Avoid stpncpy

It’s not worth the porting hassle, and as the glibc manual says,
“this function is generally a poor choice for processing strings”.
* admin/merge-gnulib (GNULIB_MODULES): Remove stpncpy.
* exec/configure.ac: Do not check for stpncpy.
* exec/exec.c (rpl_stpncpy, stpncpy): Remove this replacement.
(exec_0): Properly clear buffer1.  Use memcpy instead of
stpncpy to add the trailing name.  This code is clearly
still suboptimal but efficiency is not that important here
and I tried to minimize the change.
* lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate.

1 files changed, 1 insertions, 1 deletions

diff --git a/admin/merge-gnulib b/admin/merge-gnulib
index f64c0670bcf..2a713beb01a 100755
--- a/admin/merge-gnulib
+++ b/admin/merge-gnulib
@@ -45,7 +45,7 @@ GNULIB_MODULES='
   pathmax pipe2 pselect pthread_sigmask
   qcopy-acl readlink readlinkat regex
   sig2str sigdescr_np socklen stat-time std-gnu11 stdbool stdckdint stddef stdio
-  stpcpy stpncpy strnlen strnlen strtoimax symlink sys_stat sys_time
+  stpcpy strnlen strnlen strtoimax symlink sys_stat sys_time
   tempname time-h time_r time_rz timegm timer-time timespec-add timespec-sub
   update-copyright unlocked-io utimensat
   vla warnings year2038