cvs/stack/stack.c

/* printf */
#include <stdio.h>
/* EXIT_SUCCESS */
#include <stdlib.h>
/* NULL */
#include <stddef.h>
/* dlopen, dlsym, dlerror */
#include <dlfcn.h>

#define HASHTBLSIZE 65536

typedef struct stack_item
{
  enum {value, string, ref, func, symbol, list} type;
  union {
    void* ptr;
    int val;
  } content;

  char* id;
  struct stack_item* next;
} stackitem;


typedef stackitem* hashtbl[HASHTBLSIZE];
typedef void (*funcp)(stackitem**);

void init_hashtbl(hashtbl out_hash)
{
  long i;

  for(i= 0; i<HASHTBLSIZE; i++)
    out_hash[i]= NULL;
}

stackitem** hash(hashtbl in_hashtbl, const char* in_string)
{
  long i= 0;
  unsigned long out_hash= 0;
  char key= 0;
  stackitem** position;
  
  while(1){
    key= in_string[i++];
    if(key=='\0')
      break;
    out_hash= out_hash*32+key;
  }

  out_hash= out_hash%HASHTBLSIZE;
  position= &(in_hashtbl[out_hash]);

  while(1){
    if(*position==NULL)
      return position;
    
    if(strcmp(in_string, (*position)->id)==0)
      return position;

    position= &((*position)->next);
  }
}


int push(stackitem** stack_head, stackitem* in_item)
{
  in_item->next= *stack_head;
  *stack_head= in_item;
  return 1;
}

int push_val(stackitem** stack_head, int in_val) 
{
  stackitem* new_item= malloc(sizeof(stackitem));
  new_item->content.val= in_val;
  new_item->type= value;

  push(stack_head, new_item);
  return 1;
}

int push_cstring(stackitem** stack_head, const char* in_string)
{
  stackitem* new_item= malloc(sizeof(stackitem));
  new_item->content.ptr= malloc(strlen(in_string)+1);
  strcpy(new_item->content.ptr, in_string);
  new_item->type= string;

  push(stack_head, new_item);
  return 1;
}

int mk_hashentry(hashtbl in_hashtbl, stackitem* in_item, const char* id)
{
  in_item->id= malloc(strlen(id)+1);

  strcpy(in_item->id, id);
  push(hash(in_hashtbl, id), in_item);

  return 1;
}

void def_func(hashtbl in_hashtbl, funcp in_func, const char* id)
{
  stackitem* temp= malloc(sizeof(stackitem));

  temp->type= func;
  temp->content.ptr= in_func;

  mk_hashentry(in_hashtbl, temp, id);
}

void def_sym(hashtbl in_hashtbl, const char* id)
{
  stackitem* temp= malloc(sizeof(stackitem));
  
  temp->type= symbol;

  mk_hashentry(in_hashtbl, temp, id);
}

int push_ref(stackitem** stack_head, hashtbl in_hash, const char* in_string)
{
  static void* handle= NULL;
  void* symbol;

  stackitem* new_item= malloc(sizeof(stackitem));
  new_item->content.ptr= *hash(in_hash, in_string);
  new_item->type= ref;

  if(new_item->content.ptr==NULL) {
    if(handle==NULL)
      handle= dlopen(NULL, RTLD_LAZY);    

    symbol= dlsym(handle, in_string);
    if(dlerror()==NULL) 
      def_func(in_hash, symbol, in_string);
    else
      def_sym(in_hash, in_string);
      
    new_item->content.ptr= *hash(in_hash, in_string);
    new_item->type= ref;
  }

  push(stack_head, new_item);
  return 1;
}

extern void toss(stackitem** stack_head)
{
  stackitem* temp= *stack_head;

  if((*stack_head)==NULL)
    return;
  
  if((*stack_head)->type==string)
    free((*stack_head)->content.ptr);

  *stack_head= (*stack_head)->next;
  free(temp);
}

extern void nl()
{
  printf("\n");
}

void print_(stackitem** stack_head)
{
  if((*stack_head)==NULL)
    return;

  switch((*stack_head)->type) {
  case value:
    printf("%d", (*stack_head)->content.val);
    break;
  case string:
    printf("%s", (char*)(*stack_head)->content.ptr);
    break;
  case ref:
    printf("%s", ((stackitem*)(*stack_head)->content.ptr)->id);
    break;
  case symbol:
  default:
    printf("%p", (*stack_head)->content.ptr);
    break;
  }
}

extern void print(stackitem** stack_head)
{
  print_(stack_head);
  toss(stack_head);
}

/* print_stack(stack); */
void print_st(stackitem* stack_head, long counter)
{ 
  if(stack_head->next != NULL)
    print_st(stack_head->next, counter+1);

  printf("%ld: ", counter);
  print_(&stack_head);
  nl();
}

extern void printstack(stackitem** stack_head)
{
  if(*stack_head != NULL) {
    print_st(*stack_head, 1);
    printf("\n");
  }
}


extern void eval(stackitem** stack_head)
{
  funcp in_func;

  if((*stack_head)==NULL || (*stack_head)->type!=ref)
    return;

  if(((stackitem*)(*stack_head)->content.ptr)->type==func) {
    in_func= (funcp)((stackitem*)(*stack_head)->content.ptr)->content.ptr;
    toss(stack_head); 
    (*in_func)(stack_head);
    return;
  }
}

int stack_read(stackitem** stack_head, hashtbl in_hash, char* in_line) 
{
  char *temp, *rest;
  int itemp;
  size_t inlength= strlen(in_line)+1;
  int convert= 0;

  temp= malloc(inlength);
  rest= malloc(inlength);

  if((convert= sscanf(in_line, "\"%[^\"\n\r]\" %[^\n\r]", temp, rest)) >= 1)
    push_cstring(stack_head, temp);
  else if((convert= sscanf(in_line, "%d %[^\n\r]", &itemp, rest)) >= 1)
    push_val(stack_head, itemp);
  else if((convert= sscanf(in_line, "%[^ ;\n\r]%[^\n\r]", temp, rest)) >= 1) 
    push_ref(stack_head, in_hash, temp);
  else if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest)) >= 1)
    if(*temp==';')
      eval(stack_head);

  free(temp);

  if(convert<2) {
    free(rest);
    return 0;
  }
   
  stack_read(stack_head, in_hash, rest);
  
  free(rest);
  return 1;
}

extern void pack(stackitem** stack_head)
{
  void* delimiter;
  stackitem *iterator, *temp, *pack;

  if((*stack_head)==NULL)
    return;

  delimiter= (*stack_head)->content.ptr;
  toss(stack_head);

  iterator= *stack_head;

  while(iterator->next!=NULL && iterator->next->content.ptr!=delimiter)
    iterator= iterator->next;

  temp= *stack_head;
  *stack_head= iterator->next;
  iterator->next= NULL;
  
  if(*stack_head!=NULL && (*stack_head)->content.ptr==delimiter)
    toss(stack_head);

  pack= malloc(sizeof(stackitem));
  pack->type= list;
  pack->content.ptr= temp;

  push(stack_head, pack);
}

extern void expand(stackitem** stack_head)
{
  stackitem *temp, *new_head;

  if((*stack_head)==NULL || (*stack_head)->type!=list)
    return;

  new_head= temp= (*stack_head)->content.ptr;
  toss(stack_head);

  while(temp->next!=NULL)
    temp= temp->next;

  temp->next= *stack_head;
  *stack_head= new_head;
}

extern void swap(stackitem** stack_head)
{
  stackitem* temp= (*stack_head);
  
  if((*stack_head)==NULL || (*stack_head)->next==NULL)
    return;

  *stack_head= (*stack_head)->next;
  temp->next= (*stack_head)->next;
  (*stack_head)->next= temp;
} 

extern void eq(stackitem** stack_head)
{
  void *left, *right;
  int result;

  if((*stack_head)==NULL || (*stack_head)->next==NULL)
    return;

  left= (*stack_head)->content.ptr;
  swap(stack_head);
  right= (*stack_head)->content.ptr;
  result= (left==right);
  
  toss(stack_head); toss(stack_head);
  push_val(stack_head, (left==right));
}

extern void not(stackitem** stack_head)
{
  int value;

  if((*stack_head)==NULL)
    return;

  value= (*stack_head)->content.val;
  toss(stack_head);
  push_val(stack_head, !value);
}

extern void neq(stackitem** stack_head)
{
  eq(stack_head);
  not(stack_head);
}

extern void def(stackitem** stack_head)
{
  stackitem *temp, *value;

  if(*stack_head==NULL || (*stack_head)->next==NULL 
     || (*stack_head)->type!=ref)
    return;

  temp= (*stack_head)->content.ptr;
  value= (*stack_head)->next;
  temp->content= value->content;
  value->content.ptr=NULL;
  temp->type= value->type;

  toss(stack_head); toss(stack_head);
} 

extern void quit()
{
  exit(EXIT_SUCCESS);
}

int main()
{
  stackitem* s= NULL;
  hashtbl myhash;
  char in_string[100];

  init_hashtbl(myhash);

  printf("okidok\n ");

  while(fgets(in_string, 100, stdin) != NULL) {
    stack_read(&s, myhash, in_string);
    printf("okidok\n ");
  }

  exit(EXIT_SUCCESS);
}

/* Local Variables: */
/* compile-command:"make CFLAGS=\"-Wall -g -rdynamic -ldl\" stack" */
/* End: */
1	/* printf */
2	#include <stdio.h>
3	/* EXIT_SUCCESS */
4	#include <stdlib.h>
5	/* NULL */
6	#include <stddef.h>
7	/* dlopen, dlsym, dlerror */
8	#include <dlfcn.h>
9
10	#define HASHTBLSIZE 65536
11
12	typedef struct stack_item
13	{
14	enum {value, string, ref, func, symbol, list} type;
15	union {
16	void* ptr;
17	int val;
18	} content;
19
20	char* id;
21	struct stack_item* next;
22	} stackitem;
23
24
25	typedef stackitem* hashtbl[HASHTBLSIZE];
26	typedef void (funcp)(stackitem*);
27
28	void init_hashtbl(hashtbl out_hash)
29	{
30	long i;
31
32	for(i= 0; i<HASHTBLSIZE; i++)
33	out_hash[i]= NULL;
34	}
35
36	stackitem** hash(hashtbl in_hashtbl, const char* in_string)
37	{
38	long i= 0;
39	unsigned long out_hash= 0;
40	char key= 0;
41	stackitem** position;
42
43	while(1){
44	key= in_string[i++];
45	if(key=='\0')
46	break;
47	out_hash= out_hash*32+key;
48	}
49
50	out_hash= out_hash%HASHTBLSIZE;
51	position= &(in_hashtbl[out_hash]);
52
53	while(1){
54	if(*position==NULL)
55	return position;
56
57	if(strcmp(in_string, (*position)->id)==0)
58	return position;
59
60	position= &((*position)->next);
61	}
62	}
63
64
65	int push(stackitem** stack_head, stackitem* in_item)
66	{
67	in_item->next= *stack_head;
68	*stack_head= in_item;
69	return 1;
70	}
71
72	int push_val(stackitem** stack_head, int in_val)
73	{
74	stackitem* new_item= malloc(sizeof(stackitem));
75	new_item->content.val= in_val;
76	new_item->type= value;
77
78	push(stack_head, new_item);
79	return 1;
80	}
81
82	int push_cstring(stackitem** stack_head, const char* in_string)
83	{
84	stackitem* new_item= malloc(sizeof(stackitem));
85	new_item->content.ptr= malloc(strlen(in_string)+1);
86	strcpy(new_item->content.ptr, in_string);
87	new_item->type= string;
88
89	push(stack_head, new_item);
90	return 1;
91	}
92
93	int mk_hashentry(hashtbl in_hashtbl, stackitem* in_item, const char* id)
94	{
95	in_item->id= malloc(strlen(id)+1);
96
97	strcpy(in_item->id, id);
98	push(hash(in_hashtbl, id), in_item);
99
100	return 1;
101	}
102
103	void def_func(hashtbl in_hashtbl, funcp in_func, const char* id)
104	{
105	stackitem* temp= malloc(sizeof(stackitem));
106
107	temp->type= func;
108	temp->content.ptr= in_func;
109
110	mk_hashentry(in_hashtbl, temp, id);
111	}
112
113	void def_sym(hashtbl in_hashtbl, const char* id)
114	{
115	stackitem* temp= malloc(sizeof(stackitem));
116
117	temp->type= symbol;
118
119	mk_hashentry(in_hashtbl, temp, id);
120	}
121
122	int push_ref(stackitem** stack_head, hashtbl in_hash, const char* in_string)
123	{
124	static void* handle= NULL;
125	void* symbol;
126
127	stackitem* new_item= malloc(sizeof(stackitem));
128	new_item->content.ptr= *hash(in_hash, in_string);
129	new_item->type= ref;
130
131	if(new_item->content.ptr==NULL) {
132	if(handle==NULL)
133	handle= dlopen(NULL, RTLD_LAZY);
134
135	symbol= dlsym(handle, in_string);
136	if(dlerror()==NULL)
137	def_func(in_hash, symbol, in_string);
138	else
139	def_sym(in_hash, in_string);
140
141	new_item->content.ptr= *hash(in_hash, in_string);
142	new_item->type= ref;
143	}
144
145	push(stack_head, new_item);
146	return 1;
147	}
148
149	extern void toss(stackitem** stack_head)
150	{
151	stackitem* temp= *stack_head;
152
153	if((*stack_head)==NULL)
154	return;
155
156	if((*stack_head)->type==string)
157	free((*stack_head)->content.ptr);
158
159	stack_head= (stack_head)->next;
160	free(temp);
161	}
162
163	extern void nl()
164	{
165	printf("\n");
166	}
167
168	void print_(stackitem** stack_head)
169	{
170	if((*stack_head)==NULL)
171	return;
172
173	switch((*stack_head)->type) {
174	case value:
175	printf("%d", (*stack_head)->content.val);
176	break;
177	case string:
178	printf("%s", (char)(stack_head)->content.ptr);
179	break;
180	case ref:
181	printf("%s", ((stackitem)(stack_head)->content.ptr)->id);
182	break;
183	case symbol:
184	default:
185	printf("%p", (*stack_head)->content.ptr);
186	break;
187	}
188	}
189
190	extern void print(stackitem** stack_head)
191	{
192	print_(stack_head);
193	toss(stack_head);
194	}
195
196	/* print_stack(stack); */
197	void print_st(stackitem* stack_head, long counter)
198	{
199	if(stack_head->next != NULL)
200	print_st(stack_head->next, counter+1);
201
202	printf("%ld: ", counter);
203	print_(&stack_head);
204	nl();
205	}
206
207	extern void printstack(stackitem** stack_head)
208	{
209	if(*stack_head != NULL) {
210	print_st(*stack_head, 1);
211	printf("\n");
212	}
213	}
214
215
216	extern void eval(stackitem** stack_head)
217	{
218	funcp in_func;
219
220	if((stack_head)==NULL \|\| (stack_head)->type!=ref)
221	return;
222
223	if(((stackitem)(stack_head)->content.ptr)->type==func) {
224	in_func= (funcp)((stackitem)(stack_head)->content.ptr)->content.ptr;
225	toss(stack_head);
226	(*in_func)(stack_head);
227	return;
228	}
229	}
230
231	int stack_read(stackitem** stack_head, hashtbl in_hash, char* in_line)
232	{
233	char temp, rest;
234	int itemp;
235	size_t inlength= strlen(in_line)+1;
236	int convert= 0;
237
238	temp= malloc(inlength);
239	rest= malloc(inlength);
240
241	if((convert= sscanf(in_line, "\"%[^\"\n\r]\" %[^\n\r]", temp, rest)) >= 1)
242	push_cstring(stack_head, temp);
243	else if((convert= sscanf(in_line, "%d %[^\n\r]", &itemp, rest)) >= 1)
244	push_val(stack_head, itemp);
245	else if((convert= sscanf(in_line, "%[^ ;\n\r]%[^\n\r]", temp, rest)) >= 1)
246	push_ref(stack_head, in_hash, temp);
247	else if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest)) >= 1)
248	if(*temp==';')
249	eval(stack_head);
250
251	free(temp);
252
253	if(convert<2) {
254	free(rest);
255	return 0;
256	}
257
258	stack_read(stack_head, in_hash, rest);
259
260	free(rest);
261	return 1;
262	}
263
264	extern void pack(stackitem** stack_head)
265	{
266	void* delimiter;
267	stackitem iterator, temp, *pack;
268
269	if((*stack_head)==NULL)
270	return;
271
272	delimiter= (*stack_head)->content.ptr;
273	toss(stack_head);
274
275	iterator= *stack_head;
276
277	while(iterator->next!=NULL && iterator->next->content.ptr!=delimiter)
278	iterator= iterator->next;
279
280	temp= *stack_head;
281	*stack_head= iterator->next;
282	iterator->next= NULL;
283
284	if(stack_head!=NULL && (stack_head)->content.ptr==delimiter)
285	toss(stack_head);
286
287	pack= malloc(sizeof(stackitem));
288	pack->type= list;
289	pack->content.ptr= temp;
290
291	push(stack_head, pack);
292	}
293
294	extern void expand(stackitem** stack_head)
295	{
296	stackitem temp, new_head;
297
298	if((stack_head)==NULL \|\| (stack_head)->type!=list)
299	return;
300
301	new_head= temp= (*stack_head)->content.ptr;
302	toss(stack_head);
303
304	while(temp->next!=NULL)
305	temp= temp->next;
306
307	temp->next= *stack_head;
308	*stack_head= new_head;
309	}
310
311	extern void swap(stackitem** stack_head)
312	{
313	stackitem* temp= (*stack_head);
314
315	if((stack_head)==NULL \|\| (stack_head)->next==NULL)
316	return;
317
318	stack_head= (stack_head)->next;
319	temp->next= (*stack_head)->next;
320	(*stack_head)->next= temp;
321	}
322
323	extern void eq(stackitem** stack_head)
324	{
325	void left, right;
326	int result;
327
328	if((stack_head)==NULL \|\| (stack_head)->next==NULL)
329	return;
330
331	left= (*stack_head)->content.ptr;
332	swap(stack_head);
333	right= (*stack_head)->content.ptr;
334	result= (left==right);
335
336	toss(stack_head); toss(stack_head);
337	push_val(stack_head, (left==right));
338	}
339
340	extern void not(stackitem** stack_head)
341	{
342	int value;
343
344	if((*stack_head)==NULL)
345	return;
346
347	value= (*stack_head)->content.val;
348	toss(stack_head);
349	push_val(stack_head, !value);
350	}
351
352	extern void neq(stackitem** stack_head)
353	{
354	eq(stack_head);
355	not(stack_head);
356	}
357
358	extern void def(stackitem** stack_head)
359	{
360	stackitem temp, value;
361
362	if(stack_head==NULL \|\| (stack_head)->next==NULL
363	\|\| (*stack_head)->type!=ref)
364	return;
365
366	temp= (*stack_head)->content.ptr;
367	value= (*stack_head)->next;
368	temp->content= value->content;
369	value->content.ptr=NULL;
370	temp->type= value->type;
371
372	toss(stack_head); toss(stack_head);
373	}
374
375	extern void quit()
376	{
377	exit(EXIT_SUCCESS);
378	}
379
380	int main()
381	{
382	stackitem* s= NULL;
383	hashtbl myhash;
384	char in_string[100];
385
386	init_hashtbl(myhash);
387
388	printf("okidok\n ");
389
390	while(fgets(in_string, 100, stdin) != NULL) {
391	stack_read(&s, myhash, in_string);
392	printf("okidok\n ");
393	}
394
395	exit(EXIT_SUCCESS);
396	}
397
398	/* Local Variables: */
399	/* compile-command:"make CFLAGS=\"-Wall -g -rdynamic -ldl\" stack" */
400	/* End: */