/[cvs]/stack/stack.c
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revision 1.121 by masse, Wed Mar 27 14:45:17 2002 UTC revision 1.135 by masse, Wed Aug 13 11:58:00 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)  
   
 /* printf, sscanf, fgets, fprintf, fopen, perror */  
 #include <stdio.h>  
 /* exit, EXIT_SUCCESS, malloc, free */  
 #include <stdlib.h>  
 /* NULL */  
 #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>  
25    
26  #ifdef __linux__  const char* start_message= "Stack version $Revision$\n\
27  /* mtrace, muntrace */  Copyright (C) 2002  Mats Alritzson and Teddy Hogeborn\n\
28  #include <mcheck.h>  Stack comes with ABSOLUTELY NO WARRANTY; for details type 'warranty;'.\n\
29  /* ioctl */  This is free software, and you are welcome to redistribute it\n\
30  #include <sys/ioctl.h>  under certain conditions; type 'copying;' for details.\n";
 /* KDMKTONE */  
 #include <linux/kd.h>  
 #endif /* __linux__ */  
31    
 #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      default:
70        in_string= "Unknown error";
71        break;
72    }    }
73      
74    env->head= CDR(env->head); /* Remove the top stack item */    fprintf(stderr, "\"%s\":\nErr: %s\n", env->errsymb, in_string);
75  }  }
76    
77    
78  /* Returns a pointer to a pointer to an element in the hash table. */  /* Returns a pointer to a pointer to an element in the hash table. */
79  symbol **hash(hashtbl in_hashtbl, const char *in_string)  symbol **hash(hashtbl in_hashtbl, const char *in_string)
80  {  {
# Line 117  symbol **hash(hashtbl in_hashtbl, const Line 104  symbol **hash(hashtbl in_hashtbl, const
104    }    }
105  }  }
106    
107    
108  /* Create new value */  /* Create new value */
109  value* new_val(environment *env)  value* new_val(environment *env)
110  {  {
# Line 141  value* new_val(environment *env) Line 129  value* new_val(environment *env)
129    return nval;    return nval;
130  }  }
131    
132    
133  /* Mark values recursively.  /* Mark values recursively.
134     Marked values are not collected by the GC. */     Marked values are not collected by the GC. */
135  inline void gc_mark(value *val)  inline void gc_mark(value *val)
# Line 156  inline void gc_mark(value *val) Line 145  inline void gc_mark(value *val)
145    }    }
146  }  }
147    
 inline void gc_maybe(environment *env)  
 {  
   if(env->gc_count < env->gc_limit)  
     return;  
   else  
     return gc_init(env);  
 }  
148    
149  /* Start GC */  /* Start GC */
150  extern void gc_init(environment *env)  extern void gc_init(environment *env)
# Line 180  extern void gc_init(environment *env) Line 162  extern void gc_init(environment *env)
162    if(env->interactive)    if(env->interactive)
163      printf(".");      printf(".");
164    
   
165    /* Mark values in hashtable */    /* Mark values in hashtable */
166    for(i= 0; i<HASHTBLSIZE; i++)    for(i= 0; i<HASHTBLSIZE; i++)
167      for(tsymb= env->symbols[i]; tsymb!=NULL; tsymb= tsymb->next)      for(tsymb= env->symbols[i]; tsymb!=NULL; tsymb= tsymb->next)
168        if (tsymb->val != NULL)        if (tsymb->val != NULL)
169          gc_mark(tsymb->val);          gc_mark(tsymb->val);
170    
   
171    if(env->interactive)    if(env->interactive)
172      printf(".");      printf(".");
173    
174    env->gc_count= 0;    env->gc_count= 0;
175    
176    while(env->gc_ref!=NULL) {    /* Sweep unused values */    while(env->gc_ref!=NULL) {    /* Sweep unused values */
   
177      if(!(env->gc_ref->item->gc.no_gc)){ /* neither mark nor protect */      if(!(env->gc_ref->item->gc.no_gc)){ /* neither mark nor protect */
178    
179        /* Remove content */        /* Remove content */
180        switch(env->gc_ref->item->type){        switch(env->gc_ref->item->type){
181        case string:        case string:
182          free(env->gc_ref->item->content.ptr);          free(env->gc_ref->item->content.string);
183          break;          break;
184        case tcons:        case tcons:
185          free(env->gc_ref->item->content.c);          free(env->gc_ref->item->content.c);
186          break;          break;
187          case port:
188        case empty:        case empty:
189          case unknown:
190        case integer:        case integer:
191        case tfloat:        case tfloat:
192        case func:        case func:
193        case symb:        case symb:
194          /* Symbol strings are freed when walking the hash table */          /* Symbol strings are freed when walking the hash table */
195            break;
196        }        }
197    
198        free(env->gc_ref->item);  /* Remove from gc_ref */        free(env->gc_ref->item);  /* Remove from gc_ref */
# Line 219  extern void gc_init(environment *env) Line 201  extern void gc_init(environment *env)
201        env->gc_ref= titem;        env->gc_ref= titem;
202        continue;        continue;
203      }      }
204    
205  #ifdef DEBUG  #ifdef DEBUG
206      printf("Kept value (%p)", env->gc_ref->item);      printf("Kept value (%p)", env->gc_ref->item);
207      if(env->gc_ref->item->gc.flag.mark)      if(env->gc_ref->item->gc.flag.mark)
# Line 230  extern void gc_init(environment *env) Line 213  extern void gc_init(environment *env)
213        printf(" integer: %d", env->gc_ref->item->content.i);        printf(" integer: %d", env->gc_ref->item->content.i);
214        break;        break;
215      case func:      case func:
216        printf(" func: %p", env->gc_ref->item->content.ptr);        printf(" func: %p", env->gc_ref->item->content.func);
217        break;        break;
218      case symb:      case symb:
219        printf(" symb: %s", env->gc_ref->item->content.sym->id);        printf(" symb: %s", env->gc_ref->item->content.sym->id);
220        break;        break;
221      case tcons:      case tcons:
222        printf(" tcons: %p\t%p", env->gc_ref->item->content.c->car,        printf(" tcons: %p\t%p", CAR(env->gc_ref->item),
223               env->gc_ref->item->content.c->cdr);               CDR(env->gc_ref->item));
224        break;        break;
225      default:      default:
226        printf(" <unknown %d>", (env->gc_ref->item->type));        printf(" <unknown %d>", (env->gc_ref->item->type));
# Line 248  extern void gc_init(environment *env) Line 231  extern void gc_init(environment *env)
231      /* Keep values */          /* Keep values */    
232      env->gc_count += sizeof(value);      env->gc_count += sizeof(value);
233      if(env->gc_ref->item->type==string)      if(env->gc_ref->item->type==string)
234        env->gc_count += strlen(env->gc_ref->item->content.ptr)+1;        env->gc_count += strlen(env->gc_ref->item->content.string)+1;
235            
236      titem= env->gc_ref->next;      titem= env->gc_ref->next;
237      env->gc_ref->next= new_head;      env->gc_ref->next= new_head;
# Line 267  extern void gc_init(environment *env) Line 250  extern void gc_init(environment *env)
250    
251  }  }
252    
253    
254    inline void gc_maybe(environment *env)
255    {
256      if(env->gc_count < env->gc_limit)
257        return;
258      else
259        return gc_init(env);
260    }
261    
262    
263  /* Protect values from GC */  /* Protect values from GC */
264  void protect(value *val)  void protect(value *val)
265  {  {
# Line 281  void protect(value *val) Line 274  void protect(value *val)
274    }    }
275  }  }
276    
277    
278  /* Unprotect values from GC */  /* Unprotect values from GC */
279  void unprotect(value *val)  void unprotect(value *val)
280  {  {
# Line 295  void unprotect(value *val) Line 289  void unprotect(value *val)
289    }    }
290  }  }
291    
292    
293  /* Push a value onto the stack */  /* Push a value onto the stack */
294  void push_val(environment *env, value *val)  void push_val(environment *env, value *val)
295  {  {
# Line 309  void push_val(environment *env, value *v Line 304  void push_val(environment *env, value *v
304    env->head= new_value;    env->head= new_value;
305  }  }
306    
307    
308  /* Push an integer onto the stack */  /* Push an integer onto the stack */
309  void push_int(environment *env, int in_val)  void push_int(environment *env, int in_val)
310  {  {
# Line 320  void push_int(environment *env, int in_v Line 316  void push_int(environment *env, int in_v
316    push_val(env, new_value);    push_val(env, new_value);
317  }  }
318    
319    
320  /* Push a floating point number onto the stack */  /* Push a floating point number onto the stack */
321  void push_float(environment *env, float in_val)  void push_float(environment *env, float in_val)
322  {  {
# Line 331  void push_float(environment *env, float Line 328  void push_float(environment *env, float
328    push_val(env, new_value);    push_val(env, new_value);
329  }  }
330    
331    
332  /* Copy a string onto the stack. */  /* Copy a string onto the stack. */
333  void push_cstring(environment *env, const char *in_string)  void push_cstring(environment *env, const char *in_string)
334  {  {
335    value *new_value= new_val(env);    value *new_value= new_val(env);
336    int length= strlen(in_string)+1;    int length= strlen(in_string)+1;
337    
338    new_value->content.ptr= malloc(length);    new_value->content.string= malloc(length);
339    assert(new_value != NULL);    assert(new_value != NULL);
340    env->gc_count += length;    env->gc_count += length;
341    strcpy(new_value->content.ptr, in_string);    strcpy(new_value->content.string, in_string);
342    new_value->type= string;    new_value->type= string;
343    
344    push_val(env, new_value);    push_val(env, new_value);
345  }  }
346    
347    
348  /* Mangle a symbol name to a valid C identifier name */  /* Mangle a symbol name to a valid C identifier name */
349  char *mangle_str(const char *old_string)  char *mangle_str(const char *old_string)
350  {  {
# Line 356  char *mangle_str(const char *old_string) Line 355  char *mangle_str(const char *old_string)
355    assert(new_string != NULL);    assert(new_string != NULL);
356    strcpy(new_string, "sx_");    /* Stack eXternal */    strcpy(new_string, "sx_");    /* Stack eXternal */
357    current= new_string+3;    current= new_string+3;
358    
359    while(old_string[0] != '\0'){    while(old_string[0] != '\0'){
360      current[0]= validchars[(unsigned char)(old_string[0])/16];      current[0]= validchars[(unsigned char)(old_string[0])/16];
361      current[1]= validchars[(unsigned char)(old_string[0])%16];      current[1]= validchars[(unsigned char)(old_string[0])%16];
# Line 367  char *mangle_str(const char *old_string) Line 367  char *mangle_str(const char *old_string)
367    return new_string;            /* The caller must free() it */    return new_string;            /* The caller must free() it */
368  }  }
369    
 extern void mangle(environment *env)  
 {  
   char *new_string;  
   
   if(env->head->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   if(CAR(env->head)->type!=string) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
   
   new_string=  
     mangle_str((const char *)(CAR(env->head)->content.ptr));  
   
   toss(env);  
   if(env->err) return;  
   
   push_cstring(env, new_string);  
 }  
370    
371  /* Push a symbol onto the stack. */  /* Push a symbol onto the stack. */
372  void push_sym(environment *env, const char *in_string)  void push_sym(environment *env, const char *in_string)
# Line 408  void push_sym(environment *env, const ch Line 384  void push_sym(environment *env, const ch
384    char *mangled;                /* Mangled function name */    char *mangled;                /* Mangled function name */
385    
386    new_value= new_val(env);    new_value= new_val(env);
   protect(new_value);  
387    new_fvalue= new_val(env);    new_fvalue= new_val(env);
   protect(new_fvalue);  
388    
389    /* The new value is a symbol */    /* The new value is a symbol */
390    new_value->type= symb;    new_value->type= symb;
391    
392    /* Look up the symbol name in the hash table */    /* Look up the symbol name in the hash table */
393    new_symbol= hash(env->symbols, in_string);    new_symbol= hash(env->symbols, in_string);
394    new_value->content.ptr= *new_symbol;    new_value->content.sym= *new_symbol;
395    
396    if(*new_symbol==NULL) { /* If symbol was undefined */    if(*new_symbol==NULL) { /* If symbol was undefined */
397    
# Line 431  void push_sym(environment *env, const ch Line 405  void push_sym(environment *env, const ch
405      strcpy((*new_symbol)->id, in_string);      strcpy((*new_symbol)->id, in_string);
406    
407      /* Intern the new symbol in the hash table */      /* Intern the new symbol in the hash table */
408      new_value->content.ptr= *new_symbol;      new_value->content.sym= *new_symbol;
409    
410      /* 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
411         we should bind the symbol to a new function pointer value */         we should bind the symbol to a new function pointer value */
# Line 449  void push_sym(environment *env, const ch Line 423  void push_sym(environment *env, const ch
423    
424      if(dlerr==NULL) {           /* If a function was found */      if(dlerr==NULL) {           /* If a function was found */
425        new_fvalue->type= func;   /* The new value is a function pointer */        new_fvalue->type= func;   /* The new value is a function pointer */
426        new_fvalue->content.ptr= funcptr; /* Store function pointer */        new_fvalue->content.func= funcptr; /* Store function pointer */
427        (*new_symbol)->val= new_fvalue; /* Bind the symbol to the new        (*new_symbol)->val= new_fvalue; /* Bind the symbol to the new
428                                           function value */                                           function value */
429      }      }
# Line 458  void push_sym(environment *env, const ch Line 432  void push_sym(environment *env, const ch
432    }    }
433    
434    push_val(env, new_value);    push_val(env, new_value);
   unprotect(new_value); unprotect(new_fvalue);  
435  }  }
436    
 /* Print newline. */  
 extern void nl()  
 {  
   printf("\n");  
 }  
   
 /* 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);  
 }      
437    
438  /* Print a value */  /* Print a value */
439  void print_val(value *val, int noquote, stackitem *stack)  void print_val(environment *env, value *val, int noquote, stackitem *stack,
440                   FILE *stream)
441  {  {
442    stackitem *titem, *tstack;    stackitem *titem, *tstack;
443    int depth;    int depth;
444    
445    switch(val->type) {    switch(val->type) {
446    case empty:    case empty:
447      printf("[]");      if(fprintf(stream, "[]") < 0){
448          perror("print_val");
449          env->err= 5;
450          return;
451        }
452        break;
453      case unknown:
454        if(fprintf(stream, "UNKNOWN") < 0){
455          perror("print_val");
456          env->err= 5;
457          return;
458        }
459      break;      break;
460    case integer:    case integer:
461      printf("%d", val->content.i);      if(fprintf(stream, "%d", val->content.i) < 0){
462          perror("print_val");
463          env->err= 5;
464          return;
465        }
466      break;      break;
467    case tfloat:    case tfloat:
468      printf("%f", val->content.f);      if(fprintf(stream, "%f", val->content.f) < 0){
469          perror("print_val");
470          env->err= 5;
471          return;
472        }
473      break;      break;
474    case string:    case string:
475      if(noquote)      if(noquote){
476        printf("%s", (char*)(val->content.ptr));        if(fprintf(stream, "%s", val->content.string) < 0){
477      else          perror("print_val");
478        printf("\"%s\"", (char*)(val->content.ptr));          env->err= 5;
479            return;
480          }
481        } else {                    /* quote */
482          if(fprintf(stream, "\"%s\"", val->content.string) < 0){
483            perror("print_val");
484            env->err= 5;
485            return;
486          }
487        }
488      break;      break;
489    case symb:    case symb:
490      printf("%s", val->content.sym->id);      if(fprintf(stream, "%s", val->content.sym->id) < 0){
491          perror("print_val");
492          env->err= 5;
493          return;
494        }
495      break;      break;
496    case func:    case func:
497      printf("#<function %p>", (funcp)(val->content.ptr));      if(fprintf(stream, "#<function %p>", val->content.func) < 0){
498          perror("print_val");
499          env->err= 5;
500          return;
501        }
502        break;
503      case port:
504        if(fprintf(stream, "#<port %p>", val->content.p) < 0){
505          perror("print_val");
506          env->err= 5;
507          return;
508        }
509      break;      break;
510    case tcons:    case tcons:
511      printf("[ ");      if(fprintf(stream, "[ ") < 0){
512          perror("print_val");
513          env->err= 5;
514          return;
515        }
516      tstack= stack;      tstack= stack;
517    
518      do {      do {
519        titem=malloc(sizeof(stackitem));        titem=malloc(sizeof(stackitem));
520        assert(titem != NULL);        assert(titem != NULL);
# Line 545  void print_val(value *val, int noquote, Line 525  void print_val(value *val, int noquote,
525           printing this value */           printing this value */
526        titem=tstack;        titem=tstack;
527        depth=0;        depth=0;
528    
529        while(titem != NULL && titem->item != CAR(val)){        while(titem != NULL && titem->item != CAR(val)){
530          titem=titem->next;          titem=titem->next;
531          depth++;          depth++;
532        }        }
533    
534        if(titem != NULL){        /* If we found it on the stack, */        if(titem != NULL){        /* If we found it on the stack, */
535          printf("#%d#", depth);  /* print a depth reference */          if(fprintf(stream, "#%d#", depth) < 0){ /* print a depth reference */
536              perror("print_val");
537              env->err= 5;
538              free(titem);
539              return;
540            }
541        } else {        } else {
542          print_val(CAR(val), noquote, tstack);          print_val(env, CAR(val), noquote, tstack, stream);
543        }        }
544    
545        val= CDR(val);        val= CDR(val);
546        switch(val->type){        switch(val->type){
547        case empty:        case empty:
# Line 563  void print_val(value *val, int noquote, Line 551  void print_val(value *val, int noquote,
551             printing this value */             printing this value */
552          titem=tstack;          titem=tstack;
553          depth=0;          depth=0;
554    
555          while(titem != NULL && titem->item != val){          while(titem != NULL && titem->item != val){
556            titem=titem->next;            titem=titem->next;
557            depth++;            depth++;
558          }          }
559          if(titem != NULL){      /* If we found it on the stack, */          if(titem != NULL){      /* If we found it on the stack, */
560            printf(" . #%d#", depth); /* print a depth reference */            if(fprintf(stream, " . #%d#", depth) < 0){ /* print a depth reference */
561                perror("print_val");
562                env->err= 5;
563                goto printval_end;
564              }
565          } else {          } else {
566            printf(" ");            if(fprintf(stream, " ") < 0){
567                perror("print_val");
568                env->err= 5;
569                goto printval_end;
570              }
571          }          }
572          break;          break;
573        default:        default:
574          printf(" . ");          /* Improper list */          if(fprintf(stream, " . ") < 0){ /* Improper list */
575          print_val(val, noquote, tstack);            perror("print_val");
576              env->err= 5;
577              goto printval_end;
578            }
579            print_val(env, val, noquote, tstack, stream);
580        }        }
581      } while(val->type == tcons && titem == NULL);      } while(val->type == tcons && titem == NULL);
582    
583      printval_end:
584    
585      titem=tstack;      titem=tstack;
586      while(titem != stack){      while(titem != stack){
587        tstack=titem->next;        tstack=titem->next;
588        free(titem);        free(titem);
589        titem=tstack;        titem=tstack;
590      }      }
     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();  
 }  
591    
592  /* Prints the top element of the stack and then discards it. */      if(! (env->err)){
593  extern void print(environment *env)        if(fprintf(stream, " ]") < 0){
594  {          perror("print_val");
595    print_(env);          env->err= 5;
596    if(env->err) return;        }
597    toss(env);      }
598  }      break;
   
 extern void princ_(environment *env)  
 {  
   if(env->head->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
599    }    }
   print_val(CAR(env->head), 1, NULL);  
 }  
   
 /* 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();  
600  }  }
601    
 /* Prints the stack. */  
 extern void printstack(environment *env)  
 {  
   if(env->head->type == empty) {  
     printf("Stack Empty\n");  
     return;  
   }  
   
   print_st(env->head, 1);  
 }  
602    
603  /* Swap the two top elements on the stack. */  /* Swap the two top elements on the stack. */
604  extern void swap(environment *env)  extern void swap(environment *env)
605  {  {
606    value *temp= env->head;    value *temp= env->head;
     
   if(env->head->type == empty || CDR(env->head)->type == empty) {  
     printerr("Too Few Arguments");  
     env->err=1;  
     return;  
   }  
607    
608      if(check_args(env, unknown, unknown, empty))
609        return printerr(env);
610      
611    env->head= CDR(env->head);    env->head= CDR(env->head);
612    CDR(temp)= CDR(env->head);    CDR(temp)= CDR(env->head);
613    CDR(env->head)= temp;    CDR(env->head)= temp;
614  }  }
615    
 /* 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;  
 }  
616    
617  /* Recall a value from a symbol, if bound */  /* Recall a value from a symbol, if bound */
618  extern void rcl(environment *env)  extern void rcl(environment *env)
619  {  {
620    value *val;    value *val;
621    
622    if(env->head->type==empty) {    if(check_args(env, symb, empty))
623      printerr("Too Few Arguments");      return printerr(env);
     env->err= 1;  
     return;  
   }  
   
   if(CAR(env->head)->type!=symb) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
624    
625    val= CAR(env->head)->content.sym->val;    val= CAR(env->head)->content.sym->val;
626    if(val == NULL){    if(val == NULL){
     printerr("Unbound Variable");  
627      env->err= 3;      env->err= 3;
628      return;      return printerr(env);
629    }    }
630    
631    push_val(env, val);           /* Return the symbol's bound value */    push_val(env, val);           /* Return the symbol's bound value */
632    swap(env);    swap(env);
633    if(env->err) return;    if(env->err) return;
634    toss(env);                    /* toss the symbol */    env->head= CDR(env->head);
   if(env->err) return;  
635  }  }
636    
637    
638  /* 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
639     function value, and if it is, toss the symbol and execute the     function value, and if it is, toss the symbol and execute the
640     function. */     function. */
# Line 723  extern void eval(environment *env) Line 648  extern void eval(environment *env)
648    
649    gc_maybe(env);    gc_maybe(env);
650    
651    if(env->head->type==empty) {    if(check_args(env, unknown, empty))
652      printerr("Too Few Arguments");      return printerr(env);
     env->err= 1;  
     return;  
   }  
653    
654    switch(CAR(env->head)->type) {    switch(CAR(env->head)->type) {
655      /* if it's a symbol */      /* if it's a symbol */
656    case symb:    case symb:
657        env->errsymb= CAR(env->head)->content.sym->id;
658      rcl(env);                   /* get its contents */      rcl(env);                   /* get its contents */
659      if(env->err) return;      if(env->err) return;
660      if(CAR(env->head)->type!=symb){ /* don't recurse symbols */      if(CAR(env->head)->type!=symb){ /* don't recurse symbols */
# Line 741  extern void eval(environment *env) Line 664  extern void eval(environment *env)
664    
665      /* If it's a lone function value, run it */      /* If it's a lone function value, run it */
666    case func:    case func:
667      in_func= (funcp)(CAR(env->head)->content.ptr);      in_func= CAR(env->head)->content.func;
668      toss(env);      env->head= CDR(env->head);
669      if(env->err) return;      return in_func((void*)env);
     return in_func(env);  
670    
671      /* If it's a list */      /* If it's a list */
672    case tcons:    case tcons:
673      temp_val= CAR(env->head);      temp_val= CAR(env->head);
674      protect(temp_val);      protect(temp_val);
675    
676      toss(env); if(env->err) return;      env->head= CDR(env->head);
677      iterator= temp_val;      iterator= temp_val;
678            
679      while(iterator->type != empty) {      while(iterator->type != empty) {
680        push_val(env, CAR(iterator));        push_val(env, CAR(iterator));
681                
682        if(CAR(env->head)->type==symb       if(CAR(env->head)->type==symb
683           && CAR(env->head)->content.sym->id[0]==';') {           && CAR(env->head)->content.sym->id[0]==';') {
684          toss(env);          env->head= CDR(env->head);
         if(env->err) return;  
685                    
686          if(CDR(iterator)->type == empty){          if(CDR(iterator)->type == empty){
687            goto eval_start;            goto eval_start;
# Line 771  extern void eval(environment *env) Line 692  extern void eval(environment *env)
692        if (CDR(iterator)->type == empty || CDR(iterator)->type == tcons)        if (CDR(iterator)->type == empty || CDR(iterator)->type == tcons)
693          iterator= CDR(iterator);          iterator= CDR(iterator);
694        else {        else {
695          printerr("Bad Argument Type"); /* Improper list */          env->err= 2; /* Improper list */
696          env->err= 2;          return printerr(env);
         return;  
697        }        }
698      }      }
699      unprotect(temp_val);      unprotect(temp_val);
700      return;      return;
701    
702    case empty:    case empty:
703        env->head= CDR(env->head);
704    case integer:    case integer:
705    case tfloat:    case tfloat:
706    case string:    case string:
707      case port:
708      case unknown:
709      return;      return;
710    }    }
711  }  }
712    
 /* 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;  
     }  
   }  
 }  
713    
714  /* Internal forget function */  /* Internal forget function */
715  void forget_sym(symbol **hash_entry)  void forget_sym(symbol **hash_entry)
# Line 1041  void forget_sym(symbol **hash_entry) Line 723  void forget_sym(symbol **hash_entry)
723    free(temp);    free(temp);
724  }  }
725    
 /* 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);  
 }  
726    
727  int main(int argc, char **argv)  int main(int argc, char **argv)
728  {  {
729    environment myenv;    environment myenv;
   
730    int c;                        /* getopt option character */    int c;                        /* getopt option character */
731    
732  #ifdef __linux__  #ifdef __linux__
# Line 1108  int main(int argc, char **argv) Line 761  int main(int argc, char **argv)
761      }      }
762    }    }
763    
764    if(myenv.interactive) {    if(myenv.interactive)
765      printf("Stack version $Revision$\n\      puts(start_message);
 Copyright (C) 2002  Mats Alritzson and Teddy Hogeborn\n\  
 Stack comes with ABSOLUTELY NO WARRANTY; for details type 'warranty;'.\n\  
 This is free software, and you are welcome to redistribute it\n\  
 under certain conditions; type 'copying;' for details.\n");  
   }  
766    
767    while(1) {    while(1) {
768      if(myenv.in_string==NULL) {      if(myenv.in_string==NULL) {
769        if (myenv.interactive) {        if (myenv.interactive) {
770          if(myenv.err) {          if(myenv.err) {
771            printf("(error %d)\n", myenv.err);            printf("(error %d)\n", myenv.err);
772              myenv.err= 0;
773          }          }
774          nl();          printf("\n");
775          printstack(&myenv);          printstack(&myenv);
776          printf("> ");          printf("> ");
777        }        }
778        myenv.err=0;        myenv.err=0;
779      }      }
780      sx_72656164(&myenv);        /* "read" */      readstream(&myenv, myenv.inputstream);
781      if (myenv.err==4) {         /* EOF */      if (myenv.err) {            /* EOF or other error */
782        myenv.err=0;        myenv.err=0;
783        quit(&myenv);        quit(&myenv);
784      } else if(myenv.head->type!=empty      } else if(myenv.head->type!=empty
785                && CAR(myenv.head)->type==symb                && CAR(myenv.head)->type==symb
786                && CAR(myenv.head)->content.sym->id[0]                && CAR(myenv.head)->content.sym->id[0] == ';') {
787                ==';') {        if(myenv.head->type != empty)
788        toss(&myenv);             /* No error check in main */          myenv.head= CDR(myenv.head);
789        eval(&myenv);        eval(&myenv);
790        } else {
791          gc_maybe(&myenv);
792      }      }
     gc_maybe(&myenv);  
793    }    }
794    quit(&myenv);    quit(&myenv);
795    return EXIT_FAILURE;    return EXIT_FAILURE;
796  }  }
797    
 /* "+" */  
 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);  
     assert(new_string != NULL);  
     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);  
 }  
798    
799  /* Return copy of a value */  /* Return copy of a value */
800  value *copy_val(environment *env, value *old_value)  value *copy_val(environment *env, value *old_value)
# Line 1376  value *copy_val(environment *env, value Line 804  value *copy_val(environment *env, value
804    if(old_value==NULL)    if(old_value==NULL)
805      return NULL;      return NULL;
806    
   protect(old_value);  
807    new_value= new_val(env);    new_value= new_val(env);
808    new_value->type= old_value->type;    new_value->type= old_value->type;
809    
# Line 1386  value *copy_val(environment *env, value Line 813  value *copy_val(environment *env, value
813    case func:    case func:
814    case symb:    case symb:
815    case empty:    case empty:
816      case unknown:
817      case port:
818      new_value->content= old_value->content;      new_value->content= old_value->content;
819      break;      break;
820    case string:    case string:
821      (char *)(new_value->content.ptr)=      new_value->content.string= strdup(old_value->content.string);
       strdup((char *)(old_value->content.ptr));  
822      break;      break;
823    case tcons:    case tcons:
824    
# Line 1403  value *copy_val(environment *env, value Line 831  value *copy_val(environment *env, value
831      break;      break;
832    }    }
833    
   unprotect(old_value);  
   
834    return new_value;    return new_value;
835  }  }
836    
 /* "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);  
 }  
837    
838  extern void then(environment *env)  /* read a line from a stream; used by readline */
839    void readlinestream(environment *env, FILE *stream)
840  {  {
841    if(env->head->type==empty || CDR(env->head)->type==empty    char in_string[101];
      || 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;  
   }  
   
   swap(env); toss(env);  
   sx_6966(env);  
 }  
   
 /* "while" */  
 extern void sx_7768696c65(environment *env)  
 {  
   int truth;  
   value *loop, *test;  
   
   if(env->head->type==empty || CDR(env->head)->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
842    
843    loop= CAR(env->head);    if(fgets(in_string, 100, stream)==NULL) {
844    protect(loop);      push_cstring(env, "");
845    toss(env); if(env->err) return;      if (! feof(stream)){
846          perror("readline");
847    test= CAR(env->head);        env->err= 5;
   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);  
848      }      }
849        } else {
850    } while(truth);      push_cstring(env, in_string);
851      }
   unprotect(loop); unprotect(test);  
852  }  }
853    
854    
855  /* "for"; for-loop */  /* Reverse (flip) a list */
856  extern void sx_666f72(environment *env)  extern void rev(environment *env)
857  {  {
858    value *loop;    value *old_head, *new_head, *item;
   int foo1, foo2;  
859    
860    if(env->head->type==empty || CDR(env->head)->type==empty    if(CAR(env->head)->type==empty)
861       || CDR(CDR(env->head))->type==empty) {      return;                     /* Don't reverse an empty list */
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
862    
863    if(CAR(CDR(env->head))->type!=integer    if(check_args(env, tcons, empty))
864       || CAR(CDR(CDR(env->head)))->type!=integer) {      return printerr(env);
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
865    
866    loop= CAR(env->head);    old_head= CAR(env->head);
867    protect(loop);    new_head= new_val(env);
868    toss(env); if(env->err) return;    while(old_head->type != empty) {
869        item= old_head;
870    foo2= CAR(env->head)->content.i;      old_head= CDR(old_head);
871    toss(env); if(env->err) return;      CDR(item)= new_head;
872        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--;  
     }  
873    }    }
874    unprotect(loop);    CAR(env->head)= new_head;
875  }  }
876    
 /* 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;  
   }  
   
   if(CAR(CDR(env->head))->type!=tcons) {  
     printerr("Bad Argument Type");  
     env->err= 2;  
     return;  
   }  
877    
878    loop= CAR(env->head);  /* Make a list. */
879    protect(loop);  extern void pack(environment *env)
   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)  
880  {  {
881    int ending, start, i;    value *iterator, *temp, *ending;
   value *iterator, *temp, *end;  
   
   end= new_val(env);  
   
   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;  
   }  
882    
883    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);  
   }  
884    
885    iterator= env->head;    iterator= env->head;
886      if(iterator->type == empty
   if(iterator->type==empty  
887       || (CAR(iterator)->type==symb       || (CAR(iterator)->type==symb
888           && CAR(iterator)->content.sym->id[0]=='[')) {       && CAR(iterator)->content.sym->id[0]=='[')) {
889      temp= end;      temp= ending;
890      toss(env);      if(env->head->type != empty)
891          env->head= CDR(env->head);
892    } else {    } else {
893      /* Search for first delimiter */      /* Search for first delimiter */
894      while(CDR(iterator)->type!=empty      while(CDR(iterator)->type != empty
895            && (CAR(CDR(iterator))->type!=symb            && (CAR(CDR(iterator))->type!=symb
896                || CAR(CDR(iterator))->content.sym->id[0]!='['))             || CAR(CDR(iterator))->content.sym->id[0]!='['))
897        iterator= CDR(iterator);        iterator= CDR(iterator);
898            
899      /* Extract list */      /* Extract list */
900      temp= env->head;      temp= env->head;
901      env->head= CDR(iterator);      env->head= CDR(iterator);
902      CDR(iterator)= end;      CDR(iterator)= ending;
903    
904      if(env->head->type!=empty)      if(env->head->type != empty)
905        toss(env);        env->head= CDR(env->head);
906    }    }
907    
908    /* Push list */    /* Push list */
909    
910    push_val(env, temp);    push_val(env, temp);
911      rev(env);
912  }  }
913    
 /* Read a string */  
 extern void readline(environment *env)  
 {  
   char in_string[101];  
   
   if(fgets(in_string, 100, env->inputstream)==NULL)  
     push_cstring(env, "");  
   else  
     push_cstring(env, in_string);  
 }  
914    
915  /* "read"; Read a value and place on stack */  /* read from a stream; used by "read" and "readport" */
916  extern void sx_72656164(environment *env)  void readstream(environment *env, FILE *stream)
917  {  {
918    const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%n";    const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%n";
919    const char strform[]= "\"%[^\"]\"%n";    const char strform[]= "\"%[^\"]\"%n";
# Line 1763  extern void sx_72656164(environment *env Line 935  extern void sx_72656164(environment *env
935      if(depth > 0 && env->interactive) {      if(depth > 0 && env->interactive) {
936        printf("]> ");        printf("]> ");
937      }      }
938      readline(env); if(env->err) return;      readlinestream(env, env->inputstream);
939        if(env->err) return;
940    
941      if(((char *)(CAR(env->head)->content.ptr))[0]=='\0'){      if((CAR(env->head)->content.string)[0]=='\0'){
942        env->err= 4;              /* "" means EOF */        env->err= 4;              /* "" means EOF */
943        return;        return;
944      }      }
945            
946      env->in_string= malloc(strlen(CAR(env->head)->content.ptr)+1);      env->in_string= malloc(strlen(CAR(env->head)->content.string)+1);
947      assert(env->in_string != NULL);      assert(env->in_string != NULL);
948      env->free_string= env->in_string; /* Save the original pointer */      env->free_string= env->in_string; /* Save the original pointer */
949      strcpy(env->in_string, CAR(env->head)->content.ptr);      strcpy(env->in_string, CAR(env->head)->content.string);
950      toss(env); if(env->err) return;      env->head= CDR(env->head);
951    }    }
952        
953    inlength= strlen(env->in_string)+1;    inlength= strlen(env->in_string)+1;
# Line 1823  extern void sx_72656164(environment *env Line 996  extern void sx_72656164(environment *env
996    free(match);    free(match);
997    
998    if(depth)    if(depth)
999      return sx_72656164(env);      return readstream(env, env->inputstream);
1000  }  }
1001    
 #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);  
1002    
1003      return;  int check_args(environment *env, ...)
   }  
   
   printerr("Bad Argument Type");  
   env->err= 2;  
 }  
   
 /* "/" */  
 extern void sx_2f(environment *env)  
1004  {  {
1005    int a, b;    va_list ap;
1006    float fa, fb;    enum type_enum mytype;
1007    
1008    if(env->head->type==empty || CDR(env->head)->type==empty) {    value *iter= env->head;
1009      printerr("Too Few Arguments");    int errval= 0;
     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;  
   }  
1010    
1011    if(CAR(env->head)->type==tfloat    va_start(ap, env);
1012       && CAR(CDR(env->head))->type==tfloat) {    while(1) {
1013      fa= CAR(env->head)->content.f;      mytype= va_arg(ap, enum type_enum);
1014      toss(env); if(env->err) return;      //    fprintf(stderr, "%s\n", env->errsymb);
     fb= CAR(env->head)->content.f;  
     toss(env); if(env->err) return;  
     push_float(env, fb/fa);  
       
     return;  
   }  
1015    
1016    if(CAR(env->head)->type==tfloat      if(mytype==empty)
1017       && CAR(CDR(env->head))->type==integer) {        break;
     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);  
1018            
1019      return;      if(iter->type==empty || iter==NULL) {
1020    }        errval= 1;
1021          break;
   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;  
 }  
   
 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;  
   }  
   
   CAR(CAR(CDR(env->head)))=CAR(env->head);  
   toss(env);  
 }  
   
 extern void setcdr(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;  
   }  
   
   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;  
   }  
   
   CAR(env->head)=CAR(CAR(env->head));  
 }  
   
 extern void cdr(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;  
   }  
   
   CAR(env->head)=CDR(CAR(env->head));  
 }  
   
 extern void cons(environment *env)  
 {  
   value *val;  
   
   if(env->head->type==empty || CDR(env->head)->type==empty) {  
     printerr("Too Few Arguments");  
     env->err= 1;  
     return;  
   }  
   
   val=new_val(env);  
   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);  
   
   swap(env); if(env->err) return;  
   toss(env); if(env->err) return;  
   swap(env); if(env->err) return;  
   toss(env); if(env->err) return;  
 }  
   
 /*  2: 3                        =>                */  
 /*  1: [ [ 1 . 2 ] [ 3 . 4 ] ]  =>  1: [ 3 . 4 ]  */  
 extern void assq(environment *env)  
 {  
   assocgen(env, eq);  
 }  
   
   
 /* General assoc function */  
 void assocgen(environment *env, funcp eqfunc)  
 {  
   value *key, *item;  
   
   /* Needs two values on the stack, the top one must be an association  
      list */  
   if(env->head->type==empty || CDR(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;  
   }  
   
   key=CAR(CDR(env->head));  
   item=CAR(env->head);  
   
   while(item->type == tcons){  
     if(CAR(item)->type != tcons){  
       printerr("Bad Argument Type");  
       env->err= 2;  
       return;  
     }  
     push_val(env, key);  
     push_val(env, CAR(CAR(item)));  
     eqfunc(env); if(env->err) return;  
   
     /* Check the result of 'eqfunc' */  
     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;  
1022      }      }
1023    
1024      if(CAR(env->head)->content.i){      if(mytype==unknown) {
1025        toss(env); if(env->err) return;        iter=CDR(iter);
1026        break;        continue;
1027      }      }
     toss(env); if(env->err) return;  
1028    
1029      if(item->type!=tcons) {      if(CAR(iter)->type!=mytype) {
1030        printerr("Bad Argument Type");        errval= 2;
1031        env->err= 2;        break;
       return;  
1032      }      }
1033    
1034      item=CDR(item);      iter= CDR(iter);
1035    }    }
1036    
1037    if(item->type == tcons){      /* A match was found */    va_end(ap);
1038      push_val(env, CAR(item));  
1039    } else {    env->err= errval;
1040      push_int(env, 0);    return errval;
   }  
   swap(env); if(env->err) return;  
   toss(env); if(env->err) return;  
   swap(env); if(env->err) return;  
   toss(env);  
1041  }  }
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