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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) 1996-2025, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/backend/utils/misc/help_config.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <limits.h>
#include <unistd.h>
#include "utils/guc_tables.h"
#include "utils/help_config.h"
static void printMixedStruct(const struct config_generic *structToPrint);
static bool displayStruct(const struct config_generic *structToDisplay);
void
GucInfoMain(void)
{
struct config_generic **guc_vars;
int numOpts;
/* Initialize the GUC hash table */
build_guc_variables();
guc_vars = get_guc_variables(&numOpts);
for (int i = 0; i < numOpts; i++)
{
const struct config_generic *var = 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(const struct config_generic *structToDisplay)
{
return !(structToDisplay->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(const struct config_generic *structToPrint)
{
printf("%s\t%s\t%s\t",
structToPrint->name,
GucContext_Names[structToPrint->context],
_(config_group_names[structToPrint->group]));
switch (structToPrint->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->_int.reset_val,
structToPrint->_int.min,
structToPrint->_int.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,
structToPrint->_enum.boot_val));
break;
default:
write_stderr("internal error: unrecognized run-time parameter type\n");
break;
}
printf("%s\t%s\n",
(structToPrint->short_desc == NULL) ? "" : _(structToPrint->short_desc),
(structToPrint->long_desc == NULL) ? "" : _(structToPrint->long_desc));
}
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