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-rw-r--r--src/ctype/isblank.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/ctype/isblank.c b/src/ctype/isblank.c
index e546e6fa..b9f81f59 100644
--- a/src/ctype/isblank.c
+++ b/src/ctype/isblank.c
@@ -16,6 +16,8 @@ int isblank(int c)
return c == EOF ? 0 : map[c] & CT_BLANK;
}
+__check_1(int, 0, isblank, int)
+
/***
tests whether a character is a of the character class CCLASS(blank) in the
current locale.