/[cvs]/stack/stack.c
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revision 1.73 by masse, Tue Feb 12 23:16:56 2002 UTC revision 1.79 by masse, Thu Feb 14 12:01:58 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 606  extern void pack(environment *env) Line 593  extern void pack(environment *env)
593    pack->content.ptr= temp;    pack->content.ptr= temp;
594    pack->refcount= 1;    pack->refcount= 1;
595    
596    temp= malloc(sizeof(stackitem));    push_val(env, pack);
   temp->item= pack;  
   
   push(env, temp);  
597    rev(env);    rev(env);
598  }  }
599    
# Line 734  extern void def(environment *env) Line 718  extern void def(environment *env)
718    toss(env); toss(env);    toss(env); toss(env);
719  }  }
720    
721    extern void clear(environment *);
722    void forget_sym(symbol **);
723    
724  /* Quit stack. */  /* Quit stack. */
725  extern void quit(environment *env)  extern void quit(environment *env)
726  {  {
727      long i;
728    
729      clear(env);
730      if (env->err) return;
731      for(i= 0; i<HASHTBLSIZE; i++) {
732        while(env->symbols[i]!= NULL) {
733          forget_sym(&(env->symbols[i]));
734          env->symbols[i]= NULL;
735        }
736      }
737    exit(EXIT_SUCCESS);    exit(EXIT_SUCCESS);
738  }  }
739    
# Line 762  extern void words(environment *env) Line 759  extern void words(environment *env)
759    }    }
760  }  }
761    
762    /* Internal forget function */
763    void forget_sym(symbol **hash_entry) {
764      symbol *temp;
765    
766      temp= *hash_entry;
767      *hash_entry= (*hash_entry)->next;
768      
769      if(temp->val!=NULL) {
770        free_val(temp->val);
771      }
772      free(temp->id);
773      free(temp);
774    }
775    
776  /* Forgets a symbol (remove it from the hash table) */  /* Forgets a symbol (remove it from the hash table) */
777  extern void forget(environment *env)  extern void forget(environment *env)
778  {  {
779    char* sym_id;    char* sym_id;
780    stackitem *stack_head= env->head;    stackitem *stack_head= env->head;
   symbol **hash_entry, *temp;  
781    
782    if(stack_head==NULL) {    if(stack_head==NULL) {
783      printerr("Too Few Arguments");      printerr("Too Few Arguments");
# Line 784  extern void forget(environment *env) Line 794  extern void forget(environment *env)
794    sym_id= ((symbol*)(stack_head->item->content.ptr))->id;    sym_id= ((symbol*)(stack_head->item->content.ptr))->id;
795    toss(env);    toss(env);
796    
797    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);  
798  }  }
799    
800  /* Returns the current error number to the stack */  /* Returns the current error number to the stack */
# Line 1144  extern void sx_666f72(environment *env) Line 1146  extern void sx_666f72(environment *env)
1146  /* 'to' */  /* 'to' */
1147  extern void to(environment *env) {  extern void to(environment *env) {
1148    int i, start, ending;    int i, start, ending;
1149      stackitem *temp_head;
1150      value *temp_val;
1151        
1152    if((env->head)==NULL || env->head->next==NULL) {    if((env->head)==NULL || env->head->next==NULL) {
1153      printerr("Too Few Arguments");      printerr("Too Few Arguments");
# Line 1163  extern void to(environment *env) { Line 1167  extern void to(environment *env) {
1167    start= env->head->item->content.val;    start= env->head->item->content.val;
1168    toss(env); if(env->err) return;    toss(env); if(env->err) return;
1169    
1170    push_sym(env, "[");    temp_head= env->head;
1171      env->head= NULL;
1172    
1173    if(ending>=start) {    if(ending>=start) {
1174      for(i= start; i<=ending; i++)      for(i= ending; i>=start; i--)
1175        push_int(env, i);        push_int(env, i);
1176    } else {    } else {
1177      for(i= start; i>=ending; i--)      for(i= ending; i<=start; i++)
1178        push_int(env, i);        push_int(env, i);
1179    }    }
1180    
1181    pack(env); if(env->err) return;    temp_val= malloc(sizeof(value));
1182      temp_val->content.ptr= env->head;
1183      temp_val->refcount= 1;
1184      temp_val->type= list;
1185      env->head= temp_head;
1186      push_val(env, temp_val);
1187  }  }
1188    
1189  /* Read a string */  /* Read a string */
# Line 1186  extern void readline(environment *env) { Line 1196  extern void readline(environment *env) {
1196    
1197  /* Read a value and place on stack */  /* Read a value and place on stack */
1198  extern void read(environment *env) {  extern void read(environment *env) {
1199    const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%[\001-\377]";    const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%n";
1200    const char strform[]= "\"%[^\"]\"%[\001-\377]";    const char strform[]= "\"%[^\"]\"%n";
1201    const char intform[]= "%i%[\001-\377]";    const char intform[]= "%i%n";
1202    const char blankform[]= "%*[ \t]%[\001-\377]";    const char blankform[]= "%*[ \t]%n";
1203    const char ebrackform[]= "%*1[]]%[\001-\377]";    const char ebrackform[]= "%*1[]]%n";
1204    const char semicform[]= "%*1[;]%[\001-\377]";    const char semicform[]= "%*1[;]%n";
1205    const char bbrackform[]= "%*1[[]%[\001-\377]";    const char bbrackform[]= "%*1[[]%n";
1206    
1207    int itemp;    int itemp, readlength= -1;
1208    static int depth= 0;    static int depth= 0;
1209    char *rest, *match;    char *rest, *match;
1210    size_t inlength;    size_t inlength;
# Line 1203  extern void read(environment *env) { Line 1213  extern void read(environment *env) {
1213      readline(env); if(env->err) return;      readline(env); if(env->err) return;
1214            
1215      env->in_string= malloc(strlen(env->head->item->content.ptr)+1);      env->in_string= malloc(strlen(env->head->item->content.ptr)+1);
1216        env->free_string= env->in_string; /* Save the original pointer */
1217      strcpy(env->in_string, env->head->item->content.ptr);      strcpy(env->in_string, env->head->item->content.ptr);
1218      toss(env); if(env->err) return;      toss(env); if(env->err) return;
1219    }    }
# Line 1211  extern void read(environment *env) { Line 1222  extern void read(environment *env) {
1222    match= malloc(inlength);    match= malloc(inlength);
1223    rest= malloc(inlength);    rest= malloc(inlength);
1224    
1225    if(sscanf(env->in_string, blankform, rest)) {    if(sscanf(env->in_string, blankform, &readlength)!=EOF
1226         && readlength != -1) {
1227      ;      ;
1228    } else if(sscanf(env->in_string, intform, &itemp, rest) > 0) {    } else if(sscanf(env->in_string, intform, &itemp, &readlength) != EOF
1229                && readlength != -1) {
1230      push_int(env, itemp);      push_int(env, itemp);
1231    } else if(sscanf(env->in_string, strform, match, rest) > 0) {    } else if(sscanf(env->in_string, strform, match, &readlength) != EOF
1232                && readlength != -1) {
1233      push_cstring(env, match);      push_cstring(env, match);
1234    } else if(sscanf(env->in_string, symbform, match, rest) > 0) {    } else if(sscanf(env->in_string, symbform, match, &readlength) != EOF
1235                && readlength != -1) {
1236      push_sym(env, match);      push_sym(env, match);
1237    } else if(sscanf(env->in_string, ebrackform, rest) > 0) {    } else if(sscanf(env->in_string, ebrackform, &readlength) != EOF
1238                && readlength != -1) {
1239      pack(env); if(env->err) return;      pack(env); if(env->err) return;
1240      if(depth!=0) depth--;      if(depth != 0) depth--;
1241    } else if(sscanf(env->in_string, semicform, rest) > 0) {    } else if(sscanf(env->in_string, semicform, &readlength) != EOF
1242                && readlength != -1) {
1243      push_sym(env, ";");      push_sym(env, ";");
1244    } else if(sscanf(env->in_string, bbrackform, rest) > 0) {    } else if(sscanf(env->in_string, bbrackform, &readlength) != EOF
1245                && readlength != -1) {
1246      push_sym(env, "[");      push_sym(env, "[");
1247      depth++;      depth++;
1248    } else {    } else {
1249      free(rest);      free(env->free_string);
1250      rest= NULL;      env->in_string = env->free_string = NULL;
1251        free(match);
1252      }
1253      if ( env->in_string != NULL) {
1254        env->in_string += readlength;
1255    }    }
         
   free(env->in_string);  
   free(match);  
   
   env->in_string= rest;  
1256    
1257    if(depth)    if(depth)
1258      return read(env);      return read(env);
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