useless-if-before-free: show how to remove braced useless free, too

* build-aux/useless-if-before-free: still only in a comment, though.

diff --git a/ChangeLog b/ChangeLog
index 069ae1f..e4c9bf6 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2009-04-07  Jim Meyering  <meyering@redhat.com>
+
+       useless-if-before-free: show how to remove braced useless free, too
+       * build-aux/useless-if-before-free: still only in a comment, though.
+
 2009-04-07  Reuben Thomas  <rrt@sc3d.org>
 
        maint.mk: import changes to syntax-check macros from coreutils

diff --git a/build-aux/useless-if-before-free b/build-aux/useless-if-before-free
index 696c621..29d4917 100755 (executable)
--- a/build-aux/useless-if-before-free
+++ b/build-aux/useless-if-before-free
@@ -4,7 +4,7 @@
 # Also detect "if (NULL != p) free (p);".
 # And with 0 in place of NULL.
 
-my $VERSION = '2009-01-28 08:23'; # UTC
+my $VERSION = '2009-04-07 08:05'; # UTC
 # The definition above must lie within the first 8 lines in order
 # for the Emacs time-stamp write hook (at end) to update it.
 # If you change this file with Emacs, please let the write hook
@@ -179,8 +179,14 @@ useless-if-before-free -l $(lid -knone free) | xargs -0 \
   perl -0x3b -pi -e \
    's/\bif\s*\(\s*(\S+?)(?:\s*!=\s*NULL)?\s*\)\s+(free\s*\((?:\s*\([^)]+\))?\s*\1\s*\))/$2/s'
 
-# Or, with git:
-git ls-files -z |xargs -0 perl -0x3b -pi -e '...'
+# Use the following to remove redundant uses of kfree inside braces.
+# Note that -0777 puts perl in slurp-whole-file mode;
+# but we have plenty of memory, these days...
+free=kfree
+git grep -l -z "$free *(" \
+  | xargs -0 useless-if-before-free -l --name="$free" \
+  | xargs -0 perl -0777 -pi -e \
+     's/\bif\s*\(\s*(\S+?)(?:\s*!=\s*NULL)?\s*\)\s*\{\s*('"$free"'\s*\((?:\s*\([^)]+\))?\s*\1\s*\);)\s*\}[^\n]*$/$2/gms'
 
 Be careful that the result of the above transformation is valid.
 If the matched string is followed by "else", then obviously, it won't be.