Fix undefined behaviour. * lib/bitrotate.h (rotl16, rotr16, rotl8, rotr8): Case x to 'unsigned int', to avoid shift operations on 'int'. * lib/xmemdup0.c (xmemdup0): Don't invoke memcpy with a zero size. * tests/test-count-leading-zeros.c (main): Use a random number that has as many bits as TYPE, not only 2*15 or 2*31 bits. * tests/test-count-trailing-zeros.c (main): Likewise. * tests/test-count-one-bits.c (main): Likewise. * tests/test-memmem.c: Don't include "null-ptr.h". (main): Use zerosize_ptr() instead of null_ptr(). * modules/memmem-tests (Files): Remove tests/null-ptr.h.

--- test-driver.bak	2019-01-23 03:22:06.672283432 +0100
+++ test-driver	2019-01-23 04:23:21.201060757 +0100
@@ -104,7 +104,10 @@
 trap "st=143; $do_exit" 15

 # Test script is run here.
-"$@" >$log_file 2>&1
+case "$1" in
+  *.sh) sh "$@" >$log_file 2>&1 ;;
+  *)    "$@" >$log_file 2>&1 ;;
+esac
 estatus=$?

 if test $enable_hard_errors = no && test $estatus -eq 99; then