[seahorse] libseahorse: Add version string parsing

[Adam Schreiber <sadam src gnome org>]

commit e992586c5058b4639c422c02818bd0665030791f
Author: nobled <nobled dreamwidth org>
Date:   Wed Jan 20 23:09:47 2010 +0000

    libseahorse: Add version string parsing

 libseahorse/seahorse-util.c |   28 +++++++++++++++++++++++++++-
 libseahorse/seahorse-util.h |    4 ++++
 2 files changed, 31 insertions(+), 1 deletions(-)
---
diff --git a/libseahorse/seahorse-util.c b/libseahorse/seahorse-util.c
index acaca7e..b5c7a78 100644
--- a/libseahorse/seahorse-util.c
+++ b/libseahorse/seahorse-util.c
@@ -1598,7 +1598,33 @@ seahorse_util_determine_popup_menu_position (GtkMenu *menu, int *x, int *y,
         *x = menu_xpos;
         *y = menu_ypos;
         *push_in = TRUE;
-}            
+}
+
+/**
+ * seahorse_util_parse_version:
+ *
+ * @version: Version number string in the form xx.yy.zz
+ *
+ * Converts an (up to) four-part version number into a 64-bit
+ * unsigned integer for simple comparison.
+ *
+ * Returns: SeahorseVersion
+ **/
+SeahorseVersion
+seahorse_util_parse_version (const char *version)
+{
+	SeahorseVersion ret = 0, tmp = 0;
+	int offset = 48;
+	gchar **tokens = g_strsplit(version, ".", 5);
+	int i;
+	for (i=0; tokens[i] && offset >= 0; i++) {
+		tmp = atoi(tokens[i]);
+		ret += tmp << offset;
+		offset -= 16;
+	}
+	g_strfreev(tokens);
+	return ret;
+}
 
 /* -----------------------------------------------------------------------------
  * DNS-SD Stuff 
diff --git a/libseahorse/seahorse-util.h b/libseahorse/seahorse-util.h
index fddfe19..e863852 100644
--- a/libseahorse/seahorse-util.h
+++ b/libseahorse/seahorse-util.h
@@ -45,6 +45,8 @@ typedef enum {
     SEAHORSE_SIG_SUFFIX,
 } SeahorseSuffix;
 
+typedef guint64 SeahorseVersion;
+
 #define SEAHORSE_EXT_ASC ".asc"
 #define SEAHORSE_EXT_SIG ".sig"
 #define SEAHORSE_EXT_PGP ".pgp"
@@ -176,6 +178,8 @@ void        seahorse_util_determine_popup_menu_position  (GtkMenu *menu,
                                                            gboolean *push_in,
                                                            gpointer gdata);
 
+SeahorseVersion seahorse_util_parse_version   (const char *version);
+
 #define     seahorse_util_wait_until(expr)                \
     while (!(expr)) {                                     \
         while (g_main_context_pending(NULL) && !(expr))   \