[libvirt] [PATCH] fix virParseVersionString with linux 3.0

[Scott Moser]

linux 3.0 has no micro version number, and that is causing problems
for virParseVersionString.  The patch below should allow for:
  major
  major.minor
  major.minor.micro

If major or minor are not present they just default to zero.
We found this in Ubuntu (https://bugs.launchpad.net/bugs/802977)

diff --git a/src/util/util.c b/src/util/util.c
index 463d2b8..01848a1 100644
--- a/src/util/util.c
+++ b/src/util/util.c
@@ -1598,17 +1598,17 @@ virParseNumber(const char **str)
 int
 virParseVersionString(const char *str, unsigned long *version)
 {
-    unsigned int major, minor, micro;
+    unsigned int major, minor=0, micro=0;
     char *tmp;

-    if (virStrToLong_ui(str, &tmp, 10, &major) < 0 || *tmp != '.')
+    if (virStrToLong_ui(str, &tmp, 10, &major) < 0)
         return -1;

-    if (virStrToLong_ui(tmp + 1, &tmp, 10, &minor) < 0 || *tmp != '.')
-        return -1;
+    if ((*tmp == '.') && virStrToLong_ui(tmp + 1, &tmp, 10, &minor) < 0)
+            return -1;

-    if (virStrToLong_ui(tmp + 1, &tmp, 10, &micro) < 0)
-        return -1;
+    if ((*tmp == '.') && virStrToLong_ui(tmp + 1, &tmp, 10, &micro) < 0)
+            return -1;

     *version = 1000000 * major + 1000 * minor + micro;