diff options
| -rw-r--r-- | src/ctype/isupper.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/ctype/isupper.c b/src/ctype/isupper.c index ccc7ff23..b188dc28 100644 --- a/src/ctype/isupper.c +++ b/src/ctype/isupper.c @@ -10,7 +10,7 @@ int isupper(int c) ASSERT_REPRESENTABLE(c, 0, UCHAR_MAX, unsigned char, EOF); - return map[c] & CT_UPPER; + return c == EOF ? 0 : map[c] & CT_UPPER; } /*** |