.BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */"
.B #include <string.h>
.PP
-.BI "void *memmem(const void *" haystack ", size_t " haystacklen ,
-.BI " const void *" needle ", size_t " needlelen );
+.BI "void *memmem(const void " haystack [. haystacklen "], size_t " haystacklen ,
+.BI " const void " needle [. needlelen "], size_t " needlelen );
.fi
.SH DESCRIPTION
The