fixes for glibc time/gettimeofday issue; fix issue with history file containing one line too few if saving timestamps; fix for signal arriving while displaying readline completions

tests/history.right

@@ -297,3 +297,47 @@ out of range 4
     7  echo 9
     8  echo 10
     5  echo 10
+$ 1
+$ 2
+$ 3
+$ exit
+       6
+$ 1
+$ 2
+$ 3
+$ 4
+$ 5
+$ exit
+       6
+$ 1
+$ 2
+$ exit
+       4
+$ e 1
+$ e 2
+$ e 3
+$ exit
+       3
+e 1
+e 2
+e 3
+$ x 1
+$ x 2
+$ x 3
+$ x 4
+$ x 5
+$ exit
+       3
+x 3
+x 4
+x 5
+$ y 1
+$ y 2
+$ exit
+       2
+y 1
+y 2
+$ 1
+$ 2
+$ exit
+       0

tests/history.tests

@@ -131,3 +131,4 @@ ${THIS_SH} ./history3.sub
 ${THIS_SH} ./history4.sub
 ${THIS_SH} ./history5.sub
 ${THIS_SH} ./history6.sub
+${THIS_SH} ./history7.sub

tests/history7.sub

@@ -0,0 +1,73 @@
+#   This program is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# test history file truncation for various values of $HISTFILESIZE
+
+: ${THIS_SH:=./bash}
+: ${TMPDIR:=/var/tmp}
+
+export HISTTIMEFORMAT=
+export HISTFILESIZE=3
+export HISTFILE=$TMPDIR/hist-$$
+export PS1='$ '
+
+rm -f $HISTFILE
+
+# exactly the number of lines
+${THIS_SH} --norc -in <<<$'1\n2\n3' 
+wc -l < $HISTFILE
+
+rm -f $HISTFILE
+
+# truncating to fewer lines
+${THIS_SH} --norc -in <<<$'1\n2\n3\n4\n5' 
+wc -l < $HISTFILE
+
+rm -f $HISTFILE
+
+# the history file contains fewer lines than $HISTFILESIZE
+${THIS_SH} --norc -in <<<$'1\n2' 
+wc -l < $HISTFILE
+
+rm -f $HISTFILE
+
+# now we try it without timestamps
+unset HISTTIMEFORMAT
+
+# exactly the number of lines
+${THIS_SH} --norc -in <<<$'e 1\ne 2\ne 3' 
+wc -l < $HISTFILE
+cat $HISTFILE
+
+rm -f $HISTFILE
+
+# truncating to fewer lines
+${THIS_SH} --norc -in <<<$'x 1\nx 2\nx 3\nx 4\nx 5' 
+wc -l < $HISTFILE
+cat $HISTFILE
+
+rm -f $HISTFILE
+
+# the history file contains fewer lines than $HISTFILESIZE
+${THIS_SH} --norc -in <<<$'y 1\ny 2' 
+wc -l < $HISTFILE
+cat $HISTFILE
+
+rm -f $HISTFILE
+
+# we want to truncate the history file to zero length
+HISTFILESIZE=0
+${THIS_SH} --norc -in <<<$'1\n2' 
+wc -l < $HISTFILE
+
+rm -f $HISTFILE