From 7a5b475c3f48038adc7f627ba28546bf0d92b5ab Mon Sep 17 00:00:00 2001
From: UnionSystems <144504380+UnionSystems@users.noreply.github.com>
Date: Sun, 7 Dec 2025 20:40:10 +0100
Subject: [PATCH] Fix isspace undefined behaviour

This commit fixes isspace undefined behaviour when a value of a single signed char in input string exceeds 127.
---
 pdfgen.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pdfgen.c b/pdfgen.c
index 18df69d..dad1cad 100644
--- a/pdfgen.c
+++ b/pdfgen.c
@@ -1903,7 +1903,7 @@ static const char *find_word_break(const char *string)
     if (!string)
         return NULL;
     /* Skip over the actual word */
-    while (*string && !isspace(*string))
+    while (*string && !isspace((unsigned char)*string))
         string++;
 
     return string;