greenplumn latin_and_mic 源码

2022-08-18
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greenplumn latin_and_mic 代码

文件路径：/src/backend/utils/mb/conversion_procs/latin_and_mic/latin_and_mic.c

/*-------------------------------------------------------------------------
 *
 *	  LATINn and MULE_INTERNAL
 *
 * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * IDENTIFICATION
 *	  src/backend/utils/mb/conversion_procs/latin_and_mic/latin_and_mic.c
 *
 *-------------------------------------------------------------------------
 */

#include "postgres.h"
#include "fmgr.h"
#include "mb/pg_wchar.h"

PG_MODULE_MAGIC;

PG_FUNCTION_INFO_V1(latin1_to_mic);
PG_FUNCTION_INFO_V1(mic_to_latin1);
PG_FUNCTION_INFO_V1(latin3_to_mic);
PG_FUNCTION_INFO_V1(mic_to_latin3);
PG_FUNCTION_INFO_V1(latin4_to_mic);
PG_FUNCTION_INFO_V1(mic_to_latin4);

/* ----------
 * 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
latin1_to_mic(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_LATIN1, PG_MULE_INTERNAL);

	latin2mic(src, dest, len, LC_ISO8859_1, PG_LATIN1);

	PG_RETURN_VOID();
}

Datum
mic_to_latin1(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_MULE_INTERNAL, PG_LATIN1);

	mic2latin(src, dest, len, LC_ISO8859_1, PG_LATIN1);

	PG_RETURN_VOID();
}

Datum
latin3_to_mic(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_LATIN3, PG_MULE_INTERNAL);

	latin2mic(src, dest, len, LC_ISO8859_3, PG_LATIN3);

	PG_RETURN_VOID();
}

Datum
mic_to_latin3(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_MULE_INTERNAL, PG_LATIN3);

	mic2latin(src, dest, len, LC_ISO8859_3, PG_LATIN3);

	PG_RETURN_VOID();
}

Datum
latin4_to_mic(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_LATIN4, PG_MULE_INTERNAL);

	latin2mic(src, dest, len, LC_ISO8859_4, PG_LATIN4);

	PG_RETURN_VOID();
}

Datum
mic_to_latin4(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_MULE_INTERNAL, PG_LATIN4);

	mic2latin(src, dest, len, LC_ISO8859_4, PG_LATIN4);

	PG_RETURN_VOID();
}

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