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/*
* Routines for handling of 'SET var TO', 'SHOW var' and 'RESET var'
* statements.
*
* $Id: variable.c,v 1.6 1997/04/24 15:41:37 vadim Exp $
*
*/
#include <stdio.h>
#include <string.h>
#include "postgres.h"
#include "miscadmin.h"
#include "tcop/variable.h"
#include "utils/builtins.h"
#include "optimizer/internal.h"
extern Cost _cpu_page_wight_;
extern Cost _cpu_index_page_wight_;
/*-----------------------------------------------------------------------*/
#if USE_EURODATES
#define DATE_EURO TRUE
#else
#define DATE_EURO FALSE
#endif
/*-----------------------------------------------------------------------*/
struct PGVariables PGVariables =
{
{ DATE_EURO, Date_Postgres }
};
/*-----------------------------------------------------------------------*/
static const char *get_token(char *buf, int size, const char *str)
{
if(!*str)
return NULL;
/* skip white space */
while(*str && (*str == ' ' || *str == '\t'))
str++;
/* copy until we hit white space or comma or end of string */
while(*str && *str != ' ' && *str != '\t' && *str != ',' && size-- > 1)
*buf++ = *str++;
*buf = '\0';
/* skip white space and comma*/
while(*str && (*str == ' ' || *str == '\t' || *str == ','))
str++;
return str;
}
/*-----------------------------------------------------------------------*/
static bool parse_null(const char *value)
{
return TRUE;
}
static bool show_null(const char *value)
{
return TRUE;
}
static bool reset_null(const char *value)
{
return TRUE;
}
static bool parse_cost_heap (const char *value)
{
float32 res = float4in ((char*)value);
_cpu_page_wight_ = *res;
return TRUE;
}
static bool show_cost_heap ()
{
elog (NOTICE, "COST_HEAP is %f", _cpu_page_wight_);
return TRUE;
}
static bool reset_cost_heap ()
{
_cpu_page_wight_ = _CPU_PAGE_WEIGHT_;
return TRUE;
}
static bool parse_cost_index (const char *value)
{
float32 res = float4in ((char*)value);
_cpu_index_page_wight_ = *res;
return TRUE;
}
static bool show_cost_index ()
{
elog (NOTICE, "COST_INDEX is %f", _cpu_index_page_wight_);
return TRUE;
}
static bool reset_cost_index ()
{
_cpu_index_page_wight_ = _CPU_INDEX_PAGE_WEIGHT_;
return TRUE;
}
static bool parse_date(const char *value)
{
char tok[32];
int dcnt = 0, ecnt = 0;
while((value = get_token(tok, sizeof(tok), value)) != 0)
{
/* Ugh. Somebody ought to write a table driven version -- mjl */
if(!strcasecmp(tok, "iso"))
{
DateStyle = USE_ISO_DATES;
dcnt++;
}
else if(!strcasecmp(tok, "sql"))
{
DateStyle = USE_SQL_DATES;
dcnt++;
}
else if(!strcasecmp(tok, "postgres"))
{
DateStyle = USE_POSTGRES_DATES;
dcnt++;
}
else if(!strncasecmp(tok, "euro", 4))
{
EuroDates = TRUE;
ecnt++;
}
else if((!strcasecmp(tok, "us"))
|| (!strncasecmp(tok, "noneuro", 7)))
{
EuroDates = FALSE;
ecnt++;
}
else if(!strcasecmp(tok, "default"))
{
DateStyle = USE_POSTGRES_DATES;
EuroDates = FALSE;
ecnt++;
}
else
{
elog(WARN, "Bad value for date (%s)", tok);
}
}
if(dcnt > 1 || ecnt > 1)
elog(NOTICE, "Conflicting settings for date");
return TRUE;
}
static bool show_date()
{
char buf[64];
sprintf( buf, "Date style is %s with%s European conventions",
((DateStyle == USE_ISO_DATES)? "iso": ((DateStyle == USE_ISO_DATES)? "sql": "postgres")),
((EuroDates)? "": "out"));
elog(NOTICE, buf, NULL);
return TRUE;
}
static bool reset_date()
{
DateStyle = USE_POSTGRES_DATES;
EuroDates = FALSE;
return TRUE;
}
/*-----------------------------------------------------------------------*/
struct VariableParsers
{
const char *name;
bool (*parser)(const char *);
bool (*show)();
bool (*reset)();
} VariableParsers[] =
{
{ "datestyle", parse_date, show_date, reset_date },
{ "timezone", parse_null, show_null, reset_null },
{ "cost_heap", parse_cost_heap,
show_cost_heap, reset_cost_heap },
{ "cost_index", parse_cost_index,
show_cost_index, reset_cost_index },
{ NULL, NULL, NULL }
};
/*-----------------------------------------------------------------------*/
bool SetPGVariable(const char *name, const char *value)
{
struct VariableParsers *vp;
for(vp = VariableParsers; vp->name; vp++)
{
if(!strcasecmp(vp->name, name))
return (vp->parser)(value);
}
elog(NOTICE, "Unrecognized variable %s", name);
return TRUE;
}
/*-----------------------------------------------------------------------*/
bool GetPGVariable(const char *name)
{
struct VariableParsers *vp;
for(vp = VariableParsers; vp->name; vp++)
{
if(!strcasecmp(vp->name, name))
return (vp->show)();
}
elog(NOTICE, "Unrecognized variable %s", name);
return TRUE;
}
/*-----------------------------------------------------------------------*/
bool ResetPGVariable(const char *name)
{
struct VariableParsers *vp;
for(vp = VariableParsers; vp->name; vp++)
{
if(!strcasecmp(vp->name, name))
return (vp->reset)();
}
elog(NOTICE, "Unrecognized variable %s", name);
return TRUE;
}
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