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revision 1.131 by masse, Tue Aug 5 09:09:51 2003 UTC revision 1.132 by masse, Fri Aug 8 14:20:49 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    
53  void printerr(const char* in_string)  void printerr(const char* in_string)
54  {  {
55    fprintf(stderr, "Err: %s\n", in_string);    fprintf(stderr, "Err: %s\n", in_string);
56  }  }
57    
58    
59  /* 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. */
60  symbol **hash(hashtbl in_hashtbl, const char *in_string)  symbol **hash(hashtbl in_hashtbl, const char *in_string)
61  {  {
# Line 76  symbol **hash(hashtbl in_hashtbl, const Line 85  symbol **hash(hashtbl in_hashtbl, const
85    }    }
86  }  }
87    
88    
89  /* Create new value */  /* Create new value */
90  value* new_val(environment *env)  value* new_val(environment *env)
91  {  {
# Line 133  extern void gc_init(environment *env) Line 143  extern void gc_init(environment *env)
143    if(env->interactive)    if(env->interactive)
144      printf(".");      printf(".");
145    
   
146    /* Mark values in hashtable */    /* Mark values in hashtable */
147    for(i= 0; i<HASHTBLSIZE; i++)    for(i= 0; i<HASHTBLSIZE; i++)
148      for(tsymb= env->symbols[i]; tsymb!=NULL; tsymb= tsymb->next)      for(tsymb= env->symbols[i]; tsymb!=NULL; tsymb= tsymb->next)
149        if (tsymb->val != NULL)        if (tsymb->val != NULL)
150          gc_mark(tsymb->val);          gc_mark(tsymb->val);
151    
   
152    if(env->interactive)    if(env->interactive)
153      printf(".");      printf(".");
154    
155    env->gc_count= 0;    env->gc_count= 0;
156    
157    while(env->gc_ref!=NULL) {    /* Sweep unused values */    while(env->gc_ref!=NULL) {    /* Sweep unused values */
   
158      if(!(env->gc_ref->item->gc.no_gc)){ /* neither mark nor protect */      if(!(env->gc_ref->item->gc.no_gc)){ /* neither mark nor protect */
159    
160        /* Remove content */        /* Remove content */
# Line 174  extern void gc_init(environment *env) Line 181  extern void gc_init(environment *env)
181        env->gc_ref= titem;        env->gc_ref= titem;
182        continue;        continue;
183      }      }
184    
185  #ifdef DEBUG  #ifdef DEBUG
186      printf("Kept value (%p)", env->gc_ref->item);      printf("Kept value (%p)", env->gc_ref->item);
187      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 230  extern void gc_init(environment *env)
230    
231  }  }
232    
233    
234  inline void gc_maybe(environment *env)  inline void gc_maybe(environment *env)
235  {  {
236    if(env->gc_count < env->gc_limit)    if(env->gc_count < env->gc_limit)
# Line 230  inline void gc_maybe(environment *env) Line 239  inline void gc_maybe(environment *env)
239      return gc_init(env);      return gc_init(env);
240  }  }
241    
242    
243  /* Protect values from GC */  /* Protect values from GC */
244  void protect(value *val)  void protect(value *val)
245  {  {
# Line 244  void protect(value *val) Line 254  void protect(value *val)
254    }    }
255  }  }
256    
257    
258  /* Unprotect values from GC */  /* Unprotect values from GC */
259  void unprotect(value *val)  void unprotect(value *val)
260  {  {
# Line 258  void unprotect(value *val) Line 269  void unprotect(value *val)
269    }    }
270  }  }
271    
272    
273  /* Push a value onto the stack */  /* Push a value onto the stack */
274  void push_val(environment *env, value *val)  void push_val(environment *env, value *val)
275  {  {
# Line 272  void push_val(environment *env, value *v Line 284  void push_val(environment *env, value *v
284    env->head= new_value;    env->head= new_value;
285  }  }
286    
287    
288  /* Push an integer onto the stack */  /* Push an integer onto the stack */
289  void push_int(environment *env, int in_val)  void push_int(environment *env, int in_val)
290  {  {
# Line 283  void push_int(environment *env, int in_v Line 296  void push_int(environment *env, int in_v
296    push_val(env, new_value);    push_val(env, new_value);
297  }  }
298    
299    
300  /* Push a floating point number onto the stack */  /* Push a floating point number onto the stack */
301  void push_float(environment *env, float in_val)  void push_float(environment *env, float in_val)
302  {  {
# Line 294  void push_float(environment *env, float Line 308  void push_float(environment *env, float
308    push_val(env, new_value);    push_val(env, new_value);
309  }  }
310    
311    
312  /* Copy a string onto the stack. */  /* Copy a string onto the stack. */
313  void push_cstring(environment *env, const char *in_string)  void push_cstring(environment *env, const char *in_string)
314  {  {
# Line 309  void push_cstring(environment *env, cons Line 324  void push_cstring(environment *env, cons
324    push_val(env, new_value);    push_val(env, new_value);
325  }  }
326    
327    
328  /* Mangle a symbol name to a valid C identifier name */  /* Mangle a symbol name to a valid C identifier name */
329  char *mangle_str(const char *old_string)  char *mangle_str(const char *old_string)
330  {  {
# Line 319  char *mangle_str(const char *old_string) Line 335  char *mangle_str(const char *old_string)
335    assert(new_string != NULL);    assert(new_string != NULL);
336    strcpy(new_string, "sx_");    /* Stack eXternal */    strcpy(new_string, "sx_");    /* Stack eXternal */
337    current= new_string+3;    current= new_string+3;
338    
339    while(old_string[0] != '\0'){    while(old_string[0] != '\0'){
340      current[0]= validchars[(unsigned char)(old_string[0])/16];      current[0]= validchars[(unsigned char)(old_string[0])/16];
341      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 347  char *mangle_str(const char *old_string)
347    return new_string;            /* The caller must free() it */    return new_string;            /* The caller must free() it */
348  }  }
349    
350    
351  /* Push a symbol onto the stack. */  /* Push a symbol onto the stack. */
352  void push_sym(environment *env, const char *in_string)  void push_sym(environment *env, const char *in_string)
353  {  {
# Line 399  void push_sym(environment *env, const ch Line 417  void push_sym(environment *env, const ch
417    unprotect(new_value); unprotect(new_fvalue);    unprotect(new_value); unprotect(new_fvalue);
418  }  }
419    
420    
421  /* Print a value */  /* Print a value */
422  void print_val(environment *env, value *val, int noquote, stackitem *stack, FILE *stream)  void print_val(environment *env, value *val, int noquote, stackitem *stack,
423                   FILE *stream)
424  {  {
425    stackitem *titem, *tstack;    stackitem *titem, *tstack;
426    int depth;    int depth;
# Line 470  void print_val(environment *env, value * Line 490  void print_val(environment *env, value *
490        return;        return;
491      }      }
492      tstack= stack;      tstack= stack;
493    
494      do {      do {
495        titem=malloc(sizeof(stackitem));        titem=malloc(sizeof(stackitem));
496        assert(titem != NULL);        assert(titem != NULL);
# Line 480  void print_val(environment *env, value * Line 501  void print_val(environment *env, value *
501           printing this value */           printing this value */
502        titem=tstack;        titem=tstack;
503        depth=0;        depth=0;
504    
505        while(titem != NULL && titem->item != CAR(val)){        while(titem != NULL && titem->item != CAR(val)){
506          titem=titem->next;          titem=titem->next;
507          depth++;          depth++;
508        }        }
509    
510        if(titem != NULL){        /* If we found it on the stack, */        if(titem != NULL){        /* If we found it on the stack, */
511          if(fprintf(stream, "#%d#", depth) < 0){ /* print a depth reference */          if(fprintf(stream, "#%d#", depth) < 0){ /* print a depth reference */
512            perror("print_val");            perror("print_val");
# Line 494  void print_val(environment *env, value * Line 517  void print_val(environment *env, value *
517        } else {        } else {
518          print_val(env, CAR(val), noquote, tstack, stream);          print_val(env, CAR(val), noquote, tstack, stream);
519        }        }
520    
521        val= CDR(val);        val= CDR(val);
522        switch(val->type){        switch(val->type){
523        case empty:        case empty:
# Line 503  void print_val(environment *env, value * Line 527  void print_val(environment *env, value *
527             printing this value */             printing this value */
528          titem=tstack;          titem=tstack;
529          depth=0;          depth=0;
530    
531          while(titem != NULL && titem->item != val){          while(titem != NULL && titem->item != val){
532            titem=titem->next;            titem=titem->next;
533            depth++;            depth++;
# Line 550  void print_val(environment *env, value * Line 575  void print_val(environment *env, value *
575    }    }
576  }  }
577    
578    
579  /* Swap the two top elements on the stack. */  /* Swap the two top elements on the stack. */
580  extern void swap(environment *env)  extern void swap(environment *env)
581  {  {
# Line 566  extern void swap(environment *env) Line 592  extern void swap(environment *env)
592    CDR(env->head)= temp;    CDR(env->head)= temp;
593  }  }
594    
595    
596  /* Recall a value from a symbol, if bound */  /* Recall a value from a symbol, if bound */
597  extern void rcl(environment *env)  extern void rcl(environment *env)
598  {  {
# Line 592  extern void rcl(environment *env) Line 619  extern void rcl(environment *env)
619    push_val(env, val);           /* Return the symbol's bound value */    push_val(env, val);           /* Return the symbol's bound value */
620    swap(env);    swap(env);
621    if(env->err) return;    if(env->err) return;
622    toss(env);                    /* toss the symbol */    env->head= CDR(env->head);
   if(env->err) return;  
623  }  }
624    
625    
# Line 629  extern void eval(environment *env) Line 655  extern void eval(environment *env)
655      /* If it's a lone function value, run it */      /* If it's a lone function value, run it */
656    case func:    case func:
657      in_func= CAR(env->head)->content.func;      in_func= CAR(env->head)->content.func;
658      toss(env);      env->head= CDR(env->head);
     if(env->err) return;  
659      return in_func(env);      return in_func(env);
660    
661      /* If it's a list */      /* If it's a list */
# Line 638  extern void eval(environment *env) Line 663  extern void eval(environment *env)
663      temp_val= CAR(env->head);      temp_val= CAR(env->head);
664      protect(temp_val);      protect(temp_val);
665    
666      toss(env); if(env->err) return;      env->head= CDR(env->head);
667      iterator= temp_val;      iterator= temp_val;
668            
669      while(iterator->type != empty) {      while(iterator->type != empty) {
670        push_val(env, CAR(iterator));        push_val(env, CAR(iterator));
671                
672        if(CAR(env->head)->type==symb       if(CAR(env->head)->type==symb
673           && CAR(env->head)->content.sym->id[0]==';') {           && CAR(env->head)->content.sym->id[0]==';') {
674          toss(env);          env->head= CDR(env->head);
         if(env->err) return;  
675                    
676          if(CDR(iterator)->type == empty){          if(CDR(iterator)->type == empty){
677            goto eval_start;            goto eval_start;
# Line 667  extern void eval(environment *env) Line 691  extern void eval(environment *env)
691      return;      return;
692    
693    case empty:    case empty:
694      toss(env);      env->head= CDR(env->head);
695    case integer:    case integer:
696    case tfloat:    case tfloat:
697    case string:    case string:
# Line 676  extern void eval(environment *env) Line 700  extern void eval(environment *env)
700    }    }
701  }  }
702    
 /* 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);  
 }  
703    
704  /* Internal forget function */  /* Internal forget function */
705  void forget_sym(symbol **hash_entry)  void forget_sym(symbol **hash_entry)
# Line 738  void forget_sym(symbol **hash_entry) Line 713  void forget_sym(symbol **hash_entry)
713    free(temp);    free(temp);
714  }  }
715    
 /* 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);  
 }  
716    
717  int main(int argc, char **argv)  int main(int argc, char **argv)
718  {  {
719    environment myenv;    environment myenv;
   
720    int c;                        /* getopt option character */    int c;                        /* getopt option character */
721    
722  #ifdef __linux__  #ifdef __linux__
# Line 797  int main(int argc, char **argv) Line 751  int main(int argc, char **argv)
751      }      }
752    }    }
753    
754    if(myenv.interactive) {    if(myenv.interactive)
755      printf("Stack version $Revision$\n\      printf(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");  
   }  
756    
757    while(1) {    while(1) {
758      if(myenv.in_string==NULL) {      if(myenv.in_string==NULL) {
# Line 825  under certain conditions; type 'copying; Line 774  under certain conditions; type 'copying;
774      } else if(myenv.head->type!=empty      } else if(myenv.head->type!=empty
775                && CAR(myenv.head)->type==symb                && CAR(myenv.head)->type==symb
776                && CAR(myenv.head)->content.sym->id[0] == ';') {                && CAR(myenv.head)->content.sym->id[0] == ';') {
777        toss(&myenv); if(myenv.err) continue;        if(myenv.head->type != empty)
778            myenv.head= CDR(myenv.head);
779        eval(&myenv);        eval(&myenv);
780      } else {      } else {
781        gc_maybe(&myenv);        gc_maybe(&myenv);
# Line 835  under certain conditions; type 'copying; Line 785  under certain conditions; type 'copying;
785    return EXIT_FAILURE;    return EXIT_FAILURE;
786  }  }
787    
788    
789  /* Return copy of a value */  /* Return copy of a value */
790  value *copy_val(environment *env, value *old_value)  value *copy_val(environment *env, value *old_value)
791  {  {
# Line 872  value *copy_val(environment *env, value Line 823  value *copy_val(environment *env, value
823    return new_value;    return new_value;
824  }  }
825    
826    
827  /* read a line from a stream; used by readline */  /* read a line from a stream; used by readline */
828  void readlinestream(environment *env, FILE *stream)  void readlinestream(environment *env, FILE *stream)
829  {  {
# Line 888  void readlinestream(environment *env, FI Line 840  void readlinestream(environment *env, FI
840    }    }
841  }  }
842    
843    
844  /* Reverse (flip) a list */  /* Reverse (flip) a list */
845  extern void rev(environment *env)  extern void rev(environment *env)
846  {  {
# Line 919  extern void rev(environment *env) Line 872  extern void rev(environment *env)
872    CAR(env->head)= new_head;    CAR(env->head)= new_head;
873  }  }
874    
875    
876  /* Make a list. */  /* Make a list. */
877  extern void pack(environment *env)  extern void pack(environment *env)
878  {  {
# Line 931  extern void pack(environment *env) Line 885  extern void pack(environment *env)
885       || (CAR(iterator)->type==symb       || (CAR(iterator)->type==symb
886       && CAR(iterator)->content.sym->id[0]=='[')) {       && CAR(iterator)->content.sym->id[0]=='[')) {
887      temp= ending;      temp= ending;
888      toss(env);      if(env->head->type != empty)
889          env->head= CDR(env->head);
890    } else {    } else {
891      /* Search for first delimiter */      /* Search for first delimiter */
892      while(CDR(iterator)->type != empty      while(CDR(iterator)->type != empty
# Line 945  extern void pack(environment *env) Line 900  extern void pack(environment *env)
900      CDR(iterator)= ending;      CDR(iterator)= ending;
901    
902      if(env->head->type != empty)      if(env->head->type != empty)
903        toss(env);        env->head= CDR(env->head);
904    }    }
905    
906    /* Push list */    /* Push list */
# Line 954  extern void pack(environment *env) Line 909  extern void pack(environment *env)
909    rev(env);    rev(env);
910  }  }
911    
912    
913  /* read from a stream; used by "read" and "readport" */  /* read from a stream; used by "read" and "readport" */
914  void readstream(environment *env, FILE *stream)  void readstream(environment *env, FILE *stream)
915  {  {
# Line 989  void readstream(environment *env, FILE * Line 945  void readstream(environment *env, FILE *
945      assert(env->in_string != NULL);      assert(env->in_string != NULL);
946      env->free_string= env->in_string; /* Save the original pointer */      env->free_string= env->in_string; /* Save the original pointer */
947      strcpy(env->in_string, CAR(env->head)->content.string);      strcpy(env->in_string, CAR(env->head)->content.string);
948      toss(env); if(env->err) return;      env->head= CDR(env->head);
949    }    }
950        
951    inlength= strlen(env->in_string)+1;    inlength= strlen(env->in_string)+1;
# Line 1040  void readstream(environment *env, FILE * Line 996  void readstream(environment *env, FILE *
996    if(depth)    if(depth)
997      return readstream(env, env->inputstream);      return readstream(env, env->inputstream);
998  }  }
   
 extern void copying(environment *env)  
 {  
   printf("                  GNU GENERAL PUBLIC LICENSE\n\  
                        Version 2, June 1991\n\  
 \n\  
  Copyright (C) 1989, 1991 Free Software Foundation, Inc.\n\  
      59 Temple Place, Suite 330, Boston, MA  02111-1307  USA\n\  
  Everyone is permitted to copy and distribute verbatim copies\n\  
  of this license document, but changing it is not allowed.\n\  
 \n\  
                             Preamble\n\  
 \n\  
   The licenses for most software are designed to take away your\n\  
 freedom to share and change it.  By contrast, the GNU General Public\n\  
 License is intended to guarantee your freedom to share and change free\n\  
 software--to make sure the software is free for all its users.  This\n\  
 General Public License applies to most of the Free Software\n\  
 Foundation's software and to any other program whose authors commit to\n\  
 using it.  (Some other Free Software Foundation software is covered by\n\  
 the GNU Library General Public License instead.)  You can apply it to\n\  
 your programs, too.\n\  
 \n\  
   When we speak of free software, we are referring to freedom, not\n\  
 price.  Our General Public Licenses are designed to make sure that you\n\  
 have the freedom to distribute copies of free software (and charge for\n\  
 this service if you wish), that you receive source code or can get it\n\  
 if you want it, that you can change the software or use pieces of it\n\  
 in new free programs; and that you know you can do these things.\n\  
 \n\  
   To protect your rights, we need to make restrictions that forbid\n\  
 anyone to deny you these rights or to ask you to surrender the rights.\n\  
 These restrictions translate to certain responsibilities for you if you\n\  
 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;  
   }  
     
   env->head= CDR(env->head); /* Remove the top stack item */  
 }  
   
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