Add PQserverVersion() to libpq to provide more-convenient access to

the server version number.  This commit also removes bogus DOS line
endings from libpqddll.def.

Greg Sabino Mullane

doc/src/sgml/libpq.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/libpq.sgml,v 1.157 2004/06/08 13:49:22 momjian Exp $
+$PostgreSQL: pgsql/doc/src/sgml/libpq.sgml,v 1.158 2004/08/11 18:06:00 tgl Exp $
 -->
 
  <chapter id="libpq">
@@ -892,6 +892,24 @@ The 3.0 protocol will normally be used when communicating with
 only protocol 2.0.  (Protocol 1.0 is obsolete and not supported by <application>libpq</application>.)
 </para>
 </listitem>
+</varlistentry>
+
+<varlistentry>
+<term><function>PQserverVersion</function><indexterm><primary>PQserverVersion</></></term>
+<listitem>
+<para>
+         Returns an integer representing the backend version.
+<synopsis>
+int PQserverVersion(const PGconn *conn);
+</synopsis>
+Applications may use this to determine the version of the database server they
+are connected to. The number is formed by converting the major, minor, and
+revision numbers into two digit numbers and appending them together. For
+example, version 7.4.2 will be returned as 70402, and version 8.1 will be
+returned as 80100 (leading zeroes are not shown).  Zero is returned if the
+connection is bad.
+</para>
+</listitem>
 </varlistentry>
 
     <varlistentry>

src/interfaces/libpq/blibpqdll.def

@@ -113,6 +113,8 @@ EXPORTS
     _PQfformat               @ 109
     _PQexecPrepared          @ 110
     _PQsendQueryPrepared     @ 111
+    _PQdsplen                @ 112
+    _PQserverVersion         @ 113
 
 ; Aliases for MS compatible names
     PQconnectdb             = _PQconnectdb            
@@ -226,3 +228,5 @@ EXPORTS
     PQfformat               = _PQfformat
     PQexecPrepared          = _PQexecPrepared
     PQsendQueryPrepared     = _PQsendQueryPrepared
+    PQdsplen                = _PQdsplen
+    PQserverVersion         = _PQserverVersion

src/interfaces/libpq/fe-connect.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/interfaces/libpq/fe-connect.c,v 1.278 2004/07/12 14:23:28 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/interfaces/libpq/fe-connect.c,v 1.279 2004/08/11 18:06:01 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -2872,6 +2872,16 @@ PQprotocolVersion(const PGconn *conn)
 	return PG_PROTOCOL_MAJOR(conn->pversion);
 }
 
+int
+PQserverVersion(const PGconn *conn)
+{
+	if (!conn)
+		return 0;
+	if (conn->status == CONNECTION_BAD)
+		return 0;
+	return conn->sversion;
+}
+
 char *
 PQerrorMessage(const PGconn *conn)
 {

src/interfaces/libpq/libpq-fe.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/interfaces/libpq/libpq-fe.h,v 1.104 2004/03/24 03:44:59 momjian Exp $
+ * $PostgreSQL: pgsql/src/interfaces/libpq/libpq-fe.h,v 1.105 2004/08/11 18:06:01 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -248,6 +248,7 @@ extern PGTransactionStatusType PQtransactionStatus(const PGconn *conn);
 extern const char *PQparameterStatus(const PGconn *conn,
 				  const char *paramName);
 extern int	PQprotocolVersion(const PGconn *conn);
+extern int  PQserverVersion(const PGconn *conn);
 extern char *PQerrorMessage(const PGconn *conn);
 extern int	PQsocket(const PGconn *conn);
 extern int	PQbackendPID(const PGconn *conn);

src/interfaces/libpq/libpqddll.def

@@ -113,3 +113,5 @@ EXPORTS
     PQfformat               @ 109
     PQexecPrepared          @ 110
     PQsendQueryPrepared     @ 111
+    PQdsplen                @ 112
+    PQserverVersion         @ 113

src/interfaces/libpq/libpqdll.def

@@ -114,3 +114,4 @@ EXPORTS
     PQexecPrepared          @ 110
     PQsendQueryPrepared     @ 111
     PQdsplen                @ 112
+    PQserverVersion         @ 113