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-rw-r--r--string/strcasestr.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/string/strcasestr.c b/string/strcasestr.c
index 90ba189790..5909fe3cdb 100644
--- a/string/strcasestr.c
+++ b/string/strcasestr.c
@@ -37,8 +37,8 @@
/* Two-Way algorithm. */
#define RETURN_TYPE char *
#define AVAILABLE(h, h_l, j, n_l) \
- (!memchr ((h) + (h_l), '\0', (j) + (n_l) - (h_l)) \
- && ((h_l) = (j) + (n_l)))
+ (((j) + (n_l) <= (h_l)) || ((h_l) += __strnlen ((void*)((h) + (h_l)), 512), \
+ (j) + (n_l) <= (h_l)))
#define CHECK_EOL (1)
#define RET0_IF_0(a) if (!a) goto ret0
#define CANON_ELEMENT(c) TOLOWER (c)