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);

  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;
}
1	masse	1.1	/* 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	teddy	1.2	switch(stack_head->type){
151			case value:
152	masse	1.1	printf("%ld: %d\n", counter, (int)stack_head->content.val);
153	teddy	1.2	break;
154			case string:
155	masse	1.1	printf("%ld: \"%s\"\n", counter, (char*)stack_head->content.ptr);
156	teddy	1.2	break;
157			case ref:
158			case func:
159	masse	1.1	printf("%ld: %p\n", counter, stack_head->content.ptr);
160	teddy	1.2	break;
161			}
162	masse	1.1	}
163
164			extern void printstack(stackitem** stack_head)
165			{
166			if(*stack_head != NULL) {
167			print_st(*stack_head, 1);
168			printf("\n");
169			}
170			}
171
172
173			extern void eval(stackitem** stack_head)
174			{
175			funcp in_func;
176
177			if((stack_head)==NULL \|\| (stack_head)->type!=ref)
178			return;
179
180			if(((stackitem)(stack_head)->content.ptr)->type==func) {
181			in_func= (funcp)((stackitem)(stack_head)->content.ptr)->content.ptr;
182			toss(stack_head);
183			(*in_func)(stack_head);
184			return;
185			}
186			}
187
188			int stack_read(stackitem** stack_head, hashtbl in_hash, char* in_line)
189			{
190			char temp, rest;
191			int itemp;
192			size_t inlength= strlen(in_line)+1;
193			int convert= 0;
194
195			temp= malloc(inlength);
196			rest= malloc(inlength);
197
198			if((convert= sscanf(in_line, "\"%[^\"\n\r]\" %[^\n\r]", temp, rest)) >= 1)
199			push_cstring(stack_head, temp);
200			else if((convert= sscanf(in_line, "%d %[^\n\r]", &itemp, rest)) >= 1)
201			push_val(stack_head, itemp);
202			else if((convert= sscanf(in_line, "%[^ ;\n\r]%[^\n\r]", temp, rest)) >= 1)
203			push_ref(stack_head, in_hash, temp);
204			else if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest)) >= 1)
205			if(*temp==';')
206			eval(stack_head);
207
208			free(temp);
209
210			if(convert<2) {
211			free(rest);
212			return 0;
213			}
214
215			stack_read(stack_head, in_hash, rest);
216
217			free(rest);
218			return 1;
219			}
220
221			extern void print(stackitem** stack_head)
222			{
223			if((*stack_head)==NULL)
224			return;
225
226			if((*stack_head)->type==value)
227			printf("%d", (*stack_head)->content.val);
228			else if((*stack_head)->type==string)
229			printf("%s", (char)(stack_head)->content.ptr);
230			else
231			printf("%p", (*stack_head)->content.ptr);
232
233			toss(stack_head);
234			}
235
236			extern void nl()
237			{
238			printf("\n");
239			}
240
241			int main()
242			{
243			stackitem* s= NULL;
244			hashtbl myhash;
245			char in_string[100];
246
247			init_hashtbl(myhash);
248
249			printf("okidok\n ");
250
251			while(fgets(in_string, 100, stdin) != NULL) {
252			stack_read(&s, myhash, in_string);
253			printf("okidok\n ");
254			}
255
256
257			return EXIT_SUCCESS;
258			}