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Eliminate query length limitation imposed by pg_client_to_server

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and pg_server_to_client.  Eliminate copy.c's restriction on the length
of a single attribute.
This commit is contained in:
Tom Lane
1999-09-11 22:28:11 +00:00
parent b65ab31910
commit 4644fc8071
4 changed files with 138 additions and 163 deletions
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76
src/backend/utils/mb/mbutils.c
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@ -3,7 +3,7 @@
* client encoding and server internal encoding.
* (currently mule internal code (mic) is used)
* Tatsuo Ishii
* $Id: mbutils.c,v 1.8 1999/07/17 20:18:10 momjian Exp $ */
* $Id: mbutils.c,v 1.9 1999/09/11 22:28:00 tgl Exp $ */
#include "postgres.h"
@ -93,59 +93,81 @@ pg_get_client_encoding()
}
/*
* convert client encoding to server encoding. if server_encoding ==
* client_encoding or no conversion function exists,
* returns s. So be careful.
* convert client encoding to server encoding.
*
* CASE 1: if no conversion is required, then the given pointer s is returned.
*
* CASE 2: if conversion is required, a palloc'd string is returned.
*
* Callers must check whether return value differs from passed value
* to determine whether to pfree the result or not!
*
* Note: we assume that conversion cannot cause more than a 4-to-1 growth
* in the length of the string --- is this enough?
*/
unsigned char *
pg_client_to_server(unsigned char *s, int len)
{
static unsigned char b1[MAX_PARSE_BUFFER * 4]; /* is this enough? */
static unsigned char b2[MAX_PARSE_BUFFER * 4]; /* is this enough? */
unsigned char *p = s;
unsigned char *result = s;
unsigned char *buf;
if (client_encoding == GetDatabaseEncoding())
return (p);
return result;
if (client_to_mic)
{
(*client_to_mic) (s, b1, len);
len = strlen(b1);
p = b1;
buf = (unsigned char *) palloc(len * 4 + 1);
(*client_to_mic) (result, buf, len);
result = buf;
len = strlen(result);
}
if (server_from_mic)
{
(*server_from_mic) (p, b2, len);
p = b2;
buf = (unsigned char *) palloc(len * 4 + 1);
(*server_from_mic) (result, buf, len);
if (result != s)
pfree(result); /* release first buffer */
result = buf;
}
return (p);
return result;
}
/*
* convert server encoding to client encoding. if server_encoding ==
* client_encoding or no conversion function exists,
* returns s. So be careful.
* convert server encoding to client encoding.
*
* CASE 1: if no conversion is required, then the given pointer s is returned.
*
* CASE 2: if conversion is required, a palloc'd string is returned.
*
* Callers must check whether return value differs from passed value
* to determine whether to pfree the result or not!
*
* Note: we assume that conversion cannot cause more than a 4-to-1 growth
* in the length of the string --- is this enough?
*/
unsigned char *
pg_server_to_client(unsigned char *s, int len)
{
static unsigned char b1[MAX_PARSE_BUFFER * 4]; /* is this enough? */
static unsigned char b2[MAX_PARSE_BUFFER * 4]; /* is this enough? */
unsigned char *p = s;
unsigned char *result = s;
unsigned char *buf;
if (client_encoding == GetDatabaseEncoding())
return (p);
return result;
if (server_to_mic)
{
(*server_to_mic) (s, b1, len);
len = strlen(b1);
p = b1;
buf = (unsigned char *) palloc(len * 4 + 1);
(*server_to_mic) (result, buf, len);
result = buf;
len = strlen(result);
}
if (client_from_mic)
{
(*client_from_mic) (p, b2, len);
p = b2;
buf = (unsigned char *) palloc(len * 4 + 1);
(*client_from_mic) (result, buf, len);
if (result != s)
pfree(result); /* release first buffer */
result = buf;
}
return (p);
return result;
}
/* convert a multi-byte string to a wchar */