Fix argument range of ctype functions.

secrethcb · Jun 21, 2016 · 433a84d · 433a84d
1 parent 3bf4a20
commit 433a84d
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/libarchive_fe/passphrase.c b/libarchive_fe/passphrase.c
@@ -237,11 +237,11 @@ readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
 			if (p < end) {
 				if ((flags & RPP_SEVENBIT))
 					ch &= 0x7f;
-				if (isalpha(ch)) {
+				if (isalpha((unsigned char)ch)) {
 					if ((flags & RPP_FORCELOWER))
-						ch = (char)tolower(ch);
+						ch = (char)tolower((unsigned char)ch);
 					if ((flags & RPP_FORCEUPPER))
-						ch = (char)toupper(ch);
+						ch = (char)toupper((unsigned char)ch);
 				}
 				*p++ = ch;
 			}