From 3136763c15b67606c5181341b56513e25e744ab3 Mon Sep 17 00:00:00 2001
From: NRK <nrk@disroot.org>
Date: Fri, 18 Mar 2022 16:20:54 +0600
Subject: avoid potential UB when using isprint()
all the ctype.h functions' argument must be representable as an unsigned
char or as EOF, otherwise the behavior is undefined.
---
st.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/st.c b/st.c
index c71fa06..1307fdf 100644
--- a/st.c
+++ b/st.c
@@ -367,7 +367,7 @@ static const char base64_digits[] = {
char
base64dec_getc(const char **src)
{
- while (**src && !isprint(**src))
+ while (**src && !isprint((unsigned char)**src))
(*src)++;
return **src ? *((*src)++) : '='; /* emulate padding if string ends */
}
--
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