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revision 1.130 by masse, Mon Aug 4 14:32:27 2003 UTC revision 1.135 by masse, Wed Aug 13 11:58:00 2003 UTC
# Line 23  Line 23 
23    
24  #include "stack.h"  #include "stack.h"
25    
26    const char* start_message= "Stack version $Revision$\n\
27    Copyright (C) 2002  Mats Alritzson and Teddy Hogeborn\n\
28    Stack comes with ABSOLUTELY NO WARRANTY; for details type 'warranty;'.\n\
29    This is free software, and you are welcome to redistribute it\n\
30    under certain conditions; type 'copying;' for details.\n";
31    
32    
33  /* Initialize a newly created environment */  /* Initialize a newly created environment */
34  void init_env(environment *env)  void init_env(environment *env)
35  {  {
# Line 42  void init_env(environment *env) Line 49  void init_env(environment *env)
49    env->interactive= 1;    env->interactive= 1;
50  }  }
51    
52  void printerr(const char* in_string)  
53    void printerr(environment *env)
54  {  {
55    fprintf(stderr, "Err: %s\n", in_string);    char *in_string;
56    
57      switch(env->err) {
58      case 0:
59        return;
60      case 1:
61        in_string= "Too Few Arguments";
62        break;
63      case 2:
64        in_string= "Bad Argument Type";
65        break;
66      case 3:
67        in_string= "Unbound Variable";
68        break;
69      default:
70        in_string= "Unknown error";
71        break;
72      }
73    
74      fprintf(stderr, "\"%s\":\nErr: %s\n", env->errsymb, in_string);
75  }  }
76    
77    
78  /* 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. */
79  symbol **hash(hashtbl in_hashtbl, const char *in_string)  symbol **hash(hashtbl in_hashtbl, const char *in_string)
80  {  {
# Line 76  symbol **hash(hashtbl in_hashtbl, const Line 104  symbol **hash(hashtbl in_hashtbl, const
104    }    }
105  }  }
106    
107    
108  /* Create new value */  /* Create new value */
109  value* new_val(environment *env)  value* new_val(environment *env)
110  {  {
# Line 133  extern void gc_init(environment *env) Line 162  extern void gc_init(environment *env)
162    if(env->interactive)    if(env->interactive)
163      printf(".");      printf(".");
164    
   
165    /* Mark values in hashtable */    /* Mark values in hashtable */
166    for(i= 0; i<HASHTBLSIZE; i++)    for(i= 0; i<HASHTBLSIZE; i++)
167      for(tsymb= env->symbols[i]; tsymb!=NULL; tsymb= tsymb->next)      for(tsymb= env->symbols[i]; tsymb!=NULL; tsymb= tsymb->next)
168        if (tsymb->val != NULL)        if (tsymb->val != NULL)
169          gc_mark(tsymb->val);          gc_mark(tsymb->val);
170    
   
171    if(env->interactive)    if(env->interactive)
172      printf(".");      printf(".");
173    
174    env->gc_count= 0;    env->gc_count= 0;
175    
176    while(env->gc_ref!=NULL) {    /* Sweep unused values */    while(env->gc_ref!=NULL) {    /* Sweep unused values */
   
177      if(!(env->gc_ref->item->gc.no_gc)){ /* neither mark nor protect */      if(!(env->gc_ref->item->gc.no_gc)){ /* neither mark nor protect */
178    
179        /* Remove content */        /* Remove content */
# Line 160  extern void gc_init(environment *env) Line 186  extern void gc_init(environment *env)
186          break;          break;
187        case port:        case port:
188        case empty:        case empty:
189          case unknown:
190        case integer:        case integer:
191        case tfloat:        case tfloat:
192        case func:        case func:
# Line 174  extern void gc_init(environment *env) Line 201  extern void gc_init(environment *env)
201        env->gc_ref= titem;        env->gc_ref= titem;
202        continue;        continue;
203      }      }
204    
205  #ifdef DEBUG  #ifdef DEBUG
206      printf("Kept value (%p)", env->gc_ref->item);      printf("Kept value (%p)", env->gc_ref->item);
207      if(env->gc_ref->item->gc.flag.mark)      if(env->gc_ref->item->gc.flag.mark)
# Line 222  extern void gc_init(environment *env) Line 250  extern void gc_init(environment *env)
250    
251  }  }
252    
253    
254  inline void gc_maybe(environment *env)  inline void gc_maybe(environment *env)
255  {  {
256    if(env->gc_count < env->gc_limit)    if(env->gc_count < env->gc_limit)
# Line 230  inline void gc_maybe(environment *env) Line 259  inline void gc_maybe(environment *env)
259      return gc_init(env);      return gc_init(env);
260  }  }
261    
262    
263  /* Protect values from GC */  /* Protect values from GC */
264  void protect(value *val)  void protect(value *val)
265  {  {
# Line 244  void protect(value *val) Line 274  void protect(value *val)
274    }    }
275  }  }
276    
277    
278  /* Unprotect values from GC */  /* Unprotect values from GC */
279  void unprotect(value *val)  void unprotect(value *val)
280  {  {
# Line 258  void unprotect(value *val) Line 289  void unprotect(value *val)
289    }    }
290  }  }
291    
292    
293  /* Push a value onto the stack */  /* Push a value onto the stack */
294  void push_val(environment *env, value *val)  void push_val(environment *env, value *val)
295  {  {
# Line 272  void push_val(environment *env, value *v Line 304  void push_val(environment *env, value *v
304    env->head= new_value;    env->head= new_value;
305  }  }
306    
307    
308  /* Push an integer onto the stack */  /* Push an integer onto the stack */
309  void push_int(environment *env, int in_val)  void push_int(environment *env, int in_val)
310  {  {
# Line 283  void push_int(environment *env, int in_v Line 316  void push_int(environment *env, int in_v
316    push_val(env, new_value);    push_val(env, new_value);
317  }  }
318    
319    
320  /* Push a floating point number onto the stack */  /* Push a floating point number onto the stack */
321  void push_float(environment *env, float in_val)  void push_float(environment *env, float in_val)
322  {  {
# Line 294  void push_float(environment *env, float Line 328  void push_float(environment *env, float
328    push_val(env, new_value);    push_val(env, new_value);
329  }  }
330    
331    
332  /* Copy a string onto the stack. */  /* Copy a string onto the stack. */
333  void push_cstring(environment *env, const char *in_string)  void push_cstring(environment *env, const char *in_string)
334  {  {
# Line 309  void push_cstring(environment *env, cons Line 344  void push_cstring(environment *env, cons
344    push_val(env, new_value);    push_val(env, new_value);
345  }  }
346    
347    
348  /* Mangle a symbol name to a valid C identifier name */  /* Mangle a symbol name to a valid C identifier name */
349  char *mangle_str(const char *old_string)  char *mangle_str(const char *old_string)
350  {  {
# Line 319  char *mangle_str(const char *old_string) Line 355  char *mangle_str(const char *old_string)
355    assert(new_string != NULL);    assert(new_string != NULL);
356    strcpy(new_string, "sx_");    /* Stack eXternal */    strcpy(new_string, "sx_");    /* Stack eXternal */
357    current= new_string+3;    current= new_string+3;
358    
359    while(old_string[0] != '\0'){    while(old_string[0] != '\0'){
360      current[0]= validchars[(unsigned char)(old_string[0])/16];      current[0]= validchars[(unsigned char)(old_string[0])/16];
361      current[1]= validchars[(unsigned char)(old_string[0])%16];      current[1]= validchars[(unsigned char)(old_string[0])%16];
# Line 330  char *mangle_str(const char *old_string) Line 367  char *mangle_str(const char *old_string)
367    return new_string;            /* The caller must free() it */    return new_string;            /* The caller must free() it */
368  }  }
369    
 extern void mangle(environment *env)  
 {  
   char *new_string;  
   
   if(env->head->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   if(CAR(env->head)->type!=string) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
   
   new_string= mangle_str(CAR(env->head)->content.string);  
   
   toss(env);  
   if(env->err) return;  
   
   push_cstring(env, new_string);  
 }  
370    
371  /* Push a symbol onto the stack. */  /* Push a symbol onto the stack. */
372  void push_sym(environment *env, const char *in_string)  void push_sym(environment *env, const char *in_string)
# Line 370  void push_sym(environment *env, const ch Line 384  void push_sym(environment *env, const ch
384    char *mangled;                /* Mangled function name */    char *mangled;                /* Mangled function name */
385    
386    new_value= new_val(env);    new_value= new_val(env);
   protect(new_value);  
387    new_fvalue= new_val(env);    new_fvalue= new_val(env);
   protect(new_fvalue);  
388    
389    /* The new value is a symbol */    /* The new value is a symbol */
390    new_value->type= symb;    new_value->type= symb;
# Line 420  void push_sym(environment *env, const ch Line 432  void push_sym(environment *env, const ch
432    }    }
433    
434    push_val(env, new_value);    push_val(env, new_value);
   unprotect(new_value); unprotect(new_fvalue);  
435  }  }
436    
437    
438  /* Print a value */  /* Print a value */
439  void print_val(environment *env, value *val, int noquote, stackitem *stack, FILE *stream)  void print_val(environment *env, value *val, int noquote, stackitem *stack,
440                   FILE *stream)
441  {  {
442    stackitem *titem, *tstack;    stackitem *titem, *tstack;
443    int depth;    int depth;
# Line 437  void print_val(environment *env, value * Line 450  void print_val(environment *env, value *
450        return;        return;
451      }      }
452      break;      break;
453      case unknown:
454        if(fprintf(stream, "UNKNOWN") < 0){
455          perror("print_val");
456          env->err= 5;
457          return;
458        }
459        break;
460    case integer:    case integer:
461      if(fprintf(stream, "%d", val->content.i) < 0){      if(fprintf(stream, "%d", val->content.i) < 0){
462        perror("print_val");        perror("print_val");
# Line 494  void print_val(environment *env, value * Line 514  void print_val(environment *env, value *
514        return;        return;
515      }      }
516      tstack= stack;      tstack= stack;
517    
518      do {      do {
519        titem=malloc(sizeof(stackitem));        titem=malloc(sizeof(stackitem));
520        assert(titem != NULL);        assert(titem != NULL);
# Line 504  void print_val(environment *env, value * Line 525  void print_val(environment *env, value *
525           printing this value */           printing this value */
526        titem=tstack;        titem=tstack;
527        depth=0;        depth=0;
528    
529        while(titem != NULL && titem->item != CAR(val)){        while(titem != NULL && titem->item != CAR(val)){
530          titem=titem->next;          titem=titem->next;
531          depth++;          depth++;
532        }        }
533    
534        if(titem != NULL){        /* If we found it on the stack, */        if(titem != NULL){        /* If we found it on the stack, */
535          if(fprintf(stream, "#%d#", depth) < 0){ /* print a depth reference */          if(fprintf(stream, "#%d#", depth) < 0){ /* print a depth reference */
536            perror("print_val");            perror("print_val");
# Line 518  void print_val(environment *env, value * Line 541  void print_val(environment *env, value *
541        } else {        } else {
542          print_val(env, CAR(val), noquote, tstack, stream);          print_val(env, CAR(val), noquote, tstack, stream);
543        }        }
544    
545        val= CDR(val);        val= CDR(val);
546        switch(val->type){        switch(val->type){
547        case empty:        case empty:
# Line 527  void print_val(environment *env, value * Line 551  void print_val(environment *env, value *
551             printing this value */             printing this value */
552          titem=tstack;          titem=tstack;
553          depth=0;          depth=0;
554    
555          while(titem != NULL && titem->item != val){          while(titem != NULL && titem->item != val){
556            titem=titem->next;            titem=titem->next;
557            depth++;            depth++;
# Line 574  void print_val(environment *env, value * Line 599  void print_val(environment *env, value *
599    }    }
600  }  }
601    
602    
603  /* Swap the two top elements on the stack. */  /* Swap the two top elements on the stack. */
604  extern void swap(environment *env)  extern void swap(environment *env)
605  {  {
606    value *temp= env->head;    value *temp= env->head;
     
   if(env->head->type == empty || CDR(env->head)->type == empty) {  
     printerr("Too Few Arguments");  
     env->err=1;  
     return;  
   }  
607    
608      if(check_args(env, unknown, unknown, empty))
609        return printerr(env);
610      
611    env->head= CDR(env->head);    env->head= CDR(env->head);
612    CDR(temp)= CDR(env->head);    CDR(temp)= CDR(env->head);
613    CDR(env->head)= temp;    CDR(env->head)= temp;
614  }  }
615    
616    
617  /* Recall a value from a symbol, if bound */  /* Recall a value from a symbol, if bound */
618  extern void rcl(environment *env)  extern void rcl(environment *env)
619  {  {
620    value *val;    value *val;
621    
622    if(env->head->type==empty) {    if(check_args(env, symb, empty))
623      printerr("Too Few Arguments");      return printerr(env);
     env->err= 1;  
     return;  
   }  
   
   if(CAR(env->head)->type!=symb) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
624    
625    val= CAR(env->head)->content.sym->val;    val= CAR(env->head)->content.sym->val;
626    if(val == NULL){    if(val == NULL){
     printerr("Unbound Variable");  
627      env->err= 3;      env->err= 3;
628      return;      return printerr(env);
629    }    }
630    
631    push_val(env, val);           /* Return the symbol's bound value */    push_val(env, val);           /* Return the symbol's bound value */
632    swap(env);    swap(env);
633    if(env->err) return;    if(env->err) return;
634    toss(env);                    /* toss the symbol */    env->head= CDR(env->head);
   if(env->err) return;  
635  }  }
636    
637    
# Line 634  extern void eval(environment *env) Line 648  extern void eval(environment *env)
648    
649    gc_maybe(env);    gc_maybe(env);
650    
651    if(env->head->type==empty) {    if(check_args(env, unknown, empty))
652      printerr("Too Few Arguments");      return printerr(env);
     env->err= 1;  
     return;  
   }  
653    
654    switch(CAR(env->head)->type) {    switch(CAR(env->head)->type) {
655      /* if it's a symbol */      /* if it's a symbol */
656    case symb:    case symb:
657        env->errsymb= CAR(env->head)->content.sym->id;
658      rcl(env);                   /* get its contents */      rcl(env);                   /* get its contents */
659      if(env->err) return;      if(env->err) return;
660      if(CAR(env->head)->type!=symb){ /* don't recurse symbols */      if(CAR(env->head)->type!=symb){ /* don't recurse symbols */
# Line 653  extern void eval(environment *env) Line 665  extern void eval(environment *env)
665      /* If it's a lone function value, run it */      /* If it's a lone function value, run it */
666    case func:    case func:
667      in_func= CAR(env->head)->content.func;      in_func= CAR(env->head)->content.func;
668      toss(env);      env->head= CDR(env->head);
669      if(env->err) return;      return in_func((void*)env);
     return in_func(env);  
670    
671      /* If it's a list */      /* If it's a list */
672    case tcons:    case tcons:
673      temp_val= CAR(env->head);      temp_val= CAR(env->head);
674      protect(temp_val);      protect(temp_val);
675    
676      toss(env); if(env->err) return;      env->head= CDR(env->head);
677      iterator= temp_val;      iterator= temp_val;
678            
679      while(iterator->type != empty) {      while(iterator->type != empty) {
680        push_val(env, CAR(iterator));        push_val(env, CAR(iterator));
681                
682        if(CAR(env->head)->type==symb       if(CAR(env->head)->type==symb
683           && CAR(env->head)->content.sym->id[0]==';') {           && CAR(env->head)->content.sym->id[0]==';') {
684          toss(env);          env->head= CDR(env->head);
         if(env->err) return;  
685                    
686          if(CDR(iterator)->type == empty){          if(CDR(iterator)->type == empty){
687            goto eval_start;            goto eval_start;
# Line 682  extern void eval(environment *env) Line 692  extern void eval(environment *env)
692        if (CDR(iterator)->type == empty || CDR(iterator)->type == tcons)        if (CDR(iterator)->type == empty || CDR(iterator)->type == tcons)
693          iterator= CDR(iterator);          iterator= CDR(iterator);
694        else {        else {
695          printerr("Bad Argument Type"); /* Improper list */          env->err= 2; /* Improper list */
696          env->err= 2;          return printerr(env);
         return;  
697        }        }
698      }      }
699      unprotect(temp_val);      unprotect(temp_val);
700      return;      return;
701    
702    case empty:    case empty:
703      toss(env);      env->head= CDR(env->head);
704    case integer:    case integer:
705    case tfloat:    case tfloat:
706    case string:    case string:
707    case port:    case port:
708      case unknown:
709      return;      return;
710    }    }
711  }  }
712    
 /* List all defined words */  
 extern void words(environment *env)  
 {  
   symbol *temp;  
   int i;  
     
   for(i= 0; i<HASHTBLSIZE; i++) {  
     temp= env->symbols[i];  
     while(temp!=NULL) {  
 #ifdef DEBUG  
       if (temp->val != NULL && temp->val->gc.flag.protect)  
         printf("(protected) ");  
 #endif /* DEBUG */  
       printf("%s ", temp->id);  
       temp= temp->next;  
     }  
   }  
 }  
   
 /* Quit stack. */  
 extern void quit(environment *env)  
 {  
   int i;  
   
   while(env->head->type != empty)  
     toss(env);  
   
   if (env->err) return;  
   for(i= 0; i<HASHTBLSIZE; i++) {  
     while(env->symbols[i]!= NULL) {  
       forget_sym(&(env->symbols[i]));  
     }  
     env->symbols[i]= NULL;  
   }  
   
   env->gc_limit= 0;  
   gc_maybe(env);  
   
   words(env);  
   
   if(env->free_string!=NULL)  
     free(env->free_string);  
     
 #ifdef __linux__  
   muntrace();  
 #endif  
   
   exit(EXIT_SUCCESS);  
 }  
713    
714  /* Internal forget function */  /* Internal forget function */
715  void forget_sym(symbol **hash_entry)  void forget_sym(symbol **hash_entry)
# Line 762  void forget_sym(symbol **hash_entry) Line 723  void forget_sym(symbol **hash_entry)
723    free(temp);    free(temp);
724  }  }
725    
 /* Only to be called by itself function printstack. */  
 void print_st(environment *env, value *stack_head, long counter)  
 {  
   if(CDR(stack_head)->type != empty)  
     print_st(env, CDR(stack_head), counter+1);  
   printf("%ld: ", counter);  
   print_val(env, CAR(stack_head), 0, NULL, stdout);  
   printf("\n");  
 }  
   
 /* Prints the stack. */  
 extern void printstack(environment *env)  
 {  
   if(env->head->type == empty) {  
     printf("Stack Empty\n");  
     return;  
   }  
   
   print_st(env, env->head, 1);  
 }  
726    
727  int main(int argc, char **argv)  int main(int argc, char **argv)
728  {  {
729    environment myenv;    environment myenv;
   
730    int c;                        /* getopt option character */    int c;                        /* getopt option character */
731    
732  #ifdef __linux__  #ifdef __linux__
# Line 821  int main(int argc, char **argv) Line 761  int main(int argc, char **argv)
761      }      }
762    }    }
763    
764    if(myenv.interactive) {    if(myenv.interactive)
765      printf("Stack version $Revision$\n\      puts(start_message);
 Copyright (C) 2002  Mats Alritzson and Teddy Hogeborn\n\  
 Stack comes with ABSOLUTELY NO WARRANTY; for details type 'warranty;'.\n\  
 This is free software, and you are welcome to redistribute it\n\  
 under certain conditions; type 'copying;' for details.\n");  
   }  
766    
767    while(1) {    while(1) {
768      if(myenv.in_string==NULL) {      if(myenv.in_string==NULL) {
# Line 849  under certain conditions; type 'copying; Line 784  under certain conditions; type 'copying;
784      } else if(myenv.head->type!=empty      } else if(myenv.head->type!=empty
785                && CAR(myenv.head)->type==symb                && CAR(myenv.head)->type==symb
786                && CAR(myenv.head)->content.sym->id[0] == ';') {                && CAR(myenv.head)->content.sym->id[0] == ';') {
787        toss(&myenv); if(myenv.err) continue;        if(myenv.head->type != empty)
788            myenv.head= CDR(myenv.head);
789        eval(&myenv);        eval(&myenv);
790      } else {      } else {
791        gc_maybe(&myenv);        gc_maybe(&myenv);
# Line 859  under certain conditions; type 'copying; Line 795  under certain conditions; type 'copying;
795    return EXIT_FAILURE;    return EXIT_FAILURE;
796  }  }
797    
798    
799  /* Return copy of a value */  /* Return copy of a value */
800  value *copy_val(environment *env, value *old_value)  value *copy_val(environment *env, value *old_value)
801  {  {
# Line 876  value *copy_val(environment *env, value Line 813  value *copy_val(environment *env, value
813    case func:    case func:
814    case symb:    case symb:
815    case empty:    case empty:
816      case unknown:
817    case port:    case port:
818      new_value->content= old_value->content;      new_value->content= old_value->content;
819      break;      break;
# Line 896  value *copy_val(environment *env, value Line 834  value *copy_val(environment *env, value
834    return new_value;    return new_value;
835  }  }
836    
837    
838  /* read a line from a stream; used by readline */  /* read a line from a stream; used by readline */
839  void readlinestream(environment *env, FILE *stream)  void readlinestream(environment *env, FILE *stream)
840  {  {
# Line 912  void readlinestream(environment *env, FI Line 851  void readlinestream(environment *env, FI
851    }    }
852  }  }
853    
854    
855  /* Reverse (flip) a list */  /* Reverse (flip) a list */
856  extern void rev(environment *env)  extern void rev(environment *env)
857  {  {
858    value *old_head, *new_head, *item;    value *old_head, *new_head, *item;
859    
   if(env->head->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
860    if(CAR(env->head)->type==empty)    if(CAR(env->head)->type==empty)
861      return;                     /* Don't reverse an empty list */      return;                     /* Don't reverse an empty list */
862    
863    if(CAR(env->head)->type!=tcons) {    if(check_args(env, tcons, empty))
864      printerr("Bad Argument Type");      return printerr(env);
     env->err= 2;  
     return;  
   }  
865    
866    old_head= CAR(env->head);    old_head= CAR(env->head);
867    new_head= new_val(env);    new_head= new_val(env);
# Line 943  extern void rev(environment *env) Line 874  extern void rev(environment *env)
874    CAR(env->head)= new_head;    CAR(env->head)= new_head;
875  }  }
876    
877    
878  /* Make a list. */  /* Make a list. */
879  extern void pack(environment *env)  extern void pack(environment *env)
880  {  {
# Line 955  extern void pack(environment *env) Line 887  extern void pack(environment *env)
887       || (CAR(iterator)->type==symb       || (CAR(iterator)->type==symb
888       && CAR(iterator)->content.sym->id[0]=='[')) {       && CAR(iterator)->content.sym->id[0]=='[')) {
889      temp= ending;      temp= ending;
890      toss(env);      if(env->head->type != empty)
891          env->head= CDR(env->head);
892    } else {    } else {
893      /* Search for first delimiter */      /* Search for first delimiter */
894      while(CDR(iterator)->type != empty      while(CDR(iterator)->type != empty
# Line 969  extern void pack(environment *env) Line 902  extern void pack(environment *env)
902      CDR(iterator)= ending;      CDR(iterator)= ending;
903    
904      if(env->head->type != empty)      if(env->head->type != empty)
905        toss(env);        env->head= CDR(env->head);
906    }    }
907    
908    /* Push list */    /* Push list */
# Line 978  extern void pack(environment *env) Line 911  extern void pack(environment *env)
911    rev(env);    rev(env);
912  }  }
913    
914    
915  /* read from a stream; used by "read" and "readport" */  /* read from a stream; used by "read" and "readport" */
916  void readstream(environment *env, FILE *stream)  void readstream(environment *env, FILE *stream)
917  {  {
# Line 1013  void readstream(environment *env, FILE * Line 947  void readstream(environment *env, FILE *
947      assert(env->in_string != NULL);      assert(env->in_string != NULL);
948      env->free_string= env->in_string; /* Save the original pointer */      env->free_string= env->in_string; /* Save the original pointer */
949      strcpy(env->in_string, CAR(env->head)->content.string);      strcpy(env->in_string, CAR(env->head)->content.string);
950      toss(env); if(env->err) return;      env->head= CDR(env->head);
951    }    }
952        
953    inlength= strlen(env->in_string)+1;    inlength= strlen(env->in_string)+1;
# Line 1065  void readstream(environment *env, FILE * Line 999  void readstream(environment *env, FILE *
999      return readstream(env, env->inputstream);      return readstream(env, env->inputstream);
1000  }  }
1001    
1002  extern void copying(environment *env)  
1003    int check_args(environment *env, ...)
1004  {  {
1005    printf("                  GNU GENERAL PUBLIC LICENSE\n\    va_list ap;
1006                         Version 2, June 1991\n\    enum type_enum mytype;
1007  \n\  
1008   Copyright (C) 1989, 1991 Free Software Foundation, Inc.\n\    value *iter= env->head;
1009       59 Temple Place, Suite 330, Boston, MA  02111-1307  USA\n\    int errval= 0;
1010   Everyone is permitted to copy and distribute verbatim copies\n\  
1011   of this license document, but changing it is not allowed.\n\    va_start(ap, env);
1012  \n\    while(1) {
1013                              Preamble\n\      mytype= va_arg(ap, enum type_enum);
1014  \n\      //    fprintf(stderr, "%s\n", env->errsymb);
1015    The licenses for most software are designed to take away your\n\  
1016  freedom to share and change it.  By contrast, the GNU General Public\n\      if(mytype==empty)
1017  License is intended to guarantee your freedom to share and change free\n\        break;
1018  software--to make sure the software is free for all its users.  This\n\      
1019  General Public License applies to most of the Free Software\n\      if(iter->type==empty || iter==NULL) {
1020  Foundation's software and to any other program whose authors commit to\n\        errval= 1;
1021  using it.  (Some other Free Software Foundation software is covered by\n\        break;
1022  the GNU Library General Public License instead.)  You can apply it to\n\      }
1023  your programs, too.\n\  
1024  \n\      if(mytype==unknown) {
1025    When we speak of free software, we are referring to freedom, not\n\        iter=CDR(iter);
1026  price.  Our General Public Licenses are designed to make sure that you\n\        continue;
1027  have the freedom to distribute copies of free software (and charge for\n\      }
1028  this service if you wish), that you receive source code or can get it\n\  
1029  if you want it, that you can change the software or use pieces of it\n\      if(CAR(iter)->type!=mytype) {
1030  in new free programs; and that you know you can do these things.\n\        errval= 2;
1031  \n\        break;
1032    To protect your rights, we need to make restrictions that forbid\n\      }
1033  anyone to deny you these rights or to ask you to surrender the rights.\n\  
1034  These restrictions translate to certain responsibilities for you if you\n\      iter= CDR(iter);
 distribute copies of the software, or if you modify it.\n\  
 \n\  
   For example, if you distribute copies of such a program, whether\n\  
 gratis or for a fee, you must give the recipients all the rights that\n\  
 you have.  You must make sure that they, too, receive or can get the\n\  
 source code.  And you must show them these terms so they know their\n\  
 rights.\n\  
 \n\  
   We protect your rights with two steps: (1) copyright the software, and\n\  
 (2) offer you this license which gives you legal permission to copy,\n\  
 distribute and/or modify the software.\n\  
 \n\  
   Also, for each author's protection and ours, we want to make certain\n\  
 that everyone understands that there is no warranty for this free\n\  
 software.  If the software is modified by someone else and passed on, we\n\  
 want its recipients to know that what they have is not the original, so\n\  
 that any problems introduced by others will not reflect on the original\n\  
 authors' reputations.\n\  
 \n\  
   Finally, any free program is threatened constantly by software\n\  
 patents.  We wish to avoid the danger that redistributors of a free\n\  
 program will individually obtain patent licenses, in effect making the\n\  
 program proprietary.  To prevent this, we have made it clear that any\n\  
 patent must be licensed for everyone's free use or not licensed at all.\n\  
 \n\  
   The precise terms and conditions for copying, distribution and\n\  
 modification follow.\n\  
 \n\  
                     GNU GENERAL PUBLIC LICENSE\n\  
    TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION\n\  
 \n\  
   0. This License applies to any program or other work which contains\n\  
 a notice placed by the copyright holder saying it may be distributed\n\  
 under the terms of this General Public License.  The \"Program\", below,\n\  
 refers to any such program or work, and a \"work based on the Program\"\n\  
 means either the Program or any derivative work under copyright law:\n\  
 that is to say, a work containing the Program or a portion of it,\n\  
 either verbatim or with modifications and/or translated into another\n\  
 language.  (Hereinafter, translation is included without limitation in\n\  
 the term \"modification\".)  Each licensee is addressed as \"you\".\n\  
 \n\  
 Activities other than copying, distribution and modification are not\n\  
 covered by this License; they are outside its scope.  The act of\n\  
 running the Program is not restricted, and the output from the Program\n\  
 is covered only if its contents constitute a work based on the\n\  
 Program (independent of having been made by running the Program).\n\  
 Whether that is true depends on what the Program does.\n\  
 \n\  
   1. You may copy and distribute verbatim copies of the Program's\n\  
 source code as you receive it, in any medium, provided that you\n\  
 conspicuously and appropriately publish on each copy an appropriate\n\  
 copyright notice and disclaimer of warranty; keep intact all the\n\  
 notices that refer to this License and to the absence of any warranty;\n\  
 and give any other recipients of the Program a copy of this License\n\  
 along with the Program.\n\  
 \n\  
 You may charge a fee for the physical act of transferring a copy, and\n\  
 you may at your option offer warranty protection in exchange for a fee.\n\  
 \n\  
   2. You may modify your copy or copies of the Program or any portion\n\  
 of it, thus forming a work based on the Program, and copy and\n\  
 distribute such modifications or work under the terms of Section 1\n\  
 above, provided that you also meet all of these conditions:\n\  
 \n\  
     a) You must cause the modified files to carry prominent notices\n\  
     stating that you changed the files and the date of any change.\n\  
 \n\  
     b) You must cause any work that you distribute or publish, that in\n\  
     whole or in part contains or is derived from the Program or any\n\  
     part thereof, to be licensed as a whole at no charge to all third\n\  
     parties under the terms of this License.\n\  
 \n\  
     c) If the modified program normally reads commands interactively\n\  
     when run, you must cause it, when started running for such\n\  
     interactive use in the most ordinary way, to print or display an\n\  
     announcement including an appropriate copyright notice and a\n\  
     notice that there is no warranty (or else, saying that you provide\n\  
     a warranty) and that users may redistribute the program under\n\  
     these conditions, and telling the user how to view a copy of this\n\  
     License.  (Exception: if the Program itself is interactive but\n\  
     does not normally print such an announcement, your work based on\n\  
     the Program is not required to print an announcement.)\n\  
 \n\  
 These requirements apply to the modified work as a whole.  If\n\  
 identifiable sections of that work are not derived from the Program,\n\  
 and can be reasonably considered independent and separate works in\n\  
 themselves, then this License, and its terms, do not apply to those\n\  
 sections when you distribute them as separate works.  But when you\n\  
 distribute the same sections as part of a whole which is a work based\n\  
 on the Program, the distribution of the whole must be on the terms of\n\  
 this License, whose permissions for other licensees extend to the\n\  
 entire whole, and thus to each and every part regardless of who wrote it.\n\  
 \n\  
 Thus, it is not the intent of this section to claim rights or contest\n\  
 your rights to work written entirely by you; rather, the intent is to\n\  
 exercise the right to control the distribution of derivative or\n\  
 collective works based on the Program.\n\  
 \n\  
 In addition, mere aggregation of another work not based on the Program\n\  
 with the Program (or with a work based on the Program) on a volume of\n\  
 a storage or distribution medium does not bring the other work under\n\  
 the scope of this License.\n\  
 \n\  
   3. You may copy and distribute the Program (or a work based on it,\n\  
 under Section 2) in object code or executable form under the terms of\n\  
 Sections 1 and 2 above provided that you also do one of the following:\n\  
 \n\  
     a) Accompany it with the complete corresponding machine-readable\n\  
     source code, which must be distributed under the terms of Sections\n\  
     1 and 2 above on a medium customarily used for software interchange; or,\n\  
 \n\  
     b) Accompany it with a written offer, valid for at least three\n\  
     years, to give any third party, for a charge no more than your\n\  
     cost of physically performing source distribution, a complete\n\  
     machine-readable copy of the corresponding source code, to be\n\  
     distributed under the terms of Sections 1 and 2 above on a medium\n\  
     customarily used for software interchange; or,\n\  
 \n\  
     c) Accompany it with the information you received as to the offer\n\  
     to distribute corresponding source code.  (This alternative is\n\  
     allowed only for noncommercial distribution and only if you\n\  
     received the program in object code or executable form with such\n\  
     an offer, in accord with Subsection b above.)\n\  
 \n\  
 The source code for a work means the preferred form of the work for\n\  
 making modifications to it.  For an executable work, complete source\n\  
 code means all the source code for all modules it contains, plus any\n\  
 associated interface definition files, plus the scripts used to\n\  
 control compilation and installation of the executable.  However, as a\n\  
 special exception, the source code distributed need not include\n\  
 anything that is normally distributed (in either source or binary\n\  
 form) with the major components (compiler, kernel, and so on) of the\n\  
 operating system on which the executable runs, unless that component\n\  
 itself accompanies the executable.\n\  
 \n\  
 If distribution of executable or object code is made by offering\n\  
 access to copy from a designated place, then offering equivalent\n\  
 access to copy the source code from the same place counts as\n\  
 distribution of the source code, even though third parties are not\n\  
 compelled to copy the source along with the object code.\n\  
 \n\  
   4. You may not copy, modify, sublicense, or distribute the Program\n\  
 except as expressly provided under this License.  Any attempt\n\  
 otherwise to copy, modify, sublicense or distribute the Program is\n\  
 void, and will automatically terminate your rights under this License.\n\  
 However, parties who have received copies, or rights, from you under\n\  
 this License will not have their licenses terminated so long as such\n\  
 parties remain in full compliance.\n\  
 \n\  
   5. You are not required to accept this License, since you have not\n\  
 signed it.  However, nothing else grants you permission to modify or\n\  
 distribute the Program or its derivative works.  These actions are\n\  
 prohibited by law if you do not accept this License.  Therefore, by\n\  
 modifying or distributing the Program (or any work based on the\n\  
 Program), you indicate your acceptance of this License to do so, and\n\  
 all its terms and conditions for copying, distributing or modifying\n\  
 the Program or works based on it.\n\  
 \n\  
   6. Each time you redistribute the Program (or any work based on the\n\  
 Program), the recipient automatically receives a license from the\n\  
 original licensor to copy, distribute or modify the Program subject to\n\  
 these terms and conditions.  You may not impose any further\n\  
 restrictions on the recipients' exercise of the rights granted herein.\n\  
 You are not responsible for enforcing compliance by third parties to\n\  
 this License.\n\  
 \n\  
   7. If, as a consequence of a court judgment or allegation of patent\n\  
 infringement or for any other reason (not limited to patent issues),\n\  
 conditions are imposed on you (whether by court order, agreement or\n\  
 otherwise) that contradict the conditions of this License, they do not\n\  
 excuse you from the conditions of this License.  If you cannot\n\  
 distribute so as to satisfy simultaneously your obligations under this\n\  
 License and any other pertinent obligations, then as a consequence you\n\  
 may not distribute the Program at all.  For example, if a patent\n\  
 license would not permit royalty-free redistribution of the Program by\n\  
 all those who receive copies directly or indirectly through you, then\n\  
 the only way you could satisfy both it and this License would be to\n\  
 refrain entirely from distribution of the Program.\n\  
 \n\  
 If any portion of this section is held invalid or unenforceable under\n\  
 any particular circumstance, the balance of the section is intended to\n\  
 apply and the section as a whole is intended to apply in other\n\  
 circumstances.\n\  
 \n\  
 It is not the purpose of this section to induce you to infringe any\n\  
 patents or other property right claims or to contest validity of any\n\  
 such claims; this section has the sole purpose of protecting the\n\  
 integrity of the free software distribution system, which is\n\  
 implemented by public license practices.  Many people have made\n\  
 generous contributions to the wide range of software distributed\n\  
 through that system in reliance on consistent application of that\n\  
 system; it is up to the author/donor to decide if he or she is willing\n\  
 to distribute software through any other system and a licensee cannot\n\  
 impose that choice.\n\  
 \n\  
 This section is intended to make thoroughly clear what is believed to\n\  
 be a consequence of the rest of this License.\n\  
 \n\  
   8. If the distribution and/or use of the Program is restricted in\n\  
 certain countries either by patents or by copyrighted interfaces, the\n\  
 original copyright holder who places the Program under this License\n\  
 may add an explicit geographical distribution limitation excluding\n\  
 those countries, so that distribution is permitted only in or among\n\  
 countries not thus excluded.  In such case, this License incorporates\n\  
 the limitation as if written in the body of this License.\n\  
 \n\  
   9. The Free Software Foundation may publish revised and/or new versions\n\  
 of the General Public License from time to time.  Such new versions will\n\  
 be similar in spirit to the present version, but may differ in detail to\n\  
 address new problems or concerns.\n\  
 \n\  
 Each version is given a distinguishing version number.  If the Program\n\  
 specifies a version number of this License which applies to it and \"any\n\  
 later version\", you have the option of following the terms and conditions\n\  
 either of that version or of any later version published by the Free\n\  
 Software Foundation.  If the Program does not specify a version number of\n\  
 this License, you may choose any version ever published by the Free Software\n\  
 Foundation.\n\  
 \n\  
   10. If you wish to incorporate parts of the Program into other free\n\  
 programs whose distribution conditions are different, write to the author\n\  
 to ask for permission.  For software which is copyrighted by the Free\n\  
 Software Foundation, write to the Free Software Foundation; we sometimes\n\  
 make exceptions for this.  Our decision will be guided by the two goals\n\  
 of preserving the free status of all derivatives of our free software and\n\  
 of promoting the sharing and reuse of software generally.\n");  
 }  
   
 extern void warranty(environment *env)  
 {  
   printf("                          NO WARRANTY\n\  
 \n\  
   11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY\n\  
 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN\n\  
 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES\n\  
 PROVIDE THE PROGRAM \"AS IS\" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED\n\  
 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF\n\  
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS\n\  
 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE\n\  
 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,\n\  
 REPAIR OR CORRECTION.\n\  
 \n\  
   12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING\n\  
 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR\n\  
 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,\n\  
 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING\n\  
 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED\n\  
 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY\n\  
 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER\n\  
 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE\n\  
 POSSIBILITY OF SUCH DAMAGES.\n");  
 }  
   
 /* Discard the top element of the stack. */  
 extern void toss(environment *env)  
 {  
   if(env->head->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
1035    }    }
     
   env->head= CDR(env->head); /* Remove the top stack item */  
 }  
1036    
1037      va_end(ap);
1038    
1039      env->err= errval;
1040      return errval;
1041    }
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