/[cvs]/stack/stack.c
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revision 1.77 by teddy, Wed Feb 13 19:53:55 2002 UTC revision 1.86 by teddy, Fri Feb 15 14:44:24 2002 UTC
# Line 1  Line 1 
1  /* printf, sscanf, fgets, fprintf */  /* printf, sscanf, fgets, fprintf, fopen, perror */
2  #include <stdio.h>  #include <stdio.h>
3  /* exit, EXIT_SUCCESS, malloc, free */  /* exit, EXIT_SUCCESS, malloc, free */
4  #include <stdlib.h>  #include <stdlib.h>
# Line 8  Line 8 
8  #include <dlfcn.h>  #include <dlfcn.h>
9  /* strcmp, strcpy, strlen, strcat, strdup */  /* strcmp, strcpy, strlen, strcat, strdup */
10  #include <string.h>  #include <string.h>
11    /* getopt, STDIN_FILENO, STDOUT_FILENO */
12    #include <unistd.h>
13    /* EX_NOINPUT, EX_USAGE */
14    #include <sysexits.h>
15    /* mtrace, muntrace */
16    #include <mcheck.h>
17    
18  #define HASHTBLSIZE 2048  #define HASHTBLSIZE 2048
19    
# Line 58  typedef struct { Line 64  typedef struct {
64    stackitem *head;              /* Head of the stack */    stackitem *head;              /* Head of the stack */
65    hashtbl symbols;              /* Hash table of all variable bindings */    hashtbl symbols;              /* Hash table of all variable bindings */
66    int err;                      /* Error flag */    int err;                      /* Error flag */
   int non_eval_flag;  
67    char *in_string;              /* Input pending to be read */    char *in_string;              /* Input pending to be read */
68      char *free_string;            /* Free this string when all input is
69                                       read from in_string */
70      FILE *inputstream;            /* stdin or a file, most likely */
71      int interactive;              /* print prompts, stack, etc */
72  } environment;  } environment;
73    
74  /* A type for pointers to external functions */  /* A type for pointers to external functions */
# Line 71  void init_env(environment *env) Line 80  void init_env(environment *env)
80  {  {
81    int i;    int i;
82    
83    env->in_string= NULL;    env->head= NULL;
   env->err= 0;  
   env->non_eval_flag= 0;  
84    for(i= 0; i<HASHTBLSIZE; i++)    for(i= 0; i<HASHTBLSIZE; i++)
85      env->symbols[i]= NULL;      env->symbols[i]= NULL;
86      env->err= 0;
87      env->in_string= NULL;
88      env->free_string= NULL;
89      env->inputstream= stdin;
90      env->interactive= 1;
91  }  }
92    
93  void printerr(const char* in_string) {  void printerr(const char* in_string) {
# Line 100  void free_val(value *val){ Line 112  void free_val(value *val){
112          free(item);             /* free the stackitem */          free(item);             /* free the stackitem */
113          item=temp;              /* go to next stackitem */          item=temp;              /* go to next stackitem */
114        }        }
       free(val);                /* Free the actual list value */  
115        break;        break;
116      case integer:      case integer:
117      case func:      case func:
118          break;
119      case symb:      case symb:
120          free(((symbol*)(val->content.ptr))->id);
121          if(((symbol*)(val->content.ptr))->val!=NULL)
122            free_val(((symbol*)(val->content.ptr))->val);
123          free(val->content.ptr);
124        break;        break;
125      }      }
126        free(val);          /* Free the actual value structure */
127    }    }
128  }  }
129    
# Line 172  void push_int(environment *env, int in_v Line 189  void push_int(environment *env, int in_v
189        
190    new_value->content.val= in_val;    new_value->content.val= in_val;
191    new_value->type= integer;    new_value->type= integer;
192    new_value->refcount=1;    new_value->refcount= 0;
193    
194    push_val(env, new_value);    push_val(env, new_value);
195  }  }
# Line 185  void push_cstring(environment *env, cons Line 202  void push_cstring(environment *env, cons
202    new_value->content.ptr= malloc(strlen(in_string)+1);    new_value->content.ptr= malloc(strlen(in_string)+1);
203    strcpy(new_value->content.ptr, in_string);    strcpy(new_value->content.ptr, in_string);
204    new_value->type= string;    new_value->type= string;
205    new_value->refcount=1;    new_value->refcount= 0;
206    
207    push_val(env, new_value);    push_val(env, new_value);
208  }  }
# Line 211  char *mangle_str(const char *old_string) Line 228  char *mangle_str(const char *old_string)
228  }  }
229    
230  extern void mangle(environment *env){  extern void mangle(environment *env){
   value *new_value;  
231    char *new_string;    char *new_string;
232    
233    if((env->head)==NULL) {    if((env->head)==NULL) {
# Line 231  extern void mangle(environment *env){ Line 247  extern void mangle(environment *env){
247    toss(env);    toss(env);
248    if(env->err) return;    if(env->err) return;
249    
250    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, new_value);  
251  }  }
252    
253  /* Push a symbol onto the stack. */  /* Push a symbol onto the stack. */
# Line 281  void push_sym(environment *env, const ch Line 292  void push_sym(environment *env, const ch
292      if(handle==NULL)            /* If no handle */      if(handle==NULL)            /* If no handle */
293        handle= dlopen(NULL, RTLD_LAZY);        handle= dlopen(NULL, RTLD_LAZY);
294    
295      funcptr= dlsym(handle, in_string); /* Get function pointer */      mangled=mangle_str(in_string); /* mangle the name */
296        funcptr= dlsym(handle, mangled); /* and try to find it */
297        free(mangled);
298      dlerr=dlerror();      dlerr=dlerror();
299      if(dlerr != NULL) {         /* If no function was found */      if(dlerr != NULL) {         /* If no function was found */
300        mangled=mangle_str(in_string);        funcptr= dlsym(handle, in_string); /* Get function pointer */
       funcptr= dlsym(handle, mangled); /* try mangling it */  
       free(mangled);  
301        dlerr=dlerror();        dlerr=dlerror();
302      }      }
303      if(dlerr==NULL) {           /* If a function was found */      if(dlerr==NULL) {           /* If a function was found */
# Line 338  extern void type(environment *env){ Line 349  extern void type(environment *env){
349  }      }    
350    
351  /* Prints the top element of the stack. */  /* Prints the top element of the stack. */
352  void print_h(stackitem *stack_head)  void print_h(stackitem *stack_head, int noquote)
353  {  {
354    switch(stack_head->item->type) {    switch(stack_head->item->type) {
355    case integer:    case integer:
356      printf("%d", stack_head->item->content.val);      printf("%d", stack_head->item->content.val);
357      break;      break;
358    case string:    case string:
359      printf("%s", (char*)stack_head->item->content.ptr);      if(noquote)
360          printf("%s", (char*)stack_head->item->content.ptr);
361        else
362          printf("\"%s\"", (char*)stack_head->item->content.ptr);
363      break;      break;
364    case symb:    case symb:
365      printf("%s", ((symbol *)(stack_head->item->content.ptr))->id);      printf("%s", ((symbol *)(stack_head->item->content.ptr))->id);
# Line 358  void print_h(stackitem *stack_head) Line 372  void print_h(stackitem *stack_head)
372      stack_head=(stackitem *)(stack_head->item->content.ptr);      stack_head=(stackitem *)(stack_head->item->content.ptr);
373      printf("[ ");      printf("[ ");
374      while(stack_head != NULL) {      while(stack_head != NULL) {
375        print_h(stack_head);        print_h(stack_head, noquote);
376        printf(" ");        printf(" ");
377        stack_head=stack_head->next;        stack_head=stack_head->next;
378      }      }
# Line 373  extern void print_(environment *env) { Line 387  extern void print_(environment *env) {
387      env->err=1;      env->err=1;
388      return;      return;
389    }    }
390    print_h(env->head);    print_h(env->head, 0);
391      nl();
392  }  }
393    
394  /* Prints the top element of the stack and then discards it. */  /* Prints the top element of the stack and then discards it. */
# Line 384  extern void print(environment *env) Line 399  extern void print(environment *env)
399    toss(env);    toss(env);
400  }  }
401    
402    extern void princ_(environment *env) {
403      if(env->head==NULL) {
404        printerr("Too Few Arguments");
405        env->err=1;
406        return;
407      }
408      print_h(env->head, 1);
409    }
410    
411    /* Prints the top element of the stack and then discards it. */
412    extern void princ(environment *env)
413    {
414      princ_(env);
415      if(env->err) return;
416      toss(env);
417    }
418    
419  /* Only to be called by function printstack. */  /* Only to be called by function printstack. */
420  void print_st(stackitem *stack_head, long counter)  void print_st(stackitem *stack_head, long counter)
421  {  {
422    if(stack_head->next != NULL)    if(stack_head->next != NULL)
423      print_st(stack_head->next, counter+1);      print_st(stack_head->next, counter+1);
424    printf("%ld: ", counter);    printf("%ld: ", counter);
425    print_h(stack_head);    print_h(stack_head, 0);
426    nl();    nl();
427  }  }
428    
# Line 398  void print_st(stackitem *stack_head, lon Line 430  void print_st(stackitem *stack_head, lon
430  extern void printstack(environment *env)  extern void printstack(environment *env)
431  {  {
432    if(env->head == NULL) {    if(env->head == NULL) {
433        printf("Stack Empty\n");
434      return;      return;
435    }    }
436    print_st(env->head, 1);    print_st(env->head, 1);
   nl();  
437  }  }
438    
439  /* Swap the two top elements on the stack. */  /* Swap the two top elements on the stack. */
# Line 474  extern void eval(environment *env) Line 506  extern void eval(environment *env)
506    value* temp_val;    value* temp_val;
507    stackitem* iterator;    stackitem* iterator;
508    
509     eval_start:
510    
511    if(env->head==NULL) {    if(env->head==NULL) {
512      printerr("Too Few Arguments");      printerr("Too Few Arguments");
513      env->err=1;      env->err=1;
514      return;      return;
515    }    }
516    
  eval_start:  
   
517    switch(env->head->item->type) {    switch(env->head->item->type) {
518      /* if it's a symbol */      /* if it's a symbol */
519    case symb:    case symb:
# Line 531  extern void eval(environment *env) Line 563  extern void eval(environment *env)
563    
564  /* Reverse (flip) a list */  /* Reverse (flip) a list */
565  extern void rev(environment *env){  extern void rev(environment *env){
566    stackitem *item, *temp, *prev= NULL;    stackitem *old_head, *new_head, *item;
567    
568    if((env->head)==NULL) {    if((env->head)==NULL) {
569      printerr("Too Few Arguments");      printerr("Too Few Arguments");
# Line 545  extern void rev(environment *env){ Line 577  extern void rev(environment *env){
577      return;      return;
578    }    }
579    
580    item= (stackitem *)(env->head->item->content.ptr);    old_head=(stackitem *)(env->head->item->content.ptr);
581    while(item->next!=NULL){    new_head=NULL;
582      temp= item->next;    while(old_head != NULL){
583      item->next= prev;      item=old_head;
584      prev= item;      old_head=old_head->next;
585      item= temp;      item->next=new_head;
586        new_head=item;
587    }    }
588    item->next= prev;    env->head->item->content.ptr=new_head;
   
   env->head->item->content.ptr=item;  
589  }  }
590    
591  /* Make a list. */  /* Make a list. */
# Line 590  extern void pack(environment *env) Line 621  extern void pack(environment *env)
621    pack= malloc(sizeof(value));    pack= malloc(sizeof(value));
622    pack->type= list;    pack->type= list;
623    pack->content.ptr= temp;    pack->content.ptr= temp;
624    pack->refcount= 1;    pack->refcount= 0;
625    
626    push_val(env, pack);    push_val(env, pack);
627    rev(env);    rev(env);
# Line 719  extern void def(environment *env) Line 750  extern void def(environment *env)
750    
751  extern void clear(environment *);  extern void clear(environment *);
752  void forget_sym(symbol **);  void forget_sym(symbol **);
753    extern void words(environment *);
754    
755  /* Quit stack. */  /* Quit stack. */
756  extern void quit(environment *env)  extern void quit(environment *env)
# Line 726  extern void quit(environment *env) Line 758  extern void quit(environment *env)
758    long i;    long i;
759    
760    clear(env);    clear(env);
761    
762    if (env->err) return;    if (env->err) return;
763    for(i= 0; i<HASHTBLSIZE; i++) {    for(i= 0; i<HASHTBLSIZE; i++) {
764      if (env->symbols[i]!= NULL) {      while(env->symbols[i]!= NULL) {
765        forget_sym(&(env->symbols[i]));        forget_sym(&(env->symbols[i]));
       env->symbols[i]= NULL;  
766      }      }
767        env->symbols[i]= NULL;
768    }    }
769    
770      if(env->free_string!=NULL)
771        free(env->free_string);
772      
773      muntrace();
774    
775    exit(EXIT_SUCCESS);    exit(EXIT_SUCCESS);
776  }  }
777    
# Line 801  extern void errn(environment *env){ Line 840  extern void errn(environment *env){
840    push_int(env, env->err);    push_int(env, env->err);
841  }  }
842    
843  extern void read(environment*);  extern void sx_72656164(environment*);
844    
845  int main()  int main(int argc, char **argv)
846  {  {
847    environment myenv;    environment myenv;
848    
849      int c;                        /* getopt option character */
850    
851      mtrace();
852    
853    init_env(&myenv);    init_env(&myenv);
854    
855      myenv.interactive = isatty(STDIN_FILENO) && isatty(STDOUT_FILENO);
856    
857      while ((c = getopt (argc, argv, "i")) != -1)
858        switch (c)
859          {
860          case 'i':
861            myenv.interactive = 1;
862            break;
863          case '?':
864            fprintf (stderr,
865                     "Unknown option character `\\x%x'.\n",
866                     optopt);
867            return EX_USAGE;
868          default:
869            abort ();
870          }
871      
872      if (optind < argc) {
873        myenv.interactive = 0;
874        myenv.inputstream= fopen(argv[optind], "r");
875        if(myenv.inputstream== NULL) {
876          perror(argv[0]);
877          exit (EX_NOINPUT);
878        }
879      }
880    
881    while(1) {    while(1) {
882      if(myenv.in_string==NULL)      if(myenv.in_string==NULL) {
883        printstack(&myenv);        if (myenv.interactive) {
884      read(&myenv);          if(myenv.err) {
885      if(myenv.err) {            printf("(error %d)\n", myenv.err);
886        printf("(error %d) ", myenv.err);          }
887            nl();
888            printstack(&myenv);
889            printf("> ");
890          }
891        myenv.err=0;        myenv.err=0;
892        }
893        sx_72656164(&myenv);
894        if (myenv.err==4) {
895          return EX_NOINPUT;
896      } else if(myenv.head!=NULL      } else if(myenv.head!=NULL
897                && myenv.head->item->type==symb                && myenv.head->item->type==symb
898                && ((symbol*)(myenv.head->item->content.ptr))->id[0]==';') {                && ((symbol*)(myenv.head->item->content.ptr))->id[0]==';') {
# Line 827  int main() Line 904  int main()
904    return EXIT_FAILURE;    return EXIT_FAILURE;
905  }  }
906    
907  /* + */  /* "+" */
908  extern void sx_2b(environment *env) {  extern void sx_2b(environment *env) {
909    int a, b;    int a, b;
910    size_t len;    size_t len;
# Line 877  extern void sx_2b(environment *env) { Line 954  extern void sx_2b(environment *env) {
954    }    }
955  }  }
956    
957  /* - */  /* "-" */
958  extern void sx_2d(environment *env) {  extern void sx_2d(environment *env) {
959    int a, b;    int a, b;
960    
# Line 906  extern void sx_2d(environment *env) { Line 983  extern void sx_2d(environment *env) {
983    }    }
984  }  }
985    
986  /* > */  /* ">" */
987  extern void sx_3e(environment *env) {  extern void sx_3e(environment *env) {
988    int a, b;    int a, b;
989    
# Line 980  value *copy_val(value *old_value){ Line 1057  value *copy_val(value *old_value){
1057    return new_value;    return new_value;
1058  }  }
1059    
1060  /* duplicates an item on the stack */  /* "dup"; duplicates an item on the stack */
1061  extern void dup(environment *env) {  extern void sx_647570(environment *env) {
1062    if((env->head)==NULL) {    if((env->head)==NULL) {
1063      printerr("Too Few Arguments");      printerr("Too Few Arguments");
1064      env->err=1;      env->err=1;
# Line 1057  extern void ifelse(environment *env) { Line 1134  extern void ifelse(environment *env) {
1134    eval(env);    eval(env);
1135  }  }
1136    
1137  /* while */  /* "while" */
1138  extern void sx_7768696c65(environment *env) {  extern void sx_7768696c65(environment *env) {
1139    
1140    int truth;    int truth;
# Line 1103  extern void sx_7768696c65(environment *e Line 1180  extern void sx_7768696c65(environment *e
1180    free_val(loop);    free_val(loop);
1181  }  }
1182    
1183  /* For-loop */  /* "for"; For-loop */
1184  extern void sx_666f72(environment *env) {  extern void sx_666f72(environment *env) {
1185        
1186    value *loop, *foo;    value *loop, *foo;
# Line 1142  extern void sx_666f72(environment *env) Line 1219  extern void sx_666f72(environment *env)
1219    free_val(foo);    free_val(foo);
1220  }  }
1221    
1222  /* 'to' */  /* "to" */
1223  extern void to(environment *env) {  extern void to(environment *env) {
1224    int i, start, ending;    int i, start, ending;
1225    stackitem *temp_head;    stackitem *temp_head;
# Line 1179  extern void to(environment *env) { Line 1256  extern void to(environment *env) {
1256    
1257    temp_val= malloc(sizeof(value));    temp_val= malloc(sizeof(value));
1258    temp_val->content.ptr= env->head;    temp_val->content.ptr= env->head;
1259    temp_val->refcount= 1;    temp_val->refcount= 0;
1260    temp_val->type= list;    temp_val->type= list;
1261    env->head= temp_head;    env->head= temp_head;
1262    push_val(env, temp_val);    push_val(env, temp_val);
# Line 1189  extern void to(environment *env) { Line 1266  extern void to(environment *env) {
1266  extern void readline(environment *env) {  extern void readline(environment *env) {
1267    char in_string[101];    char in_string[101];
1268    
1269    fgets(in_string, 100, stdin);    if(fgets(in_string, 100, env->inputstream)==NULL)
1270    push_cstring(env, in_string);      push_cstring(env, "");
1271      else
1272        push_cstring(env, in_string);
1273  }  }
1274    
1275  /* Read a value and place on stack */  /* "read"; Read a value and place on stack */
1276  extern void read(environment *env) {  extern void sx_72656164(environment *env) {
1277    const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%[\001-\377]";    const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%n";
1278    const char strform[]= "\"%[^\"]\"%[\001-\377]";    const char strform[]= "\"%[^\"]\"%n";
1279    const char intform[]= "%i%[\001-\377]";    const char intform[]= "%i%n";
1280    const char blankform[]= "%*[ \t]%[\001-\377]";    const char blankform[]= "%*[ \t]%n";
1281    const char ebrackform[]= "%*1[]]%[\001-\377]";    const char ebrackform[]= "%*1[]]%n";
1282    const char semicform[]= "%*1[;]%[\001-\377]";    const char semicform[]= "%*1[;]%n";
1283    const char bbrackform[]= "%*1[[]%[\001-\377]";    const char bbrackform[]= "%*1[[]%n";
1284    
1285    int itemp;    int itemp, readlength= -1;
1286    static int depth= 0;    static int depth= 0;
1287    char *rest, *match;    char *match;
1288    size_t inlength;    size_t inlength;
1289    
1290    if(env->in_string==NULL) {    if(env->in_string==NULL) {
1291        if(depth > 0 && env->interactive) {
1292          printf("]> ");
1293        }
1294      readline(env); if(env->err) return;      readline(env); if(env->err) return;
1295    
1296        if(((char *)(env->head->item->content.ptr))[0]=='\0'){
1297          env->err= 4;              /* "" means EOF */
1298          return;
1299        }
1300            
1301      env->in_string= malloc(strlen(env->head->item->content.ptr)+1);      env->in_string= malloc(strlen(env->head->item->content.ptr)+1);
1302        env->free_string= env->in_string; /* Save the original pointer */
1303      strcpy(env->in_string, env->head->item->content.ptr);      strcpy(env->in_string, env->head->item->content.ptr);
1304      toss(env); if(env->err) return;      toss(env); if(env->err) return;
1305    }    }
1306        
1307    inlength= strlen(env->in_string)+1;    inlength= strlen(env->in_string)+1;
1308    match= malloc(inlength);    match= malloc(inlength);
   rest= malloc(inlength);  
1309    
1310    if(sscanf(env->in_string, blankform, rest)) {    if(sscanf(env->in_string, blankform, &readlength)!=EOF
1311         && readlength != -1) {
1312      ;      ;
1313    } else if(sscanf(env->in_string, intform, &itemp, rest) > 0) {    } else if(sscanf(env->in_string, intform, &itemp, &readlength) != EOF
1314                && readlength != -1) {
1315      push_int(env, itemp);      push_int(env, itemp);
1316    } else if(sscanf(env->in_string, strform, match, rest) > 0) {    } else if(sscanf(env->in_string, strform, match, &readlength) != EOF
1317                && readlength != -1) {
1318      push_cstring(env, match);      push_cstring(env, match);
1319    } else if(sscanf(env->in_string, symbform, match, rest) > 0) {    } else if(sscanf(env->in_string, symbform, match, &readlength) != EOF
1320                && readlength != -1) {
1321      push_sym(env, match);      push_sym(env, match);
1322    } else if(sscanf(env->in_string, ebrackform, rest) > 0) {    } else if(sscanf(env->in_string, ebrackform, &readlength) != EOF
1323                && readlength != -1) {
1324      pack(env); if(env->err) return;      pack(env); if(env->err) return;
1325      if(depth!=0) depth--;      if(depth != 0) depth--;
1326    } else if(sscanf(env->in_string, semicform, rest) > 0) {    } else if(sscanf(env->in_string, semicform, &readlength) != EOF
1327                && readlength != -1) {
1328      push_sym(env, ";");      push_sym(env, ";");
1329    } else if(sscanf(env->in_string, bbrackform, rest) > 0) {    } else if(sscanf(env->in_string, bbrackform, &readlength) != EOF
1330                && readlength != -1) {
1331      push_sym(env, "[");      push_sym(env, "[");
1332      depth++;      depth++;
1333    } else {    } else {
1334      free(rest);      free(env->free_string);
1335      rest= NULL;      env->in_string = env->free_string = NULL;
1336      }
1337      if ( env->in_string != NULL) {
1338        env->in_string += readlength;
1339    }    }
         
   free(env->in_string);  
   free(match);  
1340    
1341    env->in_string= rest;    free(match);
1342    
1343    if(depth)    if(depth)
1344      return read(env);      return sx_72656164(env);
1345  }  }
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