Conditionally output the server version number in psql if it doesn't

exactly match the client version number, and warn about major version
mismatches.

diff --git a/src/bin/psql/startup.c b/src/bin/psql/startup.c
index 0c3606ed25bf5f9a9df528a80adbdfc19de98fbe..5ae7b49e6e8e78cd2597e86d69076600b8ca3bfc 100644 (file)
--- a/src/bin/psql/startup.c
+++ b/src/bin/psql/startup.c
@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2000-2005, PostgreSQL Global Development Group
  *
- * $PostgreSQL: pgsql/src/bin/psql/startup.c,v 1.120 2005/07/25 17:17:41 momjian Exp $
+ * $PostgreSQL: pgsql/src/bin/psql/startup.c,v 1.121 2005/09/05 13:59:08 momjian Exp $
  */
 #include "postgres_fe.h"
 
@@ -312,13 +312,51 @@ main(int argc, char *argv[])
 
                if (!QUIET() && !pset.notty)
                {
-                       printf(_("Welcome to %s %s, the PostgreSQL interactive terminal.\n\n"
-                                                  "Type:  \\copyright for distribution terms\n"
+                       /*
+                        *      Server value for 8.12 is 80102.
+                        *      This code does not handle release numbers like
+                        *      8.112.  (Is that 8.1, version 12, or 8.11, version 2?
+                        */
+                       int             client_ver_major_int = atoi(PG_VERSION) * 100 +
+                                                                          strchr(PG_VERSION, '.')[1] - '0';
+                       int             client_ver_int = atoi(PG_VERSION) * 10000 +
+                                                                          (strchr(PG_VERSION, '.')[1] - '0') * 100 +
+                                                                          (isdigit(strchr(PG_VERSION, '.')[2]) ?
+                                                                          strchr(PG_VERSION, '.')[2] - '0' : '\0');
+
+                       if (pset.sversion / 100 != client_ver_major_int)
+                       {
+                               printf(_("WARNING:  You are connected to a server with major version %d.%d,\n"
+                                                "but your %s client is major version %d.%d.  Informational backslash\n"
+                                                "commands, like \\d, might not work properly.\n\n"),
+                                                pset.sversion / 10000, (pset.sversion / 100) % 10,
+                                                pset.progname, atoi(PG_VERSION), strchr(PG_VERSION, '.')[1] - '0');
+                       }
+
+                       if (pset.sversion != client_ver_int)
+                       {
+                               char    server_ver_str[16];
+
+                               snprintf(server_ver_str, 16, "%d.%c%c", pset.sversion / 10000,
+                                               (pset.sversion / 100) % 10 + '0',
+                                               /* print last digit? */
+                                               (pset.sversion % 10 != 0) ?
+                                               pset.sversion % 10 + '0' : '\0');
+                               
+                               printf(_("Welcome to %s, the PostgreSQL interactive terminal.\n"),
+                                                pset.progname);
+                               printf(_("%s version %s, server version %s\n\n"),
+                                                pset.progname, PG_VERSION, server_ver_str);
+                       }
+                       else
+                               printf(_("Welcome to %s %s, the PostgreSQL interactive terminal.\n\n"),
+                                        pset.progname, PG_VERSION);
+
+                       printf(_("Type:  \\copyright for distribution terms\n"
                                                   "       \\h for help with SQL commands\n"
                                                   "       \\? for help with psql commands\n"
                          "       \\g or terminate with semicolon to execute query\n"
-                                                  "       \\q to quit\n\n"),
-                                  pset.progname, PG_VERSION);
+                                                  "       \\q to quit\n\n"));
 #ifdef USE_SSL
                        printSSLInfo();
 #endif