st

commit af3bb68add1c40d19d0dee382009e21b0870a38f (patch)
parent 2aefa348baf4b702fdce98eb105bcba175d8283f
Author: NRK <nrk@disroot.org>
Date:   Fri, 18 Mar 2022 16:20:54 +0600

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.

Diffstat:
M
st.c
 | 
2
+-

1 file changed, 1 insertion(+), 1 deletion(-)
diff --git 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 */
 }