# HG changeset patch
# User Paul Eggert <eggert@cs.ucla.edu>
# Date 1291267556 28800
# Node ID cc15a32c0446f39489fd02187df1f9b870ad6bf5
# Parent  4354812074756c72b813c5f5422520176325f374
utimecmp: fine-grained src to nearby coarse-grained dest

* lib/utimecmp.c (utimecmp): When UTIMECMP_TRUNCATE_SOURCE is set,
and the source is on a file system with higher-resolution time
stamps, than the destination, and _PC_TIMESTAMP_RESOLUTION does
not work, and the time stamps are close together, the algorithm to
determine the exact resolution from the read-back mtime was buggy:
it had a "!=" where it should have had an "==".  This bug has been
in the code ever since it was introduced to gnulib.
Problem reported by Dan Jacobson in
<http://debbugs.gnu.org/cgi/bugreport.cgi?bug=7529>.

diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+2010-12-01  Paul Eggert  <eggert@cs.ucla.edu>
+
+	utimecmp: fine-grained src to nearby coarse-grained dest
+
+	* lib/utimecmp.c (utimecmp): When UTIMECMP_TRUNCATE_SOURCE is set,
+	and the source is on a file system with higher-resolution time
+	stamps, than the destination, and _PC_TIMESTAMP_RESOLUTION does
+	not work, and the time stamps are close together, the algorithm to
+	determine the exact resolution from the read-back mtime was buggy:
+	it had a "!=" where it should have had an "==".  This bug has been
+	in the code ever since it was introduced to gnulib.
+	Problem reported by Dan Jacobson in
+	<http://debbugs.gnu.org/cgi/bugreport.cgi?bug=7529>.
+
 2010-11-30  Bruno Haible  <bruno@clisp.org>
 
 	strerror_r-posix: Fix autoconf test.
diff --git a/lib/utimecmp.c b/lib/utimecmp.c
--- a/lib/utimecmp.c
+++ b/lib/utimecmp.c
@@ -325,7 +325,7 @@
 
                 res = SYSCALL_RESOLUTION;
 
-                for (a /= res; a % 10 != 0; a /= 10)
+                for (a /= res; a % 10 == 0; a /= 10)
                   {
                     if (res == BILLION)
                       {