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} 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);

  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:
  case func:
    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;

  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;
}

/* 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} 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	int push_ref(stackitem** stack_head, hashtbl in_hash, const char* in_string)
114	{
115	void* handle;
116	void* symbol;
117
118	stackitem* new_item= malloc(sizeof(stackitem));
119	new_item->content.ptr= *hash(in_hash, in_string);
120	new_item->type= ref;
121
122	if(new_item->content.ptr==NULL) {
123	handle= dlopen(NULL, RTLD_LAZY);
124	symbol= dlsym(handle, in_string);
125	if(dlerror()==NULL) {
126	def_func(in_hash, symbol, in_string);
127	new_item->content.ptr= *hash(in_hash, in_string);
128	new_item->type= ref;
129	}
130	}
131
132	push(stack_head, new_item);
133	return 1;
134	}
135
136	extern void toss(stackitem** stack_head)
137	{
138	stackitem* temp= *stack_head;
139
140	stack_head= (stack_head)->next;
141	free(temp);
142	}
143
144
145	/* print_stack(stack); */
146	void print_st(stackitem* stack_head, long counter)
147	{
148	if(stack_head->next != NULL)
149	print_st(stack_head->next, counter+1);
150
151	switch(stack_head->type){
152	case value:
153	printf("%ld: %d\n", counter, (int)stack_head->content.val);
154	break;
155	case string:
156	printf("%ld: \"%s\"\n", counter, (char*)stack_head->content.ptr);
157	break;
158	case ref:
159	case func:
160	printf("%ld: %p\n", counter, stack_head->content.ptr);
161	break;
162	}
163	}
164
165	extern void printstack(stackitem** stack_head)
166	{
167	if(*stack_head != NULL) {
168	print_st(*stack_head, 1);
169	printf("\n");
170	}
171	}
172
173
174	extern void eval(stackitem** stack_head)
175	{
176	funcp in_func;
177
178	if((stack_head)==NULL \|\| (stack_head)->type!=ref)
179	return;
180
181	if(((stackitem)(stack_head)->content.ptr)->type==func) {
182	in_func= (funcp)((stackitem)(stack_head)->content.ptr)->content.ptr;
183	toss(stack_head);
184	(*in_func)(stack_head);
185	return;
186	}
187	}
188
189	int stack_read(stackitem** stack_head, hashtbl in_hash, char* in_line)
190	{
191	char temp, rest;
192	int itemp;
193	size_t inlength= strlen(in_line)+1;
194	int convert= 0;
195
196	temp= malloc(inlength);
197	rest= malloc(inlength);
198
199	if((convert= sscanf(in_line, "\"%[^\"\n\r]\" %[^\n\r]", temp, rest)) >= 1)
200	push_cstring(stack_head, temp);
201	else if((convert= sscanf(in_line, "%d %[^\n\r]", &itemp, rest)) >= 1)
202	push_val(stack_head, itemp);
203	else if((convert= sscanf(in_line, "%[^ ;\n\r]%[^\n\r]", temp, rest)) >= 1)
204	push_ref(stack_head, in_hash, temp);
205	else if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest)) >= 1)
206	if(*temp==';')
207	eval(stack_head);
208
209	free(temp);
210
211	if(convert<2) {
212	free(rest);
213	return 0;
214	}
215
216	stack_read(stack_head, in_hash, rest);
217
218	free(rest);
219	return 1;
220	}
221
222	extern void print(stackitem** stack_head)
223	{
224	if((*stack_head)==NULL)
225	return;
226
227	if((*stack_head)->type==value)
228	printf("%d", (*stack_head)->content.val);
229	else if((*stack_head)->type==string)
230	printf("%s", (char)(stack_head)->content.ptr);
231	else
232	printf("%p", (*stack_head)->content.ptr);
233
234	toss(stack_head);
235	}
236
237	extern void nl()
238	{
239	printf("\n");
240	}
241
242	int main()
243	{
244	stackitem* s= NULL;
245	hashtbl myhash;
246	char in_string[100];
247
248	init_hashtbl(myhash);
249
250	printf("okidok\n ");
251
252	while(fgets(in_string, 100, stdin) != NULL) {
253	stack_read(&s, myhash, in_string);
254	printf("okidok\n ");
255	}
256
257
258	return EXIT_SUCCESS;
259	}
260
261	/* Local Variables: */
262	/* compile-command:"make CFLAGS=\"-Wall -g -rdynamic -ldl\" stack" */
263	/* End: */