greenplumn utf8_and_ascii 源码
greenplumn utf8_and_ascii 代码
文件路径：/src/backend/utils/mb/conversion_procs/utf8_and_ascii/utf8_and_ascii.c
/*-------------------------------------------------------------------------
*
* ASCII <--> UTF8
*
* 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/utf8_and_ascii/utf8_and_ascii.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "fmgr.h"
#include "mb/pg_wchar.h"
PG_MODULE_MAGIC;
PG_FUNCTION_INFO_V1(ascii_to_utf8);
PG_FUNCTION_INFO_V1(utf8_to_ascii);
/* ----------
* 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
ascii_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_SQL_ASCII, PG_UTF8);
/* this looks wrong, but basically we're just rejecting high-bit-set */
pg_ascii2mic(src, dest, len);
PG_RETURN_VOID();
}
Datum
utf8_to_ascii(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_SQL_ASCII);
/* this looks wrong, but basically we're just rejecting high-bit-set */
pg_mic2ascii(src, dest, len);
PG_RETURN_VOID();
}
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