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revision 1.58 by masse, Fri Feb 8 03:45:00 2002 UTC revision 1.98 by masse, Sun Mar 10 09:13:36 2002 UTC
# Line 1  Line 1 
1  /* printf, sscanf, fgets, fprintf */  /*
2        stack - an interactive interpreter for a stack-based language
3        Copyright (C) 2002  Mats Alritzson and Teddy Hogeborn
4    
5        This program is free software; you can redistribute it and/or modify
6        it under the terms of the GNU General Public License as published by
7        the Free Software Foundation; either version 2 of the License, or
8        (at your option) any later version.
9    
10        This program is distributed in the hope that it will be useful,
11        but WITHOUT ANY WARRANTY; without even the implied warranty of
12        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13        GNU General Public License for more details.
14    
15        You should have received a copy of the GNU General Public License
16        along with this program; if not, write to the Free Software
17        Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18    
19        Authors: Mats Alritzson <masse@fukt.bth.se>
20                 Teddy Hogeborn <teddy@fukt.bth.se>
21    */
22    
23    /* printf, sscanf, fgets, fprintf, fopen, perror */
24  #include <stdio.h>  #include <stdio.h>
25  /* exit, EXIT_SUCCESS, malloc, free */  /* exit, EXIT_SUCCESS, malloc, free */
26  #include <stdlib.h>  #include <stdlib.h>
# Line 8  Line 30 
30  #include <dlfcn.h>  #include <dlfcn.h>
31  /* strcmp, strcpy, strlen, strcat, strdup */  /* strcmp, strcpy, strlen, strcat, strdup */
32  #include <string.h>  #include <string.h>
33    /* getopt, STDIN_FILENO, STDOUT_FILENO, usleep */
34    #include <unistd.h>
35    /* EX_NOINPUT, EX_USAGE */
36    #include <sysexits.h>
37    /* mtrace, muntrace */
38    #include <mcheck.h>
39    /* ioctl */
40    #include <sys/ioctl.h>
41    /* KDMKTONE */
42    #include <linux/kd.h>
43    
44  #define HASHTBLSIZE 65536  #include "stack.h"
   
 /* First, define some types. */  
   
 /* A value of some type */  
 typedef struct {  
   enum {  
     integer,  
     string,  
     func,                       /* Function pointer */  
     symb,  
     list  
   } type;                       /* Type of stack element */  
   
   union {  
     void *ptr;                  /* Pointer to the content */  
     int val;                    /* ...or an integer */  
   } content;                    /* Stores a pointer or an integer */  
   
   int refcount;                 /* Reference counter */  
   
 } value;  
   
 /* A symbol with a name and possible value */  
 /* (These do not need reference counters, they are kept unique by  
    hashing.) */  
 typedef struct symbol_struct {  
   char *id;                     /* Symbol name */  
   value *val;                   /* The value (if any) bound to it */  
   struct symbol_struct *next;   /* In case of hashing conflicts, a */  
 } symbol;                       /* symbol is a kind of stack item. */  
   
 /* A type for a hash table for symbols */  
 typedef symbol *hashtbl[HASHTBLSIZE]; /* Hash table declaration */  
   
 /* An item (value) on a stack */  
 typedef struct stackitem_struct  
 {  
   value *item;                  /* The value on the stack */  
                                 /* (This is never NULL) */  
   struct stackitem_struct *next; /* Next item */  
 } stackitem;  
   
 /* An environment; gives access to the stack and a hash table of  
    defined symbols */  
 typedef struct {  
   stackitem *head;              /* Head of the stack */  
   hashtbl symbols;              /* Hash table of all variable bindings */  
   int err;                      /* Error flag */  
   int non_eval_flag;  
 } environment;  
   
 /* A type for pointers to external functions */  
 typedef void (*funcp)(environment *); /* funcp is a pointer to a void  
                                          function (environment *) */  
45    
46  /* Initialize a newly created environment */  /* Initialize a newly created environment */
47  void init_env(environment *env)  void init_env(environment *env)
48  {  {
49    int i;    int i;
50    
51    env->err= 0;    env->gc_limit= 200;
52    env->non_eval_flag= 0;    env->gc_count= 0;
53      env->gc_ref= NULL;
54    
55      env->head= NULL;
56    for(i= 0; i<HASHTBLSIZE; i++)    for(i= 0; i<HASHTBLSIZE; i++)
57      env->symbols[i]= NULL;      env->symbols[i]= NULL;
58      env->err= 0;
59      env->in_string= NULL;
60      env->free_string= NULL;
61      env->inputstream= stdin;
62      env->interactive= 1;
63  }  }
64    
65  void printerr(const char* in_string) {  void printerr(const char* in_string)
66    {
67    fprintf(stderr, "Err: %s\n", in_string);    fprintf(stderr, "Err: %s\n", in_string);
68  }  }
69    
 /* Throw away a value */  
 void free_val(value *val){  
   stackitem *item, *temp;  
   
   val->refcount--;              /* Decrease the reference count */  
   if(val->refcount == 0){  
     switch (val->type){         /* and free the contents if necessary */  
     case string:  
       free(val->content.ptr);  
       break;  
     case list:                  /* lists needs to be freed recursively */  
       item=val->content.ptr;  
       while(item != NULL) {     /* for all stack items */  
         free_val(item->item);   /* free the value */  
         temp=item->next;        /* save next ptr */  
         free(item);             /* free the stackitem */  
         item=temp;              /* go to next stackitem */  
       }  
       free(val);                /* Free the actual list value */  
       break;  
     case integer:  
     case func:  
     case symb:  
       break;  
     }  
   }  
 }  
   
70  /* Discard the top element of the stack. */  /* Discard the top element of the stack. */
71  extern void toss(environment *env)  extern void toss(environment *env)
72  {  {
# Line 115  extern void toss(environment *env) Line 74  extern void toss(environment *env)
74    
75    if((env->head)==NULL) {    if((env->head)==NULL) {
76      printerr("Too Few Arguments");      printerr("Too Few Arguments");
77      env->err=1;      env->err= 1;
78      return;      return;
79    }    }
80        
   free_val(env->head->item);    /* Free the value */  
81    env->head= env->head->next;   /* Remove the top stack item */    env->head= env->head->next;   /* Remove the top stack item */
82    free(temp);                   /* Free the old top stack item */    free(temp);                   /* Free the old top stack item */
83    
84      env->gc_limit--;
85  }  }
86    
87  /* 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. */
# Line 153  symbol **hash(hashtbl in_hashtbl, const Line 113  symbol **hash(hashtbl in_hashtbl, const
113    }    }
114  }  }
115    
116  /* Generic push function. */  /* Create new value */
117  void push(stackitem** stack_head, stackitem* in_item)  value* new_val(environment *env)
118    {
119      value *nval= malloc(sizeof(value));
120      stackitem *nitem= malloc(sizeof(stackitem));
121    
122      nval->content.ptr= NULL;
123    
124      nitem->item= nval;
125      nitem->next= env->gc_ref;
126      env->gc_ref= nitem;
127    
128      env->gc_count++;
129      nval->gc_garb= 1;
130    
131      return nval;
132    }
133    
134    /* Mark values recursively.
135       Marked values are not collected by the GC. */
136    inline void gc_mark(value *val)
137    {
138      stackitem *iterator;
139    
140      if(val->gc_garb==0)
141        return;
142    
143      val->gc_garb= 0;
144    
145      if(val->type==list) {
146        iterator= val->content.ptr;
147    
148        while(iterator!=NULL) {
149          gc_mark(iterator->item);
150          iterator= iterator->next;
151        }
152      }
153    }
154    
155    inline void gc_maybe(environment *env)
156    {
157      if(env->gc_count < env->gc_limit)
158        return;
159      else
160        return gc_init(env);
161    }
162    
163    /* Start GC */
164    extern void gc_init(environment *env)
165  {  {
166    in_item->next= *stack_head;    stackitem *new_head= NULL, *titem, *iterator;
167    *stack_head= in_item;    symbol *tsymb;
168      int i;
169    
170      /* Mark values on stack */
171      iterator= env->head;
172      while(iterator!=NULL) {
173        gc_mark(iterator->item);
174        iterator= iterator->next;
175      }
176    
177      /* Mark values in hashtable */
178      for(i= 0; i<HASHTBLSIZE; i++) {
179        tsymb= env->symbols[i];
180        while(tsymb!=NULL) {
181          if (tsymb->val != NULL)
182            gc_mark(tsymb->val);
183          tsymb= tsymb->next;
184        }
185      }
186    
187      env->gc_count= 0;
188    
189      while(env->gc_ref!=NULL) {    /* Sweep unused values */
190    
191        if(env->gc_ref->item->gc_garb
192           && !(env->gc_ref->item->gc_protect)) {
193    
194          switch(env->gc_ref->item->type) { /* Remove content */
195          case string:
196            free(env->gc_ref->item->content.ptr);
197            break;
198          case list:
199            while(env->gc_ref->item->content.ptr!=NULL) {
200              titem= env->gc_ref->item->content.ptr;
201              env->gc_ref->item->content.ptr= titem->next;
202              free(titem);
203            }
204          default:
205          }
206          free(env->gc_ref->item);  /* Remove from gc_ref */
207          titem= env->gc_ref->next;
208          free(env->gc_ref);        /* Remove value */
209          env->gc_ref= titem;
210          continue;
211        }
212        
213        /* Keep values */
214        titem= env->gc_ref->next;
215        env->gc_ref->next= new_head;
216        new_head= env->gc_ref;
217        new_head->item->gc_garb= 1;
218        env->gc_ref= titem;
219        env->gc_count++;
220      }
221    
222      env->gc_limit= env->gc_count*2;
223      env->gc_ref= new_head;
224    }
225    
226    /* Protect values from GC */
227    void protect(value *val)
228    {
229      stackitem *iterator;
230    
231      if(val->gc_protect)
232        return;
233    
234      val->gc_protect= 1;
235    
236      if(val->type==list) {
237        iterator= val->content.ptr;
238    
239        while(iterator!=NULL) {
240          protect(iterator->item);
241          iterator= iterator->next;
242        }
243      }
244    }
245    
246    /* Unprotect values from GC */
247    void unprotect(value *val)
248    {
249      stackitem *iterator;
250    
251      if(!(val->gc_protect))
252        return;
253    
254      val->gc_protect= 0;
255    
256      if(val->type==list) {
257        iterator= val->content.ptr;
258    
259        while(iterator!=NULL) {
260          unprotect(iterator->item);
261          iterator= iterator->next;
262        }
263      }
264  }  }
265    
266  /* Push a value onto the stack */  /* Push a value onto the stack */
267  void push_val(stackitem **stack_head, value *val)  void push_val(environment *env, value *val)
268  {  {
269    stackitem *new_item= malloc(sizeof(stackitem));    stackitem *new_item= malloc(sizeof(stackitem));
270    new_item->item= val;    new_item->item= val;
271    val->refcount++;    new_item->next= env->head;
272    push(stack_head, new_item);    env->head= new_item;
273  }  }
274    
275  /* Push an integer onto the stack. */  /* Push an integer onto the stack */
276  void push_int(stackitem **stack_head, int in_val)  void push_int(environment *env, int in_val)
277  {  {
278    value *new_value= malloc(sizeof(value));    value *new_value= new_val(env);
   stackitem *new_item= malloc(sizeof(stackitem));  
   new_item->item= new_value;  
279        
280    new_value->content.val= in_val;    new_value->content.i= in_val;
281    new_value->type= integer;    new_value->type= integer;
   new_value->refcount=1;  
282    
283    push(stack_head, new_item);    push_val(env, new_value);
284    }
285    
286    /* Push a floating point number onto the stack */
287    void push_float(environment *env, float in_val)
288    {
289      value *new_value= new_val(env);
290    
291      new_value->content.f= in_val;
292      new_value->type= tfloat;
293    
294      push_val(env, new_value);
295  }  }
296    
297  /* Copy a string onto the stack. */  /* Copy a string onto the stack. */
298  void push_cstring(stackitem **stack_head, const char *in_string)  void push_cstring(environment *env, const char *in_string)
299  {  {
300    value *new_value= malloc(sizeof(value));    value *new_value= new_val(env);
   stackitem *new_item= malloc(sizeof(stackitem));  
   new_item->item=new_value;  
301    
302    new_value->content.ptr= malloc(strlen(in_string)+1);    new_value->content.ptr= malloc(strlen(in_string)+1);
303    strcpy(new_value->content.ptr, in_string);    strcpy(new_value->content.ptr, in_string);
304    new_value->type= string;    new_value->type= string;
   new_value->refcount=1;  
305    
306    push(stack_head, new_item);    push_val(env, new_value);
307  }  }
308    
309  /* Mangle a symbol name to a valid C identifier name */  /* Mangle a symbol name to a valid C identifier name */
310  char *mangle_str(const char *old_string){  char *mangle_str(const char *old_string)
311    char validchars[]  {
312      ="0123456789abcdef";    char validchars[]= "0123456789abcdef";
313    char *new_string, *current;    char *new_string, *current;
314    
315    new_string=malloc((strlen(old_string)*2)+4);    new_string= malloc((strlen(old_string)*2)+4);
316    strcpy(new_string, "sx_");    /* Stack eXternal */    strcpy(new_string, "sx_");    /* Stack eXternal */
317    current=new_string+3;    current= new_string+3;
318    while(old_string[0] != '\0'){    while(old_string[0] != '\0'){
319      current[0]=validchars[(unsigned char)(old_string[0])/16];      current[0]= validchars[(unsigned char)(old_string[0])/16];
320      current[1]=validchars[(unsigned char)(old_string[0])%16];      current[1]= validchars[(unsigned char)(old_string[0])%16];
321      current+=2;      current+= 2;
322      old_string++;      old_string++;
323    }    }
324    current[0]='\0';    current[0]= '\0';
325    
326    return new_string;            /* The caller must free() it */    return new_string;            /* The caller must free() it */
327  }  }
328    
329  extern void mangle(environment *env){  extern void mangle(environment *env)
330    value *new_value;  {
331    char *new_string;    char *new_string;
332    
333    if((env->head)==NULL) {    if((env->head)==NULL) {
334      printerr("Too Few Arguments");      printerr("Too Few Arguments");
335      env->err=1;      env->err= 1;
336      return;      return;
337    }    }
338    
339    if(env->head->item->type!=string) {    if(env->head->item->type!=string) {
340      printerr("Bad Argument Type");      printerr("Bad Argument Type");
341      env->err=2;      env->err= 2;
342      return;      return;
343    }    }
344    
# Line 239  extern void mangle(environment *env){ Line 347  extern void mangle(environment *env){
347    toss(env);    toss(env);
348    if(env->err) return;    if(env->err) return;
349    
350    new_value= malloc(sizeof(value));    push_cstring(env, new_string);
   new_value->content.ptr= new_string;  
   new_value->type= string;  
   new_value->refcount=1;  
   
   push_val(&(env->head), new_value);  
351  }  }
352    
353  /* Push a symbol onto the stack. */  /* Push a symbol onto the stack. */
354  void push_sym(environment *env, const char *in_string)  void push_sym(environment *env, const char *in_string)
355  {  {
   stackitem *new_item;          /* The new stack item */  
   /* ...which will contain... */  
356    value *new_value;             /* A new symbol value */    value *new_value;             /* A new symbol value */
357    /* ...which might point to... */    /* ...which might point to... */
358    symbol **new_symbol;          /* (if needed) A new actual symbol */    symbol **new_symbol;          /* (if needed) A new actual symbol */
# Line 264  void push_sym(environment *env, const ch Line 365  void push_sym(environment *env, const ch
365    const char *dlerr;            /* Dynamic linker error */    const char *dlerr;            /* Dynamic linker error */
366    char *mangled;                /* Mangled function name */    char *mangled;                /* Mangled function name */
367    
368    /* Create a new stack item containing a new value */    new_value= new_val(env);
369    new_item= malloc(sizeof(stackitem));    protect(new_value);
370    new_value= malloc(sizeof(value));    new_fvalue= new_val(env);
371    new_item->item=new_value;    protect(new_fvalue);
372    
373    /* The new value is a symbol */    /* The new value is a symbol */
374    new_value->type= symb;    new_value->type= symb;
   new_value->refcount= 1;  
375    
376    /* Look up the symbol name in the hash table */    /* Look up the symbol name in the hash table */
377    new_symbol= hash(env->symbols, in_string);    new_symbol= hash(env->symbols, in_string);
# Line 294  void push_sym(environment *env, const ch Line 394  void push_sym(environment *env, const ch
394      if(handle==NULL)            /* If no handle */      if(handle==NULL)            /* If no handle */
395        handle= dlopen(NULL, RTLD_LAZY);        handle= dlopen(NULL, RTLD_LAZY);
396    
397      funcptr= dlsym(handle, in_string); /* Get function pointer */      mangled= mangle_str(in_string); /* mangle the name */
398      dlerr=dlerror();      funcptr= dlsym(handle, mangled); /* and try to find it */
399    
400        dlerr= dlerror();
401      if(dlerr != NULL) {         /* If no function was found */      if(dlerr != NULL) {         /* If no function was found */
402        mangled=mangle_str(in_string);        funcptr= dlsym(handle, in_string); /* Get function pointer */
403        funcptr= dlsym(handle, mangled); /* try mangling it */        dlerr= dlerror();
       free(mangled);  
       dlerr=dlerror();  
404      }      }
405    
406      if(dlerr==NULL) {           /* If a function was found */      if(dlerr==NULL) {           /* If a function was found */
407        new_fvalue= malloc(sizeof(value)); /* Create a new value */        new_fvalue->type= func;   /* The new value is a function pointer */
408        new_fvalue->type=func;    /* The new value is a function pointer */        new_fvalue->content.ptr= funcptr; /* Store function pointer */
       new_fvalue->content.ptr=funcptr; /* Store function pointer */  
409        (*new_symbol)->val= new_fvalue; /* Bind the symbol to the new        (*new_symbol)->val= new_fvalue; /* Bind the symbol to the new
410                                           function value */                                           function value */
       new_fvalue->refcount= 1;  
411      }      }
412    
413        free(mangled);
414    }    }
415    push(&(env->head), new_item);  
416      push_val(env, new_value);
417      unprotect(new_value); unprotect(new_fvalue);
418  }  }
419    
420  /* Print newline. */  /* Print newline. */
# Line 321  extern void nl() Line 424  extern void nl()
424  }  }
425    
426  /* Gets the type of a value */  /* Gets the type of a value */
427  extern void type(environment *env){  extern void type(environment *env)
428    {
429    int typenum;    int typenum;
430    
431    if((env->head)==NULL) {    if((env->head)==NULL) {
# Line 335  extern void type(environment *env){ Line 439  extern void type(environment *env){
439    case integer:    case integer:
440      push_sym(env, "integer");      push_sym(env, "integer");
441      break;      break;
442      case tfloat:
443        push_sym(env, "float");
444        break;
445    case string:    case string:
446      push_sym(env, "string");      push_sym(env, "string");
447      break;      break;
# Line 347  extern void type(environment *env){ Line 454  extern void type(environment *env){
454    case list:    case list:
455      push_sym(env, "list");      push_sym(env, "list");
456      break;      break;
   default:  
     push_sym(env, "unknown");  
     break;  
457    }    }
458  }      }    
459    
460  /* Prints the top element of the stack. */  /* Prints the top element of the stack. */
461  void print_h(stackitem *stack_head)  void print_h(stackitem *stack_head, int noquote)
462  {  {
463    switch(stack_head->item->type) {    switch(stack_head->item->type) {
464    case integer:    case integer:
465      printf("%d", stack_head->item->content.val);      printf("%d", stack_head->item->content.i);
466        break;
467      case tfloat:
468        printf("%f", stack_head->item->content.f);
469      break;      break;
470    case string:    case string:
471      printf("%s", (char*)stack_head->item->content.ptr);      if(noquote)
472          printf("%s", (char*)stack_head->item->content.ptr);
473        else
474          printf("\"%s\"", (char*)stack_head->item->content.ptr);
475      break;      break;
476    case symb:    case symb:
477      printf("%s", ((symbol *)(stack_head->item->content.ptr))->id);      printf("%s", ((symbol *)(stack_head->item->content.ptr))->id);
# Line 374  void print_h(stackitem *stack_head) Line 484  void print_h(stackitem *stack_head)
484      stack_head=(stackitem *)(stack_head->item->content.ptr);      stack_head=(stackitem *)(stack_head->item->content.ptr);
485      printf("[ ");      printf("[ ");
486      while(stack_head != NULL) {      while(stack_head != NULL) {
487        print_h(stack_head);        print_h(stack_head, noquote);
488        printf(" ");        printf(" ");
489        stack_head=stack_head->next;        stack_head=stack_head->next;
490      }      }
491      printf("]");      printf("]");
492      break;      break;
   default:  
     printf("#<unknown %p>", (stack_head->item->content.ptr));  
     break;  
493    }    }
494  }  }
495    
496  extern void print_(environment *env) {  extern void print_(environment *env)
497    {
498    if(env->head==NULL) {    if(env->head==NULL) {
499      printerr("Too Few Arguments");      printerr("Too Few Arguments");
500      env->err=1;      env->err=1;
501      return;      return;
502    }    }
503    print_h(env->head);    print_h(env->head, 0);
504      nl();
505  }  }
506    
507  /* Prints the top element of the stack and then discards it. */  /* Prints the top element of the stack and then discards it. */
# Line 403  extern void print(environment *env) Line 512  extern void print(environment *env)
512    toss(env);    toss(env);
513  }  }
514    
515    extern void princ_(environment *env)
516    {
517      if(env->head==NULL) {
518        printerr("Too Few Arguments");
519        env->err=1;
520        return;
521      }
522      print_h(env->head, 1);
523    }
524    
525    /* Prints the top element of the stack and then discards it. */
526    extern void princ(environment *env)
527    {
528      princ_(env);
529      if(env->err) return;
530      toss(env);
531    }
532    
533  /* Only to be called by function printstack. */  /* Only to be called by function printstack. */
534  void print_st(stackitem *stack_head, long counter)  void print_st(stackitem *stack_head, long counter)
535  {  {
536    if(stack_head->next != NULL)    if(stack_head->next != NULL)
537      print_st(stack_head->next, counter+1);      print_st(stack_head->next, counter+1);
538    printf("%ld: ", counter);    printf("%ld: ", counter);
539    print_h(stack_head);    print_h(stack_head, 0);
540    nl();    nl();
541  }  }
542    
# Line 417  void print_st(stackitem *stack_head, lon Line 544  void print_st(stackitem *stack_head, lon
544  extern void printstack(environment *env)  extern void printstack(environment *env)
545  {  {
546    if(env->head == NULL) {    if(env->head == NULL) {
547        printf("Stack Empty\n");
548      return;      return;
549    }    }
550    
551    print_st(env->head, 1);    print_st(env->head, 1);
   nl();  
552  }  }
553    
554  /* Swap the two top elements on the stack. */  /* Swap the two top elements on the stack. */
# Line 479  extern void rcl(environment *env) Line 607  extern void rcl(environment *env)
607      env->err=3;      env->err=3;
608      return;      return;
609    }    }
610      protect(val);
611    toss(env);            /* toss the symbol */    toss(env);            /* toss the symbol */
612    if(env->err) return;    if(env->err) return;
613    push_val(&(env->head), val); /* Return its bound value */    push_val(env, val); /* Return its bound value */
614      unprotect(val);
615  }  }
616    
 void stack_read(environment*, char*);  
   
617  /* 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
618     function value, and if it is, toss the symbol and execute the     function value, and if it is, toss the symbol and execute the
619     function. */     function. */
# Line 494  extern void eval(environment *env) Line 622  extern void eval(environment *env)
622    funcp in_func;    funcp in_func;
623    value* temp_val;    value* temp_val;
624    stackitem* iterator;    stackitem* iterator;
625    char* temp_string;  
626     eval_start:
627    
628      gc_maybe(env);
629    
630    if(env->head==NULL) {    if(env->head==NULL) {
631      printerr("Too Few Arguments");      printerr("Too Few Arguments");
# Line 508  extern void eval(environment *env) Line 639  extern void eval(environment *env)
639      rcl(env);                   /* get its contents */      rcl(env);                   /* get its contents */
640      if(env->err) return;      if(env->err) return;
641      if(env->head->item->type!=symb){ /* don't recurse symbols */      if(env->head->item->type!=symb){ /* don't recurse symbols */
642        eval(env);                        /* evaluate the value */        goto eval_start;
       return;  
643      }      }
644      break;      return;
645    
646      /* If it's a lone function value, run it */      /* If it's a lone function value, run it */
647    case func:    case func:
648      in_func= (funcp)(env->head->item->content.ptr);      in_func= (funcp)(env->head->item->content.ptr);
649      toss(env);      toss(env);
650      if(env->err) return;      if(env->err) return;
651      (*in_func)(env);      return in_func(env);
     break;  
652    
653      /* If it's a list */      /* If it's a list */
654    case list:    case list:
655      temp_val= env->head->item;      temp_val= env->head->item;
656      env->head->item->refcount++;      protect(temp_val);
657      toss(env);  
658      if(env->err) return;      toss(env); if(env->err) return;
659      iterator= (stackitem*)temp_val->content.ptr;      iterator= (stackitem*)temp_val->content.ptr;
660      while(iterator!=NULL && iterator->item!=NULL) {      
661        push_val(&(env->head), iterator->item);      while(iterator!=NULL) {
662          push_val(env, iterator->item);
663          
664        if(env->head->item->type==symb        if(env->head->item->type==symb
665          && strcmp(";", ((symbol*)(env->head->item->content.ptr))->id)==0) {          && strcmp(";", ((symbol*)(env->head->item->content.ptr))->id)==0) {
666          toss(env);          toss(env);
667          if(env->err) return;          if(env->err) return;
668            
669            if(iterator->next == NULL){
670              goto eval_start;
671            }
672          eval(env);          eval(env);
673          if(env->err) return;          if(env->err) return;
674        }        }
675        iterator= iterator->next;        iterator= iterator->next;
676      }      }
677      free_val(temp_val);      unprotect(temp_val);
678      break;      return;
   
     /* If it's a string */  
   case string:  
     temp_val= env->head->item;  
     env->head->item->refcount++;  
     toss(env);  
     if(env->err) return;  
     temp_string= malloc(strlen((char*)temp_val->content.ptr)+5);  
     strcpy(temp_string, "[ ");  
     strcat(temp_string, (char*)temp_val->content.ptr);  
     strcat(temp_string, " ]");  
     stack_read(env, temp_string);  
     eval(env);  
     if(env->err) return;  
     free_val(temp_val);  
     free(temp_string);  
     break;  
679    
680    case integer:    default:
681      break;      return;
682    }    }
683  }  }
684    
685  /* Reverse (flip) a list */  /* Reverse (flip) a list */
686  extern void rev(environment *env){  extern void rev(environment *env)
687    {
688    stackitem *old_head, *new_head, *item;    stackitem *old_head, *new_head, *item;
689    
690    if((env->head)==NULL) {    if((env->head)==NULL) {
691      printerr("Too Few Arguments");      printerr("Too Few Arguments");
692      env->err=1;      env->err= 1;
693      return;      return;
694    }    }
695    
696    if(env->head->item->type!=list) {    if(env->head->item->type!=list) {
697      printerr("Bad Argument Type");      printerr("Bad Argument Type");
698      env->err=2;      env->err= 2;
699      return;      return;
700    }    }
701    
702    old_head=(stackitem *)(env->head->item->content.ptr);    old_head= (stackitem *)(env->head->item->content.ptr);
703    new_head=NULL;    new_head= NULL;
704    while(old_head != NULL){    while(old_head != NULL){
705      item=old_head;      item= old_head;
706      old_head=old_head->next;      old_head= old_head->next;
707      item->next=new_head;      item->next= new_head;
708      new_head=item;      new_head= item;
709    }    }
710    env->head->item->content.ptr=new_head;    env->head->item->content.ptr= new_head;
711  }  }
712    
713  /* Make a list. */  /* Make a list. */
714  extern void pack(environment *env)  extern void pack(environment *env)
715  {  {
   void* delimiter;  
716    stackitem *iterator, *temp;    stackitem *iterator, *temp;
717    value *pack;    value *pack;
718    
   delimiter= env->head->item->content.ptr; /* Get delimiter */  
   toss(env);  
   
719    iterator= env->head;    iterator= env->head;
720      pack= new_val(env);
721      protect(pack);
722    
723    if(iterator==NULL || iterator->item->content.ptr==delimiter) {    if(iterator==NULL
724         || (iterator->item->type==symb
725         && ((symbol*)(iterator->item->content.ptr))->id[0]=='[')) {
726      temp= NULL;      temp= NULL;
727      toss(env);      toss(env);
728    } else {    } else {
729      /* Search for first delimiter */      /* Search for first delimiter */
730      while(iterator->next!=NULL      while(iterator->next!=NULL
731            && iterator->next->item->content.ptr!=delimiter)            && (iterator->next->item->type!=symb
732              || ((symbol*)(iterator->next->item->content.ptr))->id[0]!='['))
733        iterator= iterator->next;        iterator= iterator->next;
734            
735      /* Extract list */      /* Extract list */
736      temp= env->head;      temp= env->head;
737      env->head= iterator->next;      env->head= iterator->next;
738      iterator->next= NULL;      iterator->next= NULL;
739    
740        pack->type= list;
741        pack->content.ptr= temp;
742            
743      if(env->head!=NULL)      if(env->head!=NULL)
744        toss(env);        toss(env);
745    }    }
746    
747    /* Push list */    /* Push list */
   pack= malloc(sizeof(value));  
   pack->type= list;  
   pack->content.ptr= temp;  
   pack->refcount= 1;  
748    
749    temp= malloc(sizeof(stackitem));    push_val(env, pack);
   temp->item= pack;  
   
   push(&(env->head), temp);  
750    rev(env);    rev(env);
 }  
   
 /* Parse input. */  
 void stack_read(environment *env, char *in_line)  
 {  
   char *temp, *rest;  
   int itemp;  
   size_t inlength= strlen(in_line)+1;  
   int convert= 0;  
   
   temp= malloc(inlength);  
   rest= malloc(inlength);  
   
   do {  
     /* If comment */  
     if((convert= sscanf(in_line, "#%[^\n\r]", rest))) {  
       free(temp); free(rest);  
       return;  
     }  
   
     /* If string */  
     if((convert= sscanf(in_line, "\"%[^\"\n\r]\" %[^\n\r]", temp, rest))) {  
       push_cstring(&(env->head), temp);  
       break;  
     }  
     /* If integer */  
     if((convert= sscanf(in_line, "%d %[^\n\r]", &itemp, rest))) {  
       push_int(&(env->head), itemp);  
       break;  
     }  
     /* Escape ';' with '\' */  
     if((convert= sscanf(in_line, "\\%c%[^\n\r]", temp, rest))) {  
       temp[1]= '\0';  
       push_sym(env, temp);  
       break;  
     }  
     /* If symbol */  
     if((convert= sscanf(in_line, "%[^][ ;\n\r]%[^\n\r]", temp, rest))) {  
         push_sym(env, temp);  
         break;  
     }  
     /* If single char */  
     if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest))) {  
       if(*temp==';') {  
         if(!env->non_eval_flag) {  
           eval(env);            /* Evaluate top element */  
           break;  
         }  
           
         push_sym(env, ";");  
         break;  
       }  
   
       if(*temp==']') {  
         push_sym(env, "[");  
         pack(env);  
         if(env->non_eval_flag)  
           env->non_eval_flag--;  
         break;  
       }  
   
       if(*temp=='[') {  
         push_sym(env, "[");  
         env->non_eval_flag++;  
         break;  
       }  
     }  
   } while(0);  
   
   free(temp);  
751    
752    if(convert<2) {    unprotect(pack);
     free(rest);  
     return;  
   }  
     
   stack_read(env, rest);  
     
   free(rest);  
753  }  }
754    
755  /* Relocate elements of the list on the stack. */  /* Relocate elements of the list on the stack. */
# Line 721  extern void expand(environment *env) Line 760  extern void expand(environment *env)
760    /* Is top element a list? */    /* Is top element a list? */
761    if(env->head==NULL) {    if(env->head==NULL) {
762      printerr("Too Few Arguments");      printerr("Too Few Arguments");
763      env->err=1;      env->err= 1;
764      return;      return;
765    }    }
766    if(env->head->item->type!=list) {    if(env->head->item->type!=list) {
767      printerr("Bad Argument Type");      printerr("Bad Argument Type");
768      env->err=2;      env->err= 2;
769      return;      return;
770    }    }
771    
# Line 738  extern void expand(environment *env) Line 777  extern void expand(environment *env)
777    /* The first list element is the new stack head */    /* The first list element is the new stack head */
778    new_head= temp= env->head->item->content.ptr;    new_head= temp= env->head->item->content.ptr;
779    
   env->head->item->refcount++;  
780    toss(env);    toss(env);
781    
782    /* Find the end of the list */    /* Find the end of the list */
# Line 759  extern void eq(environment *env) Line 797  extern void eq(environment *env)
797    
798    if((env->head)==NULL || env->head->next==NULL) {    if((env->head)==NULL || env->head->next==NULL) {
799      printerr("Too Few Arguments");      printerr("Too Few Arguments");
800      env->err=1;      env->err= 1;
801      return;      return;
802    }    }
803    
# Line 769  extern void eq(environment *env) Line 807  extern void eq(environment *env)
807    result= (left==right);    result= (left==right);
808        
809    toss(env); toss(env);    toss(env); toss(env);
810    push_int(&(env->head), result);    push_int(env, result);
811  }  }
812    
813  /* Negates the top element on the stack. */  /* Negates the top element on the stack. */
# Line 779  extern void not(environment *env) Line 817  extern void not(environment *env)
817    
818    if((env->head)==NULL) {    if((env->head)==NULL) {
819      printerr("Too Few Arguments");      printerr("Too Few Arguments");
820      env->err=1;      env->err= 1;
821      return;      return;
822    }    }
823    
824    if(env->head->item->type!=integer) {    if(env->head->item->type!=integer) {
825      printerr("Bad Argument Type");      printerr("Bad Argument Type");
826      env->err=2;      env->err= 2;
827      return;      return;
828    }    }
829    
830    val= env->head->item->content.val;    val= env->head->item->content.i;
831    toss(env);    toss(env);
832    push_int(&(env->head), !val);    push_int(env, !val);
833  }  }
834    
835  /* Compares the two top elements on the stack and return 0 if they're the  /* Compares the two top elements on the stack and return 0 if they're the
# Line 810  extern void def(environment *env) Line 848  extern void def(environment *env)
848    /* Needs two values on the stack, the top one must be a symbol */    /* Needs two values on the stack, the top one must be a symbol */
849    if(env->head==NULL || env->head->next==NULL) {    if(env->head==NULL || env->head->next==NULL) {
850      printerr("Too Few Arguments");      printerr("Too Few Arguments");
851      env->err=1;      env->err= 1;
852      return;      return;
853    }    }
854    
855    if(env->head->item->type!=symb) {    if(env->head->item->type!=symb) {
856      printerr("Bad Argument Type");      printerr("Bad Argument Type");
857      env->err=2;      env->err= 2;
858      return;      return;
859    }    }
860    
861    /* long names are a pain */    /* long names are a pain */
862    sym=env->head->item->content.ptr;    sym= env->head->item->content.ptr;
   
   /* if the symbol was bound to something else, throw it away */  
   if(sym->val != NULL)  
     free_val(sym->val);  
863    
864    /* Bind the symbol to the value */    /* Bind the symbol to the value */
865    sym->val= env->head->next->item;    sym->val= env->head->next->item;
   sym->val->refcount++;         /* Increase the reference counter */  
866    
867    toss(env); toss(env);    toss(env); toss(env);
868  }  }
# Line 837  extern void def(environment *env) Line 870  extern void def(environment *env)
870  /* Quit stack. */  /* Quit stack. */
871  extern void quit(environment *env)  extern void quit(environment *env)
872  {  {
873      int i;
874    
875      clear(env);
876    
877      if (env->err) return;
878      for(i= 0; i<HASHTBLSIZE; i++) {
879        while(env->symbols[i]!= NULL) {
880          forget_sym(&(env->symbols[i]));
881        }
882        env->symbols[i]= NULL;
883      }
884    
885      env->gc_limit= 0;
886      gc_maybe(env);
887    
888      if(env->free_string!=NULL)
889        free(env->free_string);
890      
891      muntrace();
892    
893    exit(EXIT_SUCCESS);    exit(EXIT_SUCCESS);
894  }  }
895    
# Line 862  extern void words(environment *env) Line 915  extern void words(environment *env)
915    }    }
916  }  }
917    
918    /* Internal forget function */
919    void forget_sym(symbol **hash_entry)
920    {
921      symbol *temp;
922    
923      temp= *hash_entry;
924      *hash_entry= (*hash_entry)->next;
925      
926      free(temp->id);
927      free(temp);
928    }
929    
930  /* Forgets a symbol (remove it from the hash table) */  /* Forgets a symbol (remove it from the hash table) */
931  extern void forget(environment *env)  extern void forget(environment *env)
932  {  {
933    char* sym_id;    char* sym_id;
934    stackitem *stack_head= env->head;    stackitem *stack_head= env->head;
   symbol **hash_entry, *temp;  
935    
936    if(stack_head==NULL) {    if(stack_head==NULL) {
937      printerr("Too Few Arguments");      printerr("Too Few Arguments");
# Line 884  extern void forget(environment *env) Line 948  extern void forget(environment *env)
948    sym_id= ((symbol*)(stack_head->item->content.ptr))->id;    sym_id= ((symbol*)(stack_head->item->content.ptr))->id;
949    toss(env);    toss(env);
950    
951    hash_entry= hash(env->symbols, sym_id);    return forget_sym(hash(env->symbols, sym_id));
   temp= *hash_entry;  
   *hash_entry= (*hash_entry)->next;  
     
   if(temp->val!=NULL) {  
     free_val(temp->val);  
   }  
   free(temp->id);  
   free(temp);  
952  }  }
953    
954  /* Returns the current error number to the stack */  /* Returns the current error number to the stack */
955  extern void errn(environment *env){  extern void errn(environment *env)
956    push_int(&(env->head), env->err);  {
957      push_int(env, env->err);
958  }  }
959    
960  int main()  int main(int argc, char **argv)
961  {  {
962    environment myenv;    environment myenv;
963    char in_string[100];  
964      int c;                        /* getopt option character */
965    
966      mtrace();
967    
968    init_env(&myenv);    init_env(&myenv);
969    
970    printf("okidok\n ");    myenv.interactive = isatty(STDIN_FILENO) && isatty(STDOUT_FILENO);
971    
972      while ((c = getopt (argc, argv, "i")) != -1)
973        switch (c)
974          {
975          case 'i':
976            myenv.interactive = 1;
977            break;
978          case '?':
979            fprintf (stderr,
980                     "Unknown option character `\\x%x'.\n",
981                     optopt);
982            return EX_USAGE;
983          default:
984            abort ();
985          }
986      
987      if (optind < argc) {
988        myenv.interactive = 0;
989        myenv.inputstream= fopen(argv[optind], "r");
990        if(myenv.inputstream== NULL) {
991          perror(argv[0]);
992          exit (EX_NOINPUT);
993        }
994      }
995    
996      if(myenv.interactive) {
997        printf("Stack version $Revision$\n\
998    Copyright (C) 2002  Mats Alritzson and Teddy Hogeborn\n\
999    Stack comes with ABSOLUTELY NO WARRANTY; for details type `warranty;'.\n\
1000    This is free software, and you are welcome to redistribute it\n\
1001    under certain conditions; type `copying;' for details.\n");
1002      }
1003    
1004    while(fgets(in_string, 100, stdin) != NULL) {    while(1) {
1005      stack_read(&myenv, in_string);      if(myenv.in_string==NULL) {
1006      if(myenv.err) {        if (myenv.interactive) {
1007        printf("(error %d) ", myenv.err);          if(myenv.err) {
1008              printf("(error %d)\n", myenv.err);
1009            }
1010            nl();
1011            printstack(&myenv);
1012            printf("> ");
1013          }
1014        myenv.err=0;        myenv.err=0;
1015      }      }
1016      printf("okidok\n ");      sx_72656164(&myenv);
1017        if (myenv.err==4) {
1018          return EXIT_SUCCESS;      /* EOF */
1019        } else if(myenv.head!=NULL
1020                  && myenv.head->item->type==symb
1021                  && ((symbol*)(myenv.head->item->content.ptr))->id[0]==';') {
1022          toss(&myenv);             /* No error check in main */
1023          eval(&myenv);
1024        }
1025        gc_maybe(&myenv);
1026    }    }
1027    quit(&myenv);    quit(&myenv);
1028    return EXIT_FAILURE;    return EXIT_FAILURE;
1029  }  }
1030    
1031  /* + */  /* "+" */
1032  extern void sx_2b(environment *env) {  extern void sx_2b(environment *env)
1033    {
1034    int a, b;    int a, b;
1035      float fa, fb;
1036    size_t len;    size_t len;
1037    char* new_string;    char* new_string;
1038    value *a_val, *b_val;    value *a_val, *b_val;
1039    
1040    if((env->head)==NULL || env->head->next==NULL) {    if((env->head)==NULL || env->head->next==NULL) {
1041      printerr("Too Few Arguments");      printerr("Too Few Arguments");
1042      env->err=1;      env->err= 1;
1043      return;      return;
1044    }    }
1045    
# Line 938  extern void sx_2b(environment *env) { Line 1047  extern void sx_2b(environment *env) {
1047       && env->head->next->item->type==string) {       && env->head->next->item->type==string) {
1048      a_val= env->head->item;      a_val= env->head->item;
1049      b_val= env->head->next->item;      b_val= env->head->next->item;
1050      a_val->refcount++;      protect(a_val); protect(b_val);
     b_val->refcount++;  
1051      toss(env); if(env->err) return;      toss(env); if(env->err) return;
1052      toss(env); if(env->err) return;      toss(env); if(env->err) return;
1053      len= strlen(a_val->content.ptr)+strlen(b_val->content.ptr)+1;      len= strlen(a_val->content.ptr)+strlen(b_val->content.ptr)+1;
1054      new_string= malloc(len);      new_string= malloc(len);
1055      strcpy(new_string, b_val->content.ptr);      strcpy(new_string, b_val->content.ptr);
1056      strcat(new_string, a_val->content.ptr);      strcat(new_string, a_val->content.ptr);
1057      free_val(a_val); free_val(b_val);      push_cstring(env, new_string);
1058      push_cstring(&(env->head), new_string);      unprotect(a_val); unprotect(b_val);
1059      free(new_string);      free(new_string);
1060        
1061      return;      return;
1062    }    }
1063        
1064    if(env->head->item->type!=integer    if(env->head->item->type==integer
1065       || env->head->next->item->type!=integer) {       && env->head->next->item->type==integer) {
1066      printerr("Bad Argument Type");      a=env->head->item->content.i;
1067      env->err=2;      toss(env); if(env->err) return;
1068        b=env->head->item->content.i;
1069        toss(env); if(env->err) return;
1070        push_int(env, b+a);
1071    
1072      return;      return;
1073    }    }
1074    a=env->head->item->content.val;  
1075    toss(env);    if(env->head->item->type==tfloat
1076    if(env->err) return;       && env->head->next->item->type==tfloat) {
1077    b=env->head->item->content.val;      fa= env->head->item->content.f;
1078    toss(env);      toss(env); if(env->err) return;
1079    if(env->err) return;      fb= env->head->item->content.f;
1080    push_int(&(env->head), a+b);      toss(env); if(env->err) return;
1081        push_float(env, fb+fa);
1082        
1083        return;
1084      }
1085    
1086      if(env->head->item->type==tfloat
1087         && env->head->next->item->type==integer) {
1088        fa= env->head->item->content.f;
1089        toss(env); if(env->err) return;
1090        b= env->head->item->content.i;
1091        toss(env); if(env->err) return;
1092        push_float(env, b+fa);
1093        
1094        return;
1095      }
1096    
1097      if(env->head->item->type==integer
1098         && env->head->next->item->type==tfloat) {
1099        a= env->head->item->content.i;
1100        toss(env); if(env->err) return;
1101        fb= env->head->item->content.f;
1102        toss(env); if(env->err) return;
1103        push_float(env, fb+a);
1104    
1105        return;
1106      }
1107    
1108      printerr("Bad Argument Type");
1109      env->err=2;
1110    }
1111    
1112    /* "-" */
1113    extern void sx_2d(environment *env)
1114    {
1115      int a, b;
1116      float fa, fb;
1117    
1118      if((env->head)==NULL || env->head->next==NULL) {
1119        printerr("Too Few Arguments");
1120        env->err=1;
1121        return;
1122      }
1123      
1124      if(env->head->item->type==integer
1125         && env->head->next->item->type==integer) {
1126        a=env->head->item->content.i;
1127        toss(env); if(env->err) return;
1128        b=env->head->item->content.i;
1129        toss(env); if(env->err) return;
1130        push_int(env, b-a);
1131    
1132        return;
1133      }
1134    
1135      if(env->head->item->type==tfloat
1136         && env->head->next->item->type==tfloat) {
1137        fa= env->head->item->content.f;
1138        toss(env); if(env->err) return;
1139        fb= env->head->item->content.f;
1140        toss(env); if(env->err) return;
1141        push_float(env, fb-fa);
1142        
1143        return;
1144      }
1145    
1146      if(env->head->item->type==tfloat
1147         && env->head->next->item->type==integer) {
1148        fa= env->head->item->content.f;
1149        toss(env); if(env->err) return;
1150        b= env->head->item->content.i;
1151        toss(env); if(env->err) return;
1152        push_float(env, b-fa);
1153        
1154        return;
1155      }
1156    
1157      if(env->head->item->type==integer
1158         && env->head->next->item->type==tfloat) {
1159        a= env->head->item->content.i;
1160        toss(env); if(env->err) return;
1161        fb= env->head->item->content.f;
1162        toss(env); if(env->err) return;
1163        push_float(env, fb-a);
1164    
1165        return;
1166      }
1167    
1168      printerr("Bad Argument Type");
1169      env->err=2;
1170    }
1171    
1172    /* ">" */
1173    extern void sx_3e(environment *env)
1174    {
1175      int a, b;
1176      float fa, fb;
1177    
1178      if((env->head)==NULL || env->head->next==NULL) {
1179        printerr("Too Few Arguments");
1180        env->err=1;
1181        return;
1182      }
1183      
1184      if(env->head->item->type==integer
1185         && env->head->next->item->type==integer) {
1186        a=env->head->item->content.i;
1187        toss(env); if(env->err) return;
1188        b=env->head->item->content.i;
1189        toss(env); if(env->err) return;
1190        push_int(env, b>a);
1191    
1192        return;
1193      }
1194    
1195      if(env->head->item->type==tfloat
1196         && env->head->next->item->type==tfloat) {
1197        fa= env->head->item->content.f;
1198        toss(env); if(env->err) return;
1199        fb= env->head->item->content.f;
1200        toss(env); if(env->err) return;
1201        push_int(env, fb>fa);
1202        
1203        return;
1204      }
1205    
1206      if(env->head->item->type==tfloat
1207         && env->head->next->item->type==integer) {
1208        fa= env->head->item->content.f;
1209        toss(env); if(env->err) return;
1210        b= env->head->item->content.i;
1211        toss(env); if(env->err) return;
1212        push_int(env, b>fa);
1213        
1214        return;
1215      }
1216    
1217      if(env->head->item->type==integer
1218         && env->head->next->item->type==tfloat) {
1219        a= env->head->item->content.i;
1220        toss(env); if(env->err) return;
1221        fb= env->head->item->content.f;
1222        toss(env); if(env->err) return;
1223        push_int(env, fb>a);
1224    
1225        return;
1226      }
1227    
1228      printerr("Bad Argument Type");
1229      env->err=2;
1230    }
1231    
1232    /* "<" */
1233    extern void sx_3c(environment *env)
1234    {
1235      swap(env); if(env->err) return;
1236      sx_3e(env);
1237    }
1238    
1239    /* "<=" */
1240    extern void sx_3c3d(environment *env)
1241    {
1242      sx_3e(env); if(env->err) return;
1243      not(env);
1244    }
1245    
1246    /* ">=" */
1247    extern void sx_3e3d(environment *env)
1248    {
1249      sx_3c(env); if(env->err) return;
1250      not(env);
1251  }  }
1252    
1253  /* Return copy of a value */  /* Return copy of a value */
1254  value *copy_val(value *old_value){  value *copy_val(environment *env, value *old_value)
1255    {
1256    stackitem *old_item, *new_item, *prev_item;    stackitem *old_item, *new_item, *prev_item;
1257      value *new_value;
1258    
1259    value *new_value=malloc(sizeof(value));    protect(old_value);
1260      new_value= new_val(env);
1261      protect(new_value);
1262      new_value->type= old_value->type;
1263    
   new_value->type=old_value->type;  
   new_value->refcount=0;        /* This is increased if/when this  
                                    value is referenced somewhere, like  
                                    in a stack item or a variable */  
1264    switch(old_value->type){    switch(old_value->type){
1265      case tfloat:
1266    case integer:    case integer:
     new_value->content.val=old_value->content.val;  
     break;  
   case string:  
     (char *)(new_value->content.ptr)  
       = strdup((char *)(old_value->content.ptr));  
     break;  
1267    case func:    case func:
1268    case symb:    case symb:
1269      new_value->content.ptr=old_value->content.ptr;      new_value->content= old_value->content;
1270        break;
1271      case string:
1272        (char *)(new_value->content.ptr)=
1273          strdup((char *)(old_value->content.ptr));
1274      break;      break;
1275    case list:    case list:
1276      new_value->content.ptr=NULL;      new_value->content.ptr= NULL;
1277    
1278      prev_item=NULL;      prev_item= NULL;
1279      old_item=(stackitem *)(old_value->content.ptr);      old_item= (stackitem*)(old_value->content.ptr);
1280    
1281      while(old_item != NULL) {   /* While list is not empty */      while(old_item != NULL) {   /* While list is not empty */
1282        new_item= malloc(sizeof(stackitem));        new_item= malloc(sizeof(stackitem));
1283        new_item->item=copy_val(old_item->item); /* recurse */        new_item->item= copy_val(env, old_item->item); /* recurse */
1284        new_item->next=NULL;        new_item->next= NULL;
1285        if(prev_item != NULL)     /* If this wasn't the first item */        if(prev_item != NULL)     /* If this wasn't the first item */
1286          prev_item->next=new_item; /* point the previous item to the          prev_item->next= new_item; /* point the previous item to the
1287                                       new item */                                       new item */
1288        else        else
1289          new_value->content.ptr=new_item;          new_value->content.ptr= new_item;
1290        old_item=old_item->next;        old_item= old_item->next;
1291        prev_item=new_item;        prev_item= new_item;
1292      }          }    
1293      break;      break;
1294    }    }
1295    
1296      unprotect(old_value); unprotect(new_value);
1297    
1298    return new_value;    return new_value;
1299  }  }
1300    
1301  /* duplicates an item on the stack */  /* "dup"; duplicates an item on the stack */
1302  extern void dup(environment *env) {  extern void sx_647570(environment *env)
1303    {
1304    if((env->head)==NULL) {    if((env->head)==NULL) {
1305      printerr("Too Few Arguments");      printerr("Too Few Arguments");
1306      env->err=1;      env->err= 1;
1307      return;      return;
1308    }    }
1309    push_val(&(env->head), copy_val(env->head->item));    push_val(env, copy_val(env, env->head->item));
1310  }  }
1311    
1312  /* If-Then */  /* "if", If-Then */
1313  extern void sx_6966(environment *env) {  extern void sx_6966(environment *env)
1314    {
1315    int truth;    int truth;
1316    
1317    if((env->head)==NULL || env->head->next==NULL) {    if((env->head)==NULL || env->head->next==NULL) {
1318      printerr("Too Few Arguments");      printerr("Too Few Arguments");
1319      env->err=1;      env->err= 1;
1320      return;      return;
1321    }    }
1322    
# Line 1042  extern void sx_6966(environment *env) { Line 1329  extern void sx_6966(environment *env) {
1329    swap(env);    swap(env);
1330    if(env->err) return;    if(env->err) return;
1331        
1332    truth=env->head->item->content.val;    truth=env->head->item->content.i;
1333    
1334    toss(env);    toss(env);
1335    if(env->err) return;    if(env->err) return;
# Line 1054  extern void sx_6966(environment *env) { Line 1341  extern void sx_6966(environment *env) {
1341  }  }
1342    
1343  /* If-Then-Else */  /* If-Then-Else */
1344  extern void ifelse(environment *env) {  extern void ifelse(environment *env)
1345    {
1346    int truth;    int truth;
1347    
1348    if((env->head)==NULL || env->head->next==NULL    if((env->head)==NULL || env->head->next==NULL
# Line 1074  extern void ifelse(environment *env) { Line 1361  extern void ifelse(environment *env) {
1361    rot(env);    rot(env);
1362    if(env->err) return;    if(env->err) return;
1363        
1364    truth=env->head->item->content.val;    truth=env->head->item->content.i;
1365    
1366    toss(env);    toss(env);
1367    if(env->err) return;    if(env->err) return;
# Line 1089  extern void ifelse(environment *env) { Line 1376  extern void ifelse(environment *env) {
1376    eval(env);    eval(env);
1377  }  }
1378    
1379  /* while */  /* "while" */
1380  extern void sx_7768696c65(environment *env) {  extern void sx_7768696c65(environment *env)
1381    {
1382    int truth;    int truth;
1383      value *loop, *test;
1384    
1385    if((env->head)==NULL || env->head->next==NULL) {    if((env->head)==NULL || env->head->next==NULL) {
1386      printerr("Too Few Arguments");      printerr("Too Few Arguments");
# Line 1100  extern void sx_7768696c65(environment *e Line 1388  extern void sx_7768696c65(environment *e
1388      return;      return;
1389    }    }
1390    
1391      loop= env->head->item;
1392      protect(loop);
1393      toss(env); if(env->err) return;
1394    
1395      test= env->head->item;
1396      protect(test);
1397      toss(env); if(env->err) return;
1398    
1399    do {    do {
1400      swap(env); if(env->err) return;      push_val(env, test);
1401      dup(env); if(env->err) return;      eval(env);
     eval(env); if(env->err) return;  
1402            
1403      if(env->head->item->type != integer) {      if(env->head->item->type != integer) {
1404        printerr("Bad Argument Type");        printerr("Bad Argument Type");
1405        env->err=2;        env->err= 2;
1406        return;        return;
1407      }      }
1408            
1409      truth= env->head->item->content.val;      truth= env->head->item->content.i;
       
1410      toss(env); if(env->err) return;      toss(env); if(env->err) return;
     swap(env); if(env->err) return;  
1411            
1412      if(truth) {      if(truth) {
1413        dup(env);        push_val(env, loop);
1414        eval(env);        eval(env);
1415      } else {      } else {
1416        toss(env);        toss(env);
       toss(env);  
1417      }      }
1418        
1419    } while(truth);    } while(truth);
1420    
1421      unprotect(loop); unprotect(test);
1422    }
1423    
1424    
1425    /* "for"; for-loop */
1426    extern void sx_666f72(environment *env)
1427    {
1428      value *loop;
1429      int foo1, foo2;
1430    
1431      if(env->head==NULL || env->head->next==NULL
1432         || env->head->next->next==NULL) {
1433        printerr("Too Few Arguments");
1434        env->err= 1;
1435        return;
1436      }
1437    
1438      if(env->head->next->item->type!=integer
1439         || env->head->next->next->item->type!=integer) {
1440        printerr("Bad Argument Type");
1441        env->err= 2;
1442        return;
1443      }
1444    
1445      loop= env->head->item;
1446      protect(loop);
1447      toss(env); if(env->err) return;
1448    
1449      foo2= env->head->item->content.i;
1450      toss(env); if(env->err) return;
1451    
1452      foo1= env->head->item->content.i;
1453      toss(env); if(env->err) return;
1454    
1455      if(foo1<=foo2) {
1456        while(foo1<=foo2) {
1457          push_int(env, foo1);
1458          push_val(env, loop);
1459          eval(env); if(env->err) return;
1460          foo1++;
1461        }
1462      } else {
1463        while(foo1>=foo2) {
1464          push_int(env, foo1);
1465          push_val(env, loop);
1466          eval(env); if(env->err) return;
1467          foo1--;
1468        }
1469      }
1470      unprotect(loop);
1471    }
1472    
1473    /* Variant of for-loop */
1474    extern void foreach(environment *env)
1475    {  
1476      value *loop, *foo;
1477      stackitem *iterator;
1478      
1479      if((env->head)==NULL || env->head->next==NULL) {
1480        printerr("Too Few Arguments");
1481        env->err= 1;
1482        return;
1483      }
1484    
1485      if(env->head->next->item->type != list) {
1486        printerr("Bad Argument Type");
1487        env->err= 2;
1488        return;
1489      }
1490    
1491      loop= env->head->item;
1492      protect(loop);
1493      toss(env); if(env->err) return;
1494    
1495      foo= env->head->item;
1496      protect(foo);
1497      toss(env); if(env->err) return;
1498    
1499      iterator= foo->content.ptr;
1500    
1501      while(iterator!=NULL) {
1502        push_val(env, iterator->item);
1503        push_val(env, loop);
1504        eval(env); if(env->err) return;
1505        iterator= iterator->next;
1506      }
1507      unprotect(loop); unprotect(foo);
1508    }
1509    
1510    /* "to" */
1511    extern void to(environment *env)
1512    {
1513      int ending, start, i;
1514      stackitem *iterator, *temp;
1515      value *pack;
1516    
1517      if((env->head)==NULL || env->head->next==NULL) {
1518        printerr("Too Few Arguments");
1519        env->err=1;
1520        return;
1521      }
1522    
1523      if(env->head->item->type!=integer
1524         || env->head->next->item->type!=integer) {
1525        printerr("Bad Argument Type");
1526        env->err=2;
1527        return;
1528      }
1529    
1530      ending= env->head->item->content.i;
1531      toss(env); if(env->err) return;
1532      start= env->head->item->content.i;
1533      toss(env); if(env->err) return;
1534    
1535      push_sym(env, "[");
1536    
1537      if(ending>=start) {
1538        for(i= ending; i>=start; i--)
1539          push_int(env, i);
1540      } else {
1541        for(i= ending; i<=start; i++)
1542          push_int(env, i);
1543      }
1544    
1545      iterator= env->head;
1546      pack= new_val(env);
1547      protect(pack);
1548    
1549      if(iterator==NULL
1550         || (iterator->item->type==symb
1551         && ((symbol*)(iterator->item->content.ptr))->id[0]=='[')) {
1552        temp= NULL;
1553        toss(env);
1554      } else {
1555        /* Search for first delimiter */
1556        while(iterator->next!=NULL
1557              && (iterator->next->item->type!=symb
1558              || ((symbol*)(iterator->next->item->content.ptr))->id[0]!='['))
1559          iterator= iterator->next;
1560        
1561        /* Extract list */
1562        temp= env->head;
1563        env->head= iterator->next;
1564        iterator->next= NULL;
1565    
1566        pack->type= list;
1567        pack->content.ptr= temp;
1568        
1569        if(env->head!=NULL)
1570          toss(env);
1571      }
1572    
1573      /* Push list */
1574    
1575      push_val(env, pack);
1576    
1577      unprotect(pack);
1578    }
1579    
1580    /* Read a string */
1581    extern void readline(environment *env)
1582    {
1583      char in_string[101];
1584    
1585      if(fgets(in_string, 100, env->inputstream)==NULL)
1586        push_cstring(env, "");
1587      else
1588        push_cstring(env, in_string);
1589    }
1590    
1591    /* "read"; Read a value and place on stack */
1592    extern void sx_72656164(environment *env)
1593    {
1594      const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%n";
1595      const char strform[]= "\"%[^\"]\"%n";
1596      const char intform[]= "%i%n";
1597      const char fltform[]= "%f%n";
1598      const char blankform[]= "%*[ \t]%n";
1599      const char ebrackform[]= "]%n";
1600      const char semicform[]= ";%n";
1601      const char bbrackform[]= "[%n";
1602    
1603      int itemp, readlength= -1;
1604      int count= -1;
1605      float ftemp;
1606      static int depth= 0;
1607      char *match, *ctemp;
1608      size_t inlength;
1609    
1610      if(env->in_string==NULL) {
1611        if(depth > 0 && env->interactive) {
1612          printf("]> ");
1613        }
1614        readline(env); if(env->err) return;
1615    
1616        if(((char *)(env->head->item->content.ptr))[0]=='\0'){
1617          env->err= 4;              /* "" means EOF */
1618          return;
1619        }
1620        
1621        env->in_string= malloc(strlen(env->head->item->content.ptr)+1);
1622        env->free_string= env->in_string; /* Save the original pointer */
1623        strcpy(env->in_string, env->head->item->content.ptr);
1624        toss(env); if(env->err) return;
1625      }
1626      
1627      inlength= strlen(env->in_string)+1;
1628      match= malloc(inlength);
1629    
1630      if(sscanf(env->in_string, blankform, &readlength) != EOF
1631         && readlength != -1) {
1632        ;
1633      } else if(sscanf(env->in_string, fltform, &ftemp, &readlength) != EOF
1634                && readlength != -1) {
1635        if(sscanf(env->in_string, intform, &itemp, &count) != EOF
1636           && count==readlength) {
1637          push_int(env, itemp);
1638        } else {
1639          push_float(env, ftemp);
1640        }
1641      } else if(sscanf(env->in_string, strform, match, &readlength) != EOF
1642                && readlength != -1) {
1643        push_cstring(env, match);
1644      } else if(sscanf(env->in_string, symbform, match, &readlength) != EOF
1645                && readlength != -1) {
1646        push_sym(env, match);
1647      } else if(sscanf(env->in_string, ebrackform, &readlength) != EOF
1648                && readlength != -1) {
1649        pack(env); if(env->err) return;
1650        if(depth != 0) depth--;
1651      } else if(sscanf(env->in_string, semicform, &readlength) != EOF
1652                && readlength != -1) {
1653        push_sym(env, ";");
1654      } else if(sscanf(env->in_string, bbrackform, &readlength) != EOF
1655                && readlength != -1) {
1656        push_sym(env, "[");
1657        depth++;
1658      } else {
1659        free(env->free_string);
1660        env->in_string = env->free_string = NULL;
1661      }
1662      if (env->in_string != NULL) {
1663        env->in_string += readlength;
1664      }
1665    
1666      free(match);
1667    
1668      if(depth)
1669        return sx_72656164(env);
1670    }
1671    
1672    extern void beep(environment *env)
1673    {
1674      int freq, dur, period, ticks;
1675    
1676      if((env->head)==NULL || env->head->next==NULL) {
1677        printerr("Too Few Arguments");
1678        env->err=1;
1679        return;
1680      }
1681    
1682      if(env->head->item->type!=integer
1683         || env->head->next->item->type!=integer) {
1684        printerr("Bad Argument Type");
1685        env->err=2;
1686        return;
1687      }
1688    
1689      dur=env->head->item->content.i;
1690      toss(env);
1691      freq=env->head->item->content.i;
1692      toss(env);
1693    
1694      period=1193180/freq;          /* convert freq from Hz to period
1695                                       length */
1696      ticks=dur*.001193180;         /* convert duration from µseconds to
1697                                       timer ticks */
1698    
1699    /*    ticks=dur/1000; */
1700    
1701      /*  if (ioctl(STDOUT_FILENO, KDMKTONE, (125<<16) + 0x637)==0) */
1702      switch (ioctl(STDOUT_FILENO, KDMKTONE, (ticks<<16) | period)){
1703      case 0:
1704        usleep(dur);
1705        return;
1706      case -1:
1707        perror("beep");
1708        env->err=5;
1709        return;
1710      default:
1711        abort();
1712      }
1713    }
1714    
1715    /* "wait" */
1716    extern void sx_77616974(environment *env)
1717    {
1718      int dur;
1719    
1720      if((env->head)==NULL) {
1721        printerr("Too Few Arguments");
1722        env->err=1;
1723        return;
1724      }
1725    
1726      if(env->head->item->type!=integer) {
1727        printerr("Bad Argument Type");
1728        env->err=2;
1729        return;
1730      }
1731    
1732      dur=env->head->item->content.i;
1733      toss(env);
1734    
1735      usleep(dur);
1736    }
1737    
1738    extern void copying(environment *env)
1739    {
1740      printf("GNU GENERAL PUBLIC LICENSE\n\
1741                           Version 2, June 1991\n\
1742    \n\
1743     Copyright (C) 1989, 1991 Free Software Foundation, Inc.\n\
1744         59 Temple Place, Suite 330, Boston, MA  02111-1307  USA\n\
1745     Everyone is permitted to copy and distribute verbatim copies\n\
1746     of this license document, but changing it is not allowed.\n\
1747    \n\
1748                                Preamble\n\
1749    \n\
1750      The licenses for most software are designed to take away your\n\
1751    freedom to share and change it.  By contrast, the GNU General Public\n\
1752    License is intended to guarantee your freedom to share and change free\n\
1753    software--to make sure the software is free for all its users.  This\n\
1754    General Public License applies to most of the Free Software\n\
1755    Foundation's software and to any other program whose authors commit to\n\
1756    using it.  (Some other Free Software Foundation software is covered by\n\
1757    the GNU Library General Public License instead.)  You can apply it to\n\
1758    your programs, too.\n\
1759    \n\
1760      When we speak of free software, we are referring to freedom, not\n\
1761    price.  Our General Public Licenses are designed to make sure that you\n\
1762    have the freedom to distribute copies of free software (and charge for\n\
1763    this service if you wish), that you receive source code or can get it\n\
1764    if you want it, that you can change the software or use pieces of it\n\
1765    in new free programs; and that you know you can do these things.\n\
1766    \n\
1767      To protect your rights, we need to make restrictions that forbid\n\
1768    anyone to deny you these rights or to ask you to surrender the rights.\n\
1769    These restrictions translate to certain responsibilities for you if you\n\
1770    distribute copies of the software, or if you modify it.\n\
1771    \n\
1772      For example, if you distribute copies of such a program, whether\n\
1773    gratis or for a fee, you must give the recipients all the rights that\n\
1774    you have.  You must make sure that they, too, receive or can get the\n\
1775    source code.  And you must show them these terms so they know their\n\
1776    rights.\n\
1777    \n\
1778      We protect your rights with two steps: (1) copyright the software, and\n\
1779    (2) offer you this license which gives you legal permission to copy,\n\
1780    distribute and/or modify the software.\n\
1781    \n\
1782      Also, for each author's protection and ours, we want to make certain\n\
1783    that everyone understands that there is no warranty for this free\n\
1784    software.  If the software is modified by someone else and passed on, we\n\
1785    want its recipients to know that what they have is not the original, so\n\
1786    that any problems introduced by others will not reflect on the original\n\
1787    authors' reputations.\n\
1788    \n\
1789      Finally, any free program is threatened constantly by software\n\
1790    patents.  We wish to avoid the danger that redistributors of a free\n\
1791    program will individually obtain patent licenses, in effect making the\n\
1792    program proprietary.  To prevent this, we have made it clear that any\n\
1793    patent must be licensed for everyone's free use or not licensed at all.\n\
1794    \n\
1795      The precise terms and conditions for copying, distribution and\n\
1796    modification follow.\n\
1797    \n\
1798                        GNU GENERAL PUBLIC LICENSE\n\
1799       TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION\n\
1800    \n\
1801      0. This License applies to any program or other work which contains\n\
1802    a notice placed by the copyright holder saying it may be distributed\n\
1803    under the terms of this General Public License.  The \"Program\", below,\n\
1804    refers to any such program or work, and a \"work based on the Program\"\n\
1805    means either the Program or any derivative work under copyright law:\n\
1806    that is to say, a work containing the Program or a portion of it,\n\
1807    either verbatim or with modifications and/or translated into another\n\
1808    language.  (Hereinafter, translation is included without limitation in\n\
1809    the term \"modification\".)  Each licensee is addressed as \"you\".\n\
1810    \n\
1811    Activities other than copying, distribution and modification are not\n\
1812    covered by this License; they are outside its scope.  The act of\n\
1813    running the Program is not restricted, and the output from the Program\n\
1814    is covered only if its contents constitute a work based on the\n\
1815    Program (independent of having been made by running the Program).\n\
1816    Whether that is true depends on what the Program does.\n\
1817    \n\
1818      1. You may copy and distribute verbatim copies of the Program's\n\
1819    source code as you receive it, in any medium, provided that you\n\
1820    conspicuously and appropriately publish on each copy an appropriate\n\
1821    copyright notice and disclaimer of warranty; keep intact all the\n\
1822    notices that refer to this License and to the absence of any warranty;\n\
1823    and give any other recipients of the Program a copy of this License\n\
1824    along with the Program.\n\
1825    \n\
1826    You may charge a fee for the physical act of transferring a copy, and\n\
1827    you may at your option offer warranty protection in exchange for a fee.\n\
1828    \n\
1829      2. You may modify your copy or copies of the Program or any portion\n\
1830    of it, thus forming a work based on the Program, and copy and\n\
1831    distribute such modifications or work under the terms of Section 1\n\
1832    above, provided that you also meet all of these conditions:\n\
1833    \n\
1834        a) You must cause the modified files to carry prominent notices\n\
1835        stating that you changed the files and the date of any change.\n\
1836    \n\
1837        b) You must cause any work that you distribute or publish, that in\n\
1838        whole or in part contains or is derived from the Program or any\n\
1839        part thereof, to be licensed as a whole at no charge to all third\n\
1840        parties under the terms of this License.\n\
1841    \n\
1842        c) If the modified program normally reads commands interactively\n\
1843        when run, you must cause it, when started running for such\n\
1844        interactive use in the most ordinary way, to print or display an\n\
1845        announcement including an appropriate copyright notice and a\n\
1846        notice that there is no warranty (or else, saying that you provide\n\
1847        a warranty) and that users may redistribute the program under\n\
1848        these conditions, and telling the user how to view a copy of this\n\
1849        License.  (Exception: if the Program itself is interactive but\n\
1850        does not normally print such an announcement, your work based on\n\
1851        the Program is not required to print an announcement.)\n\
1852    \n\
1853    These requirements apply to the modified work as a whole.  If\n\
1854    identifiable sections of that work are not derived from the Program,\n\
1855    and can be reasonably considered independent and separate works in\n\
1856    themselves, then this License, and its terms, do not apply to those\n\
1857    sections when you distribute them as separate works.  But when you\n\
1858    distribute the same sections as part of a whole which is a work based\n\
1859    on the Program, the distribution of the whole must be on the terms of\n\
1860    this License, whose permissions for other licensees extend to the\n\
1861    entire whole, and thus to each and every part regardless of who wrote it.\n\
1862    \n\
1863    Thus, it is not the intent of this section to claim rights or contest\n\
1864    your rights to work written entirely by you; rather, the intent is to\n\
1865    exercise the right to control the distribution of derivative or\n\
1866    collective works based on the Program.\n\
1867    \n\
1868    In addition, mere aggregation of another work not based on the Program\n\
1869    with the Program (or with a work based on the Program) on a volume of\n\
1870    a storage or distribution medium does not bring the other work under\n\
1871    the scope of this License.\n\
1872    \n\
1873      3. You may copy and distribute the Program (or a work based on it,\n\
1874    under Section 2) in object code or executable form under the terms of\n\
1875    Sections 1 and 2 above provided that you also do one of the following:\n\
1876    \n\
1877        a) Accompany it with the complete corresponding machine-readable\n\
1878        source code, which must be distributed under the terms of Sections\n\
1879        1 and 2 above on a medium customarily used for software interchange; or,\n\
1880    \n\
1881        b) Accompany it with a written offer, valid for at least three\n\
1882        years, to give any third party, for a charge no more than your\n\
1883        cost of physically performing source distribution, a complete\n\
1884        machine-readable copy of the corresponding source code, to be\n\
1885        distributed under the terms of Sections 1 and 2 above on a medium\n\
1886        customarily used for software interchange; or,\n\
1887    \n\
1888        c) Accompany it with the information you received as to the offer\n\
1889        to distribute corresponding source code.  (This alternative is\n\
1890        allowed only for noncommercial distribution and only if you\n\
1891        received the program in object code or executable form with such\n\
1892        an offer, in accord with Subsection b above.)\n\
1893    \n\
1894    The source code for a work means the preferred form of the work for\n\
1895    making modifications to it.  For an executable work, complete source\n\
1896    code means all the source code for all modules it contains, plus any\n\
1897    associated interface definition files, plus the scripts used to\n\
1898    control compilation and installation of the executable.  However, as a\n\
1899    special exception, the source code distributed need not include\n\
1900    anything that is normally distributed (in either source or binary\n\
1901    form) with the major components (compiler, kernel, and so on) of the\n\
1902    operating system on which the executable runs, unless that component\n\
1903    itself accompanies the executable.\n\
1904    \n\
1905    If distribution of executable or object code is made by offering\n\
1906    access to copy from a designated place, then offering equivalent\n\
1907    access to copy the source code from the same place counts as\n\
1908    distribution of the source code, even though third parties are not\n\
1909    compelled to copy the source along with the object code.\n\
1910    \n\
1911      4. You may not copy, modify, sublicense, or distribute the Program\n\
1912    except as expressly provided under this License.  Any attempt\n\
1913    otherwise to copy, modify, sublicense or distribute the Program is\n\
1914    void, and will automatically terminate your rights under this License.\n\
1915    However, parties who have received copies, or rights, from you under\n\
1916    this License will not have their licenses terminated so long as such\n\
1917    parties remain in full compliance.\n\
1918    \n\
1919      5. You are not required to accept this License, since you have not\n\
1920    signed it.  However, nothing else grants you permission to modify or\n\
1921    distribute the Program or its derivative works.  These actions are\n\
1922    prohibited by law if you do not accept this License.  Therefore, by\n\
1923    modifying or distributing the Program (or any work based on the\n\
1924    Program), you indicate your acceptance of this License to do so, and\n\
1925    all its terms and conditions for copying, distributing or modifying\n\
1926    the Program or works based on it.\n\
1927    \n\
1928      6. Each time you redistribute the Program (or any work based on the\n\
1929    Program), the recipient automatically receives a license from the\n\
1930    original licensor to copy, distribute or modify the Program subject to\n\
1931    these terms and conditions.  You may not impose any further\n\
1932    restrictions on the recipients' exercise of the rights granted herein.\n\
1933    You are not responsible for enforcing compliance by third parties to\n\
1934    this License.\n\
1935    \n\
1936      7. If, as a consequence of a court judgment or allegation of patent\n\
1937    infringement or for any other reason (not limited to patent issues),\n\
1938    conditions are imposed on you (whether by court order, agreement or\n\
1939    otherwise) that contradict the conditions of this License, they do not\n\
1940    excuse you from the conditions of this License.  If you cannot\n\
1941    distribute so as to satisfy simultaneously your obligations under this\n\
1942    License and any other pertinent obligations, then as a consequence you\n\
1943    may not distribute the Program at all.  For example, if a patent\n\
1944    license would not permit royalty-free redistribution of the Program by\n\
1945    all those who receive copies directly or indirectly through you, then\n\
1946    the only way you could satisfy both it and this License would be to\n\
1947    refrain entirely from distribution of the Program.\n\
1948    \n\
1949    If any portion of this section is held invalid or unenforceable under\n\
1950    any particular circumstance, the balance of the section is intended to\n\
1951    apply and the section as a whole is intended to apply in other\n\
1952    circumstances.\n\
1953    \n\
1954    It is not the purpose of this section to induce you to infringe any\n\
1955    patents or other property right claims or to contest validity of any\n\
1956    such claims; this section has the sole purpose of protecting the\n\
1957    integrity of the free software distribution system, which is\n\
1958    implemented by public license practices.  Many people have made\n\
1959    generous contributions to the wide range of software distributed\n\
1960    through that system in reliance on consistent application of that\n\
1961    system; it is up to the author/donor to decide if he or she is willing\n\
1962    to distribute software through any other system and a licensee cannot\n\
1963    impose that choice.\n\
1964    \n\
1965    This section is intended to make thoroughly clear what is believed to\n\
1966    be a consequence of the rest of this License.\n\
1967    \n\
1968      8. If the distribution and/or use of the Program is restricted in\n\
1969    certain countries either by patents or by copyrighted interfaces, the\n\
1970    original copyright holder who places the Program under this License\n\
1971    may add an explicit geographical distribution limitation excluding\n\
1972    those countries, so that distribution is permitted only in or among\n\
1973    countries not thus excluded.  In such case, this License incorporates\n\
1974    the limitation as if written in the body of this License.\n\
1975    \n\
1976      9. The Free Software Foundation may publish revised and/or new versions\n\
1977    of the General Public License from time to time.  Such new versions will\n\
1978    be similar in spirit to the present version, but may differ in detail to\n\
1979    address new problems or concerns.\n\
1980    \n\
1981    Each version is given a distinguishing version number.  If the Program\n\
1982    specifies a version number of this License which applies to it and \"any\n\
1983    later version\", you have the option of following the terms and conditions\n\
1984    either of that version or of any later version published by the Free\n\
1985    Software Foundation.  If the Program does not specify a version number of\n\
1986    this License, you may choose any version ever published by the Free Software\n\
1987    Foundation.\n\
1988    \n\
1989      10. If you wish to incorporate parts of the Program into other free\n\
1990    programs whose distribution conditions are different, write to the author\n\
1991    to ask for permission.  For software which is copyrighted by the Free\n\
1992    Software Foundation, write to the Free Software Foundation; we sometimes\n\
1993    make exceptions for this.  Our decision will be guided by the two goals\n\
1994    of preserving the free status of all derivatives of our free software and\n\
1995    of promoting the sharing and reuse of software generally.\n");
1996    }
1997    
1998    extern void warranty(environment *env)
1999    {
2000      printf("                          NO WARRANTY\n\
2001    \n\
2002      11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY\n\
2003    FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN\n\
2004    OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES\n\
2005    PROVIDE THE PROGRAM \"AS IS\" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED\n\
2006    OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF\n\
2007    MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS\n\
2008    TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE\n\
2009    PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,\n\
2010    REPAIR OR CORRECTION.\n\
2011    \n\
2012      12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING\n\
2013    WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR\n\
2014    REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,\n\
2015    INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING\n\
2016    OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED\n\
2017    TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY\n\
2018    YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER\n\
2019    PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE\n\
2020    POSSIBILITY OF SUCH DAMAGES.\n");
2021    }
2022    
2023    /* "*" */
2024    extern void sx_2a(environment *env)
2025    {
2026      int a, b;
2027      float fa, fb;
2028    
2029      if((env->head)==NULL || env->head->next==NULL) {
2030        printerr("Too Few Arguments");
2031        env->err=1;
2032        return;
2033      }
2034      
2035      if(env->head->item->type==integer
2036         && env->head->next->item->type==integer) {
2037        a=env->head->item->content.i;
2038        toss(env); if(env->err) return;
2039        b=env->head->item->content.i;
2040        toss(env); if(env->err) return;
2041        push_int(env, b*a);
2042    
2043        return;
2044      }
2045    
2046      if(env->head->item->type==tfloat
2047         && env->head->next->item->type==tfloat) {
2048        fa= env->head->item->content.f;
2049        toss(env); if(env->err) return;
2050        fb= env->head->item->content.f;
2051        toss(env); if(env->err) return;
2052        push_float(env, fb*fa);
2053        
2054        return;
2055      }
2056    
2057      if(env->head->item->type==tfloat
2058         && env->head->next->item->type==integer) {
2059        fa= env->head->item->content.f;
2060        toss(env); if(env->err) return;
2061        b= env->head->item->content.i;
2062        toss(env); if(env->err) return;
2063        push_float(env, b*fa);
2064        
2065        return;
2066      }
2067    
2068      if(env->head->item->type==integer
2069         && env->head->next->item->type==tfloat) {
2070        a= env->head->item->content.i;
2071        toss(env); if(env->err) return;
2072        fb= env->head->item->content.f;
2073        toss(env); if(env->err) return;
2074        push_float(env, fb*a);
2075    
2076        return;
2077      }
2078    
2079      printerr("Bad Argument Type");
2080      env->err=2;
2081    }
2082    
2083    /* "/" */
2084    extern void sx_2f(environment *env)
2085    {
2086      int a, b;
2087      float fa, fb;
2088    
2089      if((env->head)==NULL || env->head->next==NULL) {
2090        printerr("Too Few Arguments");
2091        env->err=1;
2092        return;
2093      }
2094      
2095      if(env->head->item->type==integer
2096         && env->head->next->item->type==integer) {
2097        a=env->head->item->content.i;
2098        toss(env); if(env->err) return;
2099        b=env->head->item->content.i;
2100        toss(env); if(env->err) return;
2101        push_float(env, b/a);
2102    
2103        return;
2104      }
2105    
2106      if(env->head->item->type==tfloat
2107         && env->head->next->item->type==tfloat) {
2108        fa= env->head->item->content.f;
2109        toss(env); if(env->err) return;
2110        fb= env->head->item->content.f;
2111        toss(env); if(env->err) return;
2112        push_float(env, fb/fa);
2113        
2114        return;
2115      }
2116    
2117      if(env->head->item->type==tfloat
2118         && env->head->next->item->type==integer) {
2119        fa= env->head->item->content.f;
2120        toss(env); if(env->err) return;
2121        b= env->head->item->content.i;
2122        toss(env); if(env->err) return;
2123        push_float(env, b/fa);
2124        
2125        return;
2126      }
2127    
2128      if(env->head->item->type==integer
2129         && env->head->next->item->type==tfloat) {
2130        a= env->head->item->content.i;
2131        toss(env); if(env->err) return;
2132        fb= env->head->item->content.f;
2133        toss(env); if(env->err) return;
2134        push_float(env, fb/a);
2135    
2136        return;
2137      }
2138    
2139      printerr("Bad Argument Type");
2140      env->err=2;
2141    }
2142    
2143    /* "mod" */
2144    extern void mod(environment *env)
2145    {
2146      int a, b;
2147    
2148      if((env->head)==NULL || env->head->next==NULL) {
2149        printerr("Too Few Arguments");
2150        env->err= 1;
2151        return;
2152      }
2153      
2154      if(env->head->item->type==integer
2155         && env->head->next->item->type==integer) {
2156        a= env->head->item->content.i;
2157        toss(env); if(env->err) return;
2158        b= env->head->item->content.i;
2159        toss(env); if(env->err) return;
2160        push_int(env, b%a);
2161    
2162        return;
2163      }
2164    
2165      printerr("Bad Argument Type");
2166      env->err=2;
2167    }
2168    
2169    /* "div" */
2170    extern void sx_646976(environment *env)
2171    {
2172      int a, b;
2173      
2174      if((env->head)==NULL || env->head->next==NULL) {
2175        printerr("Too Few Arguments");
2176        env->err= 1;
2177        return;
2178      }
2179    
2180      if(env->head->item->type==integer
2181         && env->head->next->item->type==integer) {
2182        a= env->head->item->content.i;
2183        toss(env); if(env->err) return;
2184        b= env->head->item->content.i;
2185        toss(env); if(env->err) return;
2186        push_int(env, (int)b/a);
2187    
2188        return;
2189      }
2190    
2191      printerr("Bad Argument Type");
2192      env->err= 2;
2193  }  }
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