/[cvs]/stack/stack.c
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revision 1.45 by teddy, Thu Feb 7 01:06:44 2002 UTC revision 1.47 by masse, Thu Feb 7 04:11:10 2002 UTC
# Line 8  Line 8 
8  #include <dlfcn.h>  #include <dlfcn.h>
9  /* assert */  /* assert */
10  #include <assert.h>  #include <assert.h>
11    /* strcat */
12    #include <string.h>
13    
14  #define HASHTBLSIZE 65536  #define HASHTBLSIZE 65536
15    
# Line 57  typedef struct { Line 59  typedef struct {
59    stackitem *head;              /* Head of the stack */    stackitem *head;              /* Head of the stack */
60    hashtbl symbols;              /* Hash table of all variable bindings */    hashtbl symbols;              /* Hash table of all variable bindings */
61    int err;                      /* Error flag */    int err;                      /* Error flag */
62      int non_eval_flag;
63  } environment;  } environment;
64    
65  /* A type for pointers to external functions */  /* A type for pointers to external functions */
# Line 66  typedef void (*funcp)(environment *); /* Line 69  typedef void (*funcp)(environment *); /*
69  /* Initialize a newly created environment */  /* Initialize a newly created environment */
70  void init_env(environment *env)  void init_env(environment *env)
71  {  {
72    long i;    int i;
73    
74    env->err=0;    env->err= 0;
75      env->non_eval_flag= 0;
76    for(i= 0; i<HASHTBLSIZE; i++)    for(i= 0; i<HASHTBLSIZE; i++)
77      env->symbols[i]= NULL;      env->symbols[i]= NULL;
78  }  }
# Line 76  void init_env(environment *env) Line 80  void init_env(environment *env)
80  /* Returns a pointer to a pointer to an element in the hash table. */  /* Returns a pointer to a pointer to an element in the hash table. */
81  symbol **hash(hashtbl in_hashtbl, const char *in_string)  symbol **hash(hashtbl in_hashtbl, const char *in_string)
82  {  {
83    long i= 0;    int i= 0;
84    unsigned long out_hash= 0;    unsigned int out_hash= 0;
85    char key= '\0';    char key= '\0';
86    symbol **position;    symbol **position;
87        
# Line 350  void print_st(stackitem *stack_head, lon Line 354  void print_st(stackitem *stack_head, lon
354    nl();    nl();
355  }  }
356    
   
   
357  /* Prints the stack. */  /* Prints the stack. */
358  extern void printstack(environment *env)  extern void printstack(environment *env)
359  {  {
# Line 367  extern void swap(environment *env) Line 369  extern void swap(environment *env)
369  {  {
370    stackitem *temp= env->head;    stackitem *temp= env->head;
371        
372    if((env->head)==NULL) {    if(env->head==NULL || env->head->next==NULL) {
     printerr("Too Few Arguments");  
     env->err=1;  
     return;  
   }  
   
   if(env->head->next==NULL) {  
373      printerr("Too Few Arguments");      printerr("Too Few Arguments");
374      env->err=1;      env->err=1;
375      return;      return;
# Line 384  extern void swap(environment *env) Line 380  extern void swap(environment *env)
380    env->head->next= temp;    env->head->next= temp;
381  }  }
382    
 stackitem* copy(stackitem* in_item)  
 {  
   stackitem *out_item= malloc(sizeof(stackitem));  
   
   memcpy(out_item, in_item, sizeof(stackitem));  
   out_item->next= NULL;  
   
   return out_item;  
 }  
   
383  /* Recall a value from a symbol, if bound */  /* Recall a value from a symbol, if bound */
384  extern void rcl(environment *env)  extern void rcl(environment *env)
385  {  {
# Line 422  extern void rcl(environment *env) Line 408  extern void rcl(environment *env)
408    push_val(&(env->head), val); /* Return its bound value */    push_val(&(env->head), val); /* Return its bound value */
409  }  }
410    
411    void stack_read(environment*, char*);
412    
413  /* If the top element is a symbol, determine if it's bound to a  /* If the top element is a symbol, determine if it's bound to a
414     function value, and if it is, toss the symbol and execute the     function value, and if it is, toss the symbol and execute the
415     function. */     function. */
# Line 430  extern void eval(environment *env) Line 418  extern void eval(environment *env)
418    funcp in_func;    funcp in_func;
419    value* temp_val;    value* temp_val;
420    stackitem* iterator;    stackitem* iterator;
421      char* temp_string;
422    
423    if(env->head==NULL) {    if(env->head==NULL) {
424      printerr("Too Few Arguments");      printerr("Too Few Arguments");
# Line 437  extern void eval(environment *env) Line 426  extern void eval(environment *env)
426      return;      return;
427    }    }
428    
429    /* if it's a symbol */    switch(env->head->item->type) {
430    if(env->head->item->type==symb) {      /* if it's a symbol */
431      case symb:
432      rcl(env);                   /* get its contents */      rcl(env);                   /* get its contents */
433      if(env->err) return;      if(env->err) return;
434      if(env->head->item->type!=symb){ /* don't recurse symbols */      if(env->head->item->type!=symb){ /* don't recurse symbols */
435        eval(env);                        /* evaluate the value */        eval(env);                        /* evaluate the value */
436        return;        return;
437      }      }
438    }      break;
439    
440    /* If it's a lone function value, run it */      /* If it's a lone function value, run it */
441    if(env->head->item->type==func) {    case func:
442      in_func= (funcp)(env->head->item->content.ptr);      in_func= (funcp)(env->head->item->content.ptr);
443      toss(env);      toss(env);
444      if(env->err) return;      if(env->err) return;
445      (*in_func)(env);      (*in_func)(env);
446      return;      break;
   }  
447    
448    /* If it's a list */      /* If it's a list */
449    if(env->head->item->type==list) {    case list:
450      temp_val= env->head->item;      temp_val= env->head->item;
451      env->head->item->refcount++;      env->head->item->refcount++;
452      toss(env);      toss(env);
# Line 471  extern void eval(environment *env) Line 459  extern void eval(environment *env)
459          toss(env);          toss(env);
460          if(env->err) return;          if(env->err) return;
461          eval(env);          eval(env);
462            if(env->err) return;
463        }        }
464        iterator= iterator->next;        iterator= iterator->next;
465      }      }
466      free_val(temp_val);      free_val(temp_val);
467        break;
468    
469        /* If it's a string */
470      case string:
471        temp_val= env->head->item;
472        env->head->item->refcount++;
473        toss(env);
474        if(env->err) return;
475        temp_string= malloc(strlen((char*)temp_val->content.ptr)+5);
476        strcat(temp_string, "[ ");
477        strcat(temp_string, (char*)temp_val->content.ptr);
478        strcat(temp_string, " ]");
479        stack_read(env, temp_string);
480        eval(env);
481        if(env->err) return;
482        free_val(temp_val);
483        free(temp_string);
484        break;
485    
486      default:
487    }    }
488  }  }
489    
# Line 555  void stack_read(environment *env, char * Line 564  void stack_read(environment *env, char *
564    int itemp;    int itemp;
565    size_t inlength= strlen(in_line)+1;    size_t inlength= strlen(in_line)+1;
566    int convert= 0;    int convert= 0;
   static int non_eval_flag= 0;  
567    
568    temp= malloc(inlength);    temp= malloc(inlength);
569    rest= malloc(inlength);    rest= malloc(inlength);
# Line 591  void stack_read(environment *env, char * Line 599  void stack_read(environment *env, char *
599      /* If single char */      /* If single char */
600      if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest))) {      if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest))) {
601        if(*temp==';') {        if(*temp==';') {
602          if(!non_eval_flag) {          if(!env->non_eval_flag) {
603            eval(env);            /* Evaluate top element */            eval(env);            /* Evaluate top element */
604            break;            break;
605          }          }
# Line 603  void stack_read(environment *env, char * Line 611  void stack_read(environment *env, char *
611        if(*temp==']') {        if(*temp==']') {
612          push_sym(env, "[");          push_sym(env, "[");
613          pack(env);          pack(env);
614          if(non_eval_flag!=0)          if(env->non_eval_flag)
615            non_eval_flag--;            env->non_eval_flag--;
616          break;          break;
617        }        }
618    
619        if(*temp=='[') {        if(*temp=='[') {
620          push_sym(env, "[");          push_sym(env, "[");
621          non_eval_flag++;          env->non_eval_flag++;
622          break;          break;
623        }        }
624      }      }
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