X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/tripe/blobdiff_plain/3331936b5cfb724db8b70b3b8f14112be0e8b9e8..e6a3a5537973f060bbfbe9b5aecfd9c0312a1a7f:/server/tripe.h

diff --git a/server/tripe.h b/server/tripe.h
index a9a785dc..e917ddb0 100644
--- a/server/tripe.h
+++ b/server/tripe.h
@@ -1146,6 +1146,39 @@ extern void seq_reset(seqwin */*s*/);
 
 extern int seq_check(seqwin */*s*/, uint32 /*q*/, const char */*service*/);
 
+/* --- @versioncmp@ --- *
+ *
+ * Arguments:	@const char *va, *vb@ = two version strings
+ *
+ * Returns:	Less than, equal to, or greater than zero, according to
+ *		whether @va@ is less than, equal to, or greater than @vb@.
+ *
+ * Use:		Compares version number strings.
+ *
+ *		The algorithm is an extension of the Debian version
+ *		comparison algorithm.  A version number consists of three
+ *		components:
+ *
+ *		  [EPOCH :] MAIN [- SUB]
+ *
+ *		The MAIN part may contain colons or hyphens if there is an
+ *		EPOCH or SUB, respectively.  Version strings are compared
+ *		componentwise: first epochs, then main parts, and finally
+ *		subparts.
+ *
+ *		The component comparison is done as follows.  First, the
+ *		initial subsequence of nondigit characters is extracted from
+ *		each string, and these are compared lexicographically, using
+ *		ASCII ordering, except that letters precede non-letters.  If
+ *		both are the same, an initial sequence of digits is extracted
+ *		from the remaining parts of the version strings, and these
+ *		are compared numerically (an empty sequence being considered
+ *		to have the value zero).  This process is repeated until we
+ *		have a winner or until both strings are exhausted.
+ */
+
+extern int versioncmp(const char */*va*/, const char */*vb*/);
+
 /*----- That's all, folks -------------------------------------------------*/
 
 #ifdef __cplusplus