About Debain Bug #532541

[Kai YU]

Hi, recently I noticed the Debain Bug #532541(
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=532541). The problem
reported still exists in grep-2.7. I debugged the program, and found it was
introduce by the change of grep-2.5.3(
http://git.savannah.gnu.org/cgit/grep.git/commit/?id=143f885e02eb98ab88a1f18e0aa8d069781bc813).
The failure-inducing change is:

- if (only_matching)
+}
+
+static void
+prline (char const *beg, char const *lim, int sep)
+{
+ if (!only_matching)
+ print_line_head(beg, lim, sep);
+ else

Notice that the predicate if (only_matching) is changed to if
(!only_matching). Although just withdraw the change may also cause problems,
I wish somebody could pay attention to this problem and solve it.