cvs/stack/stack.c

/* printf */
#include <stdio.h>
/* EXIT_SUCCESS */
#include <stdlib.h>
/* NULL */
#include <stddef.h>
#include <dlfcn.h>

#define HASHTBLSIZE 65536

typedef struct stack_item
{
  enum {value, string, ref, func} 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);
}

int push_ref(stackitem** stack_head, hashtbl in_hash, const char* in_string)
{
  void* handle;
  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) {
    handle= dlopen(NULL, RTLD_LAZY);
    symbol= dlsym(handle, in_string);
    if(dlerror()==NULL) {
      def_func(in_hash, symbol, 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);

  if(stack_head->type==value)
    printf("%ld: %d\n", counter, (int)stack_head->content.val);
  else if(stack_head->type==string)
    printf("%ld: \"%s\"\n", counter, (char*)stack_head->content.ptr);
  else
    printf("%ld: %p\n", counter, stack_head->content.ptr);
}

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;

  if((*stack_head)->type==value)
    printf("%d", (*stack_head)->content.val);
  else if((*stack_head)->type==string)
    printf("%s", (char*)(*stack_head)->content.ptr);
  else
    printf("%p", (*stack_head)->content.ptr);

  toss(stack_head);
}

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

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;
}
1	/* printf */
2	#include <stdio.h>
3	/* EXIT_SUCCESS */
4	#include <stdlib.h>
5	/* NULL */
6	#include <stddef.h>
7	#include <dlfcn.h>
8
9	#define HASHTBLSIZE 65536
10
11	typedef struct stack_item
12	{
13	enum {value, string, ref, func} type;
14	union {
15	void* ptr;
16	int val;
17	} content;
18
19	char* id;
20	struct stack_item* next;
21	} stackitem;
22
23
24	typedef stackitem* hashtbl[HASHTBLSIZE];
25	typedef void (funcp)(stackitem*);
26
27	void init_hashtbl(hashtbl out_hash)
28	{
29	long i;
30
31	for(i= 0; i<HASHTBLSIZE; i++)
32	out_hash[i]= NULL;
33	}
34
35	stackitem** hash(hashtbl in_hashtbl, const char* in_string)
36	{
37	long i= 0;
38	unsigned long out_hash= 0;
39	char key= 0;
40	stackitem** position;
41
42	while(1){
43	key= in_string[i++];
44	if(key=='\0')
45	break;
46	out_hash= out_hash*32+key;
47	}
48
49	out_hash= out_hash%HASHTBLSIZE;
50	position= &(in_hashtbl[out_hash]);
51
52	while(1){
53	if(*position==NULL)
54	return position;
55
56	if(strcmp(in_string, (*position)->id)==0)
57	return position;
58
59	position= &((*position)->next);
60	}
61	}
62
63
64	int push(stackitem** stack_head, stackitem* in_item)
65	{
66	in_item->next= *stack_head;
67	*stack_head= in_item;
68	return 1;
69	}
70
71	int push_val(stackitem** stack_head, int in_val)
72	{
73	stackitem* new_item= malloc(sizeof(stackitem));
74	new_item->content.val= in_val;
75	new_item->type= value;
76
77	push(stack_head, new_item);
78	return 1;
79	}
80
81	int push_cstring(stackitem** stack_head, const char* in_string)
82	{
83	stackitem* new_item= malloc(sizeof(stackitem));
84	new_item->content.ptr= malloc(strlen(in_string)+1);
85	strcpy(new_item->content.ptr, in_string);
86	new_item->type= string;
87
88	push(stack_head, new_item);
89	return 1;
90	}
91
92	int mk_hashentry(hashtbl in_hashtbl, stackitem* in_item, const char* id)
93	{
94	in_item->id= malloc(strlen(id)+1);
95
96	strcpy(in_item->id, id);
97	push(hash(in_hashtbl, id), in_item);
98
99	return 1;
100	}
101
102	void def_func(hashtbl in_hashtbl, funcp in_func, const char* id)
103	{
104	stackitem* temp= malloc(sizeof(stackitem));
105
106	temp->type= func;
107	temp->content.ptr= in_func;
108
109	mk_hashentry(in_hashtbl, temp, id);
110	}
111
112	int push_ref(stackitem** stack_head, hashtbl in_hash, const char* in_string)
113	{
114	void* handle;
115	void* symbol;
116
117	stackitem* new_item= malloc(sizeof(stackitem));
118	new_item->content.ptr= *hash(in_hash, in_string);
119	new_item->type= ref;
120
121	if(new_item->content.ptr==NULL) {
122	handle= dlopen(NULL, RTLD_LAZY);
123	symbol= dlsym(handle, in_string);
124	if(dlerror()==NULL) {
125	def_func(in_hash, symbol, in_string);
126	new_item->content.ptr= *hash(in_hash, in_string);
127	new_item->type= ref;
128	}
129	}
130
131	push(stack_head, new_item);
132	return 1;
133	}
134
135	extern void toss(stackitem** stack_head)
136	{
137	stackitem* temp= *stack_head;
138
139	stack_head= (stack_head)->next;
140	free(temp);
141	}
142
143
144	/* print_stack(stack); */
145	void print_st(stackitem* stack_head, long counter)
146	{
147	if(stack_head->next != NULL)
148	print_st(stack_head->next, counter+1);
149
150	if(stack_head->type==value)
151	printf("%ld: %d\n", counter, (int)stack_head->content.val);
152	else if(stack_head->type==string)
153	printf("%ld: \"%s\"\n", counter, (char*)stack_head->content.ptr);
154	else
155	printf("%ld: %p\n", counter, stack_head->content.ptr);
156	}
157
158	extern void printstack(stackitem** stack_head)
159	{
160	if(*stack_head != NULL) {
161	print_st(*stack_head, 1);
162	printf("\n");
163	}
164	}
165
166
167	extern void eval(stackitem** stack_head)
168	{
169	funcp in_func;
170
171	if((stack_head)==NULL \|\| (stack_head)->type!=ref)
172	return;
173
174	if(((stackitem)(stack_head)->content.ptr)->type==func) {
175	in_func= (funcp)((stackitem)(stack_head)->content.ptr)->content.ptr;
176	toss(stack_head);
177	(*in_func)(stack_head);
178	return;
179	}
180	}
181
182	int stack_read(stackitem** stack_head, hashtbl in_hash, char* in_line)
183	{
184	char temp, rest;
185	int itemp;
186	size_t inlength= strlen(in_line)+1;
187	int convert= 0;
188
189	temp= malloc(inlength);
190	rest= malloc(inlength);
191
192	if((convert= sscanf(in_line, "\"%[^\"\n\r]\" %[^\n\r]", temp, rest)) >= 1)
193	push_cstring(stack_head, temp);
194	else if((convert= sscanf(in_line, "%d %[^\n\r]", &itemp, rest)) >= 1)
195	push_val(stack_head, itemp);
196	else if((convert= sscanf(in_line, "%[^ ;\n\r]%[^\n\r]", temp, rest)) >= 1)
197	push_ref(stack_head, in_hash, temp);
198	else if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest)) >= 1)
199	if(*temp==';')
200	eval(stack_head);
201
202	free(temp);
203
204	if(convert<2) {
205	free(rest);
206	return 0;
207	}
208
209	stack_read(stack_head, in_hash, rest);
210
211	free(rest);
212	return 1;
213	}
214
215	extern void print(stackitem** stack_head)
216	{
217	if((*stack_head)==NULL)
218	return;
219
220	if((*stack_head)->type==value)
221	printf("%d", (*stack_head)->content.val);
222	else if((*stack_head)->type==string)
223	printf("%s", (char)(stack_head)->content.ptr);
224	else
225	printf("%p", (*stack_head)->content.ptr);
226
227	toss(stack_head);
228	}
229
230	extern void nl()
231	{
232	printf("\n");
233	}
234
235	int main()
236	{
237	stackitem* s= NULL;
238	hashtbl myhash;
239	char in_string[100];
240
241	init_hashtbl(myhash);
242
243	printf("okidok\n ");
244
245	while(fgets(in_string, 100, stdin) != NULL) {
246	stack_read(&s, myhash, in_string);
247	printf("okidok\n ");
248	}
249
250
251	return EXIT_SUCCESS;
252	}