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revision 1.110 by teddy, Sat Mar 16 09:12:39 2002 UTC revision 1.113 by teddy, Sun Mar 17 00:55:58 2002 UTC
# Line 20  Line 20 
20               Teddy Hogeborn <teddy@fukt.bth.se>               Teddy Hogeborn <teddy@fukt.bth.se>
21  */  */
22    
23  #define CAR(X) X->content.c->car  #define CAR(X) (X->content.c->car)
24  #define CDR(X) X->content.c->cdr  #define CDR(X) (X->content.c->cdr)
25    
26  /* printf, sscanf, fgets, fprintf, fopen, perror */  /* printf, sscanf, fgets, fprintf, fopen, perror */
27  #include <stdio.h>  #include <stdio.h>
# Line 60  void init_env(environment *env) Line 60  void init_env(environment *env)
60    env->gc_count= 0;    env->gc_count= 0;
61    env->gc_ref= NULL;    env->gc_ref= NULL;
62    
63    env->head= NULL;    env->head= new_val(env);
64      env->head->type= empty;
65    for(i= 0; i<HASHTBLSIZE; i++)    for(i= 0; i<HASHTBLSIZE; i++)
66      env->symbols[i]= NULL;      env->symbols[i]= NULL;
67    env->err= 0;    env->err= 0;
# Line 78  void printerr(const char* in_string) Line 79  void printerr(const char* in_string)
79  /* Discard the top element of the stack. */  /* Discard the top element of the stack. */
80  extern void toss(environment *env)  extern void toss(environment *env)
81  {  {
82    if(env->head==NULL) {    if(env->head->type==empty) {
83      printerr("Too Few Arguments");      printerr("Too Few Arguments");
84      env->err= 1;      env->err= 1;
85      return;      return;
# Line 352  extern void mangle(environment *env) Line 353  extern void mangle(environment *env)
353  {  {
354    char *new_string;    char *new_string;
355    
356    if(env->head==NULL) {    if(env->head->type==empty) {
357      printerr("Too Few Arguments");      printerr("Too Few Arguments");
358      env->err= 1;      env->err= 1;
359      return;      return;
# Line 449  extern void nl() Line 450  extern void nl()
450  /* Gets the type of a value */  /* Gets the type of a value */
451  extern void type(environment *env)  extern void type(environment *env)
452  {  {
453    int typenum;    if(env->head->type==empty) {
   
   if(env->head==NULL) {  
454      printerr("Too Few Arguments");      printerr("Too Few Arguments");
455      env->err= 1;      env->err= 1;
456      return;      return;
457    }    }
458    
459    typenum= CAR(env->head)->type;    switch(CAR(env->head)->type){
460    toss(env);    case empty:
461    switch(typenum){      push_sym(env, "empty");
462        break;
463    case integer:    case integer:
464      push_sym(env, "integer");      push_sym(env, "integer");
465      break;      break;
# Line 476  extern void type(environment *env) Line 476  extern void type(environment *env)
476      push_sym(env, "function");      push_sym(env, "function");
477      break;      break;
478    case tcons:    case tcons:
479      push_sym(env, "list");      push_sym(env, "pair");
480      break;      break;
481    }    }
482      swap(env);
483      if (env->err) return;
484      toss(env);
485  }      }    
486    
487  /* Prints the top element of the stack. */  /* Prints the top element of the stack. */
488  void print_h(value *stack_head, int noquote)  void print_val(value *val, int noquote)
489  {  {
490    switch(CAR(stack_head)->type) {    switch(val->type) {
491      case empty:
492        printf("[]");
493        break;
494    case integer:    case integer:
495      printf("%d", CAR(stack_head)->content.i);      printf("%d", val->content.i);
496      break;      break;
497    case tfloat:    case tfloat:
498      printf("%f", CAR(stack_head)->content.f);      printf("%f", val->content.f);
499      break;      break;
500    case string:    case string:
501      if(noquote)      if(noquote)
502        printf("%s", (char*)CAR(stack_head)->content.ptr);        printf("%s", (char*)(val->content.ptr));
503      else      else
504        printf("\"%s\"", (char*)CAR(stack_head)->content.ptr);        printf("\"%s\"", (char*)(val->content.ptr));
505      break;      break;
506    case symb:    case symb:
507      printf("%s", CAR(stack_head)->content.sym->id);      printf("%s", val->content.sym->id);
508      break;      break;
509    case func:    case func:
510      printf("#<function %p>", (funcp)(CAR(stack_head)->content.ptr));      printf("#<function %p>", (funcp)(val->content.ptr));
511      break;      break;
512    case tcons:    case tcons:
     /* A list is just a stack, so make stack_head point to it */  
     stack_head= CAR(stack_head);  
513      printf("[ ");      printf("[ ");
514      while(stack_head != NULL) {      do {
515        print_h(stack_head, noquote);        print_val(CAR(val), noquote);
516        printf(" ");        switch(CDR(val)->type){
517        stack_head= CDR(stack_head);        case empty:
518      }          break;
519      printf("]");        case tcons:
520            printf(" ");
521            break;
522          default:
523            printf(" . ");          /* Improper list */
524            print_val(CDR(val), noquote);
525          }
526          val= CDR(val);
527        } while(val->type == tcons);
528        printf(" ]");
529      break;      break;
530    }    }
531  }  }
532    
533  extern void print_(environment *env)  extern void print_(environment *env)
534  {  {
535    if(env->head==NULL) {    if(env->head->type==empty) {
536      printerr("Too Few Arguments");      printerr("Too Few Arguments");
537      env->err= 1;      env->err= 1;
538      return;      return;
539    }    }
540    print_h(env->head, 0);    print_val(CAR(env->head), 0);
541    nl();    nl();
542  }  }
543    
# Line 538  extern void print(environment *env) Line 551  extern void print(environment *env)
551    
552  extern void princ_(environment *env)  extern void princ_(environment *env)
553  {  {
554    if(env->head==NULL) {    if(env->head->type==empty) {
555      printerr("Too Few Arguments");      printerr("Too Few Arguments");
556      env->err= 1;      env->err= 1;
557      return;      return;
558    }    }
559    print_h(env->head, 1);    print_val(CAR(env->head), 1);
560  }  }
561    
562  /* Prints the top element of the stack and then discards it. */  /* Prints the top element of the stack and then discards it. */
# Line 557  extern void princ(environment *env) Line 570  extern void princ(environment *env)
570  /* Only to be called by function printstack. */  /* Only to be called by function printstack. */
571  void print_st(value *stack_head, long counter)  void print_st(value *stack_head, long counter)
572  {  {
573    if(CDR(stack_head) != NULL)    if(CDR(stack_head)->type != empty)
574      print_st(CDR(stack_head), counter+1);      print_st(CDR(stack_head), counter+1);
575    printf("%ld: ", counter);    printf("%ld: ", counter);
576    print_h(stack_head, 0);    print_val(CAR(stack_head), 0);
577    nl();    nl();
578  }  }
579    
580  /* Prints the stack. */  /* Prints the stack. */
581  extern void printstack(environment *env)  extern void printstack(environment *env)
582  {  {
583    if(env->head == NULL) {    if(env->head->type == empty) {
584      printf("Stack Empty\n");      printf("Stack Empty\n");
585      return;      return;
586    }    }
# Line 580  extern void swap(environment *env) Line 593  extern void swap(environment *env)
593  {  {
594    value *temp= env->head;    value *temp= env->head;
595        
596    if(env->head==NULL || CDR(env->head)==NULL) {    if(env->head->type == empty || CDR(env->head)->type == empty) {
597      printerr("Too Few Arguments");      printerr("Too Few Arguments");
598      env->err=1;      env->err=1;
599      return;      return;
# Line 596  extern void rot(environment *env) Line 609  extern void rot(environment *env)
609  {  {
610    value *temp= env->head;    value *temp= env->head;
611        
612    if(env->head==NULL || CDR(env->head)==NULL    if(env->head->type == empty || CDR(env->head)->type == empty
613       || CDR(CDR(env->head))==NULL) {       || CDR(CDR(env->head))->type == empty) {
614      printerr("Too Few Arguments");      printerr("Too Few Arguments");
615      env->err= 1;      env->err= 1;
616      return;      return;
# Line 613  extern void rcl(environment *env) Line 626  extern void rcl(environment *env)
626  {  {
627    value *val;    value *val;
628    
629    if(env->head==NULL) {    if(env->head->type==empty) {
630      printerr("Too Few Arguments");      printerr("Too Few Arguments");
631      env->err= 1;      env->err= 1;
632      return;      return;
# Line 651  extern void eval(environment *env) Line 664  extern void eval(environment *env)
664    
665    gc_maybe(env);    gc_maybe(env);
666    
667    if(env->head==NULL) {    if(env->head->type==empty) {
668      printerr("Too Few Arguments");      printerr("Too Few Arguments");
669      env->err= 1;      env->err= 1;
670      return;      return;
# Line 682  extern void eval(environment *env) Line 695  extern void eval(environment *env)
695      toss(env); if(env->err) return;      toss(env); if(env->err) return;
696      iterator= temp_val;      iterator= temp_val;
697            
698      while(iterator!=NULL) {      while(iterator->type != empty) {
699        push_val(env, CAR(iterator));        push_val(env, CAR(iterator));
700                
701        if(CAR(env->head)->type==symb        if(CAR(env->head)->type==symb
# Line 690  extern void eval(environment *env) Line 703  extern void eval(environment *env)
703          toss(env);          toss(env);
704          if(env->err) return;          if(env->err) return;
705                    
706          if(CDR(iterator)==NULL){          if(CDR(iterator)->type == empty){
707            goto eval_start;            goto eval_start;
708          }          }
709          eval(env);          eval(env);
710          if(env->err) return;          if(env->err) return;
711        }        }
712        if (CDR(iterator)==NULL || CDR(iterator)->type == tcons)        if (CDR(iterator)->type == empty || CDR(iterator)->type == tcons)
713          iterator= CDR(iterator);          iterator= CDR(iterator);
714        else {        else {
715          printerr("Bad Argument Type"); /* Improper list */          printerr("Bad Argument Type"); /* Improper list */
# Line 717  extern void rev(environment *env) Line 730  extern void rev(environment *env)
730  {  {
731    value *old_head, *new_head, *item;    value *old_head, *new_head, *item;
732    
733    if(env->head==NULL) {    if(env->head->type==empty) {
734      printerr("Too Few Arguments");      printerr("Too Few Arguments");
735      env->err= 1;      env->err= 1;
736      return;      return;
737    }    }
738    
739      if(CAR(env->head)->type==empty)
740        return;                     /* Don't reverse an empty list */
741    
742    if(CAR(env->head)->type!=tcons) {    if(CAR(env->head)->type!=tcons) {
743      printerr("Bad Argument Type");      printerr("Bad Argument Type");
744      env->err= 2;      env->err= 2;
# Line 730  extern void rev(environment *env) Line 746  extern void rev(environment *env)
746    }    }
747    
748    old_head= CAR(env->head);    old_head= CAR(env->head);
749    new_head= NULL;    new_head= new_val(env);
750    while(old_head!=NULL) {    new_head->type= empty;
751      while(old_head->type != empty) {
752      item= old_head;      item= old_head;
753      old_head= CDR(old_head);      old_head= CDR(old_head);
754      CDR(item)= new_head;      CDR(item)= new_head;
# Line 743  extern void rev(environment *env) Line 760  extern void rev(environment *env)
760  /* Make a list. */  /* Make a list. */
761  extern void pack(environment *env)  extern void pack(environment *env)
762  {  {
763    value *iterator, *temp;    value *iterator, *temp, *ending;
764    
765      ending=new_val(env);
766      ending->type=empty;
767    
768    iterator= env->head;    iterator= env->head;
769    if(iterator==NULL    if(iterator->type == empty
770       || (CAR(iterator)->type==symb       || (CAR(iterator)->type==symb
771       && CAR(iterator)->content.sym->id[0]=='[')) {       && CAR(iterator)->content.sym->id[0]=='[')) {
772      temp= NULL;      temp= ending;
773      toss(env);      toss(env);
774    } else {    } else {
775      /* Search for first delimiter */      /* Search for first delimiter */
776      while(CDR(iterator)!=NULL      while(CDR(iterator)->type != empty
777            && (CAR(CDR(iterator))->type!=symb            && (CAR(CDR(iterator))->type!=symb
778             || CAR(CDR(iterator))->content.sym->id[0]!='['))             || CAR(CDR(iterator))->content.sym->id[0]!='['))
779        iterator= CDR(iterator);        iterator= CDR(iterator);
# Line 761  extern void pack(environment *env) Line 781  extern void pack(environment *env)
781      /* Extract list */      /* Extract list */
782      temp= env->head;      temp= env->head;
783      env->head= CDR(iterator);      env->head= CDR(iterator);
784      CDR(iterator)= NULL;      CDR(iterator)= ending;
785    
786      if(env->head!=NULL)      if(env->head->type != empty)
787        toss(env);        toss(env);
788    }    }
789    
# Line 779  extern void expand(environment *env) Line 799  extern void expand(environment *env)
799    value *temp, *new_head;    value *temp, *new_head;
800    
801    /* Is top element a list? */    /* Is top element a list? */
802    if(env->head==NULL) {    if(env->head->type==empty) {
803      printerr("Too Few Arguments");      printerr("Too Few Arguments");
804      env->err= 1;      env->err= 1;
805      return;      return;
# Line 802  extern void expand(environment *env) Line 822  extern void expand(environment *env)
822    toss(env);    toss(env);
823    
824    /* Find the end of the list */    /* Find the end of the list */
825    while(CDR(temp)->content.ptr != NULL) {    while(CDR(temp)->type != empty) {
826      if (CDR(temp)->type == tcons)      if (CDR(temp)->type == tcons)
827        temp= CDR(temp);        temp= CDR(temp);
828      else {      else {
# Line 823  extern void eq(environment *env) Line 843  extern void eq(environment *env)
843  {  {
844    void *left, *right;    void *left, *right;
845    
846    if(env->head==NULL || CDR(env->head)==NULL) {    if(env->head->type==empty || CDR(env->head)->type==empty) {
847      printerr("Too Few Arguments");      printerr("Too Few Arguments");
848      env->err= 1;      env->err= 1;
849      return;      return;
# Line 841  extern void not(environment *env) Line 861  extern void not(environment *env)
861  {  {
862    int val;    int val;
863    
864    if(env->head==NULL) {    if(env->head->type==empty) {
865      printerr("Too Few Arguments");      printerr("Too Few Arguments");
866      env->err= 1;      env->err= 1;
867      return;      return;
# Line 872  extern void def(environment *env) Line 892  extern void def(environment *env)
892    symbol *sym;    symbol *sym;
893    
894    /* Needs two values on the stack, the top one must be a symbol */    /* Needs two values on the stack, the top one must be a symbol */
895    if(env->head==NULL || CDR(env->head)==NULL) {    if(env->head->type==empty || CDR(env->head)->type==empty) {
896      printerr("Too Few Arguments");      printerr("Too Few Arguments");
897      env->err= 1;      env->err= 1;
898      return;      return;
# Line 926  extern void quit(environment *env) Line 946  extern void quit(environment *env)
946  /* Clear stack */  /* Clear stack */
947  extern void clear(environment *env)  extern void clear(environment *env)
948  {  {
949    while(env->head!=NULL)    while(env->head->type != empty)
950      toss(env);      toss(env);
951  }  }
952    
# Line 965  void forget_sym(symbol **hash_entry) Line 985  void forget_sym(symbol **hash_entry)
985  extern void forget(environment *env)  extern void forget(environment *env)
986  {  {
987    char* sym_id;    char* sym_id;
   value *stack_head= env->head;  
988    
989    if(stack_head==NULL) {    if(env->head->type==empty) {
990      printerr("Too Few Arguments");      printerr("Too Few Arguments");
991      env->err= 1;      env->err= 1;
992      return;      return;
993    }    }
994        
995    if(CAR(stack_head)->type!=symb) {    if(CAR(env->head)->type!=symb) {
996      printerr("Bad Argument Type");      printerr("Bad Argument Type");
997      env->err= 2;      env->err= 2;
998      return;      return;
999    }    }
1000    
1001    sym_id= CAR(stack_head)->content.sym->id;    sym_id= CAR(env->head)->content.sym->id;
1002    toss(env);    toss(env);
1003    
1004    return forget_sym(hash(env->symbols, sym_id));    return forget_sym(hash(env->symbols, sym_id));
# Line 1053  under certain conditions; type 'copying; Line 1072  under certain conditions; type 'copying;
1072      if (myenv.err==4) {         /* EOF */      if (myenv.err==4) {         /* EOF */
1073        myenv.err=0;        myenv.err=0;
1074        quit(&myenv);        quit(&myenv);
1075      } else if(myenv.head!=NULL      } else if(myenv.head->type!=empty
1076                && CAR(myenv.head)->type==symb                && CAR(myenv.head)->type==symb
1077                && CAR(myenv.head)->content.sym->id[0]                && CAR(myenv.head)->content.sym->id[0]
1078                ==';') {                ==';') {
# Line 1075  extern void sx_2b(environment *env) Line 1094  extern void sx_2b(environment *env)
1094    char* new_string;    char* new_string;
1095    value *a_val, *b_val;    value *a_val, *b_val;
1096    
1097    if(env->head==NULL || CDR(env->head)==NULL) {    if(env->head->type==empty || CDR(env->head)->type==empty) {
1098      printerr("Too Few Arguments");      printerr("Too Few Arguments");
1099      env->err= 1;      env->err= 1;
1100      return;      return;
# Line 1153  extern void sx_2d(environment *env) Line 1172  extern void sx_2d(environment *env)
1172    int a, b;    int a, b;
1173    float fa, fb;    float fa, fb;
1174    
1175    if(env->head==NULL || CDR(env->head)==NULL) {    if(env->head->type==empty || CDR(env->head)->type==empty) {
1176      printerr("Too Few Arguments");      printerr("Too Few Arguments");
1177      env->err=1;      env->err=1;
1178      return;      return;
# Line 1213  extern void sx_3e(environment *env) Line 1232  extern void sx_3e(environment *env)
1232    int a, b;    int a, b;
1233    float fa, fb;    float fa, fb;
1234    
1235    if(env->head==NULL || CDR(env->head)==NULL) {    if(env->head->type==empty || CDR(env->head)->type==empty) {
1236      printerr("Too Few Arguments");      printerr("Too Few Arguments");
1237      env->err= 1;      env->err= 1;
1238      return;      return;
# Line 1329  value *copy_val(environment *env, value Line 1348  value *copy_val(environment *env, value
1348  /* "dup"; duplicates an item on the stack */  /* "dup"; duplicates an item on the stack */
1349  extern void sx_647570(environment *env)  extern void sx_647570(environment *env)
1350  {  {
1351    if(env->head==NULL) {    if(env->head->type==empty) {
1352      printerr("Too Few Arguments");      printerr("Too Few Arguments");
1353      env->err= 1;      env->err= 1;
1354      return;      return;
# Line 1342  extern void sx_6966(environment *env) Line 1361  extern void sx_6966(environment *env)
1361  {  {
1362    int truth;    int truth;
1363    
1364    if(env->head==NULL || CDR(env->head)==NULL) {    if(env->head->type==empty || CDR(env->head)->type==empty) {
1365      printerr("Too Few Arguments");      printerr("Too Few Arguments");
1366      env->err= 1;      env->err= 1;
1367      return;      return;
# Line 1373  extern void ifelse(environment *env) Line 1392  extern void ifelse(environment *env)
1392  {  {
1393    int truth;    int truth;
1394    
1395    if(env->head==NULL || CDR(env->head)==NULL    if(env->head->type==empty || CDR(env->head)->type==empty
1396       || CDR(CDR(env->head))==NULL) {       || CDR(CDR(env->head))->type==empty) {
1397      printerr("Too Few Arguments");      printerr("Too Few Arguments");
1398      env->err= 1;      env->err= 1;
1399      return;      return;
# Line 1406  extern void ifelse(environment *env) Line 1425  extern void ifelse(environment *env)
1425    
1426  extern void sx_656c7365(environment *env)  extern void sx_656c7365(environment *env)
1427  {  {
1428    if(env->head==NULL || CDR(env->head)==NULL    if(env->head->type==empty || CDR(env->head)->type==empty
1429       || CDR(CDR(env->head))==NULL || CDR(CDR(CDR(env->head)))==NULL       || CDR(CDR(env->head))->type==empty || CDR(CDR(CDR(env->head)))->type==empty
1430       || CDR(CDR(CDR(CDR(env->head))))==NULL) {       || CDR(CDR(CDR(CDR(env->head))))->type==empty) {
1431      printerr("Too Few Arguments");      printerr("Too Few Arguments");
1432      env->err= 1;      env->err= 1;
1433      return;      return;
# Line 1429  extern void sx_656c7365(environment *env Line 1448  extern void sx_656c7365(environment *env
1448    
1449  extern void then(environment *env)  extern void then(environment *env)
1450  {  {
1451    if(env->head==NULL || CDR(env->head)==NULL    if(env->head->type==empty || CDR(env->head)->type==empty
1452       || CDR(CDR(env->head))==NULL) {       || CDR(CDR(env->head))->type==empty) {
1453      printerr("Too Few Arguments");      printerr("Too Few Arguments");
1454      env->err= 1;      env->err= 1;
1455      return;      return;
# Line 1453  extern void sx_7768696c65(environment *e Line 1472  extern void sx_7768696c65(environment *e
1472    int truth;    int truth;
1473    value *loop, *test;    value *loop, *test;
1474    
1475    if(env->head==NULL || CDR(env->head)==NULL) {    if(env->head->type==empty || CDR(env->head)->type==empty) {
1476      printerr("Too Few Arguments");      printerr("Too Few Arguments");
1477      env->err= 1;      env->err= 1;
1478      return;      return;
# Line 1499  extern void sx_666f72(environment *env) Line 1518  extern void sx_666f72(environment *env)
1518    value *loop;    value *loop;
1519    int foo1, foo2;    int foo1, foo2;
1520    
1521    if(env->head==NULL || CDR(env->head)==NULL    if(env->head->type==empty || CDR(env->head)->type==empty
1522       || CDR(CDR(env->head))==NULL) {       || CDR(CDR(env->head))->type==empty) {
1523      printerr("Too Few Arguments");      printerr("Too Few Arguments");
1524      env->err= 1;      env->err= 1;
1525      return;      return;
# Line 1547  extern void foreach(environment *env) Line 1566  extern void foreach(environment *env)
1566    value *loop, *foo;    value *loop, *foo;
1567    value *iterator;    value *iterator;
1568        
1569    if(env->head==NULL || CDR(env->head)==NULL) {    if(env->head->type==empty || CDR(env->head)->type==empty) {
1570      printerr("Too Few Arguments");      printerr("Too Few Arguments");
1571      env->err= 1;      env->err= 1;
1572      return;      return;
# Line 1590  extern void to(environment *env) Line 1609  extern void to(environment *env)
1609    int ending, start, i;    int ending, start, i;
1610    value *iterator, *temp;    value *iterator, *temp;
1611    
1612    if(env->head==NULL || CDR(env->head)==NULL) {    if(env->head->type==empty || CDR(env->head)->type==empty) {
1613      printerr("Too Few Arguments");      printerr("Too Few Arguments");
1614      env->err= 1;      env->err= 1;
1615      return;      return;
# Line 1620  extern void to(environment *env) Line 1639  extern void to(environment *env)
1639    
1640    iterator= env->head;    iterator= env->head;
1641    
1642    if(iterator==NULL    if(iterator->type==empty
1643       || (CAR(iterator)->type==symb       || (CAR(iterator)->type==symb
1644           && CAR(iterator)->content.sym->id[0]=='[')) {           && CAR(iterator)->content.sym->id[0]=='[')) {
1645      temp= NULL;      temp= NULL;
# Line 1742  extern void beep(environment *env) Line 1761  extern void beep(environment *env)
1761  {  {
1762    int freq, dur, period, ticks;    int freq, dur, period, ticks;
1763    
1764    if(env->head==NULL || CDR(env->head)==NULL) {    if(env->head->type==empty || CDR(env->head)->type==empty) {
1765      printerr("Too Few Arguments");      printerr("Too Few Arguments");
1766      env->err= 1;      env->err= 1;
1767      return;      return;
# Line 1787  extern void sx_77616974(environment *env Line 1806  extern void sx_77616974(environment *env
1806  {  {
1807    int dur;    int dur;
1808    
1809    if(env->head==NULL) {    if(env->head->type==empty) {
1810      printerr("Too Few Arguments");      printerr("Too Few Arguments");
1811      env->err= 1;      env->err= 1;
1812      return;      return;
# Line 1807  extern void sx_77616974(environment *env Line 1826  extern void sx_77616974(environment *env
1826    
1827  extern void copying(environment *env)  extern void copying(environment *env)
1828  {  {
1829    printf("GNU GENERAL PUBLIC LICENSE\n\    printf("                  GNU GENERAL PUBLIC LICENSE\n\
1830                         Version 2, June 1991\n\                         Version 2, June 1991\n\
1831  \n\  \n\
1832   Copyright (C) 1989, 1991 Free Software Foundation, Inc.\n\   Copyright (C) 1989, 1991 Free Software Foundation, Inc.\n\
# Line 2096  extern void sx_2a(environment *env) Line 2115  extern void sx_2a(environment *env)
2115    int a, b;    int a, b;
2116    float fa, fb;    float fa, fb;
2117    
2118    if(env->head==NULL || CDR(env->head)==NULL) {    if(env->head->type==empty || CDR(env->head)->type==empty) {
2119      printerr("Too Few Arguments");      printerr("Too Few Arguments");
2120      env->err= 1;      env->err= 1;
2121      return;      return;
# Line 2156  extern void sx_2f(environment *env) Line 2175  extern void sx_2f(environment *env)
2175    int a, b;    int a, b;
2176    float fa, fb;    float fa, fb;
2177    
2178    if(env->head==NULL || CDR(env->head)==NULL) {    if(env->head->type==empty || CDR(env->head)->type==empty) {
2179      printerr("Too Few Arguments");      printerr("Too Few Arguments");
2180      env->err= 1;      env->err= 1;
2181      return;      return;
# Line 2215  extern void mod(environment *env) Line 2234  extern void mod(environment *env)
2234  {  {
2235    int a, b;    int a, b;
2236    
2237    if(env->head==NULL || CDR(env->head)==NULL) {    if(env->head->type==empty || CDR(env->head)->type==empty) {
2238      printerr("Too Few Arguments");      printerr("Too Few Arguments");
2239      env->err= 1;      env->err= 1;
2240      return;      return;
# Line 2241  extern void sx_646976(environment *env) Line 2260  extern void sx_646976(environment *env)
2260  {  {
2261    int a, b;    int a, b;
2262        
2263    if(env->head==NULL || CDR(env->head)==NULL) {    if(env->head->type==empty || CDR(env->head)->type==empty) {
2264      printerr("Too Few Arguments");      printerr("Too Few Arguments");
2265      env->err= 1;      env->err= 1;
2266      return;      return;
# Line 2261  extern void sx_646976(environment *env) Line 2280  extern void sx_646976(environment *env)
2280    printerr("Bad Argument Type");    printerr("Bad Argument Type");
2281    env->err= 2;    env->err= 2;
2282  }  }
2283    
2284    extern void setcar(environment *env)
2285    {
2286      if(env->head->type==empty || CDR(env->head)->type==empty) {
2287        printerr("Too Few Arguments");
2288        env->err= 1;
2289        return;
2290      }
2291    
2292      if(CDR(env->head)->type!=tcons) {
2293        printerr("Bad Argument Type");
2294        env->err= 2;
2295        return;
2296      }
2297    
2298      CAR(CAR(CDR(env->head)))=CAR(env->head);
2299      toss(env);
2300    }
2301    
2302    extern void setcdr(environment *env)
2303    {
2304      if(env->head->type==empty || CDR(env->head)->type==empty) {
2305        printerr("Too Few Arguments");
2306        env->err= 1;
2307        return;
2308      }
2309    
2310      if(CDR(env->head)->type!=tcons) {
2311        printerr("Bad Argument Type");
2312        env->err= 2;
2313        return;
2314      }
2315    
2316      CDR(CAR(CDR(env->head)))=CAR(env->head);
2317      toss(env);
2318    }
2319    
2320    extern void car(environment *env)
2321    {
2322      if(env->head->type==empty) {
2323        printerr("Too Few Arguments");
2324        env->err= 1;
2325        return;
2326      }
2327    
2328      if(CAR(env->head)->type!=tcons) {
2329        printerr("Bad Argument Type");
2330        env->err= 2;
2331        return;
2332      }
2333    
2334      CAR(env->head)=CAR(CAR(env->head));
2335    }
2336    
2337    extern void cdr(environment *env)
2338    {
2339      if(env->head->type==empty) {
2340        printerr("Too Few Arguments");
2341        env->err= 1;
2342        return;
2343      }
2344    
2345      if(CAR(env->head)->type!=tcons) {
2346        printerr("Bad Argument Type");
2347        env->err= 2;
2348        return;
2349      }
2350    
2351      CAR(env->head)=CDR(CAR(env->head));
2352    }
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