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-rw-r--r--src/ctype/isgraph.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/ctype/isgraph.c b/src/ctype/isgraph.c
index 49de9c1f..3a8f2871 100644
--- a/src/ctype/isgraph.c
+++ b/src/ctype/isgraph.c
@@ -10,7 +10,7 @@ int isgraph(int c)
ASSERT_REPRESENTABLE(c, 0, UCHAR_MAX, unsigned char, EOF);
- return map[c] & CT_GRAPH;
+ return c == EOF ? 0 : map[c] & CT_GRAPH;
}
/***