avoid potential UB when using isprint() - st - simple terminal

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---

commit af3bb68add1c40d19d0dee382009e21b0870a38f

parent 2aefa348baf4b702fdce98eb105bcba175d8283f

Author: NRK 

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 */
 }