From 9b3459ca129ffe680f8e8c8caeb00167c7180a22 Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Thu, 2 Dec 2021 07:42:45 -0800
Subject: tuples: check length argument.

* lib.c (tuples): Check that n argument giving tuple size is a
is a positive integer.

* tests/012/seql.tl: Test case added.
---
 lib.c            | 4 ++++
 tests/012/seq.tl | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/lib.c b/lib.c
index 0fdc8ef0..7f797bb1 100644
--- a/lib.c
+++ b/lib.c
@@ -3575,8 +3575,12 @@ static val tuples_func(val n, val lcons)
 
 val tuples(val n, val seq, val fill)
 {
+  val self = lit("tuples");
   seq = nullify(seq);
 
+  if (!plusp(n) || !integerp(n))
+    uw_throwf(error_s, lit("~a: positive integer required, not ~s"), self, n, nao);
+
   if (!seq)
     return nil;
 
diff --git a/tests/012/seq.tl b/tests/012/seq.tl
index d434ad52..d27adcef 100644
--- a/tests/012/seq.tl
+++ b/tests/012/seq.tl
@@ -212,3 +212,6 @@
   [separate chr-isalpha "a1b2c3d4"] ("abcd" "1234")
   [separate chrp "a1b2c3d4"] ("a1b2c3d4" "")
   [separate integerp "a1b2c3d4"] ("" "a1b2c3d4"))
+
+(mtest
+  (tuples 0 '(1 2 3)) :error)
-- 
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