=='[')) { |
604 |
masse |
1.24 |
temp= NULL; |
605 |
teddy |
1.28 |
toss(env); |
606 |
masse |
1.24 |
} else { |
607 |
|
|
/* Search for first delimiter */ |
608 |
teddy |
1.28 |
while(iterator->next!=NULL |
609 |
masse |
1.73 |
&& (iterator->next->item->type!=symb |
610 |
|
|
|| ((symbol*)(iterator->next->item->content.ptr))->id[0]!='[')) |
611 |
masse |
1.24 |
iterator= iterator->next; |
612 |
|
|
|
613 |
|
|
/* Extract list */ |
614 |
teddy |
1.28 |
temp= env->head; |
615 |
|
|
env->head= iterator->next; |
616 |
masse |
1.24 |
iterator->next= NULL; |
617 |
|
|
|
618 |
teddy |
1.28 |
if(env->head!=NULL) |
619 |
|
|
toss(env); |
620 |
masse |
1.24 |
} |
621 |
masse |
1.19 |
|
622 |
|
|
/* Push list */ |
623 |
masse |
1.87 |
pack= new_val(env); |
624 |
masse |
1.19 |
pack->type= list; |
625 |
|
|
pack->content.ptr= temp; |
626 |
teddy |
1.28 |
|
627 |
masse |
1.74 |
push_val(env, pack); |
628 |
teddy |
1.40 |
rev(env); |
629 |
masse |
1.19 |
} |
630 |
|
|
|
631 |
masse |
1.16 |
/* Relocate elements of the list on the stack. */ |
632 |
teddy |
1.28 |
extern void expand(environment *env) |
633 |
masse |
1.1 |
{ |
634 |
masse |
1.8 |
stackitem *temp, *new_head; |
635 |
|
|
|
636 |
masse |
1.16 |
/* Is top element a list? */ |
637 |
teddy |
1.36 |
if(env->head==NULL) { |
638 |
|
|
printerr("Too Few Arguments"); |
639 |
teddy |
1.35 |
env->err=1; |
640 |
masse |
1.8 |
return; |
641 |
masse |
1.17 |
} |
642 |
teddy |
1.36 |
if(env->head->item->type!=list) { |
643 |
|
|
printerr("Bad Argument Type"); |
644 |
|
|
env->err=2; |
645 |
|
|
return; |
646 |
|
|
} |
647 |
masse |
1.43 |
|
648 |
|
|
rev(env); |
649 |
|
|
|
650 |
|
|
if(env->err) |
651 |
|
|
return; |
652 |
masse |
1.8 |
|
653 |
masse |
1.16 |
/* The first list element is the new stack head */ |
654 |
teddy |
1.28 |
new_head= temp= env->head->item->content.ptr; |
655 |
masse |
1.8 |
|
656 |
teddy |
1.28 |
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 |
|
|
|
742 |
|
|
/* Bind the symbol to the value */ |
743 |
|
|
sym->val= env->head->next->item; |
744 |
masse |
1.12 |
|
745 |
teddy |
1.28 |
toss(env); toss(env); |
746 |
masse |
1.12 |
} |
747 |
masse |
1.10 |
|
748 |
masse |
1.14 |
/* Quit stack. */ |
749 |
teddy |
1.28 |
extern void quit(environment *env) |
750 |
teddy |
1.5 |
{ |
751 |
teddy |
1.77 |
long i; |
752 |
|
|
|
753 |
|
|
clear(env); |
754 |
masse |
1.83 |
|
755 |
teddy |
1.77 |
if (env->err) return; |
756 |
|
|
for(i= 0; i<HASHTBLSIZE; i++) { |
757 |
masse |
1.79 |
while(env->symbols[i]!= NULL) { |
758 |
teddy |
1.77 |
forget_sym(&(env->symbols[i])); |
759 |
|
|
} |
760 |
teddy |
1.80 |
env->symbols[i]= NULL; |
761 |
teddy |
1.77 |
} |
762 |
masse |
1.83 |
|
763 |
masse |
1.87 |
gc_init(env); |
764 |
|
|
|
765 |
masse |
1.83 |
if(env->free_string!=NULL) |
766 |
|
|
free(env->free_string); |
767 |
|
|
|
768 |
|
|
muntrace(); |
769 |
|
|
|
770 |
teddy |
1.5 |
exit(EXIT_SUCCESS); |
771 |
masse |
1.24 |
} |
772 |
|
|
|
773 |
|
|
/* Clear stack */ |
774 |
teddy |
1.28 |
extern void clear(environment *env) |
775 |
masse |
1.24 |
{ |
776 |
teddy |
1.28 |
while(env->head!=NULL) |
777 |
|
|
toss(env); |
778 |
masse |
1.1 |
} |
779 |
|
|
|
780 |
teddy |
1.33 |
/* List all defined words */ |
781 |
masse |
1.32 |
extern void words(environment *env) |
782 |
|
|
{ |
783 |
|
|
symbol *temp; |
784 |
|
|
int i; |
785 |
|
|
|
786 |
|
|
for(i= 0; i<HASHTBLSIZE; i++) { |
787 |
|
|
temp= env->symbols[i]; |
788 |
|
|
while(temp!=NULL) { |
789 |
|
|
printf("%s\n", temp->id); |
790 |
|
|
temp= temp->next; |
791 |
|
|
} |
792 |
|
|
} |
793 |
|
|
} |
794 |
masse |
1.34 |
|
795 |
teddy |
1.77 |
/* Internal forget function */ |
796 |
|
|
void forget_sym(symbol **hash_entry) { |
797 |
|
|
symbol *temp; |
798 |
|
|
|
799 |
|
|
temp= *hash_entry; |
800 |
|
|
*hash_entry= (*hash_entry)->next; |
801 |
|
|
|
802 |
|
|
free(temp->id); |
803 |
|
|
free(temp); |
804 |
|
|
} |
805 |
|
|
|
806 |
masse |
1.34 |
/* Forgets a symbol (remove it from the hash table) */ |
807 |
|
|
extern void forget(environment *env) |
808 |
|
|
{ |
809 |
|
|
char* sym_id; |
810 |
|
|
stackitem *stack_head= env->head; |
811 |
|
|
|
812 |
teddy |
1.36 |
if(stack_head==NULL) { |
813 |
|
|
printerr("Too Few Arguments"); |
814 |
|
|
env->err=1; |
815 |
|
|
return; |
816 |
|
|
} |
817 |
|
|
|
818 |
|
|
if(stack_head->item->type!=symb) { |
819 |
|
|
printerr("Bad Argument Type"); |
820 |
|
|
env->err=2; |
821 |
masse |
1.34 |
return; |
822 |
|
|
} |
823 |
|
|
|
824 |
|
|
sym_id= ((symbol*)(stack_head->item->content.ptr))->id; |
825 |
|
|
toss(env); |
826 |
|
|
|
827 |
teddy |
1.77 |
return forget_sym(hash(env->symbols, sym_id)); |
828 |
teddy |
1.36 |
} |
829 |
|
|
|
830 |
|
|
/* Returns the current error number to the stack */ |
831 |
|
|
extern void errn(environment *env){ |
832 |
masse |
1.72 |
push_int(env, env->err); |
833 |
teddy |
1.36 |
} |
834 |
masse |
1.69 |
|
835 |
teddy |
1.84 |
int main(int argc, char **argv) |
836 |
masse |
1.1 |
{ |
837 |
teddy |
1.28 |
environment myenv; |
838 |
masse |
1.1 |
|
839 |
teddy |
1.84 |
int c; /* getopt option character */ |
840 |
|
|
|
841 |
masse |
1.83 |
mtrace(); |
842 |
|
|
|
843 |
teddy |
1.28 |
init_env(&myenv); |
844 |
masse |
1.1 |
|
845 |
teddy |
1.84 |
myenv.interactive = isatty(STDIN_FILENO) && isatty(STDOUT_FILENO); |
846 |
|
|
|
847 |
|
|
while ((c = getopt (argc, argv, "i")) != -1) |
848 |
|
|
switch (c) |
849 |
|
|
{ |
850 |
|
|
case 'i': |
851 |
|
|
myenv.interactive = 1; |
852 |
|
|
break; |
853 |
|
|
case '?': |
854 |
|
|
fprintf (stderr, |
855 |
|
|
"Unknown option character `\\x%x'.\n", |
856 |
|
|
optopt); |
857 |
|
|
return EX_USAGE; |
858 |
|
|
default: |
859 |
|
|
abort (); |
860 |
|
|
} |
861 |
|
|
|
862 |
|
|
if (optind < argc) { |
863 |
|
|
myenv.interactive = 0; |
864 |
|
|
myenv.inputstream= fopen(argv[optind], "r"); |
865 |
|
|
if(myenv.inputstream== NULL) { |
866 |
|
|
perror(argv[0]); |
867 |
|
|
exit (EX_NOINPUT); |
868 |
|
|
} |
869 |
|
|
} |
870 |
|
|
|
871 |
masse |
1.69 |
while(1) { |
872 |
teddy |
1.85 |
if(myenv.in_string==NULL) { |
873 |
|
|
if (myenv.interactive) { |
874 |
|
|
if(myenv.err) { |
875 |
|
|
printf("(error %d)\n", myenv.err); |
876 |
|
|
} |
877 |
|
|
nl(); |
878 |
|
|
printstack(&myenv); |
879 |
|
|
printf("> "); |
880 |
|
|
} |
881 |
|
|
myenv.err=0; |
882 |
teddy |
1.80 |
} |
883 |
teddy |
1.84 |
sx_72656164(&myenv); |
884 |
teddy |
1.85 |
if (myenv.err==4) { |
885 |
|
|
return EX_NOINPUT; |
886 |
masse |
1.71 |
} else if(myenv.head!=NULL |
887 |
|
|
&& myenv.head->item->type==symb |
888 |
masse |
1.69 |
&& ((symbol*)(myenv.head->item->content.ptr))->id[0]==';') { |
889 |
|
|
toss(&myenv); /* No error check in main */ |
890 |
|
|
eval(&myenv); |
891 |
teddy |
1.35 |
} |
892 |
masse |
1.1 |
} |
893 |
teddy |
1.41 |
quit(&myenv); |
894 |
teddy |
1.42 |
return EXIT_FAILURE; |
895 |
teddy |
1.48 |
} |
896 |
|
|
|
897 |
teddy |
1.85 |
/* "+" */ |
898 |
teddy |
1.48 |
extern void sx_2b(environment *env) { |
899 |
|
|
int a, b; |
900 |
masse |
1.49 |
size_t len; |
901 |
|
|
char* new_string; |
902 |
|
|
value *a_val, *b_val; |
903 |
teddy |
1.48 |
|
904 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
905 |
|
|
printerr("Too Few Arguments"); |
906 |
|
|
env->err=1; |
907 |
masse |
1.49 |
return; |
908 |
|
|
} |
909 |
|
|
|
910 |
|
|
if(env->head->item->type==string |
911 |
|
|
&& env->head->next->item->type==string) { |
912 |
|
|
a_val= env->head->item; |
913 |
|
|
b_val= env->head->next->item; |
914 |
|
|
toss(env); if(env->err) return; |
915 |
|
|
toss(env); if(env->err) return; |
916 |
|
|
len= strlen(a_val->content.ptr)+strlen(b_val->content.ptr)+1; |
917 |
|
|
new_string= malloc(len); |
918 |
|
|
strcpy(new_string, b_val->content.ptr); |
919 |
|
|
strcat(new_string, a_val->content.ptr); |
920 |
masse |
1.72 |
push_cstring(env, new_string); |
921 |
masse |
1.49 |
free(new_string); |
922 |
teddy |
1.48 |
return; |
923 |
|
|
} |
924 |
|
|
|
925 |
|
|
if(env->head->item->type!=integer |
926 |
|
|
|| env->head->next->item->type!=integer) { |
927 |
|
|
printerr("Bad Argument Type"); |
928 |
|
|
env->err=2; |
929 |
|
|
return; |
930 |
|
|
} |
931 |
|
|
a=env->head->item->content.val; |
932 |
masse |
1.87 |
toss(env); if(env->err) return; |
933 |
|
|
|
934 |
|
|
b=env->head->item->content.val; |
935 |
|
|
toss(env); if(env->err) return; |
936 |
|
|
push_int(env, a+b); |
937 |
masse |
1.1 |
} |
938 |
teddy |
1.55 |
|
939 |
teddy |
1.85 |
/* "-" */ |
940 |
teddy |
1.60 |
extern void sx_2d(environment *env) { |
941 |
teddy |
1.62 |
int a, b; |
942 |
teddy |
1.60 |
|
943 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
944 |
|
|
printerr("Too Few Arguments"); |
945 |
|
|
env->err=1; |
946 |
|
|
return; |
947 |
|
|
} |
948 |
|
|
|
949 |
|
|
if(env->head->item->type!=integer |
950 |
|
|
|| env->head->next->item->type!=integer) { |
951 |
|
|
printerr("Bad Argument Type"); |
952 |
|
|
env->err=2; |
953 |
|
|
return; |
954 |
|
|
} |
955 |
|
|
a=env->head->item->content.val; |
956 |
masse |
1.87 |
toss(env); if(env->err) return; |
957 |
|
|
b=env->head->item->content.val; |
958 |
|
|
toss(env); if(env->err) return; |
959 |
|
|
push_int(env, b-a); |
960 |
teddy |
1.60 |
} |
961 |
|
|
|
962 |
teddy |
1.85 |
/* ">" */ |
963 |
teddy |
1.61 |
extern void sx_3e(environment *env) { |
964 |
teddy |
1.62 |
int a, b; |
965 |
teddy |
1.61 |
|
966 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
967 |
|
|
printerr("Too Few Arguments"); |
968 |
|
|
env->err=1; |
969 |
|
|
return; |
970 |
|
|
} |
971 |
|
|
|
972 |
|
|
if(env->head->item->type!=integer |
973 |
|
|
|| env->head->next->item->type!=integer) { |
974 |
|
|
printerr("Bad Argument Type"); |
975 |
|
|
env->err=2; |
976 |
|
|
return; |
977 |
|
|
} |
978 |
|
|
a=env->head->item->content.val; |
979 |
masse |
1.87 |
toss(env); if(env->err) return; |
980 |
|
|
b=env->head->item->content.val; |
981 |
|
|
toss(env); if(env->err) return; |
982 |
|
|
push_int(env, b>a); |
983 |
teddy |
1.61 |
} |
984 |
|
|
|
985 |
teddy |
1.55 |
/* Return copy of a value */ |
986 |
masse |
1.87 |
value *copy_val(environment *env, value *old_value){ |
987 |
teddy |
1.55 |
stackitem *old_item, *new_item, *prev_item; |
988 |
|
|
|
989 |
masse |
1.87 |
value *new_value=new_val(env); |
990 |
teddy |
1.55 |
|
991 |
|
|
new_value->type=old_value->type; |
992 |
masse |
1.87 |
|
993 |
teddy |
1.55 |
switch(old_value->type){ |
994 |
|
|
case integer: |
995 |
|
|
new_value->content.val=old_value->content.val; |
996 |
|
|
break; |
997 |
|
|
case string: |
998 |
|
|
(char *)(new_value->content.ptr) |
999 |
|
|
= strdup((char *)(old_value->content.ptr)); |
1000 |
|
|
break; |
1001 |
|
|
case func: |
1002 |
|
|
case symb: |
1003 |
|
|
new_value->content.ptr=old_value->content.ptr; |
1004 |
|
|
break; |
1005 |
|
|
case list: |
1006 |
|
|
new_value->content.ptr=NULL; |
1007 |
|
|
|
1008 |
|
|
prev_item=NULL; |
1009 |
|
|
old_item=(stackitem *)(old_value->content.ptr); |
1010 |
|
|
|
1011 |
|
|
while(old_item != NULL) { /* While list is not empty */ |
1012 |
|
|
new_item= malloc(sizeof(stackitem)); |
1013 |
masse |
1.87 |
new_item->item=copy_val(env, old_item->item); /* recurse */ |
1014 |
teddy |
1.55 |
new_item->next=NULL; |
1015 |
|
|
if(prev_item != NULL) /* If this wasn't the first item */ |
1016 |
|
|
prev_item->next=new_item; /* point the previous item to the |
1017 |
|
|
new item */ |
1018 |
|
|
else |
1019 |
|
|
new_value->content.ptr=new_item; |
1020 |
|
|
old_item=old_item->next; |
1021 |
|
|
prev_item=new_item; |
1022 |
|
|
} |
1023 |
|
|
break; |
1024 |
|
|
} |
1025 |
|
|
return new_value; |
1026 |
|
|
} |
1027 |
|
|
|
1028 |
teddy |
1.84 |
/* "dup"; duplicates an item on the stack */ |
1029 |
|
|
extern void sx_647570(environment *env) { |
1030 |
teddy |
1.55 |
if((env->head)==NULL) { |
1031 |
|
|
printerr("Too Few Arguments"); |
1032 |
|
|
env->err=1; |
1033 |
|
|
return; |
1034 |
|
|
} |
1035 |
masse |
1.87 |
push_val(env, copy_val(env, env->head->item)); |
1036 |
teddy |
1.55 |
} |
1037 |
teddy |
1.56 |
|
1038 |
teddy |
1.59 |
/* "if", If-Then */ |
1039 |
masse |
1.57 |
extern void sx_6966(environment *env) { |
1040 |
teddy |
1.56 |
|
1041 |
|
|
int truth; |
1042 |
|
|
|
1043 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
1044 |
|
|
printerr("Too Few Arguments"); |
1045 |
|
|
env->err=1; |
1046 |
|
|
return; |
1047 |
|
|
} |
1048 |
|
|
|
1049 |
|
|
if(env->head->next->item->type != integer) { |
1050 |
|
|
printerr("Bad Argument Type"); |
1051 |
|
|
env->err=2; |
1052 |
|
|
return; |
1053 |
|
|
} |
1054 |
|
|
|
1055 |
|
|
swap(env); |
1056 |
|
|
if(env->err) return; |
1057 |
|
|
|
1058 |
|
|
truth=env->head->item->content.val; |
1059 |
|
|
|
1060 |
|
|
toss(env); |
1061 |
|
|
if(env->err) return; |
1062 |
|
|
|
1063 |
|
|
if(truth) |
1064 |
|
|
eval(env); |
1065 |
|
|
else |
1066 |
|
|
toss(env); |
1067 |
|
|
} |
1068 |
|
|
|
1069 |
|
|
/* If-Then-Else */ |
1070 |
masse |
1.57 |
extern void ifelse(environment *env) { |
1071 |
teddy |
1.56 |
|
1072 |
|
|
int truth; |
1073 |
|
|
|
1074 |
|
|
if((env->head)==NULL || env->head->next==NULL |
1075 |
|
|
|| env->head->next->next==NULL) { |
1076 |
|
|
printerr("Too Few Arguments"); |
1077 |
|
|
env->err=1; |
1078 |
|
|
return; |
1079 |
|
|
} |
1080 |
|
|
|
1081 |
|
|
if(env->head->next->next->item->type != integer) { |
1082 |
|
|
printerr("Bad Argument Type"); |
1083 |
|
|
env->err=2; |
1084 |
|
|
return; |
1085 |
|
|
} |
1086 |
|
|
|
1087 |
|
|
rot(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 |
|
|
swap(env); |
1097 |
|
|
if(env->err) return; |
1098 |
|
|
|
1099 |
|
|
toss(env); |
1100 |
|
|
if(env->err) return; |
1101 |
|
|
|
1102 |
|
|
eval(env); |
1103 |
masse |
1.58 |
} |
1104 |
|
|
|
1105 |
teddy |
1.85 |
/* "while" */ |
1106 |
masse |
1.58 |
extern void sx_7768696c65(environment *env) { |
1107 |
|
|
|
1108 |
|
|
int truth; |
1109 |
masse |
1.63 |
value *loop, *test; |
1110 |
masse |
1.58 |
|
1111 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
1112 |
|
|
printerr("Too Few Arguments"); |
1113 |
|
|
env->err=1; |
1114 |
|
|
return; |
1115 |
|
|
} |
1116 |
|
|
|
1117 |
masse |
1.63 |
loop= env->head->item; |
1118 |
|
|
toss(env); if(env->err) return; |
1119 |
|
|
|
1120 |
|
|
test= env->head->item; |
1121 |
|
|
toss(env); if(env->err) return; |
1122 |
|
|
|
1123 |
masse |
1.58 |
do { |
1124 |
masse |
1.72 |
push_val(env, test); |
1125 |
masse |
1.63 |
eval(env); |
1126 |
masse |
1.58 |
|
1127 |
|
|
if(env->head->item->type != integer) { |
1128 |
|
|
printerr("Bad Argument Type"); |
1129 |
|
|
env->err=2; |
1130 |
|
|
return; |
1131 |
|
|
} |
1132 |
|
|
|
1133 |
|
|
truth= env->head->item->content.val; |
1134 |
|
|
toss(env); if(env->err) return; |
1135 |
|
|
|
1136 |
|
|
if(truth) { |
1137 |
masse |
1.72 |
push_val(env, loop); |
1138 |
masse |
1.58 |
eval(env); |
1139 |
|
|
} else { |
1140 |
|
|
toss(env); |
1141 |
|
|
} |
1142 |
|
|
|
1143 |
|
|
} while(truth); |
1144 |
teddy |
1.56 |
} |
1145 |
masse |
1.65 |
|
1146 |
teddy |
1.84 |
/* "for"; For-loop */ |
1147 |
masse |
1.65 |
extern void sx_666f72(environment *env) { |
1148 |
|
|
|
1149 |
|
|
value *loop, *foo; |
1150 |
|
|
stackitem *iterator; |
1151 |
|
|
|
1152 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
1153 |
|
|
printerr("Too Few Arguments"); |
1154 |
|
|
env->err=1; |
1155 |
|
|
return; |
1156 |
|
|
} |
1157 |
|
|
|
1158 |
|
|
if(env->head->next->item->type != list) { |
1159 |
|
|
printerr("Bad Argument Type"); |
1160 |
|
|
env->err=2; |
1161 |
|
|
return; |
1162 |
|
|
} |
1163 |
|
|
|
1164 |
|
|
loop= env->head->item; |
1165 |
|
|
toss(env); if(env->err) return; |
1166 |
|
|
|
1167 |
|
|
foo= env->head->item; |
1168 |
|
|
toss(env); if(env->err) return; |
1169 |
|
|
|
1170 |
|
|
iterator= foo->content.ptr; |
1171 |
|
|
|
1172 |
|
|
while(iterator!=NULL) { |
1173 |
masse |
1.72 |
push_val(env, iterator->item); |
1174 |
|
|
push_val(env, loop); |
1175 |
masse |
1.65 |
eval(env); if(env->err) return; |
1176 |
|
|
iterator= iterator->next; |
1177 |
|
|
} |
1178 |
|
|
} |
1179 |
masse |
1.66 |
|
1180 |
teddy |
1.85 |
/* "to" */ |
1181 |
masse |
1.66 |
extern void to(environment *env) { |
1182 |
|
|
int i, start, ending; |
1183 |
masse |
1.74 |
stackitem *temp_head; |
1184 |
|
|
value *temp_val; |
1185 |
masse |
1.66 |
|
1186 |
|
|
if((env->head)==NULL || env->head->next==NULL) { |
1187 |
|
|
printerr("Too Few Arguments"); |
1188 |
|
|
env->err=1; |
1189 |
|
|
return; |
1190 |
|
|
} |
1191 |
|
|
|
1192 |
|
|
if(env->head->item->type!=integer |
1193 |
|
|
|| env->head->next->item->type!=integer) { |
1194 |
|
|
printerr("Bad Argument Type"); |
1195 |
|
|
env->err=2; |
1196 |
|
|
return; |
1197 |
|
|
} |
1198 |
|
|
|
1199 |
|
|
ending= env->head->item->content.val; |
1200 |
|
|
toss(env); if(env->err) return; |
1201 |
|
|
start= env->head->item->content.val; |
1202 |
|
|
toss(env); if(env->err) return; |
1203 |
|
|
|
1204 |
masse |
1.74 |
temp_head= env->head; |
1205 |
|
|
env->head= NULL; |
1206 |
masse |
1.66 |
|
1207 |
masse |
1.67 |
if(ending>=start) { |
1208 |
masse |
1.74 |
for(i= ending; i>=start; i--) |
1209 |
masse |
1.72 |
push_int(env, i); |
1210 |
masse |
1.67 |
} else { |
1211 |
masse |
1.74 |
for(i= ending; i<=start; i++) |
1212 |
masse |
1.72 |
push_int(env, i); |
1213 |
masse |
1.67 |
} |
1214 |
masse |
1.66 |
|
1215 |
masse |
1.87 |
temp_val= new_val(env); |
1216 |
masse |
1.74 |
temp_val->content.ptr= env->head; |
1217 |
|
|
temp_val->type= list; |
1218 |
|
|
env->head= temp_head; |
1219 |
|
|
push_val(env, temp_val); |
1220 |
masse |
1.66 |
} |
1221 |
masse |
1.68 |
|
1222 |
|
|
/* Read a string */ |
1223 |
|
|
extern void readline(environment *env) { |
1224 |
|
|
char in_string[101]; |
1225 |
|
|
|
1226 |
teddy |
1.84 |
if(fgets(in_string, 100, env->inputstream)==NULL) |
1227 |
|
|
push_cstring(env, ""); |
1228 |
|
|
else |
1229 |
|
|
push_cstring(env, in_string); |
1230 |
masse |
1.68 |
} |
1231 |
|
|
|
1232 |
teddy |
1.84 |
/* "read"; Read a value and place on stack */ |
1233 |
|
|
extern void sx_72656164(environment *env) { |
1234 |
teddy |
1.78 |
const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%n"; |
1235 |
|
|
const char strform[]= "\"%[^\"]\"%n"; |
1236 |
|
|
const char intform[]= "%i%n"; |
1237 |
|
|
const char blankform[]= "%*[ \t]%n"; |
1238 |
|
|
const char ebrackform[]= "%*1[]]%n"; |
1239 |
|
|
const char semicform[]= "%*1[;]%n"; |
1240 |
|
|
const char bbrackform[]= "%*1[[]%n"; |
1241 |
masse |
1.68 |
|
1242 |
teddy |
1.78 |
int itemp, readlength= -1; |
1243 |
masse |
1.68 |
static int depth= 0; |
1244 |
masse |
1.83 |
char *match; |
1245 |
masse |
1.68 |
size_t inlength; |
1246 |
|
|
|
1247 |
masse |
1.70 |
if(env->in_string==NULL) { |
1248 |
teddy |
1.84 |
if(depth > 0 && env->interactive) { |
1249 |
teddy |
1.80 |
printf("]> "); |
1250 |
|
|
} |
1251 |
masse |
1.68 |
readline(env); if(env->err) return; |
1252 |
teddy |
1.84 |
|
1253 |
|
|
if(((char *)(env->head->item->content.ptr))[0]=='\0'){ |
1254 |
teddy |
1.85 |
env->err= 4; /* "" means EOF */ |
1255 |
teddy |
1.84 |
return; |
1256 |
|
|
} |
1257 |
masse |
1.68 |
|
1258 |
masse |
1.70 |
env->in_string= malloc(strlen(env->head->item->content.ptr)+1); |
1259 |
teddy |
1.78 |
env->free_string= env->in_string; /* Save the original pointer */ |
1260 |
masse |
1.70 |
strcpy(env->in_string, env->head->item->content.ptr); |
1261 |
masse |
1.68 |
toss(env); if(env->err) return; |
1262 |
|
|
} |
1263 |
|
|
|
1264 |
masse |
1.70 |
inlength= strlen(env->in_string)+1; |
1265 |
masse |
1.68 |
match= malloc(inlength); |
1266 |
|
|
|
1267 |
teddy |
1.78 |
if(sscanf(env->in_string, blankform, &readlength)!=EOF |
1268 |
|
|
&& readlength != -1) { |
1269 |
masse |
1.71 |
; |
1270 |
teddy |
1.78 |
} else if(sscanf(env->in_string, intform, &itemp, &readlength) != EOF |
1271 |
|
|
&& readlength != -1) { |
1272 |
masse |
1.72 |
push_int(env, itemp); |
1273 |
teddy |
1.78 |
} else if(sscanf(env->in_string, strform, match, &readlength) != EOF |
1274 |
|
|
&& readlength != -1) { |
1275 |
masse |
1.72 |
push_cstring(env, match); |
1276 |
teddy |
1.78 |
} else if(sscanf(env->in_string, symbform, match, &readlength) != EOF |
1277 |
|
|
&& readlength != -1) { |
1278 |
masse |
1.68 |
push_sym(env, match); |
1279 |
teddy |
1.78 |
} else if(sscanf(env->in_string, ebrackform, &readlength) != EOF |
1280 |
|
|
&& readlength != -1) { |
1281 |
masse |
1.68 |
pack(env); if(env->err) return; |
1282 |
teddy |
1.78 |
if(depth != 0) depth--; |
1283 |
|
|
} else if(sscanf(env->in_string, semicform, &readlength) != EOF |
1284 |
|
|
&& readlength != -1) { |
1285 |
masse |
1.68 |
push_sym(env, ";"); |
1286 |
teddy |
1.78 |
} else if(sscanf(env->in_string, bbrackform, &readlength) != EOF |
1287 |
|
|
&& readlength != -1) { |
1288 |
masse |
1.68 |
push_sym(env, "["); |
1289 |
|
|
depth++; |
1290 |
|
|
} else { |
1291 |
teddy |
1.78 |
free(env->free_string); |
1292 |
|
|
env->in_string = env->free_string = NULL; |
1293 |
|
|
} |
1294 |
|
|
if ( env->in_string != NULL) { |
1295 |
|
|
env->in_string += readlength; |
1296 |
masse |
1.68 |
} |
1297 |
masse |
1.83 |
|
1298 |
|
|
free(match); |
1299 |
masse |
1.68 |
|
1300 |
masse |
1.71 |
if(depth) |
1301 |
teddy |
1.84 |
return sx_72656164(env); |
1302 |
masse |
1.68 |
} |