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	masse	1.1	/* printf */
2			#include <stdio.h>
3			/* EXIT_SUCCESS */
4			#include <stdlib.h>
5			/* NULL */
6			#include <stddef.h>
7	teddy	1.3	/* dlopen, dlsym, dlerror */
8	masse	1.1	#include <dlfcn.h>
9
10			#define HASHTBLSIZE 65536
11
12			typedef struct stack_item
13			{
14	masse	1.7	enum {value, string, ref, func, symbol, list} type;
15	masse	1.1	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	masse	1.4	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	masse	1.1	int push_ref(stackitem** stack_head, hashtbl in_hash, const char* in_string)
123			{
124	masse	1.6	static void* handle= NULL;
125	masse	1.1	void* symbol;
126	masse	1.6
127	masse	1.1	stackitem* new_item= malloc(sizeof(stackitem));
128			new_item->content.ptr= *hash(in_hash, in_string);
129			new_item->type= ref;
130
131	masse	1.6	if(handle==NULL)
132			handle= dlopen(NULL, RTLD_LAZY);
133
134	masse	1.1	if(new_item->content.ptr==NULL) {
135			symbol= dlsym(handle, in_string);
136	masse	1.4	if(dlerror()==NULL)
137	masse	1.1	def_func(in_hash, symbol, in_string);
138	masse	1.4	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	masse	1.1	}
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	masse	1.7	if((*stack_head)==NULL)
154			return;
155
156			if((*stack_head)->type==string)
157			free((*stack_head)->content.ptr);
158
159	masse	1.1	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	teddy	1.2	switch(stack_head->type){
171			case value:
172	masse	1.1	printf("%ld: %d\n", counter, (int)stack_head->content.val);
173	teddy	1.2	break;
174			case string:
175	masse	1.1	printf("%ld: \"%s\"\n", counter, (char*)stack_head->content.ptr);
176	teddy	1.2	break;
177			case ref:
178	masse	1.6	printf("%ld: %s\n", counter, ((stackitem*)stack_head->content.ptr)->id);
179			break;
180	teddy	1.2	case func:
181	masse	1.4	case symbol:
182	masse	1.7	default:
183	masse	1.1	printf("%ld: %p\n", counter, stack_head->content.ptr);
184	teddy	1.2	break;
185			}
186	masse	1.1	}
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	teddy	1.5	switch((*stack_head)->type){
251			case value:
252	masse	1.1	printf("%d", (*stack_head)->content.val);
253	teddy	1.5	break;
254			case string:
255	masse	1.1	printf("%s", (char)(stack_head)->content.ptr);
256	teddy	1.5	break;
257	masse	1.6	case ref:
258			printf("%s", ((stackitem)(stack_head)->content.ptr)->id);
259			break;
260	teddy	1.5	case symbol:
261			default:
262	masse	1.1	printf("%p", (*stack_head)->content.ptr);
263	teddy	1.5	break;
264			}
265	masse	1.1
266			toss(stack_head);
267			}
268	masse	1.7
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	masse	1.1
300			extern void nl()
301			{
302			printf("\n");
303	teddy	1.5	}
304
305			extern void quit()
306			{
307			exit(EXIT_SUCCESS);
308	masse	1.1	}
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	teddy	1.3
329			/* Local Variables: */
330			/* compile-command:"make CFLAGS=\"-Wall -g -rdynamic -ldl\" stack" */
331			/* End: */