/[cvs]/stack/stack.c
ViewVC logotype

Diff of /stack/stack.c

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 1.54 by teddy, Fri Feb 8 00:25:57 2002 UTC revision 1.55 by teddy, Fri Feb 8 00:59:34 2002 UTC
# Line 948  extern void sx_2b(environment *env) { Line 948  extern void sx_2b(environment *env) {
948    if(env->err) return;    if(env->err) return;
949    push_int(&(env->head), a+b);    push_int(&(env->head), a+b);
950  }  }
951    
952    /* Return copy of a value */
953    value *copy_val(value *old_value){
954      stackitem *old_item, *new_item, *prev_item;
955    
956      value *new_value=malloc(sizeof(value));
957    
958      new_value->type=old_value->type;
959      new_value->refcount=0;        /* This is increased if/when this
960                                       value is referenced somewhere, like
961                                       in a stack item or a variable */
962      switch(old_value->type){
963      case integer:
964        new_value->content.val=old_value->content.val;
965        break;
966      case string:
967        (char *)(new_value->content.ptr)
968          = strdup((char *)(old_value->content.ptr));
969        break;
970      case func:
971      case symb:
972        new_value->content.ptr=old_value->content.ptr;
973        break;
974      case list:
975        new_value->content.ptr=NULL;
976    
977        prev_item=NULL;
978        old_item=(stackitem *)(old_value->content.ptr);
979    
980        while(old_item != NULL) {   /* While list is not empty */
981          new_item= malloc(sizeof(stackitem));
982          new_item->item=copy_val(old_item->item); /* recurse */
983          new_item->next=NULL;
984          if(prev_item != NULL)     /* If this wasn't the first item */
985            prev_item->next=new_item; /* point the previous item to the
986                                         new item */
987          else
988            new_value->content.ptr=new_item;
989          old_item=old_item->next;
990          prev_item=new_item;
991        }    
992        break;
993      }
994      return new_value;
995    }
996    
997    /* duplicates an item on the stack */
998    extern void dup(environment *env) {
999      if((env->head)==NULL) {
1000        printerr("Too Few Arguments");
1001        env->err=1;
1002        return;
1003      }
1004      push_val(&(env->head), copy_val(env->head->item));
1005    }
Legend:
Removed from v.1.54  
changed lines
  Added in v.1.55
root@recompile.se
 ViewVC Help
Powered by ViewVC 1.1.26