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utf8_and_cyrillic.c
/*-------------------------------------------------------------------------
 *
 *      UTF8 and Cyrillic
 *
 * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * IDENTIFICATION
 *      $PostgreSQL: pgsql/src/backend/utils/mb/conversion_procs/utf8_and_cyrillic/utf8_and_cyrillic.c,v 1.24 2009/02/10 19:29:39 petere Exp $
 *
 *-------------------------------------------------------------------------
 */

#include "postgres.h"
#include "fmgr.h"
#include "mb/pg_wchar.h"
#include "../../Unicode/utf8_to_koi8r.map"
#include "../../Unicode/koi8r_to_utf8.map"
#include "../../Unicode/utf8_to_koi8u.map"
#include "../../Unicode/koi8u_to_utf8.map"

PG_MODULE_MAGIC;

PG_FUNCTION_INFO_V1(utf8_to_koi8r);
PG_FUNCTION_INFO_V1(koi8r_to_utf8);

PG_FUNCTION_INFO_V1(utf8_to_koi8u);
PG_FUNCTION_INFO_V1(koi8u_to_utf8);

extern Datum utf8_to_koi8r(PG_FUNCTION_ARGS);
extern Datum koi8r_to_utf8(PG_FUNCTION_ARGS);

extern Datum utf8_to_koi8u(PG_FUNCTION_ARGS);
extern Datum koi8u_to_utf8(PG_FUNCTION_ARGS);

/* ----------
 * conv_proc(
 *          INTEGER,    -- source encoding id
 *          INTEGER,    -- destination encoding id
 *          CSTRING,    -- source string (null terminated C string)
 *          CSTRING,    -- destination string (null terminated C string)
 *          INTEGER           -- source string length
 * ) returns VOID;
 * ----------
 */

Datum
utf8_to_koi8r(PG_FUNCTION_ARGS)
{
      unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
      unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
      int               len = PG_GETARG_INT32(4);

      CHECK_ENCODING_CONVERSION_ARGS(PG_UTF8, PG_KOI8R);

      UtfToLocal(src, dest, ULmapKOI8R, NULL,
                   sizeof(ULmapKOI8R) / sizeof(pg_utf_to_local), 0, PG_KOI8R, len);

      PG_RETURN_VOID();
}

Datum
koi8r_to_utf8(PG_FUNCTION_ARGS)
{
      unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
      unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
      int               len = PG_GETARG_INT32(4);

      CHECK_ENCODING_CONVERSION_ARGS(PG_KOI8R, PG_UTF8);

      LocalToUtf(src, dest, LUmapKOI8R, NULL,
                   sizeof(LUmapKOI8R) / sizeof(pg_local_to_utf), 0, PG_KOI8R, len);

      PG_RETURN_VOID();
}

Datum
utf8_to_koi8u(PG_FUNCTION_ARGS)
{
      unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
      unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
      int               len = PG_GETARG_INT32(4);

      CHECK_ENCODING_CONVERSION_ARGS(PG_UTF8, PG_KOI8U);

      UtfToLocal(src, dest, ULmapKOI8U, NULL,
                   sizeof(ULmapKOI8U) / sizeof(pg_utf_to_local), 0, PG_KOI8U, len);

      PG_RETURN_VOID();
}

Datum
koi8u_to_utf8(PG_FUNCTION_ARGS)
{
      unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
      unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
      int               len = PG_GETARG_INT32(4);

      CHECK_ENCODING_CONVERSION_ARGS(PG_KOI8U, PG_UTF8);

      LocalToUtf(src, dest, LUmapKOI8U, NULL,
                   sizeof(LUmapKOI8U) / sizeof(pg_local_to_utf), 0, PG_KOI8U, len);

      PG_RETURN_VOID();
}

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