I really hope that I haven't missed anything in this one...

From: t-ishii@sra.co.jp

Attached are patches to enhance the multi-byte support.  (patches are
against 7/18 snapshot)

* determine encoding at initdb/createdb rather than compile time

Now initdb/createdb has an option to specify the encoding. Also, I
modified the syntax of CREATE DATABASE to accept encoding option. See
README.mb for more details.

For this purpose I have added new column "encoding" to pg_database.
Also pg_attribute and pg_class are changed to catch up the
modification to pg_database.  Actually I haved added pg_database_mb.h,
pg_attribute_mb.h and pg_class_mb.h. These are used only when MB is
enabled. The reason having separate files is I couldn't find a way to
use ifdef or whatever in those files. I have to admit it looks
ugly. No way.

* support for PGCLIENTENCODING when issuing COPY command

commands/copy.c modified.

* support for SQL92 syntax "SET NAMES"

See gram.y.

* support for LATIN2-5
* add UNICODE regression test case
* new test suite for MB

New directory test/mb added.

* clean up source files

Basic idea is to have MB's own subdirectory for easier maintenance.
These are include/mb and backend/utils/mb.

src/backend/utils/mb/utftest.c

@@ -0,0 +1,33 @@
+/*
+ * testing of utf2wchar()
+ * $Id: utftest.c,v 1.1 1998/07/24 03:31:57 scrappy Exp $
+ */
+#include <regex/regex.h>
+#include <regex/utils.h>
+#include <regex/regex2.h>
+
+#include <regex/pg_wchar.h>
+
+main()
+{
+  /* Example 1 from RFC2044 */
+  char utf1[] = {0x41,0xe2,0x89,0xa2,0xce,0x91,0x2e,0};
+  /* Example 2 from RFC2044 */
+  char utf2[] = {0x48,0x69,0x20,0x4d,0x6f,0x6d,0x20,0xe2,0x98,0xba,0x21,0};
+  /* Example 3 from RFC2044 */
+  char utf3[] = {0xe6,0x97,0xa5,0xe6,0x9c,0xac,0xe8,0xaa,0x9e,0};
+  char *utf[] = {utf1,utf2,utf3};
+  pg_wchar ucs[128];
+  pg_wchar *p;
+  int i;
+
+  for (i=0;i<sizeof(utf)/sizeof(char *);i++) {
+    pg_utf2wchar(utf[i],ucs);
+    p = ucs;
+    while(*p) {
+      printf("%04x ",*p);
+      p++;
+    }
+    printf("\n");
+  }
+}