/[cvs]/stack/stack.c
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revision 1.17 by masse, Thu Jan 31 23:09:07 2002 UTC revision 1.18 by teddy, Fri Feb 1 23:30:55 2002 UTC
# Line 6  Line 6 
6  #include <stddef.h>  #include <stddef.h>
7  /* dlopen, dlsym, dlerror */  /* dlopen, dlsym, dlerror */
8  #include <dlfcn.h>  #include <dlfcn.h>
9    /* assert */
10    #include <assert.h>
11    
12  #define HASHTBLSIZE 65536  #define HASHTBLSIZE 65536
13    
# Line 13  typedef struct stack_item Line 15  typedef struct stack_item
15  {  {
16    enum {    enum {
17      value,                      /* Integer */      value,                      /* Integer */
18      string,      string,
19      ref,            /* Reference (to an element in the hash table) */      ref,                        /* Reference (to an element in the
20                                       hash table) */
21      func,                       /* Function pointer */      func,                       /* Function pointer */
22      symbol,      symbol,
23      list      list
24    } type;                       /* Tells what kind of stack element */    } type;                       /* Type of stack element */
25      
26    union {    union {
27      void* ptr;                  /* Pointer to the content */      void* ptr;                  /* Pointer to the content */
28      int val;                    /* ...or an integer */      int val;                    /* ...or an integer */
# Line 31  typedef struct stack_item Line 34  typedef struct stack_item
34    
35    
36  typedef stackitem* hashtbl[HASHTBLSIZE]; /* Hash table declaration */  typedef stackitem* hashtbl[HASHTBLSIZE]; /* Hash table declaration */
37  typedef void (*funcp)(stackitem**); /* Function pointer declaration */  typedef void (*funcp)(stackitem**); /* funcp is a pointer to a
38                                           void function (stackitem **) */
39    
40  /* Initiates a newly created hash table. */  /* Initialize a newly created hash table. */
41  void init_hashtbl(hashtbl out_hash)  void init_hashtbl(hashtbl out_hash)
42  {  {
43    long i;    long i;
# Line 48  stackitem** hash(hashtbl in_hashtbl, con Line 51  stackitem** hash(hashtbl in_hashtbl, con
51  {  {
52    long i= 0;    long i= 0;
53    unsigned long out_hash= 0;    unsigned long out_hash= 0;
54    char key= 0;    char key= '\0';
55    stackitem** position;    stackitem** position;
56        
57    while(1){                     /* Hash in_string */    while(1){                     /* Hash in_string */
# Line 61  stackitem** hash(hashtbl in_hashtbl, con Line 64  stackitem** hash(hashtbl in_hashtbl, con
64    out_hash= out_hash%HASHTBLSIZE;    out_hash= out_hash%HASHTBLSIZE;
65    position= &(in_hashtbl[out_hash]);    position= &(in_hashtbl[out_hash]);
66    
67    while(1){                     /* Return position if empty */    while(position != NULL){
68      if(*position==NULL)      if(*position==NULL)         /* If empty */
69        return position;        return position;
70            
71      if(strcmp(in_string, (*position)->id)==0) /* Return position if match */      if(strcmp(in_string, (*position)->id)==0) /* If match */
72        return position;        return position;
73    
74      position= &((*position)->next); /* Try next */      position= &((*position)->next); /* Try next */
75    }    }
76      return NULL;                  /* end of list reached without finding
77                                       an empty position */
78  }  }
79    
80  /* Generic push function. */  /* Generic push function. */
# Line 84  int push(stackitem** stack_head, stackit Line 89  int push(stackitem** stack_head, stackit
89  int push_val(stackitem** stack_head, int in_val)  int push_val(stackitem** stack_head, int in_val)
90  {  {
91    stackitem* new_item= malloc(sizeof(stackitem));    stackitem* new_item= malloc(sizeof(stackitem));
92      assert(new_item != NULL);
93    new_item->content.val= in_val;    new_item->content.val= in_val;
94    new_item->type= value;    new_item->type= value;
95    
# Line 114  int mk_hashentry(hashtbl in_hashtbl, sta Line 120  int mk_hashentry(hashtbl in_hashtbl, sta
120    return 1;    return 1;
121  }  }
122    
123  /* Define a function a new function in the hash table. */  /* Define a new function in the hash table. */
124  void def_func(hashtbl in_hashtbl, funcp in_func, const char* id)  void def_func(hashtbl in_hashtbl, funcp in_func, const char* id)
125  {  {
126    stackitem* temp= malloc(sizeof(stackitem));    stackitem* temp= malloc(sizeof(stackitem));
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