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/* -----------------------------------------------------------------------
* ascii.c
*
* $Header: /cvsroot/pgsql/src/backend/utils/adt/ascii.c,v 1.10 2001/10/25 05:49:43 momjian Exp $
*
* Portions Copyright (c) 1999-2000, PostgreSQL Global Development Group
*
*
* TO_ASCII()
*
* The PostgreSQL routine for string to ascii conversion.
*
* -----------------------------------------------------------------------
*/
#include "postgres.h"
#include "utils/builtins.h"
#include "mb/pg_wchar.h"
#include "utils/ascii.h"
/* ----------
* even if MULTIBYTE is not enabled, these functions must exist
* since pg_proc.h has references to them.
* ----------
*/
#ifndef MULTIBYTE
static void multibyte_error(void);
static void
multibyte_error(void)
{
elog(ERROR, "Multi-byte support is not enabled");
}
Datum
to_ascii_encname(PG_FUNCTION_ARGS)
{
multibyte_error();
return 0; /* keep compiler quiet */
}
Datum
to_ascii_enc(PG_FUNCTION_ARGS)
{
multibyte_error();
return 0; /* keep compiler quiet */
}
Datum
to_ascii_default(PG_FUNCTION_ARGS)
{
multibyte_error();
return 0; /* keep compiler quiet */
}
#else /* with MULTIBYTE */
static text *encode_to_ascii(text *data, int enc);
/* ----------
* to_ascii
* ----------
*/
char *
pg_to_ascii(unsigned char *src, unsigned char *src_end, unsigned char *desc, int enc)
{
unsigned char *x = NULL;
unsigned char *ascii = NULL;
int range = 0;
/*
* relevant start for an encoding
*/
#define RANGE_128 128
#define RANGE_160 160
if (enc == PG_LATIN1)
{
/*
* ISO-8859-1 <range: 160 -- 255>
*/
ascii = " cL Y \"Ca -R 'u ., ?AAAAAAACEEEEIIII NOOOOOxOUUUUYTBaaaaaaaceeeeiiii nooooo/ouuuuyty";
range = RANGE_160;
}
else if (enc == PG_LATIN2)
{
/*
* ISO-8859-2 <range: 160 -- 255>
*/
ascii = " A L LS \"SSTZ-ZZ a,l'ls ,sstz\"zzRAAAALCCCEEEEIIDDNNOOOOxRUUUUYTBraaaalccceeeeiiddnnoooo/ruuuuyt.";
range = RANGE_160;
}
else if (enc == PG_WIN1250)
{
/*
* Window CP1250 <range: 128 -- 255>
*/
ascii = " ' \" %S<STZZ `'\"\".-- s>stzz L A \"CS -RZ ,l'u .,as L\"lzRAAAALCCCEEEEIIDDNNOOOOxRUUUUYTBraaaalccceeeeiiddnnoooo/ruuuuyt ";
range = RANGE_128;
}
else
{
elog(ERROR, "pg_to_ascii(): unsupported encoding from %s",
pg_encoding_to_char(enc));
}
/*
* Encode
*/
for (x = src; x <= src_end; x++)
{
if (*x < 128)
*desc++ = *x;
else if (*x < range)
*desc++ = ' '; /* bogus 128 to 'range' */
else
*desc++ = ascii[*x - range];
}
return desc;
}
/* ----------
* encode text
* ----------
*/
static text *
encode_to_ascii(text *data, int enc)
{
pg_to_ascii(
(unsigned char *) VARDATA(data), /* src */
VARDATA(data) + VARSIZE(data), /* src end */
(unsigned char *) VARDATA(data), /* desc */
enc); /* encoding */
return data;
}
/* ----------
* convert to ASCII - enc is set as 'name' arg.
* ----------
*/
Datum
to_ascii_encname(PG_FUNCTION_ARGS)
{
PG_RETURN_TEXT_P
(
encode_to_ascii
(
PG_GETARG_TEXT_P_COPY(0),
pg_char_to_encoding(NameStr(*PG_GETARG_NAME(1)))
)
);
}
/* ----------
* convert to ASCII - enc is set as int4
* ----------
*/
Datum
to_ascii_enc(PG_FUNCTION_ARGS)
{
PG_RETURN_TEXT_P
(
encode_to_ascii
(
PG_GETARG_TEXT_P_COPY(0),
PG_GETARG_INT32(1)
)
);
}
/* ----------
* convert to ASCII - current enc is DatabaseEncoding
* ----------
*/
Datum
to_ascii_default(PG_FUNCTION_ARGS)
{
PG_RETURN_TEXT_P
(
encode_to_ascii
(
PG_GETARG_TEXT_P_COPY(0),
GetDatabaseEncoding()
)
);
}
#endif /* MULTIBYTE */
|
