--- /dev/null
+#ifndef _CHISE_SYSDEP_H
+#define _CHISE_SYSDEP_H
+
+#include <string.h>
+
+#ifndef HAVE_STRNLEN
+/* original in mysql, strings/strnlen.c.
+uint strnlen(register const char *s, register uint maxlen)
+{
+ const char *end= (const char *)memchr(s, '\0', maxlen);
+ return end ? (uint) (end - s) : maxlen;
+}
+*/
+static inline int
+strnlen (register const char *s, register int maxlen)
+{
+ const char *end= (const char *)memchr(s, '\0', maxlen);
+ return end ? (int) (end - s) : maxlen;
+}
+#endif
+
+#endif /* !_CHISE_SYSDEP_H */