/[cvs]/stack/stack.c
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Diff of /stack/stack.c

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revision 1.76 by masse, Wed Feb 13 00:47:36 2002 UTC revision 1.78 by teddy, Thu Feb 14 05:21:06 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 531  extern void eval(environment *env) Line 533  extern void eval(environment *env)
533    
534  /* Reverse (flip) a list */  /* Reverse (flip) a list */
535  extern void rev(environment *env){  extern void rev(environment *env){
536    stackitem *item, *temp, *prev= NULL;    stackitem *old_head, *new_head, *item;
537    
538    if((env->head)==NULL) {    if((env->head)==NULL) {
539      printerr("Too Few Arguments");      printerr("Too Few Arguments");
# Line 545  extern void rev(environment *env){ Line 547  extern void rev(environment *env){
547      return;      return;
548    }    }
549    
550    item= (stackitem *)(env->head->item->content.ptr);    old_head=(stackitem *)(env->head->item->content.ptr);
551    while(item->next!=NULL){    new_head=NULL;
552      temp= item->next;    while(old_head != NULL){
553      item->next= prev;      item=old_head;
554      prev= item;      old_head=old_head->next;
555      item= temp;      item->next=new_head;
556        new_head=item;
557    }    }
558    item->next= prev;    env->head->item->content.ptr=new_head;
   
   env->head->item->content.ptr=item;  
559  }  }
560    
561  /* Make a list. */  /* Make a list. */
# Line 717  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        if (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 745  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 767  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 1177  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 1194  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 1202  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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