/[cvs]/stack/stack.c
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revision 1.117 by teddy, Wed Mar 20 05:29:29 2002 UTC revision 1.136 by masse, Mon Aug 18 14:39:16 2003 UTC
# Line 21  Line 21 
21               Teddy Hogeborn <teddy@fukt.bth.se>               Teddy Hogeborn <teddy@fukt.bth.se>
22  */  */
23    
24  #define CAR(X) ((X)->content.c->car)  #include "stack.h"
 #define CDR(X) ((X)->content.c->cdr)  
25    
26  /* printf, sscanf, fgets, fprintf, fopen, perror */  const char* start_message= "Stack version $Revision$\n\
27  #include <stdio.h>  Copyright (C) 2002  Mats Alritzson and Teddy Hogeborn\n\
28  /* exit, EXIT_SUCCESS, malloc, free */  Stack comes with ABSOLUTELY NO WARRANTY; for details type 'warranty;'.\n\
29  #include <stdlib.h>  This is free software, and you are welcome to redistribute it\n\
30  /* NULL */  under certain conditions; type 'copying;' for details.";
 #include <stddef.h>  
 /* dlopen, dlsym, dlerror */  
 #include <dlfcn.h>  
 /* strcmp, strcpy, strlen, strcat, strdup */  
 #include <string.h>  
 /* getopt, STDIN_FILENO, STDOUT_FILENO, usleep */  
 #include <unistd.h>  
 /* EX_NOINPUT, EX_USAGE */  
 #include <sysexits.h>  
 /* assert */  
 #include <assert.h>  
31    
 #ifdef __linux__  
 /* mtrace, muntrace */  
 #include <mcheck.h>  
 /* ioctl */  
 #include <sys/ioctl.h>  
 /* KDMKTONE */  
 #include <linux/kd.h>  
 #endif /* __linux__ */  
   
 #include "stack.h"  
32    
33  /* Initialize a newly created environment */  /* Initialize a newly created environment */
34  void init_env(environment *env)  void init_env(environment *env)
# Line 71  void init_env(environment *env) Line 49  void init_env(environment *env)
49    env->interactive= 1;    env->interactive= 1;
50  }  }
51    
 void printerr(const char* in_string)  
 {  
   fprintf(stderr, "Err: %s\n", in_string);  
 }  
52    
53  /* Discard the top element of the stack. */  void printerr(environment *env)
 extern void toss(environment *env)  
54  {  {
55    if(env->head->type==empty) {    char *in_string;
56      printerr("Too Few Arguments");  
57      env->err= 1;    switch(env->err) {
58      case 0:
59      return;      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      case 5:
70        return perror(env->errsymb);
71      default:
72        in_string= "Unknown error";
73        break;
74    }    }
75      
76    env->head= CDR(env->head); /* Remove the top stack item */    fprintf(stderr, "\"%s\":\nErr: %s\n", env->errsymb, in_string);
77  }  }
78    
79    
80  /* Returns a pointer to a pointer to an element in the hash table. */  /* Returns a pointer to a pointer to an element in the hash table. */
81  symbol **hash(hashtbl in_hashtbl, const char *in_string)  symbol **hash(hashtbl in_hashtbl, const char *in_string)
82  {  {
# Line 117  symbol **hash(hashtbl in_hashtbl, const Line 106  symbol **hash(hashtbl in_hashtbl, const
106    }    }
107  }  }
108    
109    
110  /* Create new value */  /* Create new value */
111  value* new_val(environment *env)  value* new_val(environment *env)
112  {  {
113    value *nval= malloc(sizeof(value));    value *nval= malloc(sizeof(value));
114    stackitem *nitem= malloc(sizeof(stackitem));    stackitem *nitem= malloc(sizeof(stackitem));
115    
116      assert(nval != NULL);
117      assert(nitem != NULL);
118    
119    nval->content.ptr= NULL;    nval->content.ptr= NULL;
120    nval->type= empty;    nval->type= empty;
121    
# Line 138  value* new_val(environment *env) Line 131  value* new_val(environment *env)
131    return nval;    return nval;
132  }  }
133    
134    
135  /* Mark values recursively.  /* Mark values recursively.
136     Marked values are not collected by the GC. */     Marked values are not collected by the GC. */
137  inline void gc_mark(value *val)  inline void gc_mark(value *val)
# Line 153  inline void gc_mark(value *val) Line 147  inline void gc_mark(value *val)
147    }    }
148  }  }
149    
 inline void gc_maybe(environment *env)  
 {  
   if(env->gc_count < env->gc_limit)  
     return;  
   else  
     return gc_init(env);  
 }  
150    
151  /* Start GC */  /* Start GC */
152  extern void gc_init(environment *env)  extern void gc_init(environment *env)
# Line 177  extern void gc_init(environment *env) Line 164  extern void gc_init(environment *env)
164    if(env->interactive)    if(env->interactive)
165      printf(".");      printf(".");
166    
   
167    /* Mark values in hashtable */    /* Mark values in hashtable */
168    for(i= 0; i<HASHTBLSIZE; i++)    for(i= 0; i<HASHTBLSIZE; i++)
169      for(tsymb= env->symbols[i]; tsymb!=NULL; tsymb= tsymb->next)      for(tsymb= env->symbols[i]; tsymb!=NULL; tsymb= tsymb->next)
170        if (tsymb->val != NULL)        if (tsymb->val != NULL)
171          gc_mark(tsymb->val);          gc_mark(tsymb->val);
172    
   
173    if(env->interactive)    if(env->interactive)
174      printf(".");      printf(".");
175    
176    env->gc_count= 0;    env->gc_count= 0;
177    
178    while(env->gc_ref!=NULL) {    /* Sweep unused values */    while(env->gc_ref!=NULL) {    /* Sweep unused values */
   
179      if(!(env->gc_ref->item->gc.no_gc)){ /* neither mark nor protect */      if(!(env->gc_ref->item->gc.no_gc)){ /* neither mark nor protect */
180    
181        /* Remove content */        /* Remove content */
182        switch(env->gc_ref->item->type){        switch(env->gc_ref->item->type){
183        case string:        case string:
184          free(env->gc_ref->item->content.ptr);          free(env->gc_ref->item->content.string);
185          break;          break;
186        case tcons:        case tcons:
187          free(env->gc_ref->item->content.c);          free(env->gc_ref->item->content.c);
188          break;          break;
189          case port:
190        case empty:        case empty:
191          case unknown:
192        case integer:        case integer:
193        case tfloat:        case tfloat:
194        case func:        case func:
195        case symb:        case symb:
196          /* Symbol strings are freed when walking the hash table */          /* Symbol strings are freed when walking the hash table */
197            break;
198        }        }
199    
200        free(env->gc_ref->item);  /* Remove from gc_ref */        free(env->gc_ref->item);  /* Remove from gc_ref */
# Line 216  extern void gc_init(environment *env) Line 203  extern void gc_init(environment *env)
203        env->gc_ref= titem;        env->gc_ref= titem;
204        continue;        continue;
205      }      }
206    
207  #ifdef DEBUG  #ifdef DEBUG
208      printf("Kept value (%p)", env->gc_ref->item);      printf("Kept value (%p)", env->gc_ref->item);
209      if(env->gc_ref->item->gc.flag.mark)      if(env->gc_ref->item->gc.flag.mark)
# Line 227  extern void gc_init(environment *env) Line 215  extern void gc_init(environment *env)
215        printf(" integer: %d", env->gc_ref->item->content.i);        printf(" integer: %d", env->gc_ref->item->content.i);
216        break;        break;
217      case func:      case func:
218        printf(" func: %p", env->gc_ref->item->content.ptr);        printf(" func: %p", env->gc_ref->item->content.func);
219        break;        break;
220      case symb:      case symb:
221        printf(" symb: %s", env->gc_ref->item->content.sym->id);        printf(" symb: %s", env->gc_ref->item->content.sym->id);
222        break;        break;
223      case tcons:      case tcons:
224        printf(" tcons: %p\t%p", env->gc_ref->item->content.c->car,        printf(" tcons: %p\t%p", CAR(env->gc_ref->item),
225               env->gc_ref->item->content.c->cdr);               CDR(env->gc_ref->item));
226        break;        break;
227      default:      default:
228        printf(" <unknown %d>", (env->gc_ref->item->type));        printf(" <unknown %d>", (env->gc_ref->item->type));
# Line 245  extern void gc_init(environment *env) Line 233  extern void gc_init(environment *env)
233      /* Keep values */          /* Keep values */    
234      env->gc_count += sizeof(value);      env->gc_count += sizeof(value);
235      if(env->gc_ref->item->type==string)      if(env->gc_ref->item->type==string)
236        env->gc_count += strlen(env->gc_ref->item->content.ptr)+1;        env->gc_count += strlen(env->gc_ref->item->content.string)+1;
237            
238      titem= env->gc_ref->next;      titem= env->gc_ref->next;
239      env->gc_ref->next= new_head;      env->gc_ref->next= new_head;
# Line 264  extern void gc_init(environment *env) Line 252  extern void gc_init(environment *env)
252    
253  }  }
254    
255    
256    inline void gc_maybe(environment *env)
257    {
258      if(env->gc_count < env->gc_limit)
259        return;
260      else
261        return gc_init(env);
262    }
263    
264    
265  /* Protect values from GC */  /* Protect values from GC */
266  void protect(value *val)  void protect(value *val)
267  {  {
# Line 278  void protect(value *val) Line 276  void protect(value *val)
276    }    }
277  }  }
278    
279    
280  /* Unprotect values from GC */  /* Unprotect values from GC */
281  void unprotect(value *val)  void unprotect(value *val)
282  {  {
# Line 292  void unprotect(value *val) Line 291  void unprotect(value *val)
291    }    }
292  }  }
293    
294    
295  /* Push a value onto the stack */  /* Push a value onto the stack */
296  void push_val(environment *env, value *val)  void push_val(environment *env, value *val)
297  {  {
# Line 306  void push_val(environment *env, value *v Line 306  void push_val(environment *env, value *v
306    env->head= new_value;    env->head= new_value;
307  }  }
308    
309    
310  /* Push an integer onto the stack */  /* Push an integer onto the stack */
311  void push_int(environment *env, int in_val)  void push_int(environment *env, int in_val)
312  {  {
# Line 317  void push_int(environment *env, int in_v Line 318  void push_int(environment *env, int in_v
318    push_val(env, new_value);    push_val(env, new_value);
319  }  }
320    
321    
322  /* Push a floating point number onto the stack */  /* Push a floating point number onto the stack */
323  void push_float(environment *env, float in_val)  void push_float(environment *env, float in_val)
324  {  {
# Line 328  void push_float(environment *env, float Line 330  void push_float(environment *env, float
330    push_val(env, new_value);    push_val(env, new_value);
331  }  }
332    
333    
334  /* Copy a string onto the stack. */  /* Copy a string onto the stack. */
335  void push_cstring(environment *env, const char *in_string)  void push_cstring(environment *env, const char *in_string)
336  {  {
337    value *new_value= new_val(env);    value *new_value= new_val(env);
338    int length= strlen(in_string)+1;    int length= strlen(in_string)+1;
339    
340    new_value->content.ptr= malloc(length);    new_value->content.string= malloc(length);
341      assert(new_value != NULL);
342    env->gc_count += length;    env->gc_count += length;
343    strcpy(new_value->content.ptr, in_string);    strcpy(new_value->content.string, in_string);
344    new_value->type= string;    new_value->type= string;
345    
346    push_val(env, new_value);    push_val(env, new_value);
347  }  }
348    
349    
350  /* Mangle a symbol name to a valid C identifier name */  /* Mangle a symbol name to a valid C identifier name */
351  char *mangle_str(const char *old_string)  char *mangle_str(const char *old_string)
352  {  {
# Line 349  char *mangle_str(const char *old_string) Line 354  char *mangle_str(const char *old_string)
354    char *new_string, *current;    char *new_string, *current;
355    
356    new_string= malloc((strlen(old_string)*2)+4);    new_string= malloc((strlen(old_string)*2)+4);
357      assert(new_string != NULL);
358    strcpy(new_string, "sx_");    /* Stack eXternal */    strcpy(new_string, "sx_");    /* Stack eXternal */
359    current= new_string+3;    current= new_string+3;
360    
361    while(old_string[0] != '\0'){    while(old_string[0] != '\0'){
362      current[0]= validchars[(unsigned char)(old_string[0])/16];      current[0]= validchars[(unsigned char)(old_string[0])/16];
363      current[1]= validchars[(unsigned char)(old_string[0])%16];      current[1]= validchars[(unsigned char)(old_string[0])%16];
# Line 362  char *mangle_str(const char *old_string) Line 369  char *mangle_str(const char *old_string)
369    return new_string;            /* The caller must free() it */    return new_string;            /* The caller must free() it */
370  }  }
371    
 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((const char *)(CAR(env->head)->content.ptr));  
   
   toss(env);  
   if(env->err) return;  
   
   push_cstring(env, new_string);  
 }  
372    
373  /* Push a symbol onto the stack. */  /* Push a symbol onto the stack. */
374  void push_sym(environment *env, const char *in_string)  void push_sym(environment *env, const char *in_string)
# Line 403  void push_sym(environment *env, const ch Line 386  void push_sym(environment *env, const ch
386    char *mangled;                /* Mangled function name */    char *mangled;                /* Mangled function name */
387    
388    new_value= new_val(env);    new_value= new_val(env);
   protect(new_value);  
389    new_fvalue= new_val(env);    new_fvalue= new_val(env);
   protect(new_fvalue);  
390    
391    /* The new value is a symbol */    /* The new value is a symbol */
392    new_value->type= symb;    new_value->type= symb;
393    
394    /* Look up the symbol name in the hash table */    /* Look up the symbol name in the hash table */
395    new_symbol= hash(env->symbols, in_string);    new_symbol= hash(env->symbols, in_string);
396    new_value->content.ptr= *new_symbol;    new_value->content.sym= *new_symbol;
397    
398    if(*new_symbol==NULL) { /* If symbol was undefined */    if(*new_symbol==NULL) { /* If symbol was undefined */
399    
400      /* Create a new symbol */      /* Create a new symbol */
401      (*new_symbol)= malloc(sizeof(symbol));      (*new_symbol)= malloc(sizeof(symbol));
402        assert((*new_symbol) != NULL);
403      (*new_symbol)->val= NULL;   /* undefined value */      (*new_symbol)->val= NULL;   /* undefined value */
404      (*new_symbol)->next= NULL;      (*new_symbol)->next= NULL;
405      (*new_symbol)->id= malloc(strlen(in_string)+1);      (*new_symbol)->id= malloc(strlen(in_string)+1);
406        assert((*new_symbol)->id != NULL);
407      strcpy((*new_symbol)->id, in_string);      strcpy((*new_symbol)->id, in_string);
408    
409      /* Intern the new symbol in the hash table */      /* Intern the new symbol in the hash table */
410      new_value->content.ptr= *new_symbol;      new_value->content.sym= *new_symbol;
411    
412      /* Try to load the symbol name as an external function, to see if      /* Try to load the symbol name as an external function, to see if
413         we should bind the symbol to a new function pointer value */         we should bind the symbol to a new function pointer value */
# Line 442  void push_sym(environment *env, const ch Line 425  void push_sym(environment *env, const ch
425    
426      if(dlerr==NULL) {           /* If a function was found */      if(dlerr==NULL) {           /* If a function was found */
427        new_fvalue->type= func;   /* The new value is a function pointer */        new_fvalue->type= func;   /* The new value is a function pointer */
428        new_fvalue->content.ptr= funcptr; /* Store function pointer */        new_fvalue->content.func= funcptr; /* Store function pointer */
429        (*new_symbol)->val= new_fvalue; /* Bind the symbol to the new        (*new_symbol)->val= new_fvalue; /* Bind the symbol to the new
430                                           function value */                                           function value */
431      }      }
# Line 451  void push_sym(environment *env, const ch Line 434  void push_sym(environment *env, const ch
434    }    }
435    
436    push_val(env, new_value);    push_val(env, new_value);
   unprotect(new_value); unprotect(new_fvalue);  
 }  
   
 /* Print newline. */  
 extern void nl()  
 {  
   printf("\n");  
437  }  }
438    
 /* Gets the type of a value */  
 extern void type(environment *env)  
 {  
   if(env->head->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   switch(CAR(env->head)->type){  
   case empty:  
     push_sym(env, "empty");  
     break;  
   case integer:  
     push_sym(env, "integer");  
     break;  
   case tfloat:  
     push_sym(env, "float");  
     break;  
   case string:  
     push_sym(env, "string");  
     break;  
   case symb:  
     push_sym(env, "symbol");  
     break;  
   case func:  
     push_sym(env, "function");  
     break;  
   case tcons:  
     push_sym(env, "pair");  
     break;  
   }  
   swap(env);  
   if (env->err) return;  
   toss(env);  
 }      
439    
440  /* Print a value */  /* Print a value */
441  void print_val(value *val, int noquote, stackitem *stack)  void print_val(environment *env, value *val, int noquote, stackitem *stack,
442                   FILE *stream)
443  {  {
444    stackitem *titem, *tstack;    stackitem *titem, *tstack;
445    int depth;    int depth;
446    
447    switch(val->type) {    switch(val->type) {
448    case empty:    case empty:
449      printf("[]");      if(fprintf(stream, "[]") < 0)
450          env->err= 5;
451        break;
452      case unknown:
453        if(fprintf(stream, "UNKNOWN") < 0)
454          env->err= 5;
455      break;      break;
456    case integer:    case integer:
457      printf("%d", val->content.i);      if(fprintf(stream, "%d", val->content.i) < 0)
458          env->err= 5;
459      break;      break;
460    case tfloat:    case tfloat:
461      printf("%f", val->content.f);      if(fprintf(stream, "%f", val->content.f) < 0)
462          env->err= 5;
463      break;      break;
464    case string:    case string:
465      if(noquote)      if(noquote){
466        printf("%s", (char*)(val->content.ptr));        if(fprintf(stream, "%s", val->content.string) < 0)
467      else          env->err= 5;
468        printf("\"%s\"", (char*)(val->content.ptr));      } else {                    /* quote */
469          if(fprintf(stream, "\"%s\"", val->content.string) < 0)
470            env->err= 5;
471        }
472      break;      break;
473    case symb:    case symb:
474      printf("%s", val->content.sym->id);      if(fprintf(stream, "%s", val->content.sym->id) < 0)
475          env->err= 5;
476      break;      break;
477    case func:    case func:
478      printf("#<function %p>", (funcp)(val->content.ptr));      if(fprintf(stream, "#<function %p>", val->content.func) < 0)
479          env->err= 5;
480        break;
481      case port:
482        if(fprintf(stream, "#<port %p>", val->content.p) < 0)
483          env->err= 5;
484      break;      break;
485    case tcons:    case tcons:
486      printf("[ ");      if(fprintf(stream, "[ ") < 0) {
487          env->err= 5;
488          return printerr(env);
489        }
490      tstack= stack;      tstack= stack;
491    
492      do {      do {
493        titem=malloc(sizeof(stackitem));        titem=malloc(sizeof(stackitem));
494          assert(titem != NULL);
495        titem->item=val;        titem->item=val;
496        titem->next=tstack;        titem->next=tstack;
497        tstack=titem;             /* Put it on the stack */        tstack=titem;             /* Put it on the stack */
# Line 537  void print_val(value *val, int noquote, Line 499  void print_val(value *val, int noquote,
499           printing this value */           printing this value */
500        titem=tstack;        titem=tstack;
501        depth=0;        depth=0;
502    
503        while(titem != NULL && titem->item != CAR(val)){        while(titem != NULL && titem->item != CAR(val)){
504          titem=titem->next;          titem=titem->next;
505          depth++;          depth++;
506        }        }
507    
508        if(titem != NULL){        /* If we found it on the stack, */        if(titem != NULL){        /* If we found it on the stack, */
509          printf("#%d#", depth);  /* print a depth reference */          if(fprintf(stream, "#%d#", depth) < 0){ /* print a depth reference */
510              env->err= 5;
511              free(titem);
512              return printerr(env);
513            }
514        } else {        } else {
515          print_val(CAR(val), noquote, tstack);          print_val(env, CAR(val), noquote, tstack, stream);
516        }        }
517    
518        val= CDR(val);        val= CDR(val);
519        switch(val->type){        switch(val->type){
520        case empty:        case empty:
# Line 555  void print_val(value *val, int noquote, Line 524  void print_val(value *val, int noquote,
524             printing this value */             printing this value */
525          titem=tstack;          titem=tstack;
526          depth=0;          depth=0;
527    
528          while(titem != NULL && titem->item != val){          while(titem != NULL && titem->item != val){
529            titem=titem->next;            titem=titem->next;
530            depth++;            depth++;
531          }          }
532          if(titem != NULL){      /* If we found it on the stack, */          if(titem != NULL){      /* If we found it on the stack, */
533            printf(" . #%d#", depth); /* print a depth reference */            if(fprintf(stream, " . #%d#", depth) < 0){ /* print a depth reference */
534                env->err= 5;
535                printerr(env);
536                goto printval_end;
537              }
538          } else {          } else {
539            printf(" ");            if(fprintf(stream, " ") < 0){
540                env->err= 5;
541                printerr(env);
542                goto printval_end;
543              }
544          }          }
545          break;          break;
546        default:        default:
547          printf(" . ");          /* Improper list */          if(fprintf(stream, " . ") < 0){ /* Improper list */
548          print_val(val, noquote, tstack);            env->err= 5;
549              printerr(env);
550              goto printval_end;
551            }
552            print_val(env, val, noquote, tstack, stream);
553        }        }
554      } while(val->type == tcons && titem == NULL);      } while(val->type == tcons && titem == NULL);
555    
556      printval_end:
557    
558      titem=tstack;      titem=tstack;
559      while(titem != stack){      while(titem != stack){
560        tstack=titem->next;        tstack=titem->next;
561        free(titem);        free(titem);
562        titem=tstack;        titem=tstack;
563      }      }
     printf(" ]");  
     break;  
   }  
 }  
   
 extern void print_(environment *env)  
 {  
   if(env->head->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   print_val(CAR(env->head), 0, NULL);  
   nl();  
 }  
564    
565  /* Prints the top element of the stack and then discards it. */      if(! (env->err)){
566  extern void print(environment *env)        if(fprintf(stream, " ]") < 0){
567  {          env->err= 5;
568    print_(env);        }
569    if(env->err) return;      }
570    toss(env);      break;
 }  
   
 extern void princ_(environment *env)  
 {  
   if(env->head->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
571    }    }
572    print_val(CAR(env->head), 1, NULL);    
573  }    if(env->err)
574        return printerr(env);
 /* Prints the top element of the stack and then discards it. */  
 extern void princ(environment *env)  
 {  
   princ_(env);  
   if(env->err) return;  
   toss(env);  
 }  
   
 /* Only to be called by function printstack. */  
 void print_st(value *stack_head, long counter)  
 {  
   if(CDR(stack_head)->type != empty)  
     print_st(CDR(stack_head), counter+1);  
   printf("%ld: ", counter);  
   print_val(CAR(stack_head), 0, NULL);  
   nl();  
575  }  }
576    
 /* Prints the stack. */  
 extern void printstack(environment *env)  
 {  
   if(env->head->type == empty) {  
     printf("Stack Empty\n");  
     return;  
   }  
   
   print_st(env->head, 1);  
 }  
577    
578  /* Swap the two top elements on the stack. */  /* Swap the two top elements on the stack. */
579  extern void swap(environment *env)  extern void swap(environment *env)
580  {  {
581    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;  
   }  
582    
583      if(check_args(env, 2, unknown, unknown))
584        return printerr(env);
585      
586    env->head= CDR(env->head);    env->head= CDR(env->head);
587    CDR(temp)= CDR(env->head);    CDR(temp)= CDR(env->head);
588    CDR(env->head)= temp;    CDR(env->head)= temp;
589  }  }
590    
 /* Rotate the first three elements on the stack. */  
 extern void rot(environment *env)  
 {  
   value *temp= env->head;  
     
   if(env->head->type == empty || CDR(env->head)->type == empty  
      || CDR(CDR(env->head))->type == empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
     
   env->head= CDR(CDR(env->head));  
   CDR(CDR(temp))= CDR(env->head);  
   CDR(env->head)= temp;  
 }  
591    
592  /* Recall a value from a symbol, if bound */  /* Recall a value from a symbol, if bound */
593  extern void rcl(environment *env)  extern void rcl(environment *env)
594  {  {
595    value *val;    value *val;
596    
597    if(env->head->type==empty) {    if(check_args(env, 1, symb))
598      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;  
   }  
599    
600    val= CAR(env->head)->content.sym->val;    val= CAR(env->head)->content.sym->val;
601    if(val == NULL){    if(val == NULL){
     printerr("Unbound Variable");  
602      env->err= 3;      env->err= 3;
603      return;      return printerr(env);
604    }    }
605    
606    push_val(env, val);           /* Return the symbol's bound value */    push_val(env, val);           /* Return the symbol's bound value */
607    swap(env);    swap(env);
608    if(env->err) return;    if(env->err) return;
609    toss(env);                    /* toss the symbol */    env->head= CDR(env->head);
   if(env->err) return;  
610  }  }
611    
612    
613  /* If the top element is a symbol, determine if it's bound to a  /* If the top element is a symbol, determine if it's bound to a
614     function value, and if it is, toss the symbol and execute the     function value, and if it is, toss the symbol and execute the
615     function. */     function. */
# Line 715  extern void eval(environment *env) Line 623  extern void eval(environment *env)
623    
624    gc_maybe(env);    gc_maybe(env);
625    
626    if(env->head->type==empty) {    if(check_args(env, 1, unknown))
627      printerr("Too Few Arguments");      return printerr(env);
     env->err= 1;  
     return;  
   }  
628    
629    switch(CAR(env->head)->type) {    switch(CAR(env->head)->type) {
630      /* if it's a symbol */      /* if it's a symbol */
631    case symb:    case symb:
632        env->errsymb= CAR(env->head)->content.sym->id;
633      rcl(env);                   /* get its contents */      rcl(env);                   /* get its contents */
634      if(env->err) return;      if(env->err) return;
635      if(CAR(env->head)->type!=symb){ /* don't recurse symbols */      if(CAR(env->head)->type!=symb){ /* don't recurse symbols */
# Line 733  extern void eval(environment *env) Line 639  extern void eval(environment *env)
639    
640      /* If it's a lone function value, run it */      /* If it's a lone function value, run it */
641    case func:    case func:
642      in_func= (funcp)(CAR(env->head)->content.ptr);      in_func= CAR(env->head)->content.func;
643      toss(env);      env->head= CDR(env->head);
644      if(env->err) return;      return in_func((void*)env);
     return in_func(env);  
645    
646      /* If it's a list */      /* If it's a list */
647    case tcons:    case tcons:
648      temp_val= CAR(env->head);      temp_val= CAR(env->head);
649      protect(temp_val);      protect(temp_val);
650    
651      toss(env); if(env->err) return;      env->head= CDR(env->head);
652      iterator= temp_val;      iterator= temp_val;
653            
654      while(iterator->type != empty) {      while(iterator->type != empty) {
655        push_val(env, CAR(iterator));        push_val(env, CAR(iterator));
656                
657        if(CAR(env->head)->type==symb       if(CAR(env->head)->type==symb
658           && CAR(env->head)->content.sym->id[0]==';') {           && CAR(env->head)->content.sym->id[0]==';') {
659          toss(env);          env->head= CDR(env->head);
         if(env->err) return;  
660                    
661          if(CDR(iterator)->type == empty){          if(CDR(iterator)->type == empty){
662            goto eval_start;            goto eval_start;
# Line 763  extern void eval(environment *env) Line 667  extern void eval(environment *env)
667        if (CDR(iterator)->type == empty || CDR(iterator)->type == tcons)        if (CDR(iterator)->type == empty || CDR(iterator)->type == tcons)
668          iterator= CDR(iterator);          iterator= CDR(iterator);
669        else {        else {
670          printerr("Bad Argument Type"); /* Improper list */          env->err= 2; /* Improper list */
671          env->err= 2;          return printerr(env);
         return;  
672        }        }
673      }      }
674      unprotect(temp_val);      unprotect(temp_val);
675      return;      return;
676    
677    case empty:    case empty:
678        env->head= CDR(env->head);
679    case integer:    case integer:
680    case tfloat:    case tfloat:
681    case string:    case string:
682      case port:
683      case unknown:
684      return;      return;
685    }    }
686  }  }
687    
 /* Reverse (flip) a list */  
 extern void rev(environment *env)  
 {  
   value *old_head, *new_head, *item;  
   
   if(env->head->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   if(CAR(env->head)->type==empty)  
     return;                     /* Don't reverse an empty list */  
   
   if(CAR(env->head)->type!=tcons) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
   
   old_head= CAR(env->head);  
   new_head= new_val(env);  
   while(old_head->type != empty) {  
     item= old_head;  
     old_head= CDR(old_head);  
     CDR(item)= new_head;  
     new_head= item;  
   }  
   CAR(env->head)= new_head;  
 }  
   
 /* Make a list. */  
 extern void pack(environment *env)  
 {  
   value *iterator, *temp, *ending;  
   
   ending=new_val(env);  
   
   iterator= env->head;  
   if(iterator->type == empty  
      || (CAR(iterator)->type==symb  
      && CAR(iterator)->content.sym->id[0]=='[')) {  
     temp= ending;  
     toss(env);  
   } else {  
     /* Search for first delimiter */  
     while(CDR(iterator)->type != empty  
           && (CAR(CDR(iterator))->type!=symb  
            || CAR(CDR(iterator))->content.sym->id[0]!='['))  
       iterator= CDR(iterator);  
       
     /* Extract list */  
     temp= env->head;  
     env->head= CDR(iterator);  
     CDR(iterator)= ending;  
   
     if(env->head->type != empty)  
       toss(env);  
   }  
   
   /* Push list */  
   
   push_val(env, temp);  
   rev(env);  
 }  
   
 /* Relocate elements of the list on the stack. */  
 extern void expand(environment *env)  
 {  
   value *temp, *new_head;  
   
   /* Is top element a list? */  
   if(env->head->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   if(CAR(env->head)->type!=tcons) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
   
   rev(env);  
   
   if(env->err)  
     return;  
   
   /* The first list element is the new stack head */  
   new_head= temp= CAR(env->head);  
   
   toss(env);  
   
   /* Find the end of the list */  
   while(CDR(temp)->type != empty) {  
     if (CDR(temp)->type == tcons)  
       temp= CDR(temp);  
     else {  
       printerr("Bad Argument Type"); /* Improper list */  
       env->err= 2;  
       return;  
     }  
   }  
   
   /* Connect the tail of the list with the old stack head */  
   CDR(temp)= env->head;  
   env->head= new_head;          /* ...and voila! */  
   
 }  
   
 /* Compares two elements by reference. */  
 extern void eq(environment *env)  
 {  
   void *left, *right;  
   
   if(env->head->type==empty || CDR(env->head)->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   left= CAR(env->head)->content.ptr;  
   right= CAR(CDR(env->head))->content.ptr;  
   toss(env); toss(env);  
   
   push_int(env, left==right);  
 }  
   
 /* Negates the top element on the stack. */  
 extern void not(environment *env)  
 {  
   int val;  
   
   if(env->head->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   if(CAR(env->head)->type!=integer) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
   
   val= CAR(env->head)->content.i;  
   toss(env);  
   push_int(env, !val);  
 }  
   
 /* Compares the two top elements on the stack and return 0 if they're the  
    same. */  
 extern void neq(environment *env)  
 {  
   eq(env);  
   not(env);  
 }  
   
 /* Give a symbol some content. */  
 extern void def(environment *env)  
 {  
   symbol *sym;  
   
   /* Needs two values on the stack, the top one must be a symbol */  
   if(env->head->type==empty || CDR(env->head)->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   if(CAR(env->head)->type!=symb) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
   
   /* long names are a pain */  
   sym= CAR(env->head)->content.ptr;  
   
   /* Bind the symbol to the value */  
   sym->val= CAR(CDR(env->head));  
   
   toss(env); toss(env);  
 }  
   
 /* Quit stack. */  
 extern void quit(environment *env)  
 {  
   int i;  
   
   clear(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);  
 }  
   
 /* Clear stack */  
 extern void clear(environment *env)  
 {  
   while(env->head->type != empty)  
     toss(env);  
 }  
   
 /* 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\n", temp->id);  
       temp= temp->next;  
     }  
   }  
 }  
688    
689  /* Internal forget function */  /* Internal forget function */
690  void forget_sym(symbol **hash_entry)  void forget_sym(symbol **hash_entry)
# Line 1033  void forget_sym(symbol **hash_entry) Line 698  void forget_sym(symbol **hash_entry)
698    free(temp);    free(temp);
699  }  }
700    
 /* Forgets a symbol (remove it from the hash table) */  
 extern void forget(environment *env)  
 {  
   char* sym_id;  
   
   if(env->head->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
     
   if(CAR(env->head)->type!=symb) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
   
   sym_id= CAR(env->head)->content.sym->id;  
   toss(env);  
   
   return forget_sym(hash(env->symbols, sym_id));  
 }  
   
 /* Returns the current error number to the stack */  
 extern void errn(environment *env)  
 {  
   push_int(env, env->err);  
 }  
701    
702  int main(int argc, char **argv)  int main(int argc, char **argv)
703  {  {
704    environment myenv;    environment myenv;
   
705    int c;                        /* getopt option character */    int c;                        /* getopt option character */
706    
707  #ifdef __linux__  #ifdef __linux__
# Line 1100  int main(int argc, char **argv) Line 736  int main(int argc, char **argv)
736      }      }
737    }    }
738    
739    if(myenv.interactive) {    if(myenv.interactive)
740      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");  
   }  
741    
742    while(1) {    while(1) {
743      if(myenv.in_string==NULL) {      if(myenv.in_string==NULL) {
744        if (myenv.interactive) {        if (myenv.interactive) {
745          if(myenv.err) {          if(myenv.err) {
746            printf("(error %d)\n", myenv.err);            printf("(error %d)\n", myenv.err);
747              myenv.err= 0;
748          }          }
749          nl();          printf("\n");
750          printstack(&myenv);          printstack(&myenv);
751          printf("> ");          printf("> ");
752        }        }
753        myenv.err=0;        myenv.err=0;
754      }      }
755      sx_72656164(&myenv);        /* "read" */      readstream(&myenv, myenv.inputstream);
756      if (myenv.err==4) {         /* EOF */      if (myenv.err) {            /* EOF or other error */
757        myenv.err=0;        myenv.err=0;
758        quit(&myenv);        quit(&myenv);
759      } else if(myenv.head->type!=empty      } else if(myenv.head->type!=empty
760                && CAR(myenv.head)->type==symb                && CAR(myenv.head)->type==symb
761                && CAR(myenv.head)->content.sym->id[0]                && CAR(myenv.head)->content.sym->id[0] == ';') {
762                ==';') {        if(myenv.head->type != empty)
763        toss(&myenv);             /* No error check in main */          myenv.head= CDR(myenv.head);
764        eval(&myenv);        eval(&myenv);
765        } else {
766          gc_maybe(&myenv);
767      }      }
     gc_maybe(&myenv);  
768    }    }
769    quit(&myenv);    quit(&myenv);
770    return EXIT_FAILURE;    return EXIT_FAILURE;
771  }  }
772    
 /* "+" */  
 extern void sx_2b(environment *env)  
 {  
   int a, b;  
   float fa, fb;  
   size_t len;  
   char* new_string;  
   value *a_val, *b_val;  
   
   if(env->head->type==empty || CDR(env->head)->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   if(CAR(env->head)->type==string  
      && CAR(CDR(env->head))->type==string) {  
     a_val= CAR(env->head);  
     b_val= CAR(CDR(env->head));  
     protect(a_val); protect(b_val);  
     toss(env); if(env->err) return;  
     toss(env); if(env->err) return;  
     len= strlen(a_val->content.ptr)+strlen(b_val->content.ptr)+1;  
     new_string= malloc(len);  
     strcpy(new_string, b_val->content.ptr);  
     strcat(new_string, a_val->content.ptr);  
     push_cstring(env, new_string);  
     unprotect(a_val); unprotect(b_val);  
     free(new_string);  
       
     return;  
   }  
     
   if(CAR(env->head)->type==integer  
      && CAR(CDR(env->head))->type==integer) {  
     a= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     b= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     push_int(env, b+a);  
   
     return;  
   }  
   
   if(CAR(env->head)->type==tfloat  
      && CAR(CDR(env->head))->type==tfloat) {  
     fa= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     fb= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     push_float(env, fb+fa);  
       
     return;  
   }  
   
   if(CAR(env->head)->type==tfloat  
      && CAR(CDR(env->head))->type==integer) {  
     fa= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     b= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     push_float(env, b+fa);  
       
     return;  
   }  
   
   if(CAR(env->head)->type==integer  
      && CAR(CDR(env->head))->type==tfloat) {  
     a= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     fb= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     push_float(env, fb+a);  
   
     return;  
   }  
   
   printerr("Bad Argument Type");  
   env->err=2;  
 }  
   
 /* "-" */  
 extern void sx_2d(environment *env)  
 {  
   int a, b;  
   float fa, fb;  
   
   if(env->head->type==empty || CDR(env->head)->type==empty) {  
     printerr("Too Few Arguments");  
     env->err=1;  
     return;  
   }  
     
   if(CAR(env->head)->type==integer  
      && CAR(CDR(env->head))->type==integer) {  
     a= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     b= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     push_int(env, b-a);  
   
     return;  
   }  
   
   if(CAR(env->head)->type==tfloat  
      && CAR(CDR(env->head))->type==tfloat) {  
     fa= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     fb= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     push_float(env, fb-fa);  
       
     return;  
   }  
   
   if(CAR(env->head)->type==tfloat  
      && CAR(CDR(env->head))->type==integer) {  
     fa= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     b= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     push_float(env, b-fa);  
       
     return;  
   }  
   
   if(CAR(env->head)->type==integer  
      && CAR(CDR(env->head))->type==tfloat) {  
     a= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     fb= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     push_float(env, fb-a);  
   
     return;  
   }  
   
   printerr("Bad Argument Type");  
   env->err=2;  
 }  
   
 /* ">" */  
 extern void sx_3e(environment *env)  
 {  
   int a, b;  
   float fa, fb;  
   
   if(env->head->type==empty || CDR(env->head)->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
     
   if(CAR(env->head)->type==integer  
      && CAR(CDR(env->head))->type==integer) {  
     a= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     b= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     push_int(env, b>a);  
   
     return;  
   }  
   
   if(CAR(env->head)->type==tfloat  
      && CAR(CDR(env->head))->type==tfloat) {  
     fa= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     fb= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     push_int(env, fb>fa);  
       
     return;  
   }  
   
   if(CAR(env->head)->type==tfloat  
      && CAR(CDR(env->head))->type==integer) {  
     fa= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     b= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     push_int(env, b>fa);  
       
     return;  
   }  
   
   if(CAR(env->head)->type==integer  
      && CAR(CDR(env->head))->type==tfloat) {  
     a= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     fb= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     push_int(env, fb>a);  
   
     return;  
   }  
   
   printerr("Bad Argument Type");  
   env->err= 2;  
 }  
   
 /* "<" */  
 extern void sx_3c(environment *env)  
 {  
   swap(env); if(env->err) return;  
   sx_3e(env);  
 }  
   
 /* "<=" */  
 extern void sx_3c3d(environment *env)  
 {  
   sx_3e(env); if(env->err) return;  
   not(env);  
 }  
   
 /* ">=" */  
 extern void sx_3e3d(environment *env)  
 {  
   sx_3c(env); if(env->err) return;  
   not(env);  
 }  
773    
774  /* Return copy of a value */  /* Return copy of a value */
775  value *copy_val(environment *env, value *old_value)  value *copy_val(environment *env, value *old_value)
# Line 1367  value *copy_val(environment *env, value Line 779  value *copy_val(environment *env, value
779    if(old_value==NULL)    if(old_value==NULL)
780      return NULL;      return NULL;
781    
   protect(old_value);  
782    new_value= new_val(env);    new_value= new_val(env);
783    new_value->type= old_value->type;    new_value->type= old_value->type;
784    
# Line 1377  value *copy_val(environment *env, value Line 788  value *copy_val(environment *env, value
788    case func:    case func:
789    case symb:    case symb:
790    case empty:    case empty:
791      case unknown:
792      case port:
793      new_value->content= old_value->content;      new_value->content= old_value->content;
794      break;      break;
795    case string:    case string:
796      (char *)(new_value->content.ptr)=      new_value->content.string= strdup(old_value->content.string);
       strdup((char *)(old_value->content.ptr));  
797      break;      break;
798    case tcons:    case tcons:
799    
# Line 1394  value *copy_val(environment *env, value Line 806  value *copy_val(environment *env, value
806      break;      break;
807    }    }
808    
   unprotect(old_value);  
   
809    return new_value;    return new_value;
810  }  }
811    
 /* "dup"; duplicates an item on the stack */  
 extern void sx_647570(environment *env)  
 {  
   if(env->head->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   push_val(env, copy_val(env, CAR(env->head)));  
 }  
   
 /* "if", If-Then */  
 extern void sx_6966(environment *env)  
 {  
   int truth;  
   
   if(env->head->type==empty || CDR(env->head)->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   if(CAR(CDR(env->head))->type != integer) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
     
   swap(env);  
   if(env->err) return;  
     
   truth= CAR(env->head)->content.i;  
   
   toss(env);  
   if(env->err) return;  
   
   if(truth)  
     eval(env);  
   else  
     toss(env);  
 }  
   
 /* If-Then-Else */  
 extern void ifelse(environment *env)  
 {  
   int truth;  
   
   if(env->head->type==empty || CDR(env->head)->type==empty  
      || CDR(CDR(env->head))->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   if(CAR(CDR(CDR(env->head)))->type!=integer) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
     
   rot(env);  
   if(env->err) return;  
     
   truth= CAR(env->head)->content.i;  
   
   toss(env);  
   if(env->err) return;  
   
   if(!truth)  
     swap(env);  
   if(env->err) return;  
   
   toss(env);  
   if(env->err) return;  
   
   eval(env);  
 }  
   
 extern void sx_656c7365(environment *env)  
 {  
   if(env->head->type==empty || CDR(env->head)->type==empty  
      || CDR(CDR(env->head))->type==empty || CDR(CDR(CDR(env->head)))->type==empty  
      || CDR(CDR(CDR(CDR(env->head))))->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   if(CAR(CDR(env->head))->type!=symb  
      || strcmp(CAR(CDR(env->head))->content.sym->id, "then")!=0  
      || CAR(CDR(CDR(CDR(env->head))))->type!=symb  
      || strcmp(CAR(CDR(CDR(CDR(env->head))))->content.sym->id, "if")!=0) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
   
   swap(env); toss(env); rot(env); toss(env);  
   ifelse(env);  
 }  
   
 extern void then(environment *env)  
 {  
   if(env->head->type==empty || CDR(env->head)->type==empty  
      || CDR(CDR(env->head))->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   if(CAR(CDR(env->head))->type!=symb  
      || strcmp(CAR(CDR(env->head))->content.sym->id, "if")!=0) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
812    
813    swap(env); toss(env);  /* read a line from a stream; used by readline */
814    sx_6966(env);  void readlinestream(environment *env, FILE *stream)
 }  
   
 /* "while" */  
 extern void sx_7768696c65(environment *env)  
815  {  {
816    int truth;    char in_string[101];
   value *loop, *test;  
   
   if(env->head->type==empty || CDR(env->head)->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
817    
818    loop= CAR(env->head);    if(fgets(in_string, 100, stream)==NULL) {
819    protect(loop);      push_cstring(env, "");
820    toss(env); if(env->err) return;      if (! feof(stream)){
821          env->err= 5;
822    test= CAR(env->head);        return printerr(env);
   protect(test);  
   toss(env); if(env->err) return;  
   
   do {  
     push_val(env, test);  
     eval(env);  
       
     if(CAR(env->head)->type != integer) {  
       printerr("Bad Argument Type");  
       env->err= 2;  
       return;  
     }  
       
     truth= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
       
     if(truth) {  
       push_val(env, loop);  
       eval(env);  
     } else {  
       toss(env);  
823      }      }
824        } else {
825    } while(truth);      push_cstring(env, in_string);
826      }
   unprotect(loop); unprotect(test);  
827  }  }
828    
829    
830  /* "for"; for-loop */  /* Reverse (flip) a list */
831  extern void sx_666f72(environment *env)  extern void rev(environment *env)
832  {  {
833    value *loop;    value *old_head, *new_head, *item;
   int foo1, foo2;  
834    
835    if(env->head->type==empty || CDR(env->head)->type==empty    if(CAR(env->head)->type==empty)
836       || CDR(CDR(env->head))->type==empty) {      return;                     /* Don't reverse an empty list */
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
837    
838    if(CAR(CDR(env->head))->type!=integer    if(check_args(env, 1, tcons))
839       || CAR(CDR(CDR(env->head)))->type!=integer) {      return printerr(env);
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
840    
841    loop= CAR(env->head);    old_head= CAR(env->head);
842    protect(loop);    new_head= new_val(env);
843    toss(env); if(env->err) return;    while(old_head->type != empty) {
844        item= old_head;
845    foo2= CAR(env->head)->content.i;      old_head= CDR(old_head);
846    toss(env); if(env->err) return;      CDR(item)= new_head;
847        new_head= item;
   foo1= CAR(env->head)->content.i;  
   toss(env); if(env->err) return;  
   
   if(foo1<=foo2) {  
     while(foo1<=foo2) {  
       push_int(env, foo1);  
       push_val(env, loop);  
       eval(env); if(env->err) return;  
       foo1++;  
     }  
   } else {  
     while(foo1>=foo2) {  
       push_int(env, foo1);  
       push_val(env, loop);  
       eval(env); if(env->err) return;  
       foo1--;  
     }  
848    }    }
849    unprotect(loop);    CAR(env->head)= new_head;
850  }  }
851    
 /* Variant of for-loop */  
 extern void foreach(environment *env)  
 {    
   value *loop, *foo;  
   value *iterator;  
     
   if(env->head->type==empty || CDR(env->head)->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
852    
853    if(CAR(CDR(env->head))->type!=tcons) {  /* Make a list. */
854      printerr("Bad Argument Type");  extern void pack(environment *env)
     env->err= 2;  
     return;  
   }  
   
   loop= CAR(env->head);  
   protect(loop);  
   toss(env); if(env->err) return;  
   
   foo= CAR(env->head);  
   protect(foo);  
   toss(env); if(env->err) return;  
   
   iterator= foo;  
   
   while(iterator!=NULL) {  
     push_val(env, CAR(iterator));  
     push_val(env, loop);  
     eval(env); if(env->err) return;  
     if (iterator->type == tcons){  
       iterator= CDR(iterator);  
     } else {  
       printerr("Bad Argument Type"); /* Improper list */  
       env->err= 2;  
       break;  
     }  
   }  
   unprotect(loop); unprotect(foo);  
 }  
   
 /* "to" */  
 extern void to(environment *env)  
855  {  {
856    int ending, start, i;    value *iterator, *temp, *ending;
   value *iterator, *temp;  
   
   if(env->head->type==empty || CDR(env->head)->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   if(CAR(env->head)->type!=integer  
      || CAR(CDR(env->head))->type!=integer) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
857    
858    ending= CAR(env->head)->content.i;    ending=new_val(env);
   toss(env); if(env->err) return;  
   start= CAR(env->head)->content.i;  
   toss(env); if(env->err) return;  
   
   push_sym(env, "[");  
   
   if(ending>=start) {  
     for(i= ending; i>=start; i--)  
       push_int(env, i);  
   } else {  
     for(i= ending; i<=start; i++)  
       push_int(env, i);  
   }  
859    
860    iterator= env->head;    iterator= env->head;
861      if(iterator->type == empty
   if(iterator->type==empty  
862       || (CAR(iterator)->type==symb       || (CAR(iterator)->type==symb
863           && CAR(iterator)->content.sym->id[0]=='[')) {       && CAR(iterator)->content.sym->id[0]=='[')) {
864      temp= NULL;      temp= ending;
865      toss(env);      if(env->head->type != empty)
866          env->head= CDR(env->head);
867    } else {    } else {
868      /* Search for first delimiter */      /* Search for first delimiter */
869      while(CDR(iterator)!=NULL      while(CDR(iterator)->type != empty
870            && (CAR(CDR(iterator))->type!=symb            && (CAR(CDR(iterator))->type!=symb
871                || CAR(CDR(iterator))->content.sym->id[0]!='['))             || CAR(CDR(iterator))->content.sym->id[0]!='['))
872        iterator= CDR(iterator);        iterator= CDR(iterator);
873            
874      /* Extract list */      /* Extract list */
875      temp= env->head;      temp= env->head;
876      env->head= CDR(iterator);      env->head= CDR(iterator);
877      CDR(iterator)= NULL;      CDR(iterator)= ending;
878    
879      if(env->head!=NULL)      if(env->head->type != empty)
880        toss(env);        env->head= CDR(env->head);
881    }    }
882    
883    /* Push list */    /* Push list */
884    
885    push_val(env, temp);    push_val(env, temp);
886      rev(env);
887  }  }
888    
 /* Read a string */  
 extern void readline(environment *env)  
 {  
   char in_string[101];  
889    
890    if(fgets(in_string, 100, env->inputstream)==NULL)  /* read from a stream; used by "read" and "readport" */
891      push_cstring(env, "");  void readstream(environment *env, FILE *stream)
   else  
     push_cstring(env, in_string);  
 }  
   
 /* "read"; Read a value and place on stack */  
 extern void sx_72656164(environment *env)  
892  {  {
893    const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%n";    const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%n";
894    const char strform[]= "\"%[^\"]\"%n";    const char strform[]= "\"%[^\"]\"%n";
# Line 1752  extern void sx_72656164(environment *env Line 910  extern void sx_72656164(environment *env
910      if(depth > 0 && env->interactive) {      if(depth > 0 && env->interactive) {
911        printf("]> ");        printf("]> ");
912      }      }
913      readline(env); if(env->err) return;      readlinestream(env, env->inputstream);
914        if(env->err) return;
915    
916      if(((char *)(CAR(env->head)->content.ptr))[0]=='\0'){      if((CAR(env->head)->content.string)[0]=='\0'){
917        env->err= 4;              /* "" means EOF */        env->err= 4;              /* "" means EOF */
918        return;        return;
919      }      }
920            
921      env->in_string= malloc(strlen(CAR(env->head)->content.ptr)+1);      env->in_string= malloc(strlen(CAR(env->head)->content.string)+1);
922        assert(env->in_string != NULL);
923      env->free_string= env->in_string; /* Save the original pointer */      env->free_string= env->in_string; /* Save the original pointer */
924      strcpy(env->in_string, CAR(env->head)->content.ptr);      strcpy(env->in_string, CAR(env->head)->content.string);
925      toss(env); if(env->err) return;      env->head= CDR(env->head);
926    }    }
927        
928    inlength= strlen(env->in_string)+1;    inlength= strlen(env->in_string)+1;
929    match= malloc(inlength);    match= malloc(inlength);
930      assert(match != NULL);
931    
932    if(sscanf(env->in_string, blankform, &readlength) != EOF    if(sscanf(env->in_string, blankform, &readlength) != EOF
933       && readlength != -1) {       && readlength != -1) {
# Line 1810  extern void sx_72656164(environment *env Line 971  extern void sx_72656164(environment *env
971    free(match);    free(match);
972    
973    if(depth)    if(depth)
974      return sx_72656164(env);      return readstream(env, env->inputstream);
 }  
   
 #ifdef __linux__  
 extern void beep(environment *env)  
 {  
   int freq, dur, period, ticks;  
   
   if(env->head->type==empty || CDR(env->head)->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   if(CAR(env->head)->type!=integer  
      || CAR(CDR(env->head))->type!=integer) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
   
   dur= CAR(env->head)->content.i;  
   toss(env);  
   freq= CAR(env->head)->content.i;  
   toss(env);  
   
   period= 1193180/freq;         /* convert freq from Hz to period  
                                    length */  
   ticks= dur*.001193180;        /* convert duration from µseconds to  
                                    timer ticks */  
   
 /*    ticks=dur/1000; */  
   
       /*  if (ioctl(STDOUT_FILENO, KDMKTONE, (125<<16) + 0x637)==0) */  
   switch (ioctl(STDOUT_FILENO, KDMKTONE, (ticks<<16) | period)){  
   case 0:  
     usleep(dur);  
     return;  
   case -1:  
     perror("beep");  
     env->err= 5;  
     return;  
   default:  
     abort();  
   }  
 }  
 #endif /* __linux__ */  
   
 /* "wait" */  
 extern void sx_77616974(environment *env)  
 {  
   int dur;  
   
   if(env->head->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   if(CAR(env->head)->type!=integer) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
   
   dur= CAR(env->head)->content.i;  
   toss(env);  
   
   usleep(dur);  
 }  
   
 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");  
 }  
   
 /* "*" */  
 extern void sx_2a(environment *env)  
 {  
   int a, b;  
   float fa, fb;  
   
   if(env->head->type==empty || CDR(env->head)->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
     
   if(CAR(env->head)->type==integer  
      && CAR(CDR(env->head))->type==integer) {  
     a= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     b= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     push_int(env, b*a);  
   
     return;  
   }  
   
   if(CAR(env->head)->type==tfloat  
      && CAR(CDR(env->head))->type==tfloat) {  
     fa= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     fb= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     push_float(env, fb*fa);  
       
     return;  
   }  
   
   if(CAR(env->head)->type==tfloat  
      && CAR(CDR(env->head))->type==integer) {  
     fa= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     b= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     push_float(env, b*fa);  
       
     return;  
   }  
   
   if(CAR(env->head)->type==integer  
      && CAR(CDR(env->head))->type==tfloat) {  
     a= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     fb= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     push_float(env, fb*a);  
   
     return;  
   }  
   
   printerr("Bad Argument Type");  
   env->err= 2;  
 }  
   
 /* "/" */  
 extern void sx_2f(environment *env)  
 {  
   int a, b;  
   float fa, fb;  
   
   if(env->head->type==empty || CDR(env->head)->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
     
   if(CAR(env->head)->type==integer  
      && CAR(CDR(env->head))->type==integer) {  
     a= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     b= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     push_float(env, b/a);  
   
     return;  
   }  
   
   if(CAR(env->head)->type==tfloat  
      && CAR(CDR(env->head))->type==tfloat) {  
     fa= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     fb= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     push_float(env, fb/fa);  
       
     return;  
   }  
   
   if(CAR(env->head)->type==tfloat  
      && CAR(CDR(env->head))->type==integer) {  
     fa= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     b= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     push_float(env, b/fa);  
       
     return;  
   }  
   
   if(CAR(env->head)->type==integer  
      && CAR(CDR(env->head))->type==tfloat) {  
     a= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     fb= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     push_float(env, fb/a);  
   
     return;  
   }  
   
   printerr("Bad Argument Type");  
   env->err= 2;  
 }  
   
 /* "mod" */  
 extern void mod(environment *env)  
 {  
   int a, b;  
   
   if(env->head->type==empty || CDR(env->head)->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
     
   if(CAR(env->head)->type==integer  
      && CAR(CDR(env->head))->type==integer) {  
     a= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     b= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     push_int(env, b%a);  
   
     return;  
   }  
   
   printerr("Bad Argument Type");  
   env->err= 2;  
 }  
   
 /* "div" */  
 extern void sx_646976(environment *env)  
 {  
   int a, b;  
     
   if(env->head->type==empty || CDR(env->head)->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   if(CAR(env->head)->type==integer  
      && CAR(CDR(env->head))->type==integer) {  
     a= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     b= CAR(env->head)->content.i;  
     toss(env); if(env->err) return;  
     push_int(env, (int)b/a);  
   
     return;  
   }  
   
   printerr("Bad Argument Type");  
   env->err= 2;  
975  }  }
976    
 extern void setcar(environment *env)  
 {  
   if(env->head->type==empty || CDR(env->head)->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   if(CDR(env->head)->type!=tcons) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
977    
978    CAR(CAR(CDR(env->head)))=CAR(env->head);  int check_args(environment *env, int num_args, ...)
   toss(env);  
 }  
   
 extern void setcdr(environment *env)  
979  {  {
980    if(env->head->type==empty || CDR(env->head)->type==empty) {    va_list ap;
981      printerr("Too Few Arguments");    enum type_enum mytype;
982      env->err= 1;    int i;
     return;  
   }  
   
   if(CDR(env->head)->type!=tcons) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
   
   CDR(CAR(CDR(env->head)))=CAR(env->head);  
   toss(env);  
 }  
   
 extern void car(environment *env)  
 {  
   if(env->head->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   if(CAR(env->head)->type!=tcons) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
983    
984    CAR(env->head)=CAR(CAR(env->head));    value *iter= env->head;
985  }    int errval= 0;
986    
987  extern void cdr(environment *env)    va_start(ap, num_args);
988  {    for(i=1; i<=num_args; i++) {
989    if(env->head->type==empty) {      mytype= va_arg(ap, enum type_enum);
990      printerr("Too Few Arguments");      //    fprintf(stderr, "%s\n", env->errsymb);
     env->err= 1;  
     return;  
   }  
991    
992    if(CAR(env->head)->type!=tcons) {      if(iter->type==empty || iter==NULL) {
993      printerr("Bad Argument Type");        errval= 1;
994      env->err= 2;        break;
995      return;      }
   }  
   
   CAR(env->head)=CDR(CAR(env->head));  
 }  
996    
997  extern void cons(environment *env)      if(mytype!=unknown && CAR(iter)->type!=mytype) {
998  {        errval= 2;
999    value *val;        break;
1000        }
1001    
1002    if(env->head->type==empty || CDR(env->head)->type==empty) {      iter= CDR(iter);
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
1003    }    }
1004    
1005    val=new_val(env);    va_end(ap);
   val->content.c= malloc(sizeof(pair));  
   assert(val->content.c!=NULL);  
   
   env->gc_count += sizeof(pair);  
   val->type=tcons;  
   
   CAR(val)= CAR(CDR(env->head));  
   CDR(val)= CAR(env->head);  
   
   push_val(env, val);  
1006    
1007    swap(env); if(env->err) return;    env->err= errval;
1008    toss(env); if(env->err) return;    return errval;
   swap(env); if(env->err) return;  
   toss(env); if(env->err) return;  
1009  }  }
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