/[cvs]/stack/stack.c
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Diff of /stack/stack.c

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revision 1.79 by masse, Thu Feb 14 12:01:58 2002 UTC revision 1.80 by teddy, Thu Feb 14 12:20:09 2002 UTC
# Line 340  extern void type(environment *env){ Line 340  extern void type(environment *env){
340  }      }    
341    
342  /* Prints the top element of the stack. */  /* Prints the top element of the stack. */
343  void print_h(stackitem *stack_head)  void print_h(stackitem *stack_head, int noquote)
344  {  {
345    switch(stack_head->item->type) {    switch(stack_head->item->type) {
346    case integer:    case integer:
347      printf("%d", stack_head->item->content.val);      printf("%d", stack_head->item->content.val);
348      break;      break;
349    case string:    case string:
350      printf("%s", (char*)stack_head->item->content.ptr);      if(noquote)
351          printf("%s", (char*)stack_head->item->content.ptr);
352        else
353          printf("\"%s\"", (char*)stack_head->item->content.ptr);
354      break;      break;
355    case symb:    case symb:
356      printf("%s", ((symbol *)(stack_head->item->content.ptr))->id);      printf("%s", ((symbol *)(stack_head->item->content.ptr))->id);
# Line 360  void print_h(stackitem *stack_head) Line 363  void print_h(stackitem *stack_head)
363      stack_head=(stackitem *)(stack_head->item->content.ptr);      stack_head=(stackitem *)(stack_head->item->content.ptr);
364      printf("[ ");      printf("[ ");
365      while(stack_head != NULL) {      while(stack_head != NULL) {
366        print_h(stack_head);        print_h(stack_head, noquote);
367        printf(" ");        printf(" ");
368        stack_head=stack_head->next;        stack_head=stack_head->next;
369      }      }
# Line 375  extern void print_(environment *env) { Line 378  extern void print_(environment *env) {
378      env->err=1;      env->err=1;
379      return;      return;
380    }    }
381    print_h(env->head);    print_h(env->head, 0);
382      nl();
383  }  }
384    
385  /* Prints the top element of the stack and then discards it. */  /* Prints the top element of the stack and then discards it. */
# Line 386  extern void print(environment *env) Line 390  extern void print(environment *env)
390    toss(env);    toss(env);
391  }  }
392    
393    extern void princ_(environment *env) {
394      if(env->head==NULL) {
395        printerr("Too Few Arguments");
396        env->err=1;
397        return;
398      }
399      print_h(env->head, 1);
400    }
401    
402    /* Prints the top element of the stack and then discards it. */
403    extern void princ(environment *env)
404    {
405      princ_(env);
406      if(env->err) return;
407      toss(env);
408    }
409    
410  /* Only to be called by function printstack. */  /* Only to be called by function printstack. */
411  void print_st(stackitem *stack_head, long counter)  void print_st(stackitem *stack_head, long counter)
412  {  {
413    if(stack_head->next != NULL)    if(stack_head->next != NULL)
414      print_st(stack_head->next, counter+1);      print_st(stack_head->next, counter+1);
415    printf("%ld: ", counter);    printf("%ld: ", counter);
416    print_h(stack_head);    print_h(stack_head, 0);
417    nl();    nl();
418  }  }
419    
# Line 400  void print_st(stackitem *stack_head, lon Line 421  void print_st(stackitem *stack_head, lon
421  extern void printstack(environment *env)  extern void printstack(environment *env)
422  {  {
423    if(env->head == NULL) {    if(env->head == NULL) {
424        printf("Stack Empty\n");
425      return;      return;
426    }    }
427    print_st(env->head, 1);    print_st(env->head, 1);
   nl();  
428  }  }
429    
430  /* Swap the two top elements on the stack. */  /* Swap the two top elements on the stack. */
# Line 476  extern void eval(environment *env) Line 497  extern void eval(environment *env)
497    value* temp_val;    value* temp_val;
498    stackitem* iterator;    stackitem* iterator;
499    
500     eval_start:
501    
502    if(env->head==NULL) {    if(env->head==NULL) {
503      printerr("Too Few Arguments");      printerr("Too Few Arguments");
504      env->err=1;      env->err=1;
505      return;      return;
506    }    }
507    
  eval_start:  
   
508    switch(env->head->item->type) {    switch(env->head->item->type) {
509      /* if it's a symbol */      /* if it's a symbol */
510    case symb:    case symb:
# Line 731  extern void quit(environment *env) Line 752  extern void quit(environment *env)
752    for(i= 0; i<HASHTBLSIZE; i++) {    for(i= 0; i<HASHTBLSIZE; i++) {
753      while(env->symbols[i]!= NULL) {      while(env->symbols[i]!= NULL) {
754        forget_sym(&(env->symbols[i]));        forget_sym(&(env->symbols[i]));
       env->symbols[i]= NULL;  
755      }      }
756        env->symbols[i]= NULL;
757    }    }
758    exit(EXIT_SUCCESS);    exit(EXIT_SUCCESS);
759  }  }
# Line 811  int main() Line 832  int main()
832    init_env(&myenv);    init_env(&myenv);
833    
834    while(1) {    while(1) {
835      if(myenv.in_string==NULL)      if(myenv.in_string==NULL) {
836          nl();
837        printstack(&myenv);        printstack(&myenv);
838          printf("> ");
839        }
840      read(&myenv);      read(&myenv);
841      if(myenv.err) {      if(myenv.err) {
842        printf("(error %d) ", myenv.err);        printf("(error %d) ", myenv.err);
# Line 1210  extern void read(environment *env) { Line 1234  extern void read(environment *env) {
1234    size_t inlength;    size_t inlength;
1235    
1236    if(env->in_string==NULL) {    if(env->in_string==NULL) {
1237        if(depth > 0) {
1238          printf("]> ");
1239        }
1240      readline(env); if(env->err) return;      readline(env); if(env->err) return;
1241            
1242      env->in_string= malloc(strlen(env->head->item->content.ptr)+1);      env->in_string= malloc(strlen(env->head->item->content.ptr)+1);
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