branches/zip: btr_page_get_sure_split_rec(): Rewrite the

for (;;) { ... if (condition) { ... return }} loop as
do { ... } while (!condition); ... return.

On compressed pages, return NULL if incl_data > free_space.

btr/btr0btr.c

@@ -1364,7 +1364,7 @@ btr_page_get_sure_split_rec(
 	otherwise the last included record will be the first on the right
 	half page */
 
-	for (;;) {
+	do {
 		/* Decide the next record to include */
 		if (rec == ins_rec) {
 			rec = NULL;	/* NULL denotes that tuple is
@@ -1386,12 +1386,10 @@ btr_page_get_sure_split_rec(
 		}
 
 		n++;
+	} while (incl_data + page_dir_calc_reserved_space(n)
+		 < total_space / 2);
 
-		if (incl_data + page_dir_calc_reserved_space(n)
-		    >= total_space / 2) {
-
-			if (incl_data + page_dir_calc_reserved_space(n)
-			    <= free_space) {
+	if (incl_data + page_dir_calc_reserved_space(n) <= free_space) {
 		/* The next record will be the first on
 		the right half page if it is not the
 		supremum record of page */
@@ -1409,6 +1407,8 @@ btr_page_get_sure_split_rec(
 		if (!page_rec_is_supremum(next_rec)) {
 			rec = next_rec;
 		}
+	} else if (page_zip) {
+		rec = NULL;
 	}
 
 func_exit:
@@ -1416,8 +1416,6 @@ func_exit:
 		mem_heap_free(heap);
 	}
 	return(rec);
-		}
-	}
 }
 
 /*****************************************************************