build openbsd memmem implementation for explicit_bzero test

memmem is not always available, and not all memmem's work the same way

ok beck@ guenther@

1 files changed, 3 insertions, 0 deletions

diff --git a/include/string.h b/include/string.h
index acdde6c..6277247 100644
--- a/include/string.h
+++ b/include/string.h
@@ -22,4 +22,7 @@ int timingsafe_bcmp(const void *b1, const void *b2, size_t n);
 
 int timingsafe_memcmp(const void *b1, const void *b2, size_t len);
 
+void * memmem(const void *big, size_t big_len, const void *little,
+        size_t little_len);
+
 #endif