1 |
/* printf */ |
/* printf, sscanf, fgets, fprintf, fopen, perror */ |
2 |
#include <stdio.h> |
#include <stdio.h> |
3 |
/* EXIT_SUCCESS */ |
/* exit, EXIT_SUCCESS, malloc, free */ |
4 |
#include <stdlib.h> |
#include <stdlib.h> |
5 |
/* NULL */ |
/* NULL */ |
6 |
#include <stddef.h> |
#include <stddef.h> |
7 |
/* dlopen, dlsym, dlerror */ |
/* dlopen, dlsym, dlerror */ |
8 |
#include <dlfcn.h> |
#include <dlfcn.h> |
9 |
/* assert */ |
/* strcmp, strcpy, strlen, strcat, strdup */ |
10 |
#include <assert.h> |
#include <string.h> |
11 |
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/* 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 |
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/* mtrace, muntrace */ |
16 |
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#include <mcheck.h> |
17 |
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|
18 |
#define HASHTBLSIZE 65536 |
#define HASHTBLSIZE 2048 |
19 |
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|
20 |
/* First, define some types. */ |
/* First, define some types. */ |
21 |
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|
34 |
int val; /* ...or an integer */ |
int val; /* ...or an integer */ |
35 |
} content; /* Stores a pointer or an integer */ |
} content; /* Stores a pointer or an integer */ |
36 |
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37 |
int refcount; /* Reference counter */ |
int gc_garb; |
38 |
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|
39 |
} value; |
} value; |
40 |
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54 |
typedef struct stackitem_struct |
typedef struct stackitem_struct |
55 |
{ |
{ |
56 |
value *item; /* The value on the stack */ |
value *item; /* The value on the stack */ |
57 |
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/* (This is never NULL) */ |
58 |
struct stackitem_struct *next; /* Next item */ |
struct stackitem_struct *next; /* Next item */ |
59 |
} stackitem; |
} stackitem; |
60 |
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|
61 |
/* An environment; gives access to the stack and a hash table of |
/* An environment; gives access to the stack and a hash table of |
62 |
defined symbols */ |
defined symbols */ |
63 |
typedef struct { |
typedef struct { |
64 |
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stackitem *gc_ref; |
65 |
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int gc_limit, gc_count; |
66 |
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|
67 |
stackitem *head; /* Head of the stack */ |
stackitem *head; /* Head of the stack */ |
68 |
hashtbl symbols; /* Hash table of all variable bindings */ |
hashtbl symbols; /* Hash table of all variable bindings */ |
69 |
int err; /* Error flag */ |
int err; /* Error flag */ |
70 |
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char *in_string; /* Input pending to be read */ |
71 |
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char *free_string; /* Free this string when all input is |
72 |
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read from in_string */ |
73 |
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FILE *inputstream; /* stdin or a file, most likely */ |
74 |
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int interactive; /* print prompts, stack, etc */ |
75 |
} environment; |
} environment; |
76 |
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|
77 |
/* A type for pointers to external functions */ |
/* A type for pointers to external functions */ |
81 |
/* Initialize a newly created environment */ |
/* Initialize a newly created environment */ |
82 |
void init_env(environment *env) |
void init_env(environment *env) |
83 |
{ |
{ |
84 |
long i; |
int i; |
85 |
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86 |
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env->gc_limit= 20; |
87 |
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env->gc_count= 0; |
88 |
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89 |
env->err=0; |
env->head= NULL; |
90 |
for(i= 0; i<HASHTBLSIZE; i++) |
for(i= 0; i<HASHTBLSIZE; i++) |
91 |
env->symbols[i]= NULL; |
env->symbols[i]= NULL; |
92 |
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env->err= 0; |
93 |
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env->in_string= NULL; |
94 |
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env->free_string= NULL; |
95 |
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env->inputstream= stdin; |
96 |
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env->interactive= 1; |
97 |
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} |
98 |
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99 |
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void printerr(const char* in_string) { |
100 |
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fprintf(stderr, "Err: %s\n", in_string); |
101 |
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} |
102 |
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103 |
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/* Discard the top element of the stack. */ |
104 |
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extern void toss(environment *env) |
105 |
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{ |
106 |
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stackitem *temp= env->head; |
107 |
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108 |
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if((env->head)==NULL) { |
109 |
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printerr("Too Few Arguments"); |
110 |
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env->err=1; |
111 |
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return; |
112 |
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} |
113 |
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114 |
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env->head= env->head->next; /* Remove the top stack item */ |
115 |
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free(temp); /* Free the old top stack item */ |
116 |
} |
} |
117 |
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118 |
/* Returns a pointer to a pointer to an element in the hash table. */ |
/* Returns a pointer to a pointer to an element in the hash table. */ |
119 |
symbol **hash(hashtbl in_hashtbl, const char *in_string) |
symbol **hash(hashtbl in_hashtbl, const char *in_string) |
120 |
{ |
{ |
121 |
long i= 0; |
int i= 0; |
122 |
unsigned long out_hash= 0; |
unsigned int out_hash= 0; |
123 |
char key= '\0'; |
char key= '\0'; |
124 |
symbol **position; |
symbol **position; |
125 |
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|
144 |
} |
} |
145 |
} |
} |
146 |
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147 |
/* Generic push function. */ |
extern void gc_init(environment*); |
148 |
void push(stackitem** stack_head, stackitem* in_item) |
|
149 |
{ |
value* new_val(environment *env) { |
150 |
in_item->next= *stack_head; |
value *nval= malloc(sizeof(value)); |
151 |
*stack_head= in_item; |
stackitem *nitem= malloc(sizeof(stackitem)); |
152 |
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153 |
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if(env->gc_count >= env->gc_limit) |
154 |
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gc_init(env); |
155 |
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156 |
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nval->content.ptr= NULL; |
157 |
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158 |
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nitem->item= nval; |
159 |
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nitem->next= env->gc_ref; |
160 |
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env->gc_ref= nitem; |
161 |
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162 |
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env->gc_count++; |
163 |
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164 |
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return nval; |
165 |
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} |
166 |
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167 |
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void gc_mark(value *val) { |
168 |
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stackitem *iterator; |
169 |
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170 |
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if(val==NULL || val->gc_garb==0) |
171 |
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return; |
172 |
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173 |
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val->gc_garb= 0; |
174 |
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175 |
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if(val->type==list) { |
176 |
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iterator= val->content.ptr; |
177 |
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178 |
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while(iterator!=NULL) { |
179 |
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gc_mark(iterator->item); |
180 |
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iterator= iterator->next; |
181 |
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} |
182 |
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} |
183 |
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} |
184 |
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185 |
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extern void gc_init(environment *env) { |
186 |
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stackitem *new_head= NULL, *titem, *iterator= env->gc_ref; |
187 |
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symbol *tsymb; |
188 |
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int i; |
189 |
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190 |
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while(iterator!=NULL) { |
191 |
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iterator->item->gc_garb= 1; |
192 |
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iterator= iterator->next; |
193 |
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} |
194 |
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195 |
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/* Mark */ |
196 |
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iterator= env->head; |
197 |
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while(iterator!=NULL) { |
198 |
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gc_mark(iterator->item); |
199 |
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iterator= iterator->next; |
200 |
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} |
201 |
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202 |
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for(i= 0; i<HASHTBLSIZE; i++) { |
203 |
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tsymb= env->symbols[i]; |
204 |
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while(tsymb!=NULL) { |
205 |
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gc_mark(tsymb->val); |
206 |
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tsymb= tsymb->next; |
207 |
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} |
208 |
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} |
209 |
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210 |
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env->gc_count= 0; |
211 |
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212 |
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/* Sweep */ |
213 |
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while(env->gc_ref!=NULL) { |
214 |
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if(env->gc_ref->item->gc_garb) { |
215 |
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switch(env->gc_ref->item->type) { |
216 |
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case string: |
217 |
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free(env->gc_ref->item->content.ptr); |
218 |
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break; |
219 |
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case integer: |
220 |
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break; |
221 |
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case list: |
222 |
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while(env->gc_ref->item->content.ptr!=NULL) { |
223 |
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titem= env->gc_ref->item->content.ptr; |
224 |
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env->gc_ref->item->content.ptr= titem->next; |
225 |
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free(titem); |
226 |
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} |
227 |
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break; |
228 |
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default: |
229 |
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break; |
230 |
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} |
231 |
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free(env->gc_ref->item); |
232 |
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titem= env->gc_ref->next; |
233 |
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free(env->gc_ref); |
234 |
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env->gc_ref= titem; |
235 |
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} else { |
236 |
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titem= env->gc_ref->next; |
237 |
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env->gc_ref->next= new_head; |
238 |
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new_head= env->gc_ref; |
239 |
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env->gc_ref= titem; |
240 |
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env->gc_count++; |
241 |
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} |
242 |
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} |
243 |
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244 |
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env->gc_limit= env->gc_count+20; |
245 |
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env->gc_ref= new_head; |
246 |
} |
} |
247 |
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|
248 |
/* Push a value onto the stack */ |
/* Push a value onto the stack */ |
249 |
void push_val(stackitem **stack_head, value *val) |
void push_val(environment *env, value *val) |
250 |
{ |
{ |
251 |
stackitem *new_item= malloc(sizeof(stackitem)); |
stackitem *new_item= malloc(sizeof(stackitem)); |
252 |
new_item->item= val; |
new_item->item= val; |
253 |
val->refcount++; |
new_item->next= env->head; |
254 |
push(stack_head, new_item); |
env->head= new_item; |
255 |
} |
} |
256 |
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|
257 |
/* Push an integer onto the stack. */ |
/* Push an integer onto the stack. */ |
258 |
void push_int(stackitem **stack_head, int in_val) |
void push_int(environment *env, int in_val) |
259 |
{ |
{ |
260 |
value *new_value= malloc(sizeof(value)); |
value *new_value= new_val(env); |
|
stackitem *new_item= malloc(sizeof(stackitem)); |
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new_item->item= new_value; |
|
261 |
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262 |
new_value->content.val= in_val; |
new_value->content.val= in_val; |
263 |
new_value->type= integer; |
new_value->type= integer; |
|
new_value->refcount=1; |
|
264 |
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|
265 |
push(stack_head, new_item); |
push_val(env, new_value); |
266 |
} |
} |
267 |
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|
268 |
/* Copy a string onto the stack. */ |
/* Copy a string onto the stack. */ |
269 |
void push_cstring(stackitem **stack_head, const char *in_string) |
void push_cstring(environment *env, const char *in_string) |
270 |
{ |
{ |
271 |
value *new_value= malloc(sizeof(value)); |
value *new_value= new_val(env); |
|
stackitem *new_item= malloc(sizeof(stackitem)); |
|
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new_item->item=new_value; |
|
272 |
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273 |
new_value->content.ptr= malloc(strlen(in_string)+1); |
new_value->content.ptr= malloc(strlen(in_string)+1); |
274 |
strcpy(new_value->content.ptr, in_string); |
strcpy(new_value->content.ptr, in_string); |
275 |
new_value->type= string; |
new_value->type= string; |
|
new_value->refcount=1; |
|
276 |
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|
277 |
push(stack_head, new_item); |
push_val(env, new_value); |
278 |
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} |
279 |
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280 |
|
/* Mangle a symbol name to a valid C identifier name */ |
281 |
|
char *mangle_str(const char *old_string){ |
282 |
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char validchars[] |
283 |
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="0123456789abcdef"; |
284 |
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char *new_string, *current; |
285 |
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|
286 |
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new_string=malloc((strlen(old_string)*2)+4); |
287 |
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strcpy(new_string, "sx_"); /* Stack eXternal */ |
288 |
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current=new_string+3; |
289 |
|
while(old_string[0] != '\0'){ |
290 |
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current[0]=validchars[(unsigned char)(old_string[0])/16]; |
291 |
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current[1]=validchars[(unsigned char)(old_string[0])%16]; |
292 |
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current+=2; |
293 |
|
old_string++; |
294 |
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} |
295 |
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current[0]='\0'; |
296 |
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|
297 |
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return new_string; /* The caller must free() it */ |
298 |
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} |
299 |
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|
300 |
|
extern void mangle(environment *env){ |
301 |
|
char *new_string; |
302 |
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|
303 |
|
if((env->head)==NULL) { |
304 |
|
printerr("Too Few Arguments"); |
305 |
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env->err=1; |
306 |
|
return; |
307 |
|
} |
308 |
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|
309 |
|
if(env->head->item->type!=string) { |
310 |
|
printerr("Bad Argument Type"); |
311 |
|
env->err=2; |
312 |
|
return; |
313 |
|
} |
314 |
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|
315 |
|
new_string= mangle_str((const char *)(env->head->item->content.ptr)); |
316 |
|
|
317 |
|
toss(env); |
318 |
|
if(env->err) return; |
319 |
|
|
320 |
|
push_cstring(env, new_string); |
321 |
} |
} |
322 |
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|
323 |
/* Push a symbol onto the stack. */ |
/* Push a symbol onto the stack. */ |
324 |
void push_sym(environment *env, const char *in_string) |
void push_sym(environment *env, const char *in_string) |
325 |
{ |
{ |
|
stackitem *new_item; /* The new stack item */ |
|
|
/* ...which will contain... */ |
|
326 |
value *new_value; /* A new symbol value */ |
value *new_value; /* A new symbol value */ |
327 |
/* ...which might point to... */ |
/* ...which might point to... */ |
328 |
symbol **new_symbol; /* (if needed) A new actual symbol */ |
symbol **new_symbol; /* (if needed) A new actual symbol */ |
332 |
void *funcptr; /* A function pointer */ |
void *funcptr; /* A function pointer */ |
333 |
|
|
334 |
static void *handle= NULL; /* Dynamic linker handle */ |
static void *handle= NULL; /* Dynamic linker handle */ |
335 |
|
const char *dlerr; /* Dynamic linker error */ |
336 |
|
char *mangled; /* Mangled function name */ |
337 |
|
|
338 |
/* Create a new stack item containing a new value */ |
new_value= new_val(env); |
|
new_item= malloc(sizeof(stackitem)); |
|
|
new_value= malloc(sizeof(value)); |
|
|
new_item->item=new_value; |
|
339 |
|
|
340 |
/* The new value is a symbol */ |
/* The new value is a symbol */ |
341 |
new_value->type= symb; |
new_value->type= symb; |
|
new_value->refcount= 1; |
|
342 |
|
|
343 |
/* Look up the symbol name in the hash table */ |
/* Look up the symbol name in the hash table */ |
344 |
new_symbol= hash(env->symbols, in_string); |
new_symbol= hash(env->symbols, in_string); |
361 |
if(handle==NULL) /* If no handle */ |
if(handle==NULL) /* If no handle */ |
362 |
handle= dlopen(NULL, RTLD_LAZY); |
handle= dlopen(NULL, RTLD_LAZY); |
363 |
|
|
364 |
funcptr= dlsym(handle, in_string); /* Get function pointer */ |
mangled=mangle_str(in_string); /* mangle the name */ |
365 |
if(dlerror()==NULL) { /* If a function was found */ |
funcptr= dlsym(handle, mangled); /* and try to find it */ |
366 |
new_fvalue= malloc(sizeof(value)); /* Create a new value */ |
free(mangled); |
367 |
|
dlerr=dlerror(); |
368 |
|
if(dlerr != NULL) { /* If no function was found */ |
369 |
|
funcptr= dlsym(handle, in_string); /* Get function pointer */ |
370 |
|
dlerr=dlerror(); |
371 |
|
} |
372 |
|
if(dlerr==NULL) { /* If a function was found */ |
373 |
|
new_fvalue= new_val(env); /* Create a new value */ |
374 |
new_fvalue->type=func; /* The new value is a function pointer */ |
new_fvalue->type=func; /* The new value is a function pointer */ |
375 |
new_fvalue->content.ptr=funcptr; /* Store function pointer */ |
new_fvalue->content.ptr=funcptr; /* Store function pointer */ |
376 |
(*new_symbol)->val= new_fvalue; /* Bind the symbol to the new |
(*new_symbol)->val= new_fvalue; /* Bind the symbol to the new |
377 |
function value */ |
function value */ |
|
new_fvalue->refcount= 1; |
|
378 |
} |
} |
379 |
} |
} |
380 |
push(&(env->head), new_item); |
push_val(env, new_value); |
|
} |
|
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|
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void printerr(const char* in_string) { |
|
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fprintf(stderr, "Err: %s\n", in_string); |
|
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} |
|
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/* Throw away a value */ |
|
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void free_val(value *val){ |
|
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stackitem *item, *temp; |
|
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|
|
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val->refcount--; /* Decrease the reference count */ |
|
|
if(val->refcount == 0){ |
|
|
switch (val->type){ /* and free the contents if necessary */ |
|
|
case string: |
|
|
free(val->content.ptr); |
|
|
break; |
|
|
case list: /* lists needs to be freed recursively */ |
|
|
item=val->content.ptr; |
|
|
while(item != NULL) { /* for all stack items */ |
|
|
free_val(item->item); /* free the value */ |
|
|
temp=item->next; /* save next ptr */ |
|
|
free(item); /* free the stackitem */ |
|
|
item=temp; /* go to next stackitem */ |
|
|
} |
|
|
free(val); /* Free the actual list value */ |
|
|
break; |
|
|
default: |
|
|
break; |
|
|
} |
|
|
} |
|
|
} |
|
|
|
|
|
/* Discard the top element of the stack. */ |
|
|
extern void toss(environment *env) |
|
|
{ |
|
|
stackitem *temp= env->head; |
|
|
|
|
|
if((env->head)==NULL) { |
|
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
|
} |
|
|
|
|
|
free_val(env->head->item); /* Free the value */ |
|
|
env->head= env->head->next; /* Remove the top stack item */ |
|
|
free(temp); /* Free the old top stack item */ |
|
381 |
} |
} |
382 |
|
|
383 |
/* Print newline. */ |
/* Print newline. */ |
413 |
case list: |
case list: |
414 |
push_sym(env, "list"); |
push_sym(env, "list"); |
415 |
break; |
break; |
|
default: |
|
|
push_sym(env, "unknown"); |
|
|
break; |
|
416 |
} |
} |
417 |
} |
} |
418 |
|
|
419 |
/* Prints the top element of the stack. */ |
/* Prints the top element of the stack. */ |
420 |
void print_h(stackitem *stack_head) |
void print_h(stackitem *stack_head, int noquote) |
421 |
{ |
{ |
422 |
switch(stack_head->item->type) { |
switch(stack_head->item->type) { |
423 |
case integer: |
case integer: |
424 |
printf("%d", stack_head->item->content.val); |
printf("%d", stack_head->item->content.val); |
425 |
break; |
break; |
426 |
case string: |
case string: |
427 |
printf("\"%s\"", (char*)stack_head->item->content.ptr); |
if(noquote) |
428 |
|
printf("%s", (char*)stack_head->item->content.ptr); |
429 |
|
else |
430 |
|
printf("\"%s\"", (char*)stack_head->item->content.ptr); |
431 |
break; |
break; |
432 |
case symb: |
case symb: |
433 |
printf("'%s'", ((symbol *)(stack_head->item->content.ptr))->id); |
printf("%s", ((symbol *)(stack_head->item->content.ptr))->id); |
434 |
break; |
break; |
435 |
case func: |
case func: |
436 |
printf("#<function %p>", (funcp)(stack_head->item->content.ptr)); |
printf("#<function %p>", (funcp)(stack_head->item->content.ptr)); |
440 |
stack_head=(stackitem *)(stack_head->item->content.ptr); |
stack_head=(stackitem *)(stack_head->item->content.ptr); |
441 |
printf("[ "); |
printf("[ "); |
442 |
while(stack_head != NULL) { |
while(stack_head != NULL) { |
443 |
print_h(stack_head); |
print_h(stack_head, noquote); |
444 |
printf(" "); |
printf(" "); |
445 |
stack_head=stack_head->next; |
stack_head=stack_head->next; |
446 |
} |
} |
447 |
printf("]"); |
printf("]"); |
448 |
break; |
break; |
|
default: |
|
|
printf("#<unknown %p>", (stack_head->item->content.ptr)); |
|
|
break; |
|
449 |
} |
} |
450 |
} |
} |
451 |
|
|
455 |
env->err=1; |
env->err=1; |
456 |
return; |
return; |
457 |
} |
} |
458 |
print_h(env->head); |
print_h(env->head, 0); |
459 |
|
nl(); |
460 |
} |
} |
461 |
|
|
462 |
/* Prints the top element of the stack and then discards it. */ |
/* Prints the top element of the stack and then discards it. */ |
467 |
toss(env); |
toss(env); |
468 |
} |
} |
469 |
|
|
470 |
|
extern void princ_(environment *env) { |
471 |
|
if(env->head==NULL) { |
472 |
|
printerr("Too Few Arguments"); |
473 |
|
env->err=1; |
474 |
|
return; |
475 |
|
} |
476 |
|
print_h(env->head, 1); |
477 |
|
} |
478 |
|
|
479 |
|
/* Prints the top element of the stack and then discards it. */ |
480 |
|
extern void princ(environment *env) |
481 |
|
{ |
482 |
|
princ_(env); |
483 |
|
if(env->err) return; |
484 |
|
toss(env); |
485 |
|
} |
486 |
|
|
487 |
/* Only to be called by function printstack. */ |
/* Only to be called by function printstack. */ |
488 |
void print_st(stackitem *stack_head, long counter) |
void print_st(stackitem *stack_head, long counter) |
489 |
{ |
{ |
490 |
if(stack_head->next != NULL) |
if(stack_head->next != NULL) |
491 |
print_st(stack_head->next, counter+1); |
print_st(stack_head->next, counter+1); |
492 |
printf("%ld: ", counter); |
printf("%ld: ", counter); |
493 |
print_h(stack_head); |
print_h(stack_head, 0); |
494 |
nl(); |
nl(); |
495 |
} |
} |
496 |
|
|
|
|
|
|
|
|
497 |
/* Prints the stack. */ |
/* Prints the stack. */ |
498 |
extern void printstack(environment *env) |
extern void printstack(environment *env) |
499 |
{ |
{ |
500 |
if(env->head == NULL) { |
if(env->head == NULL) { |
501 |
|
printf("Stack Empty\n"); |
502 |
return; |
return; |
503 |
} |
} |
504 |
print_st(env->head, 1); |
print_st(env->head, 1); |
|
nl(); |
|
505 |
} |
} |
506 |
|
|
507 |
/* Swap the two top elements on the stack. */ |
/* Swap the two top elements on the stack. */ |
509 |
{ |
{ |
510 |
stackitem *temp= env->head; |
stackitem *temp= env->head; |
511 |
|
|
512 |
if((env->head)==NULL) { |
if(env->head==NULL || env->head->next==NULL) { |
|
printerr("Too Few Arguments"); |
|
|
env->err=1; |
|
|
return; |
|
|
} |
|
|
|
|
|
if(env->head->next==NULL) { |
|
513 |
printerr("Too Few Arguments"); |
printerr("Too Few Arguments"); |
514 |
env->err=1; |
env->err=1; |
515 |
return; |
return; |
520 |
env->head->next= temp; |
env->head->next= temp; |
521 |
} |
} |
522 |
|
|
523 |
stackitem* copy(stackitem* in_item) |
/* Rotate the first three elements on the stack. */ |
524 |
|
extern void rot(environment *env) |
525 |
{ |
{ |
526 |
stackitem *out_item= malloc(sizeof(stackitem)); |
stackitem *temp= env->head; |
527 |
|
|
528 |
memcpy(out_item, in_item, sizeof(stackitem)); |
if(env->head==NULL || env->head->next==NULL |
529 |
out_item->next= NULL; |
|| env->head->next->next==NULL) { |
530 |
|
printerr("Too Few Arguments"); |
531 |
|
env->err=1; |
532 |
|
return; |
533 |
|
} |
534 |
|
|
535 |
return out_item; |
env->head= env->head->next->next; |
536 |
|
temp->next->next= env->head->next; |
537 |
|
env->head->next= temp; |
538 |
} |
} |
539 |
|
|
540 |
/* Recall a value from a symbol, if bound */ |
/* Recall a value from a symbol, if bound */ |
562 |
} |
} |
563 |
toss(env); /* toss the symbol */ |
toss(env); /* toss the symbol */ |
564 |
if(env->err) return; |
if(env->err) return; |
565 |
push_val(&(env->head), val); /* Return its bound value */ |
push_val(env, val); /* Return its bound value */ |
566 |
} |
} |
567 |
|
|
568 |
/* If the top element is a symbol, determine if it's bound to a |
/* If the top element is a symbol, determine if it's bound to a |
571 |
extern void eval(environment *env) |
extern void eval(environment *env) |
572 |
{ |
{ |
573 |
funcp in_func; |
funcp in_func; |
574 |
|
value* temp_val; |
575 |
|
stackitem* iterator; |
576 |
|
|
577 |
|
eval_start: |
578 |
|
|
579 |
if(env->head==NULL) { |
if(env->head==NULL) { |
580 |
printerr("Too Few Arguments"); |
printerr("Too Few Arguments"); |
581 |
env->err=1; |
env->err=1; |
582 |
return; |
return; |
583 |
} |
} |
584 |
|
|
585 |
/* if it's a symbol */ |
switch(env->head->item->type) { |
586 |
if(env->head->item->type==symb) { |
/* if it's a symbol */ |
587 |
|
case symb: |
588 |
rcl(env); /* get its contents */ |
rcl(env); /* get its contents */ |
589 |
if(env->err) return; |
if(env->err) return; |
590 |
if(env->head->item->type!=symb){ /* don't recurse symbols */ |
if(env->head->item->type!=symb){ /* don't recurse symbols */ |
591 |
eval(env); /* evaluate the value */ |
goto eval_start; |
|
return; |
|
592 |
} |
} |
593 |
} |
return; |
594 |
|
|
595 |
/* If it's a lone function value, run it */ |
/* If it's a lone function value, run it */ |
596 |
if(env->head->item->type==func) { |
case func: |
597 |
in_func= (funcp)(env->head->item->content.ptr); |
in_func= (funcp)(env->head->item->content.ptr); |
598 |
toss(env); |
toss(env); |
599 |
if(env->err) return; |
if(env->err) return; |
600 |
(*in_func)(env); |
return (*in_func)(env); |
601 |
|
|
602 |
|
/* If it's a list */ |
603 |
|
case list: |
604 |
|
temp_val= env->head->item; |
605 |
|
toss(env); |
606 |
|
if(env->err) return; |
607 |
|
iterator= (stackitem*)temp_val->content.ptr; |
608 |
|
while(iterator!=NULL) { |
609 |
|
push_val(env, iterator->item); |
610 |
|
if(env->head->item->type==symb |
611 |
|
&& strcmp(";", ((symbol*)(env->head->item->content.ptr))->id)==0) { |
612 |
|
toss(env); |
613 |
|
if(env->err) return; |
614 |
|
if(iterator->next == NULL){ |
615 |
|
goto eval_start; |
616 |
|
} |
617 |
|
eval(env); |
618 |
|
if(env->err) return; |
619 |
|
} |
620 |
|
iterator= iterator->next; |
621 |
|
} |
622 |
|
return; |
623 |
|
|
624 |
|
default: |
625 |
|
return; |
626 |
} |
} |
627 |
} |
} |
628 |
|
|
629 |
/* Reverse a list */ |
/* Reverse (flip) a list */ |
630 |
extern void rev(environment *env){ |
extern void rev(environment *env){ |
631 |
stackitem *old_head, *new_head, *item; |
stackitem *old_head, *new_head, *item; |
632 |
|
|
656 |
/* Make a list. */ |
/* Make a list. */ |
657 |
extern void pack(environment *env) |
extern void pack(environment *env) |
658 |
{ |
{ |
|
void* delimiter; |
|
659 |
stackitem *iterator, *temp; |
stackitem *iterator, *temp; |
660 |
value *pack; |
value *pack; |
661 |
|
|
|
delimiter= env->head->item->content.ptr; /* Get delimiter */ |
|
|
toss(env); |
|
|
|
|
662 |
iterator= env->head; |
iterator= env->head; |
663 |
|
|
664 |
if(iterator==NULL || iterator->item->content.ptr==delimiter) { |
if(iterator==NULL |
665 |
|
|| (iterator->item->type==symb |
666 |
|
&& ((symbol*)(iterator->item->content.ptr))->id[0]=='[')) { |
667 |
temp= NULL; |
temp= NULL; |
668 |
toss(env); |
toss(env); |
669 |
} else { |
} else { |
670 |
/* Search for first delimiter */ |
/* Search for first delimiter */ |
671 |
while(iterator->next!=NULL |
while(iterator->next!=NULL |
672 |
&& iterator->next->item->content.ptr!=delimiter) |
&& (iterator->next->item->type!=symb |
673 |
|
|| ((symbol*)(iterator->next->item->content.ptr))->id[0]!='[')) |
674 |
iterator= iterator->next; |
iterator= iterator->next; |
675 |
|
|
676 |
/* Extract list */ |
/* Extract list */ |
683 |
} |
} |
684 |
|
|
685 |
/* Push list */ |
/* Push list */ |
686 |
pack= malloc(sizeof(value)); |
pack= new_val(env); |
687 |
pack->type= list; |
pack->type= list; |
688 |
pack->content.ptr= temp; |
pack->content.ptr= temp; |
|
pack->refcount= 1; |
|
|
|
|
|
temp= malloc(sizeof(stackitem)); |
|
|
temp->item= pack; |
|
689 |
|
|
690 |
push(&(env->head), temp); |
push_val(env, pack); |
691 |
rev(env); |
rev(env); |
692 |
} |
} |
693 |
|
|
|
/* Parse input. */ |
|
|
void stack_read(environment *env, char *in_line) |
|
|
{ |
|
|
char *temp, *rest; |
|
|
int itemp; |
|
|
size_t inlength= strlen(in_line)+1; |
|
|
int convert= 0; |
|
|
static int non_eval_flag= 0; |
|
|
|
|
|
temp= malloc(inlength); |
|
|
rest= malloc(inlength); |
|
|
|
|
|
do { |
|
|
/* If comment */ |
|
|
if((convert= sscanf(in_line, "#%[^\n\r]", rest))) { |
|
|
free(temp); free(rest); |
|
|
return; |
|
|
} |
|
|
|
|
|
/* If string */ |
|
|
if((convert= sscanf(in_line, "\"%[^\"\n\r]\" %[^\n\r]", temp, rest))) { |
|
|
push_cstring(&(env->head), temp); |
|
|
break; |
|
|
} |
|
|
/* If integer */ |
|
|
if((convert= sscanf(in_line, "%d %[^\n\r]", &itemp, rest))) { |
|
|
push_int(&(env->head), itemp); |
|
|
break; |
|
|
} |
|
|
/* Escape ';' with '\' */ |
|
|
if((convert= sscanf(in_line, "\\%c%[^\n\r]", temp, rest))) { |
|
|
temp[1]= '\0'; |
|
|
push_sym(env, temp); |
|
|
break; |
|
|
} |
|
|
/* If symbol */ |
|
|
if((convert= sscanf(in_line, "%[^][ ;\n\r]%[^\n\r]", temp, rest))) { |
|
|
push_sym(env, temp); |
|
|
break; |
|
|
} |
|
|
/* If single char */ |
|
|
if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest))) { |
|
|
if(*temp==';') { |
|
|
if(!non_eval_flag) { |
|
|
eval(env); /* Evaluate top element */ |
|
|
break; |
|
|
} |
|
|
|
|
|
push_sym(env, ";"); |
|
|
break; |
|
|
} |
|
|
|
|
|
if(*temp==']') { |
|
|
push_sym(env, "["); |
|
|
pack(env); |
|
|
if(non_eval_flag!=0) |
|
|
non_eval_flag--; |
|
|
break; |
|
|
} |
|
|
|
|
|
if(*temp=='[') { |
|
|
push_sym(env, "["); |
|
|
non_eval_flag++; |
|
|
break; |
|
|
} |
|
|
} |
|
|
} while(0); |
|
|
|
|
|
free(temp); |
|
|
|
|
|
if(convert<2) { |
|
|
free(rest); |
|
|
return; |
|
|
} |
|
|
|
|
|
stack_read(env, rest); |
|
|
|
|
|
free(rest); |
|
|
} |
|
|
|
|
694 |
/* Relocate elements of the list on the stack. */ |
/* Relocate elements of the list on the stack. */ |
695 |
extern void expand(environment *env) |
extern void expand(environment *env) |
696 |
{ |
{ |
716 |
/* The first list element is the new stack head */ |
/* The first list element is the new stack head */ |
717 |
new_head= temp= env->head->item->content.ptr; |
new_head= temp= env->head->item->content.ptr; |
718 |
|
|
|
env->head->item->refcount++; |
|
719 |
toss(env); |
toss(env); |
720 |
|
|
721 |
/* Find the end of the list */ |
/* Find the end of the list */ |
746 |
result= (left==right); |
result= (left==right); |
747 |
|
|
748 |
toss(env); toss(env); |
toss(env); toss(env); |
749 |
push_int(&(env->head), result); |
push_int(env, result); |
750 |
} |
} |
751 |
|
|
752 |
/* Negates the top element on the stack. */ |
/* Negates the top element on the stack. */ |
768 |
|
|
769 |
val= env->head->item->content.val; |
val= env->head->item->content.val; |
770 |
toss(env); |
toss(env); |
771 |
push_int(&(env->head), !val); |
push_int(env, !val); |
772 |
} |
} |
773 |
|
|
774 |
/* Compares the two top elements on the stack and return 0 if they're the |
/* Compares the two top elements on the stack and return 0 if they're the |
801 |
sym=env->head->item->content.ptr; |
sym=env->head->item->content.ptr; |
802 |
|
|
803 |
/* if the symbol was bound to something else, throw it away */ |
/* if the symbol was bound to something else, throw it away */ |
|
if(sym->val != NULL) |
|
|
free_val(sym->val); |
|
804 |
|
|
805 |
/* Bind the symbol to the value */ |
/* Bind the symbol to the value */ |
806 |
sym->val= env->head->next->item; |
sym->val= env->head->next->item; |
|
sym->val->refcount++; /* Increase the reference counter */ |
|
807 |
|
|
808 |
toss(env); toss(env); |
toss(env); toss(env); |
809 |
} |
} |
810 |
|
|
811 |
|
extern void clear(environment *); |
812 |
|
void forget_sym(symbol **); |
813 |
|
|
814 |
/* Quit stack. */ |
/* Quit stack. */ |
815 |
extern void quit(environment *env) |
extern void quit(environment *env) |
816 |
{ |
{ |
817 |
|
long i; |
818 |
|
|
819 |
|
clear(env); |
820 |
|
|
821 |
|
if (env->err) return; |
822 |
|
for(i= 0; i<HASHTBLSIZE; i++) { |
823 |
|
while(env->symbols[i]!= NULL) { |
824 |
|
forget_sym(&(env->symbols[i])); |
825 |
|
} |
826 |
|
env->symbols[i]= NULL; |
827 |
|
} |
828 |
|
|
829 |
|
gc_init(env); |
830 |
|
|
831 |
|
if(env->free_string!=NULL) |
832 |
|
free(env->free_string); |
833 |
|
|
834 |
|
muntrace(); |
835 |
|
|
836 |
exit(EXIT_SUCCESS); |
exit(EXIT_SUCCESS); |
837 |
} |
} |
838 |
|
|
858 |
} |
} |
859 |
} |
} |
860 |
|
|
861 |
|
/* Internal forget function */ |
862 |
|
void forget_sym(symbol **hash_entry) { |
863 |
|
symbol *temp; |
864 |
|
|
865 |
|
temp= *hash_entry; |
866 |
|
*hash_entry= (*hash_entry)->next; |
867 |
|
|
868 |
|
free(temp->id); |
869 |
|
free(temp); |
870 |
|
} |
871 |
|
|
872 |
/* Forgets a symbol (remove it from the hash table) */ |
/* Forgets a symbol (remove it from the hash table) */ |
873 |
extern void forget(environment *env) |
extern void forget(environment *env) |
874 |
{ |
{ |
875 |
char* sym_id; |
char* sym_id; |
876 |
stackitem *stack_head= env->head; |
stackitem *stack_head= env->head; |
|
symbol **hash_entry, *temp; |
|
877 |
|
|
878 |
if(stack_head==NULL) { |
if(stack_head==NULL) { |
879 |
printerr("Too Few Arguments"); |
printerr("Too Few Arguments"); |
890 |
sym_id= ((symbol*)(stack_head->item->content.ptr))->id; |
sym_id= ((symbol*)(stack_head->item->content.ptr))->id; |
891 |
toss(env); |
toss(env); |
892 |
|
|
893 |
hash_entry= hash(env->symbols, sym_id); |
return forget_sym(hash(env->symbols, sym_id)); |
|
temp= *hash_entry; |
|
|
*hash_entry= (*hash_entry)->next; |
|
|
|
|
|
if(temp->val!=NULL) { |
|
|
free_val(temp->val); |
|
|
} |
|
|
free(temp->id); |
|
|
free(temp); |
|
894 |
} |
} |
895 |
|
|
896 |
/* Returns the current error number to the stack */ |
/* Returns the current error number to the stack */ |
897 |
extern void errn(environment *env){ |
extern void errn(environment *env){ |
898 |
push_int(&(env->head), env->err); |
push_int(env, env->err); |
899 |
} |
} |
900 |
|
|
901 |
int main() |
extern void sx_72656164(environment*); |
902 |
|
|
903 |
|
int main(int argc, char **argv) |
904 |
{ |
{ |
905 |
environment myenv; |
environment myenv; |
906 |
char in_string[100]; |
|
907 |
|
int c; /* getopt option character */ |
908 |
|
|
909 |
|
mtrace(); |
910 |
|
|
911 |
init_env(&myenv); |
init_env(&myenv); |
912 |
|
|
913 |
printf("okidok\n "); |
myenv.interactive = isatty(STDIN_FILENO) && isatty(STDOUT_FILENO); |
914 |
|
|
915 |
|
while ((c = getopt (argc, argv, "i")) != -1) |
916 |
|
switch (c) |
917 |
|
{ |
918 |
|
case 'i': |
919 |
|
myenv.interactive = 1; |
920 |
|
break; |
921 |
|
case '?': |
922 |
|
fprintf (stderr, |
923 |
|
"Unknown option character `\\x%x'.\n", |
924 |
|
optopt); |
925 |
|
return EX_USAGE; |
926 |
|
default: |
927 |
|
abort (); |
928 |
|
} |
929 |
|
|
930 |
|
if (optind < argc) { |
931 |
|
myenv.interactive = 0; |
932 |
|
myenv.inputstream= fopen(argv[optind], "r"); |
933 |
|
if(myenv.inputstream== NULL) { |
934 |
|
perror(argv[0]); |
935 |
|
exit (EX_NOINPUT); |
936 |
|
} |
937 |
|
} |
938 |
|
|
939 |
while(fgets(in_string, 100, stdin) != NULL) { |
while(1) { |
940 |
stack_read(&myenv, in_string); |
if(myenv.in_string==NULL) { |
941 |
if(myenv.err) { |
if (myenv.interactive) { |
942 |
printf("(error %d) ", myenv.err); |
if(myenv.err) { |
943 |
|
printf("(error %d)\n", myenv.err); |
944 |
|
} |
945 |
|
nl(); |
946 |
|
printstack(&myenv); |
947 |
|
printf("> "); |
948 |
|
} |
949 |
myenv.err=0; |
myenv.err=0; |
950 |
} |
} |
951 |
printf("okidok\n "); |
sx_72656164(&myenv); |
952 |
|
if (myenv.err==4) { |
953 |
|
return EX_NOINPUT; |
954 |
|
} else if(myenv.head!=NULL |
955 |
|
&& myenv.head->item->type==symb |
956 |
|
&& ((symbol*)(myenv.head->item->content.ptr))->id[0]==';') { |
957 |
|
toss(&myenv); /* No error check in main */ |
958 |
|
eval(&myenv); |
959 |
|
} |
960 |
} |
} |
961 |
quit(&myenv); |
quit(&myenv); |
962 |
return EXIT_FAILURE; |
return EXIT_FAILURE; |
963 |
} |
} |
964 |
|
|
965 |
|
/* "+" */ |
966 |
|
extern void sx_2b(environment *env) { |
967 |
|
int a, b; |
968 |
|
size_t len; |
969 |
|
char* new_string; |
970 |
|
value *a_val, *b_val; |
971 |
|
|
972 |
|
if((env->head)==NULL || env->head->next==NULL) { |
973 |
|
printerr("Too Few Arguments"); |
974 |
|
env->err=1; |
975 |
|
return; |
976 |
|
} |
977 |
|
|
978 |
|
if(env->head->item->type==string |
979 |
|
&& env->head->next->item->type==string) { |
980 |
|
a_val= env->head->item; |
981 |
|
b_val= env->head->next->item; |
982 |
|
toss(env); if(env->err) return; |
983 |
|
toss(env); if(env->err) return; |
984 |
|
len= strlen(a_val->content.ptr)+strlen(b_val->content.ptr)+1; |
985 |
|
new_string= malloc(len); |
986 |
|
strcpy(new_string, b_val->content.ptr); |
987 |
|
strcat(new_string, a_val->content.ptr); |
988 |
|
push_cstring(env, new_string); |
989 |
|
free(new_string); |
990 |
|
return; |
991 |
|
} |
992 |
|
|
993 |
|
if(env->head->item->type!=integer |
994 |
|
|| env->head->next->item->type!=integer) { |
995 |
|
printerr("Bad Argument Type"); |
996 |
|
env->err=2; |
997 |
|
return; |
998 |
|
} |
999 |
|
a=env->head->item->content.val; |
1000 |
|
toss(env); if(env->err) return; |
1001 |
|
|
1002 |
|
b=env->head->item->content.val; |
1003 |
|
toss(env); if(env->err) return; |
1004 |
|
push_int(env, a+b); |
1005 |
|
} |
1006 |
|
|
1007 |
|
/* "-" */ |
1008 |
|
extern void sx_2d(environment *env) { |
1009 |
|
int a, b; |
1010 |
|
|
1011 |
|
if((env->head)==NULL || env->head->next==NULL) { |
1012 |
|
printerr("Too Few Arguments"); |
1013 |
|
env->err=1; |
1014 |
|
return; |
1015 |
|
} |
1016 |
|
|
1017 |
|
if(env->head->item->type!=integer |
1018 |
|
|| env->head->next->item->type!=integer) { |
1019 |
|
printerr("Bad Argument Type"); |
1020 |
|
env->err=2; |
1021 |
|
return; |
1022 |
|
} |
1023 |
|
a=env->head->item->content.val; |
1024 |
|
toss(env); if(env->err) return; |
1025 |
|
b=env->head->item->content.val; |
1026 |
|
toss(env); if(env->err) return; |
1027 |
|
push_int(env, b-a); |
1028 |
|
} |
1029 |
|
|
1030 |
|
/* ">" */ |
1031 |
|
extern void sx_3e(environment *env) { |
1032 |
|
int a, b; |
1033 |
|
|
1034 |
|
if((env->head)==NULL || env->head->next==NULL) { |
1035 |
|
printerr("Too Few Arguments"); |
1036 |
|
env->err=1; |
1037 |
|
return; |
1038 |
|
} |
1039 |
|
|
1040 |
|
if(env->head->item->type!=integer |
1041 |
|
|| env->head->next->item->type!=integer) { |
1042 |
|
printerr("Bad Argument Type"); |
1043 |
|
env->err=2; |
1044 |
|
return; |
1045 |
|
} |
1046 |
|
a=env->head->item->content.val; |
1047 |
|
toss(env); if(env->err) return; |
1048 |
|
b=env->head->item->content.val; |
1049 |
|
toss(env); if(env->err) return; |
1050 |
|
push_int(env, b>a); |
1051 |
|
} |
1052 |
|
|
1053 |
|
/* Return copy of a value */ |
1054 |
|
value *copy_val(environment *env, value *old_value){ |
1055 |
|
stackitem *old_item, *new_item, *prev_item; |
1056 |
|
|
1057 |
|
value *new_value=new_val(env); |
1058 |
|
|
1059 |
|
new_value->type=old_value->type; |
1060 |
|
|
1061 |
|
switch(old_value->type){ |
1062 |
|
case integer: |
1063 |
|
new_value->content.val=old_value->content.val; |
1064 |
|
break; |
1065 |
|
case string: |
1066 |
|
(char *)(new_value->content.ptr) |
1067 |
|
= strdup((char *)(old_value->content.ptr)); |
1068 |
|
break; |
1069 |
|
case func: |
1070 |
|
case symb: |
1071 |
|
new_value->content.ptr=old_value->content.ptr; |
1072 |
|
break; |
1073 |
|
case list: |
1074 |
|
new_value->content.ptr=NULL; |
1075 |
|
|
1076 |
|
prev_item=NULL; |
1077 |
|
old_item=(stackitem *)(old_value->content.ptr); |
1078 |
|
|
1079 |
|
while(old_item != NULL) { /* While list is not empty */ |
1080 |
|
new_item= malloc(sizeof(stackitem)); |
1081 |
|
new_item->item=copy_val(env, old_item->item); /* recurse */ |
1082 |
|
new_item->next=NULL; |
1083 |
|
if(prev_item != NULL) /* If this wasn't the first item */ |
1084 |
|
prev_item->next=new_item; /* point the previous item to the |
1085 |
|
new item */ |
1086 |
|
else |
1087 |
|
new_value->content.ptr=new_item; |
1088 |
|
old_item=old_item->next; |
1089 |
|
prev_item=new_item; |
1090 |
|
} |
1091 |
|
break; |
1092 |
|
} |
1093 |
|
return new_value; |
1094 |
|
} |
1095 |
|
|
1096 |
|
/* "dup"; duplicates an item on the stack */ |
1097 |
|
extern void sx_647570(environment *env) { |
1098 |
|
if((env->head)==NULL) { |
1099 |
|
printerr("Too Few Arguments"); |
1100 |
|
env->err=1; |
1101 |
|
return; |
1102 |
|
} |
1103 |
|
push_val(env, copy_val(env, env->head->item)); |
1104 |
|
} |
1105 |
|
|
1106 |
|
/* "if", If-Then */ |
1107 |
|
extern void sx_6966(environment *env) { |
1108 |
|
|
1109 |
|
int truth; |
1110 |
|
|
1111 |
|
if((env->head)==NULL || env->head->next==NULL) { |
1112 |
|
printerr("Too Few Arguments"); |
1113 |
|
env->err=1; |
1114 |
|
return; |
1115 |
|
} |
1116 |
|
|
1117 |
|
if(env->head->next->item->type != integer) { |
1118 |
|
printerr("Bad Argument Type"); |
1119 |
|
env->err=2; |
1120 |
|
return; |
1121 |
|
} |
1122 |
|
|
1123 |
|
swap(env); |
1124 |
|
if(env->err) return; |
1125 |
|
|
1126 |
|
truth=env->head->item->content.val; |
1127 |
|
|
1128 |
|
toss(env); |
1129 |
|
if(env->err) return; |
1130 |
|
|
1131 |
|
if(truth) |
1132 |
|
eval(env); |
1133 |
|
else |
1134 |
|
toss(env); |
1135 |
|
} |
1136 |
|
|
1137 |
|
/* If-Then-Else */ |
1138 |
|
extern void ifelse(environment *env) { |
1139 |
|
|
1140 |
|
int truth; |
1141 |
|
|
1142 |
|
if((env->head)==NULL || env->head->next==NULL |
1143 |
|
|| env->head->next->next==NULL) { |
1144 |
|
printerr("Too Few Arguments"); |
1145 |
|
env->err=1; |
1146 |
|
return; |
1147 |
|
} |
1148 |
|
|
1149 |
|
if(env->head->next->next->item->type != integer) { |
1150 |
|
printerr("Bad Argument Type"); |
1151 |
|
env->err=2; |
1152 |
|
return; |
1153 |
|
} |
1154 |
|
|
1155 |
|
rot(env); |
1156 |
|
if(env->err) return; |
1157 |
|
|
1158 |
|
truth=env->head->item->content.val; |
1159 |
|
|
1160 |
|
toss(env); |
1161 |
|
if(env->err) return; |
1162 |
|
|
1163 |
|
if(!truth) |
1164 |
|
swap(env); |
1165 |
|
if(env->err) return; |
1166 |
|
|
1167 |
|
toss(env); |
1168 |
|
if(env->err) return; |
1169 |
|
|
1170 |
|
eval(env); |
1171 |
|
} |
1172 |
|
|
1173 |
|
/* "while" */ |
1174 |
|
extern void sx_7768696c65(environment *env) { |
1175 |
|
|
1176 |
|
int truth; |
1177 |
|
value *loop, *test; |
1178 |
|
|
1179 |
|
if((env->head)==NULL || env->head->next==NULL) { |
1180 |
|
printerr("Too Few Arguments"); |
1181 |
|
env->err=1; |
1182 |
|
return; |
1183 |
|
} |
1184 |
|
|
1185 |
|
loop= env->head->item; |
1186 |
|
toss(env); if(env->err) return; |
1187 |
|
|
1188 |
|
test= env->head->item; |
1189 |
|
toss(env); if(env->err) return; |
1190 |
|
|
1191 |
|
do { |
1192 |
|
push_val(env, test); |
1193 |
|
eval(env); |
1194 |
|
|
1195 |
|
if(env->head->item->type != integer) { |
1196 |
|
printerr("Bad Argument Type"); |
1197 |
|
env->err=2; |
1198 |
|
return; |
1199 |
|
} |
1200 |
|
|
1201 |
|
truth= env->head->item->content.val; |
1202 |
|
toss(env); if(env->err) return; |
1203 |
|
|
1204 |
|
if(truth) { |
1205 |
|
push_val(env, loop); |
1206 |
|
eval(env); |
1207 |
|
} else { |
1208 |
|
toss(env); |
1209 |
|
} |
1210 |
|
|
1211 |
|
} while(truth); |
1212 |
|
} |
1213 |
|
|
1214 |
|
/* "for"; For-loop */ |
1215 |
|
extern void sx_666f72(environment *env) { |
1216 |
|
|
1217 |
|
value *loop, *foo; |
1218 |
|
stackitem *iterator; |
1219 |
|
|
1220 |
|
if((env->head)==NULL || env->head->next==NULL) { |
1221 |
|
printerr("Too Few Arguments"); |
1222 |
|
env->err=1; |
1223 |
|
return; |
1224 |
|
} |
1225 |
|
|
1226 |
|
if(env->head->next->item->type != list) { |
1227 |
|
printerr("Bad Argument Type"); |
1228 |
|
env->err=2; |
1229 |
|
return; |
1230 |
|
} |
1231 |
|
|
1232 |
|
loop= env->head->item; |
1233 |
|
toss(env); if(env->err) return; |
1234 |
|
|
1235 |
|
foo= env->head->item; |
1236 |
|
toss(env); if(env->err) return; |
1237 |
|
|
1238 |
|
iterator= foo->content.ptr; |
1239 |
|
|
1240 |
|
while(iterator!=NULL) { |
1241 |
|
push_val(env, iterator->item); |
1242 |
|
push_val(env, loop); |
1243 |
|
eval(env); if(env->err) return; |
1244 |
|
iterator= iterator->next; |
1245 |
|
} |
1246 |
|
} |
1247 |
|
|
1248 |
|
/* "to" */ |
1249 |
|
extern void to(environment *env) { |
1250 |
|
int i, start, ending; |
1251 |
|
stackitem *temp_head; |
1252 |
|
value *temp_val; |
1253 |
|
|
1254 |
|
if((env->head)==NULL || env->head->next==NULL) { |
1255 |
|
printerr("Too Few Arguments"); |
1256 |
|
env->err=1; |
1257 |
|
return; |
1258 |
|
} |
1259 |
|
|
1260 |
|
if(env->head->item->type!=integer |
1261 |
|
|| env->head->next->item->type!=integer) { |
1262 |
|
printerr("Bad Argument Type"); |
1263 |
|
env->err=2; |
1264 |
|
return; |
1265 |
|
} |
1266 |
|
|
1267 |
|
ending= env->head->item->content.val; |
1268 |
|
toss(env); if(env->err) return; |
1269 |
|
start= env->head->item->content.val; |
1270 |
|
toss(env); if(env->err) return; |
1271 |
|
|
1272 |
|
temp_head= env->head; |
1273 |
|
env->head= NULL; |
1274 |
|
|
1275 |
|
if(ending>=start) { |
1276 |
|
for(i= ending; i>=start; i--) |
1277 |
|
push_int(env, i); |
1278 |
|
} else { |
1279 |
|
for(i= ending; i<=start; i++) |
1280 |
|
push_int(env, i); |
1281 |
|
} |
1282 |
|
|
1283 |
|
temp_val= new_val(env); |
1284 |
|
temp_val->content.ptr= env->head; |
1285 |
|
temp_val->type= list; |
1286 |
|
env->head= temp_head; |
1287 |
|
push_val(env, temp_val); |
1288 |
|
} |
1289 |
|
|
1290 |
|
/* Read a string */ |
1291 |
|
extern void readline(environment *env) { |
1292 |
|
char in_string[101]; |
1293 |
|
|
1294 |
|
if(fgets(in_string, 100, env->inputstream)==NULL) |
1295 |
|
push_cstring(env, ""); |
1296 |
|
else |
1297 |
|
push_cstring(env, in_string); |
1298 |
|
} |
1299 |
|
|
1300 |
|
/* "read"; Read a value and place on stack */ |
1301 |
|
extern void sx_72656164(environment *env) { |
1302 |
|
const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%n"; |
1303 |
|
const char strform[]= "\"%[^\"]\"%n"; |
1304 |
|
const char intform[]= "%i%n"; |
1305 |
|
const char blankform[]= "%*[ \t]%n"; |
1306 |
|
const char ebrackform[]= "%*1[]]%n"; |
1307 |
|
const char semicform[]= "%*1[;]%n"; |
1308 |
|
const char bbrackform[]= "%*1[[]%n"; |
1309 |
|
|
1310 |
|
int itemp, readlength= -1; |
1311 |
|
static int depth= 0; |
1312 |
|
char *match; |
1313 |
|
size_t inlength; |
1314 |
|
|
1315 |
|
if(env->in_string==NULL) { |
1316 |
|
if(depth > 0 && env->interactive) { |
1317 |
|
printf("]> "); |
1318 |
|
} |
1319 |
|
readline(env); if(env->err) return; |
1320 |
|
|
1321 |
|
if(((char *)(env->head->item->content.ptr))[0]=='\0'){ |
1322 |
|
env->err= 4; /* "" means EOF */ |
1323 |
|
return; |
1324 |
|
} |
1325 |
|
|
1326 |
|
env->in_string= malloc(strlen(env->head->item->content.ptr)+1); |
1327 |
|
env->free_string= env->in_string; /* Save the original pointer */ |
1328 |
|
strcpy(env->in_string, env->head->item->content.ptr); |
1329 |
|
toss(env); if(env->err) return; |
1330 |
|
} |
1331 |
|
|
1332 |
|
inlength= strlen(env->in_string)+1; |
1333 |
|
match= malloc(inlength); |
1334 |
|
|
1335 |
|
if(sscanf(env->in_string, blankform, &readlength)!=EOF |
1336 |
|
&& readlength != -1) { |
1337 |
|
; |
1338 |
|
} else if(sscanf(env->in_string, intform, &itemp, &readlength) != EOF |
1339 |
|
&& readlength != -1) { |
1340 |
|
push_int(env, itemp); |
1341 |
|
} else if(sscanf(env->in_string, strform, match, &readlength) != EOF |
1342 |
|
&& readlength != -1) { |
1343 |
|
push_cstring(env, match); |
1344 |
|
} else if(sscanf(env->in_string, symbform, match, &readlength) != EOF |
1345 |
|
&& readlength != -1) { |
1346 |
|
push_sym(env, match); |
1347 |
|
} else if(sscanf(env->in_string, ebrackform, &readlength) != EOF |
1348 |
|
&& readlength != -1) { |
1349 |
|
pack(env); if(env->err) return; |
1350 |
|
if(depth != 0) depth--; |
1351 |
|
} else if(sscanf(env->in_string, semicform, &readlength) != EOF |
1352 |
|
&& readlength != -1) { |
1353 |
|
push_sym(env, ";"); |
1354 |
|
} else if(sscanf(env->in_string, bbrackform, &readlength) != EOF |
1355 |
|
&& readlength != -1) { |
1356 |
|
push_sym(env, "["); |
1357 |
|
depth++; |
1358 |
|
} else { |
1359 |
|
free(env->free_string); |
1360 |
|
env->in_string = env->free_string = NULL; |
1361 |
|
} |
1362 |
|
if ( env->in_string != NULL) { |
1363 |
|
env->in_string += readlength; |
1364 |
|
} |
1365 |
|
|
1366 |
|
free(match); |
1367 |
|
|
1368 |
|
if(depth) |
1369 |
|
return sx_72656164(env); |
1370 |
|
} |