2 files changed, 39 insertions, 0 deletions
diff --git a/liblali.c b/liblali.c
index be8eed4..c2ec974 100644
--- a/liblali.c
+++ b/liblali.c
@@ -1072,6 +1072,41 @@ Object *say(Object *object, GC_PARAM) {
   return result;
 }
 
+bool isSplittedNumber(Object *lnum) {
+  // check the number prefix
+  if (((lnum)->car->type != TYPE_SYMBOL ||
+        (strcmp((lnum)->car->string, "+") &&
+         strcmp((lnum)->car->string, "-"))))
+    return false;
+
+  // check the size
+  Object *list = lnum;
+  for (int i = 0; i <= 3; i++)
+    if (list->cdr == nil && i == 0) return false;
+    else if (list->cdr == nil && i <= 2) break;
+    else if (i == 3) return false;
+    else list = list->cdr;
+
+  // check the elements of each sub-list is in between +0 and +9
+  list = lnum->cdr;
+  Object *lcar = nil;
+  for (;;) {
+    lcar = list->car;
+    for (;;) {
+      if (lcar->car->type != TYPE_NUMBER)
+        return false;
+
+      if (lcar->cdr == nil) break;
+      lcar = lcar->cdr;
+    }
+
+    if (list->cdr == nil) break;
+    list = list->cdr;
+  }
+
+  return true;
+}
+
 Object *primitiveJoin(Object **args, GC_PARAM) {
   // check if there are () arguments
   if ((*args)->car == nil)
diff --git a/liblali.h b/liblali.h
index e50cb24..ad44734 100644
--- a/liblali.h
+++ b/liblali.h
@@ -333,6 +333,10 @@ Object *primitiveGreater(Object **args, GC_PARAM);
 
 bool hasADot(char *string);
 
+Object *say(Object *object, GC_PARAM);
+
+bool isSplittedNumber(Object *lnum);
+
 Object *primitiveJoin(Object **args, GC_PARAM);
 
 Object *primitiveSplit(Object **args, GC_PARAM);