/[cvs]/stack/stack.c
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revision 1.73 by masse, Tue Feb 12 23:16:56 2002 UTC revision 1.80 by teddy, Thu Feb 14 12:20:09 2002 UTC
# Line 60  typedef struct { Line 60  typedef struct {
60    int err;                      /* Error flag */    int err;                      /* Error flag */
61    int non_eval_flag;    int non_eval_flag;
62    char *in_string;              /* Input pending to be read */    char *in_string;              /* Input pending to be read */
63      char *free_string;            /* Free this string when all input is
64                                       read from in_string */
65  } environment;  } environment;
66    
67  /* A type for pointers to external functions */  /* A type for pointers to external functions */
# Line 155  symbol **hash(hashtbl in_hashtbl, const Line 157  symbol **hash(hashtbl in_hashtbl, const
157    }    }
158  }  }
159    
 /* Generic push function. */  
 void push(environment *env, stackitem* in_item)  
 {  
   in_item->next= env->head;  
   env->head= in_item;  
 }  
   
160  /* Push a value onto the stack */  /* Push a value onto the stack */
161  void push_val(environment *env, value *val)  void push_val(environment *env, value *val)
162  {  {
163    stackitem *new_item= malloc(sizeof(stackitem));    stackitem *new_item= malloc(sizeof(stackitem));
164    new_item->item= val;    new_item->item= val;
165    val->refcount++;    val->refcount++;
166    push(env, new_item);    new_item->next= env->head;
167      env->head= new_item;
168  }  }
169    
170  /* Push an integer onto the stack. */  /* Push an integer onto the stack. */
171  void push_int(environment *env, int in_val)  void push_int(environment *env, int in_val)
172  {  {
173    value *new_value= malloc(sizeof(value));    value *new_value= malloc(sizeof(value));
   stackitem *new_item= malloc(sizeof(stackitem));  
   new_item->item= new_value;  
174        
175    new_value->content.val= in_val;    new_value->content.val= in_val;
176    new_value->type= integer;    new_value->type= integer;
177    new_value->refcount=1;    new_value->refcount=1;
178    
179    push(env, new_item);    push_val(env, new_value);
180  }  }
181    
182  /* Copy a string onto the stack. */  /* Copy a string onto the stack. */
183  void push_cstring(environment *env, const char *in_string)  void push_cstring(environment *env, const char *in_string)
184  {  {
185    value *new_value= malloc(sizeof(value));    value *new_value= malloc(sizeof(value));
   stackitem *new_item= malloc(sizeof(stackitem));  
   new_item->item=new_value;  
186    
187    new_value->content.ptr= malloc(strlen(in_string)+1);    new_value->content.ptr= malloc(strlen(in_string)+1);
188    strcpy(new_value->content.ptr, in_string);    strcpy(new_value->content.ptr, in_string);
189    new_value->type= string;    new_value->type= string;
190    new_value->refcount=1;    new_value->refcount=1;
191    
192    push(env, new_item);    push_val(env, new_value);
193  }  }
194    
195  /* Mangle a symbol name to a valid C identifier name */  /* Mangle a symbol name to a valid C identifier name */
# Line 252  extern void mangle(environment *env){ Line 244  extern void mangle(environment *env){
244  /* Push a symbol onto the stack. */  /* Push a symbol onto the stack. */
245  void push_sym(environment *env, const char *in_string)  void push_sym(environment *env, const char *in_string)
246  {  {
   stackitem *new_item;          /* The new stack item */  
   /* ...which will contain... */  
247    value *new_value;             /* A new symbol value */    value *new_value;             /* A new symbol value */
248    /* ...which might point to... */    /* ...which might point to... */
249    symbol **new_symbol;          /* (if needed) A new actual symbol */    symbol **new_symbol;          /* (if needed) A new actual symbol */
# Line 266  void push_sym(environment *env, const ch Line 256  void push_sym(environment *env, const ch
256    const char *dlerr;            /* Dynamic linker error */    const char *dlerr;            /* Dynamic linker error */
257    char *mangled;                /* Mangled function name */    char *mangled;                /* Mangled function name */
258    
   /* Create a new stack item containing a new value */  
   new_item= malloc(sizeof(stackitem));  
259    new_value= malloc(sizeof(value));    new_value= malloc(sizeof(value));
   new_item->item=new_value;  
260    
261    /* The new value is a symbol */    /* The new value is a symbol */
262    new_value->type= symb;    new_value->type= symb;
# Line 313  void push_sym(environment *env, const ch Line 300  void push_sym(environment *env, const ch
300        new_fvalue->refcount= 1;        new_fvalue->refcount= 1;
301      }      }
302    }    }
303    push(env, new_item);    push_val(env, new_value);
304  }  }
305    
306  /* Print newline. */  /* Print newline. */
# Line 353  extern void type(environment *env){ Line 340  extern void type(environment *env){
340  }      }    
341    
342  /* Prints the top element of the stack. */  /* Prints the top element of the stack. */
343  void print_h(stackitem *stack_head)  void print_h(stackitem *stack_head, int noquote)
344  {  {
345    switch(stack_head->item->type) {    switch(stack_head->item->type) {
346    case integer:    case integer:
347      printf("%d", stack_head->item->content.val);      printf("%d", stack_head->item->content.val);
348      break;      break;
349    case string:    case string:
350      printf("%s", (char*)stack_head->item->content.ptr);      if(noquote)
351          printf("%s", (char*)stack_head->item->content.ptr);
352        else
353          printf("\"%s\"", (char*)stack_head->item->content.ptr);
354      break;      break;
355    case symb:    case symb:
356      printf("%s", ((symbol *)(stack_head->item->content.ptr))->id);      printf("%s", ((symbol *)(stack_head->item->content.ptr))->id);
# Line 373  void print_h(stackitem *stack_head) Line 363  void print_h(stackitem *stack_head)
363      stack_head=(stackitem *)(stack_head->item->content.ptr);      stack_head=(stackitem *)(stack_head->item->content.ptr);
364      printf("[ ");      printf("[ ");
365      while(stack_head != NULL) {      while(stack_head != NULL) {
366        print_h(stack_head);        print_h(stack_head, noquote);
367        printf(" ");        printf(" ");
368        stack_head=stack_head->next;        stack_head=stack_head->next;
369      }      }
# Line 388  extern void print_(environment *env) { Line 378  extern void print_(environment *env) {
378      env->err=1;      env->err=1;
379      return;      return;
380    }    }
381    print_h(env->head);    print_h(env->head, 0);
382      nl();
383  }  }
384    
385  /* Prints the top element of the stack and then discards it. */  /* Prints the top element of the stack and then discards it. */
# Line 399  extern void print(environment *env) Line 390  extern void print(environment *env)
390    toss(env);    toss(env);
391  }  }
392    
393    extern void princ_(environment *env) {
394      if(env->head==NULL) {
395        printerr("Too Few Arguments");
396        env->err=1;
397        return;
398      }
399      print_h(env->head, 1);
400    }
401    
402    /* Prints the top element of the stack and then discards it. */
403    extern void princ(environment *env)
404    {
405      princ_(env);
406      if(env->err) return;
407      toss(env);
408    }
409    
410  /* Only to be called by function printstack. */  /* Only to be called by function printstack. */
411  void print_st(stackitem *stack_head, long counter)  void print_st(stackitem *stack_head, long counter)
412  {  {
413    if(stack_head->next != NULL)    if(stack_head->next != NULL)
414      print_st(stack_head->next, counter+1);      print_st(stack_head->next, counter+1);
415    printf("%ld: ", counter);    printf("%ld: ", counter);
416    print_h(stack_head);    print_h(stack_head, 0);
417    nl();    nl();
418  }  }
419    
# Line 413  void print_st(stackitem *stack_head, lon Line 421  void print_st(stackitem *stack_head, lon
421  extern void printstack(environment *env)  extern void printstack(environment *env)
422  {  {
423    if(env->head == NULL) {    if(env->head == NULL) {
424        printf("Stack Empty\n");
425      return;      return;
426    }    }
427    print_st(env->head, 1);    print_st(env->head, 1);
   nl();  
428  }  }
429    
430  /* Swap the two top elements on the stack. */  /* Swap the two top elements on the stack. */
# Line 489  extern void eval(environment *env) Line 497  extern void eval(environment *env)
497    value* temp_val;    value* temp_val;
498    stackitem* iterator;    stackitem* iterator;
499    
500     eval_start:
501    
502    if(env->head==NULL) {    if(env->head==NULL) {
503      printerr("Too Few Arguments");      printerr("Too Few Arguments");
504      env->err=1;      env->err=1;
505      return;      return;
506    }    }
507    
  eval_start:  
   
508    switch(env->head->item->type) {    switch(env->head->item->type) {
509      /* if it's a symbol */      /* if it's a symbol */
510    case symb:    case symb:
# Line 606  extern void pack(environment *env) Line 614  extern void pack(environment *env)
614    pack->content.ptr= temp;    pack->content.ptr= temp;
615    pack->refcount= 1;    pack->refcount= 1;
616    
617    temp= malloc(sizeof(stackitem));    push_val(env, pack);
   temp->item= pack;  
   
   push(env, temp);  
618    rev(env);    rev(env);
619  }  }
620    
# Line 734  extern void def(environment *env) Line 739  extern void def(environment *env)
739    toss(env); toss(env);    toss(env); toss(env);
740  }  }
741    
742    extern void clear(environment *);
743    void forget_sym(symbol **);
744    
745  /* Quit stack. */  /* Quit stack. */
746  extern void quit(environment *env)  extern void quit(environment *env)
747  {  {
748      long i;
749    
750      clear(env);
751      if (env->err) return;
752      for(i= 0; i<HASHTBLSIZE; i++) {
753        while(env->symbols[i]!= NULL) {
754          forget_sym(&(env->symbols[i]));
755        }
756        env->symbols[i]= NULL;
757      }
758    exit(EXIT_SUCCESS);    exit(EXIT_SUCCESS);
759  }  }
760    
# Line 762  extern void words(environment *env) Line 780  extern void words(environment *env)
780    }    }
781  }  }
782    
783    /* Internal forget function */
784    void forget_sym(symbol **hash_entry) {
785      symbol *temp;
786    
787      temp= *hash_entry;
788      *hash_entry= (*hash_entry)->next;
789      
790      if(temp->val!=NULL) {
791        free_val(temp->val);
792      }
793      free(temp->id);
794      free(temp);
795    }
796    
797  /* Forgets a symbol (remove it from the hash table) */  /* Forgets a symbol (remove it from the hash table) */
798  extern void forget(environment *env)  extern void forget(environment *env)
799  {  {
800    char* sym_id;    char* sym_id;
801    stackitem *stack_head= env->head;    stackitem *stack_head= env->head;
   symbol **hash_entry, *temp;  
802    
803    if(stack_head==NULL) {    if(stack_head==NULL) {
804      printerr("Too Few Arguments");      printerr("Too Few Arguments");
# Line 784  extern void forget(environment *env) Line 815  extern void forget(environment *env)
815    sym_id= ((symbol*)(stack_head->item->content.ptr))->id;    sym_id= ((symbol*)(stack_head->item->content.ptr))->id;
816    toss(env);    toss(env);
817    
818    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);  
819  }  }
820    
821  /* Returns the current error number to the stack */  /* Returns the current error number to the stack */
# Line 809  int main() Line 832  int main()
832    init_env(&myenv);    init_env(&myenv);
833    
834    while(1) {    while(1) {
835      if(myenv.in_string==NULL)      if(myenv.in_string==NULL) {
836          nl();
837        printstack(&myenv);        printstack(&myenv);
838          printf("> ");
839        }
840      read(&myenv);      read(&myenv);
841      if(myenv.err) {      if(myenv.err) {
842        printf("(error %d) ", myenv.err);        printf("(error %d) ", myenv.err);
# Line 1144  extern void sx_666f72(environment *env) Line 1170  extern void sx_666f72(environment *env)
1170  /* 'to' */  /* 'to' */
1171  extern void to(environment *env) {  extern void to(environment *env) {
1172    int i, start, ending;    int i, start, ending;
1173      stackitem *temp_head;
1174      value *temp_val;
1175        
1176    if((env->head)==NULL || env->head->next==NULL) {    if((env->head)==NULL || env->head->next==NULL) {
1177      printerr("Too Few Arguments");      printerr("Too Few Arguments");
# Line 1163  extern void to(environment *env) { Line 1191  extern void to(environment *env) {
1191    start= env->head->item->content.val;    start= env->head->item->content.val;
1192    toss(env); if(env->err) return;    toss(env); if(env->err) return;
1193    
1194    push_sym(env, "[");    temp_head= env->head;
1195      env->head= NULL;
1196    
1197    if(ending>=start) {    if(ending>=start) {
1198      for(i= start; i<=ending; i++)      for(i= ending; i>=start; i--)
1199        push_int(env, i);        push_int(env, i);
1200    } else {    } else {
1201      for(i= start; i>=ending; i--)      for(i= ending; i<=start; i++)
1202        push_int(env, i);        push_int(env, i);
1203    }    }
1204    
1205    pack(env); if(env->err) return;    temp_val= malloc(sizeof(value));
1206      temp_val->content.ptr= env->head;
1207      temp_val->refcount= 1;
1208      temp_val->type= list;
1209      env->head= temp_head;
1210      push_val(env, temp_val);
1211  }  }
1212    
1213  /* Read a string */  /* Read a string */
# Line 1186  extern void readline(environment *env) { Line 1220  extern void readline(environment *env) {
1220    
1221  /* Read a value and place on stack */  /* Read a value and place on stack */
1222  extern void read(environment *env) {  extern void read(environment *env) {
1223    const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%[\001-\377]";    const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%n";
1224    const char strform[]= "\"%[^\"]\"%[\001-\377]";    const char strform[]= "\"%[^\"]\"%n";
1225    const char intform[]= "%i%[\001-\377]";    const char intform[]= "%i%n";
1226    const char blankform[]= "%*[ \t]%[\001-\377]";    const char blankform[]= "%*[ \t]%n";
1227    const char ebrackform[]= "%*1[]]%[\001-\377]";    const char ebrackform[]= "%*1[]]%n";
1228    const char semicform[]= "%*1[;]%[\001-\377]";    const char semicform[]= "%*1[;]%n";
1229    const char bbrackform[]= "%*1[[]%[\001-\377]";    const char bbrackform[]= "%*1[[]%n";
1230    
1231    int itemp;    int itemp, readlength= -1;
1232    static int depth= 0;    static int depth= 0;
1233    char *rest, *match;    char *rest, *match;
1234    size_t inlength;    size_t inlength;
1235    
1236    if(env->in_string==NULL) {    if(env->in_string==NULL) {
1237        if(depth > 0) {
1238          printf("]> ");
1239        }
1240      readline(env); if(env->err) return;      readline(env); if(env->err) return;
1241            
1242      env->in_string= malloc(strlen(env->head->item->content.ptr)+1);      env->in_string= malloc(strlen(env->head->item->content.ptr)+1);
1243        env->free_string= env->in_string; /* Save the original pointer */
1244      strcpy(env->in_string, env->head->item->content.ptr);      strcpy(env->in_string, env->head->item->content.ptr);
1245      toss(env); if(env->err) return;      toss(env); if(env->err) return;
1246    }    }
# Line 1211  extern void read(environment *env) { Line 1249  extern void read(environment *env) {
1249    match= malloc(inlength);    match= malloc(inlength);
1250    rest= malloc(inlength);    rest= malloc(inlength);
1251    
1252    if(sscanf(env->in_string, blankform, rest)) {    if(sscanf(env->in_string, blankform, &readlength)!=EOF
1253         && readlength != -1) {
1254      ;      ;
1255    } else if(sscanf(env->in_string, intform, &itemp, rest) > 0) {    } else if(sscanf(env->in_string, intform, &itemp, &readlength) != EOF
1256                && readlength != -1) {
1257      push_int(env, itemp);      push_int(env, itemp);
1258    } else if(sscanf(env->in_string, strform, match, rest) > 0) {    } else if(sscanf(env->in_string, strform, match, &readlength) != EOF
1259                && readlength != -1) {
1260      push_cstring(env, match);      push_cstring(env, match);
1261    } else if(sscanf(env->in_string, symbform, match, rest) > 0) {    } else if(sscanf(env->in_string, symbform, match, &readlength) != EOF
1262                && readlength != -1) {
1263      push_sym(env, match);      push_sym(env, match);
1264    } else if(sscanf(env->in_string, ebrackform, rest) > 0) {    } else if(sscanf(env->in_string, ebrackform, &readlength) != EOF
1265                && readlength != -1) {
1266      pack(env); if(env->err) return;      pack(env); if(env->err) return;
1267      if(depth!=0) depth--;      if(depth != 0) depth--;
1268    } else if(sscanf(env->in_string, semicform, rest) > 0) {    } else if(sscanf(env->in_string, semicform, &readlength) != EOF
1269                && readlength != -1) {
1270      push_sym(env, ";");      push_sym(env, ";");
1271    } else if(sscanf(env->in_string, bbrackform, rest) > 0) {    } else if(sscanf(env->in_string, bbrackform, &readlength) != EOF
1272                && readlength != -1) {
1273      push_sym(env, "[");      push_sym(env, "[");
1274      depth++;      depth++;
1275    } else {    } else {
1276      free(rest);      free(env->free_string);
1277      rest= NULL;      env->in_string = env->free_string = NULL;
1278        free(match);
1279      }
1280      if ( env->in_string != NULL) {
1281        env->in_string += readlength;
1282    }    }
         
   free(env->in_string);  
   free(match);  
   
   env->in_string= rest;  
1283    
1284    if(depth)    if(depth)
1285      return read(env);      return read(env);
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