smatch_scripts/new_bugs.sh

   1 #!/bin/bash
   2
   3 new=$1
   4 old=$2
   5
   6 if [ "$old" = "" ] ; then
   7     echo "usage:  $0 <new file> <old file>"
   8     exit 1
   9 fi
  10
  11 #
  12 # If the $old and $new are very similar then we can
  13 # filter out a lot of bug just by doing a diff.
  14 #
  15 # But the line numbers change quite frequently so
  16 # really we only want to see if the line numbers
  17 # have changed inside the function.
  18 # The 42 in this message:
  19 # file.c +123 some_func(42) warn: blah blah blah
  20 #
  21
  22 IFS="
  23 "
  24 for err in $(diff -u $old $new | cut -b 2- | egrep '(warn|error|warning):') ; do
  25
  26     # we are only interested in the last chunk.
  27     # "some_func(42) warn: blah blah blah"
  28     last=$(echo $err | cut -d ' ' -f 2-)
  29
  30     # There are some error message which include a second
  31     # line number so we crudely chop that off.
  32     last=$(echo $last | sed -e 's/line .*//')
  33
  34     if ! grep -Fq "$last" $old ; then
  35         echo $err
  36     fi
  37 done