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Sourcecode: postgresql-8.4 version File versions

help_config.c

/*-------------------------------------------------------------------------
 * 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) 1996-2009, PostgreSQL Global Development Group
 *
 * IDENTIFICATION
 *      $PostgreSQL: pgsql/src/backend/utils/misc/help_config.c,v 1.23 2009/06/11 14:49:06 momjian Exp $
 *
 *-------------------------------------------------------------------------
 */
#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);


int
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);
      }

      return 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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