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/*-------------------------------------------------------------------------
* help_config.c
*
* Displays available options under grand unified configuration scheme
*
* Options whose flag bits are set to GUC_NO_SHOW_ALL, GUC_NOT_IN_SAMPLE,
* or GUC_DISALLOW_IN_FILE are not displayed, unless the user specifically
* requests that variable by name
*
* Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/backend/utils/misc/help_config.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <float.h>
#include <limits.h>
#include <unistd.h>
#include "utils/guc_tables.h"
#include "utils/help_config.h"
/*
* This union allows us to mix the numerous different types of structs
* that we are organizing.
*/
typedef union
{
struct config_generic generic;
struct config_bool _bool;
struct config_real real;
struct config_int integer;
struct config_string string;
struct config_enum _enum;
} mixedStruct;
static void printMixedStruct(mixedStruct *structToPrint);
static bool displayStruct(mixedStruct *structToDisplay);
void
GucInfoMain(void)
{
struct config_generic **guc_vars;
int numOpts,
i;
/* Initialize the guc_variables[] array */
build_guc_variables();
guc_vars = get_guc_variables();
numOpts = GetNumConfigOptions();
for (i = 0; i < numOpts; i++)
{
mixedStruct *var = (mixedStruct *) guc_vars[i];
if (displayStruct(var))
printMixedStruct(var);
}
exit(0);
}
/*
* This function will return true if the struct passed to it
* should be displayed to the user.
*/
static bool
displayStruct(mixedStruct *structToDisplay)
{
return !(structToDisplay->generic.flags & (GUC_NO_SHOW_ALL |
GUC_NOT_IN_SAMPLE |
GUC_DISALLOW_IN_FILE));
}
/*
* This function prints out the generic struct passed to it. It will print out
* a different format, depending on what the user wants to see.
*/
static void
printMixedStruct(mixedStruct *structToPrint)
{
printf("%s\t%s\t%s\t",
structToPrint->generic.name,
GucContext_Names[structToPrint->generic.context],
_(config_group_names[structToPrint->generic.group]));
switch (structToPrint->generic.vartype)
{
case PGC_BOOL:
printf("BOOLEAN\t%s\t\t\t",
(structToPrint->_bool.reset_val == 0) ?
"FALSE" : "TRUE");
break;
case PGC_INT:
printf("INTEGER\t%d\t%d\t%d\t",
structToPrint->integer.reset_val,
structToPrint->integer.min,
structToPrint->integer.max);
break;
case PGC_REAL:
printf("REAL\t%g\t%g\t%g\t",
structToPrint->real.reset_val,
structToPrint->real.min,
structToPrint->real.max);
break;
case PGC_STRING:
printf("STRING\t%s\t\t\t",
structToPrint->string.boot_val ? structToPrint->string.boot_val : "");
break;
case PGC_ENUM:
printf("ENUM\t%s\t\t\t",
config_enum_lookup_by_value(&structToPrint->_enum,
structToPrint->_enum.boot_val));
break;
default:
write_stderr("internal error: unrecognized run-time parameter type\n");
break;
}
printf("%s\t%s\n",
(structToPrint->generic.short_desc == NULL) ? "" : _(structToPrint->generic.short_desc),
(structToPrint->generic.long_desc == NULL) ? "" : _(structToPrint->generic.long_desc));
}
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