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} 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;

  *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:
    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 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	1.4	enum {value, string, ref, func, symbol} 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			stack_head= (stack_head)->next;
154			free(temp);
155			}
156
157
158			/* print_stack(stack); */
159			void print_st(stackitem* stack_head, long counter)
160			{
161			if(stack_head->next != NULL)
162			print_st(stack_head->next, counter+1);
163
164	teddy	1.2	switch(stack_head->type){
165			case value:
166	masse	1.1	printf("%ld: %d\n", counter, (int)stack_head->content.val);
167	teddy	1.2	break;
168			case string:
169	masse	1.1	printf("%ld: \"%s\"\n", counter, (char*)stack_head->content.ptr);
170	teddy	1.2	break;
171			case ref:
172	masse	1.6	printf("%ld: %s\n", counter, ((stackitem*)stack_head->content.ptr)->id);
173			break;
174	teddy	1.2	case func:
175	masse	1.4	case symbol:
176	masse	1.1	printf("%ld: %p\n", counter, stack_head->content.ptr);
177	teddy	1.2	break;
178			}
179	masse	1.1	}
180
181			extern void printstack(stackitem** stack_head)
182			{
183			if(*stack_head != NULL) {
184			print_st(*stack_head, 1);
185			printf("\n");
186			}
187			}
188
189
190			extern void eval(stackitem** stack_head)
191			{
192			funcp in_func;
193
194			if((stack_head)==NULL \|\| (stack_head)->type!=ref)
195			return;
196
197			if(((stackitem)(stack_head)->content.ptr)->type==func) {
198			in_func= (funcp)((stackitem)(stack_head)->content.ptr)->content.ptr;
199			toss(stack_head);
200			(*in_func)(stack_head);
201			return;
202			}
203			}
204
205			int stack_read(stackitem** stack_head, hashtbl in_hash, char* in_line)
206			{
207			char temp, rest;
208			int itemp;
209			size_t inlength= strlen(in_line)+1;
210			int convert= 0;
211
212			temp= malloc(inlength);
213			rest= malloc(inlength);
214
215			if((convert= sscanf(in_line, "\"%[^\"\n\r]\" %[^\n\r]", temp, rest)) >= 1)
216			push_cstring(stack_head, temp);
217			else if((convert= sscanf(in_line, "%d %[^\n\r]", &itemp, rest)) >= 1)
218			push_val(stack_head, itemp);
219			else if((convert= sscanf(in_line, "%[^ ;\n\r]%[^\n\r]", temp, rest)) >= 1)
220			push_ref(stack_head, in_hash, temp);
221			else if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest)) >= 1)
222			if(*temp==';')
223			eval(stack_head);
224
225			free(temp);
226
227			if(convert<2) {
228			free(rest);
229			return 0;
230			}
231
232			stack_read(stack_head, in_hash, rest);
233
234			free(rest);
235			return 1;
236			}
237
238			extern void print(stackitem** stack_head)
239			{
240			if((*stack_head)==NULL)
241			return;
242
243	teddy	1.5	switch((*stack_head)->type){
244			case value:
245	masse	1.1	printf("%d", (*stack_head)->content.val);
246	teddy	1.5	break;
247			case string:
248	masse	1.1	printf("%s", (char)(stack_head)->content.ptr);
249	teddy	1.5	break;
250	masse	1.6	case ref:
251			printf("%s", ((stackitem)(stack_head)->content.ptr)->id);
252			break;
253	teddy	1.5	case symbol:
254			default:
255	masse	1.1	printf("%p", (*stack_head)->content.ptr);
256	teddy	1.5	break;
257			}
258	masse	1.1
259			toss(stack_head);
260			}
261
262			extern void nl()
263			{
264			printf("\n");
265	teddy	1.5	}
266
267			extern void quit()
268			{
269			exit(EXIT_SUCCESS);
270	masse	1.1	}
271
272			int main()
273			{
274			stackitem* s= NULL;
275			hashtbl myhash;
276			char in_string[100];
277
278			init_hashtbl(myhash);
279
280			printf("okidok\n ");
281
282			while(fgets(in_string, 100, stdin) != NULL) {
283			stack_read(&s, myhash, in_string);
284			printf("okidok\n ");
285			}
286
287
288			return EXIT_SUCCESS;
289			}
290	teddy	1.3
291			/* Local Variables: */
292			/* compile-command:"make CFLAGS=\"-Wall -g -rdynamic -ldl\" stack" */
293			/* End: */