Simplify the coverage statistics summary

The script was parsing the output from `make lcov` to extract numbers and
calculate percentages. But everything including the percentages is already
present in the output of `make lcov`, just with a slightly different
presentation. So replace all this by a simple extraction of the relevant
lines from the output of `make lcov`.

This is more robust than the previous code, which relied on `tail -n4` to
extract relevant lines, which broke when `make lcov` started to emit one
extra line at the end.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>

Author: gilles-peskine-arm

tests/scripts/basic-build-test.sh

@@ -243,35 +243,16 @@ rm -f "tests/basic-build-test-$$.ok"
     echo
 
 
-    # Step 4e - Coverage
-    echo "Coverage"
-
-    LINES_TESTED=$(tail -n4 cov-$TEST_OUTPUT|sed -n -e 's/  lines......: [0-9]*.[0-9]% (\([0-9]*\) of [0-9]* lines)/\1/p')
-    LINES_TOTAL=$(tail -n4 cov-$TEST_OUTPUT|sed -n -e 's/  lines......: [0-9]*.[0-9]% ([0-9]* of \([0-9]*\) lines)/\1/p')
-    FUNCS_TESTED=$(tail -n4 cov-$TEST_OUTPUT|sed -n -e 's/  functions..: [0-9]*.[0-9]% (\([0-9]*\) of [0-9]* functions)$/\1/p')
-    FUNCS_TOTAL=$(tail -n4 cov-$TEST_OUTPUT|sed -n -e 's/  functions..: [0-9]*.[0-9]% ([0-9]* of \([0-9]*\) functions)$/\1/p')
-    BRANCHES_TESTED=$(tail -n4 cov-$TEST_OUTPUT|sed -n -e 's/  branches...: [0-9]*.[0-9]% (\([0-9]*\) of [0-9]* branches)$/\1/p')
-    BRANCHES_TOTAL=$(tail -n4 cov-$TEST_OUTPUT|sed -n -e 's/  branches...: [0-9]*.[0-9]% ([0-9]* of \([0-9]*\) branches)$/\1/p')
-
-    LINES_PERCENT=$((1000*$LINES_TESTED/$LINES_TOTAL))
-    LINES_PERCENT="$(($LINES_PERCENT/10)).$(($LINES_PERCENT-($LINES_PERCENT/10)*10))"
-
-    FUNCS_PERCENT=$((1000*$FUNCS_TESTED/$FUNCS_TOTAL))
-    FUNCS_PERCENT="$(($FUNCS_PERCENT/10)).$(($FUNCS_PERCENT-($FUNCS_PERCENT/10)*10))"
-
-    BRANCHES_PERCENT=$((1000*$BRANCHES_TESTED/$BRANCHES_TOTAL))
-    BRANCHES_PERCENT="$(($BRANCHES_PERCENT/10)).$(($BRANCHES_PERCENT-($BRANCHES_PERCENT/10)*10))"
+    # Step 4e - Coverage report
+    echo "Coverage statistics:"
+    sed -n '1,/^Overall coverage/d; /%/p' cov-$TEST_OUTPUT
+    echo
 
     rm unit-test-$TEST_OUTPUT
     rm sys-test-$TEST_OUTPUT
     rm compat-test-$TEST_OUTPUT
     rm cov-$TEST_OUTPUT
 
-    echo "Lines Tested       : $LINES_TESTED of $LINES_TOTAL $LINES_PERCENT%"
-    echo "Functions Tested   : $FUNCS_TESTED of $FUNCS_TOTAL $FUNCS_PERCENT%"
-    echo "Branches Tested    : $BRANCHES_TESTED of $BRANCHES_TOTAL $BRANCHES_PERCENT%"
-    echo
-
     # Mark the report generation as having succeeded. This must be the
     # last thing in the report generation.
     touch "basic-build-test-$$.ok"