From f319bb66252c6d32a0657c774534ba409567aa62 Mon Sep 17 00:00:00 2001
From: Chip Weinberger <weinberger.c@gmail.com>
Date: Thu, 20 Oct 2022 00:27:31 -0700
Subject: [PATCH] stack corruption for long cmdline args

---
 src/argtable3.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/argtable3.c b/src/argtable3.c
index 88632a9..543afce 100644
--- a/src/argtable3.c
+++ b/src/argtable3.c
@@ -504,11 +504,11 @@ static void arg_cat(char** pdest, const char* src, size_t* pndest) {
     char* end = dest + *pndest;
 
     /*locate null terminator of dest string */
-    while (dest < end && *dest != 0)
+    while (dest < end-1 && *dest != 0)
         dest++;
 
     /* concat src string to dest string */
-    while (dest < end && *src != 0)
+    while (dest < end-1 && *src != 0)
         *dest++ = *src++;
 
     /* null terminate dest string */