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(handle==NULL)
    handle= dlopen(NULL, RTLD_LAZY);

  if(new_item->content.ptr==NULL) {
    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);
}


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

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

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 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;
  }

  toss(stack_head);
}

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

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 ");
  }


  return 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(handle==NULL)
132	handle= dlopen(NULL, RTLD_LAZY);
133
134	if(new_item->content.ptr==NULL) {
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
164	/* print_stack(stack); */
165	void print_st(stackitem* stack_head, long counter)
166	{
167	if(stack_head->next != NULL)
168	print_st(stack_head->next, counter+1);
169
170	switch(stack_head->type){
171	case value:
172	printf("%ld: %d\n", counter, (int)stack_head->content.val);
173	break;
174	case string:
175	printf("%ld: \"%s\"\n", counter, (char*)stack_head->content.ptr);
176	break;
177	case ref:
178	printf("%ld: %s\n", counter, ((stackitem*)stack_head->content.ptr)->id);
179	break;
180	case func:
181	case symbol:
182	default:
183	printf("%ld: %p\n", counter, stack_head->content.ptr);
184	break;
185	}
186	}
187
188	extern void printstack(stackitem** stack_head)
189	{
190	if(*stack_head != NULL) {
191	print_st(*stack_head, 1);
192	printf("\n");
193	}
194	}
195
196
197	extern void eval(stackitem** stack_head)
198	{
199	funcp in_func;
200
201	if((stack_head)==NULL \|\| (stack_head)->type!=ref)
202	return;
203
204	if(((stackitem)(stack_head)->content.ptr)->type==func) {
205	in_func= (funcp)((stackitem)(stack_head)->content.ptr)->content.ptr;
206	toss(stack_head);
207	(*in_func)(stack_head);
208	return;
209	}
210	}
211
212	int stack_read(stackitem** stack_head, hashtbl in_hash, char* in_line)
213	{
214	char temp, rest;
215	int itemp;
216	size_t inlength= strlen(in_line)+1;
217	int convert= 0;
218
219	temp= malloc(inlength);
220	rest= malloc(inlength);
221
222	if((convert= sscanf(in_line, "\"%[^\"\n\r]\" %[^\n\r]", temp, rest)) >= 1)
223	push_cstring(stack_head, temp);
224	else if((convert= sscanf(in_line, "%d %[^\n\r]", &itemp, rest)) >= 1)
225	push_val(stack_head, itemp);
226	else if((convert= sscanf(in_line, "%[^ ;\n\r]%[^\n\r]", temp, rest)) >= 1)
227	push_ref(stack_head, in_hash, temp);
228	else if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest)) >= 1)
229	if(*temp==';')
230	eval(stack_head);
231
232	free(temp);
233
234	if(convert<2) {
235	free(rest);
236	return 0;
237	}
238
239	stack_read(stack_head, in_hash, rest);
240
241	free(rest);
242	return 1;
243	}
244
245	extern void print(stackitem** stack_head)
246	{
247	if((*stack_head)==NULL)
248	return;
249
250	switch((*stack_head)->type){
251	case value:
252	printf("%d", (*stack_head)->content.val);
253	break;
254	case string:
255	printf("%s", (char)(stack_head)->content.ptr);
256	break;
257	case ref:
258	printf("%s", ((stackitem)(stack_head)->content.ptr)->id);
259	break;
260	case symbol:
261	default:
262	printf("%p", (*stack_head)->content.ptr);
263	break;
264	}
265
266	toss(stack_head);
267	}
268
269	extern void pack(stackitem** stack_head)
270	{
271	void* delimiter;
272	stackitem iterator, temp, *pack;
273
274	if((*stack_head)==NULL)
275	return;
276
277	delimiter= (*stack_head)->content.ptr;
278	toss(stack_head);
279
280	iterator= *stack_head;
281
282	while(iterator->next!=NULL && iterator->next->content.ptr!=delimiter)
283	iterator= iterator->next;
284
285	temp= *stack_head;
286	*stack_head= iterator->next;
287	iterator->next= NULL;
288
289	if(stack_head!=NULL && (stack_head)->content.ptr==delimiter)
290	toss(stack_head);
291
292	pack= malloc(sizeof(stackitem));
293	pack->type= list;
294	pack->content.ptr= temp;
295
296	push(stack_head, pack);
297	}
298
299
300	extern void nl()
301	{
302	printf("\n");
303	}
304
305	extern void quit()
306	{
307	exit(EXIT_SUCCESS);
308	}
309
310	int main()
311	{
312	stackitem* s= NULL;
313	hashtbl myhash;
314	char in_string[100];
315
316	init_hashtbl(myhash);
317
318	printf("okidok\n ");
319
320	while(fgets(in_string, 100, stdin) != NULL) {
321	stack_read(&s, myhash, in_string);
322	printf("okidok\n ");
323	}
324
325
326	return EXIT_SUCCESS;
327	}
328
329	/* Local Variables: */
330	/* compile-command:"make CFLAGS=\"-Wall -g -rdynamic -ldl\" stack" */
331	/* End: */