From 8afc3a35073be9ea05f997ffe69c7b334116f57c Mon Sep 17 00:00:00 2001
From: Lukas Krickl <lukas@krickl.dev>
Date: Tue, 19 Dec 2023 15:34:30 +0100
Subject: [PATCH] Fixed buffer underflow in trimend

---
 src/ulas.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/ulas.c b/src/ulas.c
index d69f2e4..f516a27 100644
--- a/src/ulas.c
+++ b/src/ulas.c
@@ -682,6 +682,9 @@ int ulas_preproclws(struct ulas_preproc *pp, const char *praw_line,
 
 void ulas_trimend(char c, char *buf, unsigned long n) {
   unsigned long buflen = strnlen(buf, n);
+  if (buflen == 0) {
+    return;
+  }
   // remove trailing new line if present
   while (buf[buflen - 1] == '\n') {
     buf[buflen - 1] = '\0';
-- 
2.30.2