scripts/test.case.reduce.sh

#!/bin/sh -

#
# Script to reduce a test case down to a smaller set by deleting
# lines.

# Start by making the file into a single file via:
#   cc -E -o newcfile.c -c inputfile.c
#
# Update the script w/ the compile command that will test for the
# failiure you're looking for.  It is at the line marked UPDATE ME.
#
# And then run the script:
#   sh test.case.reduce.sh newcfile.c
#
# After the run, it'll report how many lines were dropped, and
# the final test case will be named test.c.
#
# This isn't perfect (I know there is a better tool out there, but
# I can't remember/find it) in that it leaves blocks of code that
# are multiple lines where any one removed causes an error when
# compiling.  This can be delt w/ by hand at the end as it's a bit
# easier, but could be improved by trying to delete n lines instead
# of just 1 for increasing n (or maybe decreasing n?).
#
# In my test case of reducing, it took a 2163 line file down to
# 313 befor manually reducing it to 18 lines.

cp "$1" "test.c"

totdroppedlines=0
droppedlines=1
while [ $droppedlines -ne 0 ]; do
	droppedlines=0
	i=0
	while :; do
		linecount=$(wc -l < test.c)

		if [ $i -eq $linecount ]; then
			break
		fi

		while [ $i -lt $linecount ]; do
			# try to delete next line
			(if [ $i -gt 0 ]; then head -n $i test.c; fi; tail -n +$(($i + 2)) test.c ) > curtest.c
			#echo curtest line count: $(wc -l < curtest.c)

			# modify this function such that when the test case
			# still "fails" that it returns success.
			#
			# In this case, we are checking for a specific
			# error message.
			#
			# ====== UPDATE ME ====== 
			if arm-none-eabi-gcc -Werror=stringop-overflow=1 -mcpu=cortex-m3 -mthumb -O2 -g -Wall -Werror -c curtest.c  2>&1 | grep 'accessing 160 bytes in a region of size 32' > /dev/null; then
				echo dropping line $(($i + 1 + $droppedlines))
				droppedlines=$(($droppedlines + 1))
				mv curtest.c test.c
				break
			fi
			i=$(($i + 1))
			echo keeping line $(($i + $droppedlines))
		done
	done

	echo dropped $droppedlines lines

	totdroppedlines=$(($totdroppedlines + $droppedlines))
done

echo dropped $totdroppedlines lines in total