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getconf.c

/*
 * ORIGINAL COPYRIGHT STATEMENT:
 *
 * Copyright (c) 1994 Winning Strategies, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Winning Strategies, Inc.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * POSIX.2 getconf utility
 *
 * Originally Written by:
 *    J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
 *
 * Heavily modified for inclusion in bash by
 *    Chet Ramey <chet@po.cwru.edu>
 */

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#ifdef HAVE_SYS_PARAM_H
#  include <sys/param.h>
#endif

#include <stdio.h>
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_LOCALE_H
#include <locale.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <errno.h>

#include "typemax.h"

#include "bashansi.h"
#include "shell.h"
#include "builtins.h"
#include "stdc.h"
#include "common.h"
#include "bashgetopt.h"

#include "getconf.h"

#ifndef errno
extern int errno;
#endif

struct conf_variable
{
  const char *name;
  enum { SYSCONF, CONFSTR, PATHCONF, CONSTANT, G_UNDEF } type;
  long value;
};

#ifndef HAVE_CONFSTR
static size_t confstr __P((int, char *, size_t));
#endif

#ifndef HAVE_SYSCONF
static long sysconf __P((int));
#endif

#ifndef HAVE_PATHCONF
static long pathconf __P((const char *, int));
#endif

static const struct conf_variable conf_table[] =
{
  /* POSIX.2 Configurable Variable Values */
  { "PATH",             CONFSTR,    _CS_PATH          },
  { "CS_PATH",                CONFSTR,    _CS_PATH          },

  /* POSIX.1 Configurable Variable Values (only Solaris?) */
#if defined (_CS_LFS_CFLAGS)
  { "LFS_CFLAGS",       CONFSTR,    _CS_LFS_CFLAGS          },
  { "LFS_LDFLAGS",            CONFSTR,    _CS_LFS_LDFLAGS         },
  { "LFS_LIBS",               CONFSTR,    _CS_LFS_LIBS            },
  { "LFS_LINTFLAGS",          CONFSTR,    _CS_LFS_LINTFLAGS },
#endif
#if defined (_CS_LFS64_CFLAGS)
  { "LFS64_CFLAGS",           CONFSTR,    _CS_LFS64_CFLAGS  },
  { "LFS64_LDFLAGS",          CONFSTR,    _CS_LFS64_LDFLAGS },
  { "LFS64_LIBS",       CONFSTR,    _CS_LFS64_LIBS          },
  { "LFS64_LINTFLAGS",        CONFSTR,    _CS_LFS64_LINTFLAGS     },
#endif

  /* Single UNIX Specification version 2 Configurable Variable Values.  The
     SYSCONF variables say whether or not the appropriate CONFSTR variables
     are available. */
#if defined (_SC_XBS5_ILP32_OFF32)
  { "XBS5_ILP32_OFF32",             SYSCONF,    _SC_XBS5_ILP32_OFF32    },
  { "_XBS5_ILP32_OFF32",            SYSCONF,    _SC_XBS5_ILP32_OFF32    },
#endif
#if defined (_CS_XBS5_ILP32_OFF32_CFLAGS)
  { "XBS5_ILP32_OFF32_CFLAGS",      CONFSTR,    _CS_XBS5_ILP32_OFF32_CFLAGS },
  { "XBS5_ILP32_OFF32_LDFLAGS",           CONFSTR,    _CS_XBS5_ILP32_OFF32_LDFLAGS },
  { "XBS5_ILP32_OFF32_LIBS",        CONFSTR,    _CS_XBS5_ILP32_OFF32_LIBS },
  { "XBS5_ILP32_OFF32_LINTFLAGS",       CONFSTR,      _CS_XBS5_ILP32_OFF32_LINTFLAGS },
#endif
#if defined (_SC_XBS5_ILP32_OFFBIG)
  { "XBS5_ILP32_OFFBIG",            SYSCONF,    _SC_XBS5_ILP32_OFFBIG   },
  { "_XBS5_ILP32_OFFBIG",           SYSCONF,    _SC_XBS5_ILP32_OFFBIG   },
#endif
#if defined (_CS_XBS5_ILP32_OFFBIG_CFLAGS)
  { "XBS5_ILP32_OFFBIG_CFLAGS",     CONFSTR,    _CS_XBS5_ILP32_OFFBIG_CFLAGS },
  { "XBS5_ILP32_OFFBIG_LDFLAGS",    CONFSTR,    _CS_XBS5_ILP32_OFFBIG_LDFLAGS },
  { "XBS5_ILP32_OFFBIG_LIBS",       CONFSTR,    _CS_XBS5_ILP32_OFFBIG_LIBS },
  { "XBS5_ILP32_OFFBIG_LINTFLAGS",      CONFSTR,      _CS_XBS5_ILP32_OFFBIG_LINTFLAGS },
#endif
#if defined (_SC_XBS5_LP64_OFF64)
  { "XBS5_LP64_OFF64",              SYSCONF,    _SC_XBS5_LP64_OFF64     },
  { "_XBS5_LP64_OFF64",             SYSCONF,    _SC_XBS5_LP64_OFF64     },
#endif
#if defined (_CS_XBS5_LP64_OFF64_CFLAGS)
  { "XBS5_LP64_OFF64_CFLAGS",       CONFSTR,    _CS_XBS5_LP64_OFF64_CFLAGS },
  { "XBS5_LP64_OFF64_LDFLAGS",      CONFSTR,    _CS_XBS5_LP64_OFF64_LDFLAGS },
  { "XBS5_LP64_OFF64_LIBS",         CONFSTR,    _CS_XBS5_LP64_OFF64_LIBS },
  { "XBS5_LP64_OFF64_LINTFLAGS",    CONFSTR,    _CS_XBS5_LP64_OFF64_LINTFLAGS },
#endif
#if defined (_SC_XBS5_LPBIG_OFFBIG)
  { "XBS5_LPBIG_OFFBIG",            SYSCONF,    _SC_XBS5_LPBIG_OFFBIG   },
  { "_XBS5_LPBIG_OFFBIG",           SYSCONF,    _SC_XBS5_LPBIG_OFFBIG   },
#endif
#if defined (_CS_XBS5_LPBIG_OFFBIG_CFLAGS)
  { "XBS5_LPBIG_OFFBIG_CFLAGS",     CONFSTR,    _CS_XBS5_LPBIG_OFFBIG_CFLAGS },
  { "XBS5_LPBIG_OFFBIG_LDFLAGS",    CONFSTR,    _CS_XBS5_LPBIG_OFFBIG_LDFLAGS },
  { "XBS5_LPBIG_OFFBIG_LIBS",       CONFSTR,    _CS_XBS5_LPBIG_OFFBIG_LIBS },
  { "XBS5_LPBIG_OFFBIG_LINTFLAGS",      CONFSTR,      _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS },
#endif

  /* Single UNIX Specification version 3 (POSIX.1-200x) Configurable Variable
     Values.  The SYSCONF variables say whether or not the appropriate CONFSTR
     variables are available. */

#if defined (_SC_POSIX_V6_ILP32_OFF32)
  { "_POSIX_V6_ILP32_OFF32",        SYSCONF,    _SC_POSIX_V6_ILP32_OFF32  },
#endif
#if defined (_CS_POSIX_V6_ILP32_OFF32_CFLAGS)
  { "POSIX_V6_ILP32_OFF32_CFLAGS",  CONFSTR,    _CS_POSIX_V6_ILP32_OFF32_CFLAGS },
  { "POSIX_V6_ILP32_OFF32_LDFLAGS", CONFSTR,    _CS_POSIX_V6_ILP32_OFF32_LDFLAGS },
  { "POSIX_V6_ILP32_OFF32_LIBS",    CONFSTR,    _CS_POSIX_V6_ILP32_OFF32_LIBS },
  { "POSIX_V6_ILP32_OFF32_LINTFLAGS",     CONFSTR,    _CS_POSIX_V6_ILP32_OFF32_LINTFLAGS },
#endif
#if defined (_SC_POSIX_V6_ILP32_OFFBIG)
  { "_POSIX_V6_ILP32_OFFBIG",       SYSCONF,    _SC_POSIX_V6_ILP32_OFFBIG },
#endif
#if defined (_CS_POSIX_V6_ILP32_OFFBIG_CFLAGS)
  { "POSIX_V6_ILP32_OFFBIG_CFLAGS", CONFSTR,    _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS },
  { "POSIX_V6_ILP32_OFFBIG_LDFLAGS",      CONFSTR,    _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS },
  { "POSIX_V6_ILP32_OFFBIG_LIBS",   CONFSTR,    _CS_POSIX_V6_ILP32_OFFBIG_LIBS },
  { "POSIX_V6_ILP32_OFFBIG_LINTFLAGS",    CONFSTR,    _CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS },
#endif
#if defined (_SC_POSIX_V6_LP64_OFF64)
  { "_POSIX_V6_LP64_OFF64",         SYSCONF,    _SC_POSIX_V6_LP64_OFF64   },
#endif
#if defined (_CS_POSIX_V6_LP64_OFF64_CFLAGS)
  { "POSIX_V6_LP64_OFF64_CFLAGS",   CONFSTR,    _CS_POSIX_V6_LP64_OFF64_CFLAGS },
  { "POSIX_V6_LP64_OFF64_LDFLAGS",  CONFSTR,    _CS_POSIX_V6_LP64_OFF64_LDFLAGS },
  { "POSIX_V6_LP64_OFF64_LIBS",           CONFSTR,    _CS_POSIX_V6_LP64_OFF64_LIBS },
  { "POSIX_V6_LP64_OFF64_LINTFLAGS",      CONFSTR,    _CS_POSIX_V6_LP64_OFF64_LINTFLAGS },
#endif
#if defined (_SC_POSIX_V6_LPBIG_OFFBIG)
  { "_POSIX_V6_LPBIG_OFFBIG", SYSCONF,    _SC_POSIX_V6_LPBIG_OFFBIG },
#endif
#if defined (_CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS)
  { "POSIX_V6_LPBIG_OFFBIG_CFLAGS", CONFSTR,    _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS },
  { "POSIX_V6_LPBIG_OFFBIG_LDFLAGS",      CONFSTR,    _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS },
  { "POSIX_V6_LPBIG_OFFBIG_LIBS",   CONFSTR,    _CS_POSIX_V6_LPBIG_OFFBIG_LIBS },
  { "POSIX_V6_LPBIG_OFFBIG_LINTFLAGS",    CONFSTR,    _CS_POSIX_V6_LPBIG_OFFBIG_LINTFLAGS },
#endif

  /* POSIX.2 Utility Limit Minimum Values */
#ifdef _POSIX2_BC_BASE_MAX
  { "POSIX2_BC_BASE_MAX",     CONSTANT,   _POSIX2_BC_BASE_MAX     },
#else
  { "POSIX2_BC_BASE_MAX",     G_UNDEF,    -1                },
#endif
#ifdef _POSIX2_BC_DIM_MAX
  { "POSIX2_BC_DIM_MAX",      CONSTANT,   _POSIX2_BC_DIM_MAX      },
#else
  { "POSIX2_BC_DIM_MAX",      G_UNDEF,    -1                },
#endif
#ifdef _POSIX2_BC_SCALE_MAX
  { "POSIX2_BC_SCALE_MAX",    CONSTANT,   _POSIX2_BC_SCALE_MAX    },
#else
  { "POSIX2_BC_SCALE_MAX",    G_UNDEF,    -1                },
#endif
#ifdef _POSIX2_BC_STRING_MAX
  { "POSIX2_BC_STRING_MAX",   CONSTANT,   _POSIX2_BC_STRING_MAX   },
#else
  { "POSIX2_BC_STRING_MAX",   G_UNDEF,    -1                },
#endif
#ifdef _POSIX2_COLL_WEIGHTS_MAX
  { "POSIX2_COLL_WEIGHTS_MAX",      CONSTANT,   _POSIX2_COLL_WEIGHTS_MAX },
#else
  { "POSIX2_COLL_WEIGHTS_MAX",      G_UNDEF,    -1                 },
#endif
#if defined (_POSIX2_EQUIV_CLASS_MAX)
  { "POSIX2_EQUIV_CLASS_MAX", CONSTANT,   _POSIX2_EQUIV_CLASS_MAX },
#endif
#ifdef _POSIX2_EXPR_NEST_MAX
  { "POSIX2_EXPR_NEST_MAX",   CONSTANT,   _POSIX2_EXPR_NEST_MAX   },
#else
  { "POSIX2_EXPR_NEST_MAX",   G_UNDEF,    -1                },
#endif
#ifdef _POSIX2_LINE_MAX
  { "POSIX2_LINE_MAX",        CONSTANT,   _POSIX2_LINE_MAX  },
#else
  { "POSIX2_LINE_MAX",        G_UNDEF,    -1                },
#endif
#ifdef _POSIX2_RE_DUP_MAX
  { "POSIX2_RE_DUP_MAX",      CONSTANT,   _POSIX2_RE_DUP_MAX      },
#else
  { "POSIX2_RE_DUP_MAX",      G_UNDEF,    -1                },
#endif
#if defined (_POSIX2_VERSION)
  { "POSIX2_VERSION",         CONSTANT,   _POSIX2_VERSION         },
#else
#  if !defined (_SC_2_VERSION)
  { "POSIX2_VERSION",         G_UNDEF,    -1                },
#  endif
#endif

  /* POSIX.1 Minimum Values */
#ifdef _POSIX_ARG_MAX
  { "_POSIX_ARG_MAX",         CONSTANT,   _POSIX_ARG_MAX          },
#else
  { "_POSIX_ARG_MAX",         G_UNDEF,    -1                },
#endif
#ifdef _POSIX_CHILD_MAX
  { "_POSIX_CHILD_MAX",       CONSTANT,   _POSIX_CHILD_MAX  },
#else
  { "_POSIX_CHILD_MAX",       G_UNDEF,    -1          },
#endif  
#ifdef _POSIX_LINK_MAX
  { "_POSIX_LINK_MAX",        CONSTANT,   _POSIX_LINK_MAX         },
#else
  { "_POSIX_LINK_MAX",        G_UNDEF,    -1                },
#endif  
#ifdef _POSIX_MAX_CANON
  { "_POSIX_MAX_CANON",       CONSTANT,   _POSIX_MAX_CANON  },
#else
  { "_POSIX_MAX_CANON",       G_UNDEF,    -1                },
#endif  
#ifdef _POSIX_MAX_INPUT
  { "_POSIX_MAX_INPUT",       CONSTANT,   _POSIX_MAX_INPUT  },
#else
  { "_POSIX_MAX_INPUT",       G_UNDEF,    -1                },
#endif  
#ifdef _POSIX_NAME_MAX
  { "_POSIX_NAME_MAX",        CONSTANT,   _POSIX_NAME_MAX         },
#else
  { "_POSIX_NAME_MAX",        G_UNDEF,    -1                },
#endif  
#ifdef _POSIX_NGROUPS_MAX
  { "_POSIX_NGROUPS_MAX",     CONSTANT,   _POSIX_NGROUPS_MAX      },
#else
  { "_POSIX_NGROUPS_MAX",     G_UNDEF,    -1                },
#endif  
#ifdef _POSIX_OPEN_MAX
  { "_POSIX_OPEN_MAX",        CONSTANT,   _POSIX_OPEN_MAX         },
#else
  { "_POSIX_OPEN_MAX",        G_UNDEF,    -1                },
#endif  
#ifdef _POSIX_PATH_MAX
  { "_POSIX_PATH_MAX",        CONSTANT,   _POSIX_PATH_MAX         },
#else
  { "_POSIX_PATH_MAX",        G_UNDEF,    -1                },
#endif  
#ifdef _POSIX_PIPE_BUF
  { "_POSIX_PIPE_BUF",        CONSTANT,   _POSIX_PIPE_BUF         },
#else
  { "_POSIX_PIPE_BUF",        G_UNDEF,    -1                },
#endif  
#ifdef _POSIX_SSIZE_MAX
  { "_POSIX_SSIZE_MAX",       CONSTANT,   _POSIX_SSIZE_MAX  },
#else
  { "_POSIX_SSIZE_MAX",       G_UNDEF,    -1                },
#endif  
#ifdef _POSIX_STREAM_MAX
  { "_POSIX_STREAM_MAX",      CONSTANT,   _POSIX_STREAM_MAX },
#else
  { "_POSIX_STREAM_MAX",      G_UNDEF,    -1                },
#endif  
#ifdef _POSIX_TZNAME_MAX
  { "_POSIX_TZNAME_MAX",      CONSTANT,   _POSIX_TZNAME_MAX },
#else
  { "_POSIX_TZNAME_MAX",      G_UNDEF,    -1    },
#endif  

  /* POSIX.2/XPG 4.2 (and later) Symbolic Utility Limits */
#ifdef _SC_BC_BASE_MAX
  { "BC_BASE_MAX",            SYSCONF,    _SC_BC_BASE_MAX         },
#endif
#ifdef _SC_BC_DIM_MAX
  { "BC_DIM_MAX",       SYSCONF,    _SC_BC_DIM_MAX          },
#endif
#ifdef _SC_BC_SCALE_MAX
  { "BC_SCALE_MAX",           SYSCONF,    _SC_BC_SCALE_MAX  },
#endif
#ifdef _SC_BC_STRING_MAX
  { "BC_STRING_MAX",          SYSCONF,    _SC_BC_STRING_MAX },
#endif
#ifdef CHARCLASS_NAME_MAX
  { "CHARCLASS_NAME_MAX",     CONSTANT,   CHARCLASS_NAME_MAX      },
#endif
#ifdef _SC_COLL_WEIGHTS_MAX
  { "COLL_WEIGHTS_MAX",       SYSCONF,    _SC_COLL_WEIGHTS_MAX    },
#endif
#ifdef _SC_EXPR_NEST_MAX
  { "EXPR_NEST_MAX",          SYSCONF,    _SC_EXPR_NEST_MAX },
#endif
#ifdef _SC_LINE_MAX
  { "LINE_MAX",               SYSCONF,    _SC_LINE_MAX            },
#endif
#  ifdef NL_ARGMAX
  { "NL_ARGMAX",        CONSTANT,   NL_ARGMAX         },
#endif
#ifdef NL_LANGMAX
  { "NL_LANGMAX",       CONSTANT,   NL_LANGMAX        },
#endif
#ifdef NL_MSGMAX
  { "NL_MSGMAX",        CONSTANT,   NL_MSGMAX         },
#endif
#ifdef NL_NMAX
  { "NL_NMAX",                CONSTANT,   NL_NMAX                 },
#endif
#ifdef NL_SETMAX
  { "NL_SETMAX",        CONSTANT,   NL_SETMAX         },
#endif
#ifdef NL_TEXTMAX
  { "NL_TEXTMAX",       CONSTANT,   NL_TEXTMAX        },
#endif
#ifdef _SC_RE_DUP_MAX
  { "RE_DUP_MAX",       SYSCONF,    _SC_RE_DUP_MAX          },
#endif

  /* POSIX.2 Optional Facility Configuration Values */
#ifdef _SC_2_C_BIND
  { "_POSIX2_C_BIND",         SYSCONF,    _SC_2_C_BIND            },
#else
  { "_POSIX2_C_BIND",         G_UNDEF,    -1                },
#endif
#ifdef _SC_2_C_DEV
  { "_POSIX2_C_DEV",          SYSCONF,    _SC_2_C_DEV       },
#else
  { "_POSIX2_C_DEV",          G_UNDEF,    -1                },
#endif
#if defined (_SC_2_C_VERSION)
  { "_POSIX2_C_VERSION",            SYSCONF,    _SC_2_C_VERSION         },
#else
  { "_POSIX2_C_VERSION",            G_UNDEF,    -1                },
#endif
#if defined (_SC_2_CHAR_TERM)
  { "_POSIX2_CHAR_TERM",            SYSCONF,    _SC_2_CHAR_TERM         },
#else
  { "_POSIX2_CHAR_TERM",            G_UNDEF,    -1                },
#endif
#ifdef _SC_2_FORT_DEV
  { "_POSIX2_FORT_DEV",       SYSCONF,    _SC_2_FORT_DEV          },
#else
  { "_POSIX2_FORT_DEV",       G_UNDEF,    -1                },
#endif
#ifdef _SC_2_FORT_RUN
  { "_POSIX2_FORT_RUN",       SYSCONF,    _SC_2_FORT_RUN          },
#else
  { "_POSIX2_FORT_RUN",       G_UNDEF,    -1                },
#endif
#ifdef _SC_2_LOCALEDEF
  { "_POSIX2_LOCALEDEF",      SYSCONF,    _SC_2_LOCALEDEF         },
#else
  { "_POSIX2_LOCALEDEF",      G_UNDEF,    -1                },
#endif
#ifdef _SC_2_SW_DEV
  { "_POSIX2_SW_DEV",         SYSCONF,    _SC_2_SW_DEV            },
#else
  { "_POSIX2_SW_DEV",         G_UNDEF,    -1                },
#endif
#if defined (_SC2_UPE)
  { "_POSIX2_UPE",            SYSCONF,    _SC_2_UPE         },
#else
  { "_POSIX2_UPE",            G_UNDEF,    -1                },
#endif
#if !defined (_POSIX2_VERSION) && defined (_SC_2_VERSION)
  { "_POSIX2_VERSION",        SYSCONF,    _SC_2_VERSION           },
#else
  { "_POSIX2_VERSION",        G_UNDEF,    -1                },
#endif
#if defined (_SC_REGEX_VERSION)
  { "REGEX_VERSION",          SYSCONF,    _SC_REGEX_VERSION },
#else
  { "REGEX_VERSION",          G_UNDEF,    -1                },
#endif

#if defined (_SC_2_PBS)
  { "_POSIX2_PBS",            SYSCONF,    _SC_2_PBS         },
  { "_POSIX2_PBS_ACCOUNTING", SYSCONF,    _SC_2_PBS_ACCOUNTING    },
  { "_POSIX2_PBS_LOCATE",     SYSCONF,    _SC_2_PBS_LOCATE  },
  { "_POSIX2_PBS_MESSAGE",    SYSCONF,    _SC_2_PBS_MESSAGE },
  { "_POSIX2_PBS_TRACK",      SYSCONF,    _SC_2_PBS_TRACK         },
#endif

  /* POSIX.1 Configurable System Variables */
#ifdef _SC_ARG_MAX
  { "ARG_MAX",                SYSCONF,    _SC_ARG_MAX             },
#endif
#ifdef _SC_CHILD_MAX
  { "CHILD_MAX",        SYSCONF,    _SC_CHILD_MAX           },
#endif
#ifdef _SC_CLK_TCK
  { "CLK_TCK",                SYSCONF,    _SC_CLK_TCK       },
#endif
#ifdef _SC_DELAYTIMER_MAX
  { "DELAYTIMER_MAX",         SYSCONF,    _SC_DELAYTIMER_MAX      },
#endif
#ifdef _SC_NGROUPS_MAX
  { "NGROUPS_MAX",            SYSCONF,    _SC_NGROUPS_MAX         },
#endif
#ifdef NZERO
  { "NZERO",                  CONSTANT,   NZERO             },
#endif
#ifdef _SC_OPEN_MAX
  { "OPEN_MAX",               SYSCONF,    _SC_OPEN_MAX            },
#endif
#ifdef PASS_MAX
  { "PASS_MAX",               CONSTANT,   PASS_MAX          },
#endif
#ifdef _SC_STREAM_MAX
  { "STREAM_MAX",       SYSCONF,    _SC_STREAM_MAX          },
#endif
#ifdef TMP_MAX
  { "TMP_MAX",                CONSTANT,   TMP_MAX                 },
#endif
#ifdef _SC_TZNAME_MAX
  { "TZNAME_MAX",       SYSCONF,    _SC_TZNAME_MAX          },
#endif

  /* POSIX.1 Optional Facility Configuration Values */
#if defined (_SC_ADVISORY_INFO)
  { "_POSIX_ADVISORY_INFO",   SYSCONF,    _SC_ADVISORY_INFO },
#endif
#if defined (_SC_ASYNCHRONOUS_IO)
  { "_POSIX_ASYNCHRONOUS_IO", SYSCONF,    _SC_ASYNCHRONOUS_IO     },
#endif
#if defined (_SC_BARRIERS)
  { "_POSIX_BARRIERS",        SYSCONF,    _SC_BARRIERS            },
#endif
#if defined (_SC_BASE)
  { "_POSIX_BASE",            SYSCONF,    _SC_BASE          },
#endif
#if defined (_SC_C_LANG_SUPPORT)
  { "_POSIX_C_LANG_SUPPORT",  SYSCONF,    _SC_C_LANG_SUPPORT      },
#endif
#if defined (_SC_C_LANG_SUPPORT_R)
  { "_POSIX_C_LANG_SUPPORT_R",      SYSCONF,    _SC_C_LANG_SUPPORT_R    },
#endif
#if defined (_SC_CLOCK_SELECTION)
  { "_POSIX_CLOCK_SELECTION", SYSCONF,    _SC_CLOCK_SELECTION     },
#endif
#if defined (_SC_CPUTIME)
  { "_POSIX_CPUTIME",         SYSCONF,    _SC_CPUTIME       },
#endif
#if defined (_SC_DEVICE_IO)
  { "_POSIX_DEVICE_IO",       SYSCONF,    _SC_DEVICE_IO           },
#endif
#if defined (_SC_DEVICE_SPECIFIC)
  { "_POSIX_DEVICE_SPECIFIC", SYSCONF,    _SC_DEVICE_SPECIFIC     },
#endif
#if defined (_SC_DEVICE_SPECIFIC_R)
  { "_POSIX_DEVICE_SPECIFIC_R",     SYSCONF,    _SC_DEVICE_SPECIFIC_R   },
#endif
#if defined (_SC_FD_MGMT)
  { "_POSIX_FD_MGMT",         SYSCONF,    _SC_FD_MGMT       },
#endif
#if defined (_SC_FIFO)
  { "_POSIX_FIFO",            SYSCONF,    _SC_FIFO          },
#endif
#if defined (_SC_FILE_ATTRIBUTES)
  { "_POSIX_FILE_ATTRIBUTES", SYSCONF,    _SC_FILE_ATTRIBUTES     },
#endif
#if defined (_SC_FILE_LOCKING)
  { "_POSIX_FILE_LOCKING",    SYSCONF,    _SC_FILE_LOCKING  },
#endif
#if defined (_SC_FILE_SYSTEM)
  { "_POSIX_FILE_SYSTEM",     SYSCONF,    _SC_FILE_SYSTEM         },
#endif
#if defined (_SC_FSYNC)
  { "_POSIX_FSYNC",           SYSCONF,    _SC_FSYNC         },
#endif
#if defined (_SC_JOB_CONTROL)
  { "_POSIX_JOB_CONTROL",     SYSCONF,    _SC_JOB_CONTROL   },
#endif
#if defined (_SC_MAPPED_FILES)
  { "_POSIX_MAPPED_FILES",    SYSCONF,    _SC_MAPPED_FILES  },
#endif
#if defined (_SC_MEMLOCK)
  { "_POSIX_MEMLOCK",         SYSCONF,    _SC_MEMLOCK       },
#endif
#if defined (_SC_MEMLOCK_RANGE)
  { "_POSIX_MEMLOCK_RANGE",   SYSCONF,    _SC_MEMLOCK_RANGE },
#endif
#if defined (_SC_MEMORY_PROTECTION)
  { "_POSIX_MEMORY_PROTECTION",     SYSCONF,    _SC_MEMORY_PROTECTION   },
#endif
#if defined (_SC_MESSAGE_PASSING)
  { "_POSIX_MESSAGE_PASSING", SYSCONF,    _SC_MESSAGE_PASSING     },
#endif
#if defined (_SC_MONOTONIC_CLOCK)
  { "_POSIX_MONOTONIC_CLOCK", SYSCONF,    _SC_MONOTONIC_CLOCK     },
#endif
#if defined (_SC_MULTI_PROCESS)
  { "_POSIX_MULTI_PROCESS",   SYSCONF,    _SC_MULTI_PROCESS },
#endif
#if defined (_SC_NETWORKING)
  { "_POSIX_NETWORKING",      SYSCONF,    _SC_NETWORKING          },
#endif
#if defined (_SC_PIPE)
  { "_POSIX_PIPE",            SYSCONF,    _SC_PIPE          },
#endif
#if defined (SC_PRIORITIZED_IO)
  { "_POSIX_PRIORITIZED_IO",  SYSCONF,    _SC_PRIORITIZED_IO      },
#endif
#if defined (_SC_PRIORITY_SCHEDULING)
  { "_POSIX_PRIORITY_SCHEDULING", SYSCONF,      _SC_PRIORITY_SCHEDULING },
#endif
#if defined (_SC_READER_WRITER_LOCKS)
  { "_POSIX_READER_WRITER_LOCKS", SYSCONF,      _SC_READER_WRITER_LOCKS },
#endif
#if defined (_SC_REALTIME_SIGNALS)
  { "_POSIX_REALTIME_SIGNALS",      SYSCONF,    _SC_REALTIME_SIGNALS    },
#endif
#if defined (_SC_REGEXP)
  { "_POSIX_REGEXP",          SYSCONF,    _SC_REGEXP        },
#endif
#if defined (_SC_SAVED_IDS)
  { "_POSIX_SAVED_IDS",       SYSCONF,    _SC_SAVED_IDS           },
#endif
#if defined (_SC_SEMAPHORES)
  { "_POSIX_SEMAPHORES",      SYSCONF,    _SC_SEMAPHORES          },
#endif
#if defined (_SC_SHARED_MEMORY_OBJECTS)
  { "_POSIX_SHARED_MEMORY_OBJECTS", SYSCONF,    _SC_SHARED_MEMORY_OBJECTS },
#endif
  { "_POSIX_SHELL",           CONSTANT,   1                 },
#if defined (_SC_SIGNALS)
  { "_POSIX_SIGNALS",         SYSCONF,    _SC_SIGNALS       },
#endif
#if defined (_SC_SINGLE_PROCESS)
  { "_POSIX_SINGLE_PROCESS",  SYSCONF,    _SC_SINGLE_PROCESS      },
#endif
#if defined (_SC_SPAWN)
  { "_POSIX_SPAWN",           SYSCONF,    _SC_SPAWN         },
#endif
#if defined (_SC_SPIN_LOCKS)
  { "_POSIX_SPIN_LOCKS",      SYSCONF,    _SC_SPIN_LOCKS          },
#endif
#if defined (_SC_SPORADIC_SERVER)
  { "_POSIX_SPORADIC_SERVER", SYSCONF,    _SC_SPORADIC_SERVER     },
#endif
#if defined (_SC_SYNCHRONIZED_IO)
  { "_POSIX_SYNCHRONIZED_IO", SYSCONF,    _SC_SYNCHRONIZED_IO     },
#endif
#if defined (_SC_SYSTEM_DATABASE)
  { "_POSIX_SYSTEM_DATABASE", SYSCONF,    _SC_SYSTEM_DATABASE     },
#endif
#if defined (_SC_SYSTEM_DATABASE_R)
  { "_POSIX_SYSTEM_DATABASE_R",     SYSCONF,    _SC_SYSTEM_DATABASE_R   },
#endif
#if defined (_SC_THREAD_ATTR_STACKADDR)
  { "_POSIX_THREAD_ATTR_STACKADDR", SYSCONF,    _SC_THREAD_ATTR_STACKADDR },
#endif
#if defined (_SC_THREAD_ATTR_STACKSIZE)
  { "_POSIX_THREAD_ATTR_STACKSIZE", SYSCONF,    _SC_THREAD_ATTR_STACKSIZE },
#endif
#if defined (_SC_THREAD_CPUTIME)
  { "_POSIX_THREAD_CPUTIME",  SYSCONF,    _SC_THREAD_CPUTIME },
#endif
#if defined (_SC_THREAD_PRIO_INHERIT)
  { "_POSIX_THREAD_PRIO_INHERIT", SYSCONF,      _SC_THREAD_PRIO_INHERIT },
#endif
#if defined (_SC_THREAD_PRIO_PROTECT)
  { "_POSIX_THREAD_PRIO_PROTECT", SYSCONF,      _SC_THREAD_PRIO_PROTECT },
#endif
#if defined (_SC_THREAD_PRIORITY_SCHEDULING)
  { "_POSIX_THREAD_PRIORITY_SCHEDULING", SYSCONF, _SC_THREAD_PRIORITY_SCHEDULING },
#endif
#if defined (_SC_THREAD_PROCESS_SHARED)
  { "_POSIX_THREAD_PROCESS_SHARED", SYSCONF,    _SC_THREAD_PROCESS_SHARED },
#endif
#if defined (_SC_THREAD_SAFE_FUNCTIONS)
  { "_POSIX_THREAD_SAFE_FUNCTIONS", SYSCONF,    _SC_THREAD_SAFE_FUNCTIONS },
#endif
#if defined (_SC_THREAD_SPORADIC_SERVER)
  { "_POSIX_THREAD_SPORADIC_SERVER", SYSCONF,   _SC_THREAD_SPORADIC_SERVER },
#endif
#if defined (_SC_THREADS)
  { "_POSIX_THREADS",         SYSCONF,    _SC_THREADS       },
#endif
#if defined (_SC_TIMEOUTS)
  { "_POSIX_TIMEOUTS",        SYSCONF,    _SC_TIMEOUTS            },
#endif
#if defined (_SC_TIMERS)
  { "_POSIX_TIMERS",          SYSCONF,    _SC_TIMERS        },
#endif
#if defined (_SC_TRACE)
  { "_POSIX_TRACE",           SYSCONF,    _SC_TRACE         },
#endif
#if defined (_SC_TRACE)
  { "_POSIX_TRACE_EVENT_FILTER",SYSCONF,  _SC_TRACE_EVENT_FILTER  },
#endif
#if defined (_SC_TRACE)
  { "_POSIX_TRACE_INHERIT",   SYSCONF,    _SC_TRACE_INHERIT },
#endif
#if defined (_SC_TRACE)
  { "_POSIX_TRACE_LOG",       SYSCONF,    _SC_TRACE_LOG           },
#endif
#if defined (_SC_TYPED_MEMORY_OBJECTS)
  { "_POSIX_TYPED_MEMORY_OBJECTS", SYSCONF,     _SC_TYPED_MEMORY_OBJECTS },
#endif
#if defined (_SC_VERSION)
  { "_POSIX_VERSION",         SYSCONF,    _SC_VERSION       },
#endif

  /* XPG 4.2 Configurable System Variables. */
#if defined (_SC_ATEXIT_MAX)
  { "ATEXIT_MAX",       SYSCONF,    _SC_ATEXIT_MAX          },
#endif
#if defined (_SC_GETGR_R_SIZE_MAX)
  { "GETGR_R_SIZE_MAX",       SYSCONF,    _SC_GETGR_R_SIZE_MAX    },
#endif
#if defined (_SC_GETPW_R_SIZE_MAX)
  { "GETPW_R_SIZE_MAX",       SYSCONF,    _SC_GETPW_R_SIZE_MAX    },
#endif
#if defined (_SC_HOST_NAME_MAX)
  { "HOST_NAME_MAX",          SYSCONF,    _SC_HOST_NAME_MAX },
#endif
#if defined (_SC_IOV_MAX)
  { "IOV_MAX",                SYSCONF,    _SC_IOV_MAX       },
#endif
#if defined (_SC_LOGIN_NAME_MAX)
  { "LOGIN_NAME_MAX",         SYSCONF,    _SC_LOGIN_NAME_MAX      },
#endif
#if defined (_SC_LOGNAME_MAX)
  { "LOGNAME_MAX",            SYSCONF,    _SC_LOGNAME_MAX         },
#endif
#if defined (_SC_PAGESIZE)
  { "PAGESIZE",               SYSCONF,    _SC_PAGESIZE            },
#endif
#if defined (_SC_PAGE_SIZE)
  { "PAGE_SIZE",        SYSCONF,    _SC_PAGE_SIZE           },
#endif
#if defined (_SC_SYMLOOP_MAX)
  { "SYMLOOP_MAX",            SYSCONF,    _SC_SYMLOOP_MAX         },
#endif
#if defined (_SC_TTY_NAME_MAX)
  { "TTY_NAME_MAX",           SYSCONF,    _SC_TTY_NAME_MAX  },
#endif
#if defined (_SC_USER_GROUPS)
  { "_POSIX_USER_GROUPS",     SYSCONF,    _SC_USER_GROUPS         },
#endif
#if defined (_SC_USER_GROUPS_R)
  { "_POSIX_USER_GROUPS_R",   SYSCONF,    _SC_USER_GROUPS_R },
#endif

#if defined (_SC_AIO_LISTIO_MAX)
  { "AIO_LISTIO_MAX",         SYSCONF,    _SC_AIO_LISTIO_MAX      },
#endif
#if defined (_SC_AIO_MAX)
  { "AIO_MAX",                SYSCONF,    _SC_AIO_MAX       },
#endif
#if defined (_SC_AIO_PRIO_DELTA_MAX)
  { "AIO_PRIO_DELTA_MAX",     SYSCONF,    _SC_AIO_PRIO_DELTA_MAX  },
#endif
#if defined (_SC_DELAYTIMER_MAX)
  { "DELAYTIMER_MAX",         SYSCONF,    _SC_DELAYTIMER_MAX      },
#endif
#if defined (_SC_MQ_OPEN_MAX)
  { "MQ_OPEN_MAX",            SYSCONF,    _SC_MQ_OPEN_MAX         },
#endif
#if defined (_SC_MQ_PRIO_MAX)
  { "MQ_PRIO_MAX",            SYSCONF,    _SC_MQ_PRIO_MAX         },
#endif
#if defined (_SC_RTSIG_MAX)
  { "RTSIG_MAX",        SYSCONF,    _SC_RTSIG_MAX           },
#endif
#if defined (_SC_SEM_NSEMS_MAX)
  { "SEM_NSEMS_MAX",          SYSCONF,    _SC_SEM_NSEMS_MAX },
#endif
#if defined (_SC_SEM_VALUE_MAX)
  { "SEM_VALUE_MAX",          SYSCONF,    _SC_SEM_VALUE_MAX },
#endif
#if defined (_SC_SIGQUEUE_MAX)
  { "SIGQUEUE_MAX",           SYSCONF,    _SC_SIGQUEUE_MAX  },
#endif
#if defined (_SC_TIMER_MAX)
  { "TIMER_MAX",        SYSCONF,    _SC_TIMER_MAX           },
#endif

#if defined (_SC_THREAD_DESTRUCTOR_ITERATIONS)
  { "PTHREAD_DESTRUCTOR_ITERATIONS", SYSCONF,   _SC_THREAD_DESTRUCTOR_ITERATIONS },
#endif
#if defined (_SC_THREAD_KEYS_MAX)
  { "PTHREAD_KEYS_MAX",       SYSCONF,    _SC_THREAD_KEYS_MAX },
#endif
#if defined (_SC_THREAD_STACK_MIN)
  { "PTHREAD_STACK_MIN",      SYSCONF,    _SC_THREAD_STACK_MIN },
#endif
#if defined (_SC_THREAD_THREADS_MAX)
  { "PTHREAD_THREADS_MAX",    SYSCONF,    _SC_THREAD_THREADS_MAX },
#endif

  /* XPG 4.2 (and later) Optional Facility Configuration Values */
#if defined (_SC_XOPEN_CRYPT)
  { "_XOPEN_CRYPT",           SYSCONF,    _SC_XOPEN_CRYPT         },
#endif
#if defined (_SC_XOPEN_ENH_I18N)
  { "_XOPEN_ENH_I18N",        SYSCONF,    _SC_XOPEN_ENH_I18N      },
#endif
#if defined (_SC_XOPEN_LEGACY)
  { "_XOPEN_LEGACY",          SYSCONF,    _SC_XOPEN_LEGACY  },
#endif /* _SC_XOPEN_LEGACY */
#if defined (_SC_XOPEN_REALTIME)
  { "_XOPEN_REALTIME",        SYSCONF,    _SC_XOPEN_REALTIME      },
#endif
#if defined (_SC_XOPEN_REALTIME_THREADS)
  { "_XOPEN_REALTIME_THREADS",      SYSCONF,    _SC_XOPEN_REALTIME_THREADS },
#endif
#if defined (_SC_XOPEN_SHM)
  { "_XOPEN_SHM",       SYSCONF,    _SC_XOPEN_SHM           },
#endif
#if defined (_SC_XOPEN_UNIX)
  { "_XOPEN_UNIX",            SYSCONF,    _SC_XOPEN_UNIX          },
#endif
#if defined (_SC_XOPEN_VERSION)
  { "_XOPEN_VERSION",         SYSCONF,    _SC_XOPEN_VERSION },
#endif
#if defined (_SC_XOPEN_XCU_VERSION)
  { "_XOPEN_XCU_VERSION",     SYSCONF,    _SC_XOPEN_XCU_VERSION   },
#endif
#if defined (_SC_XOPEN_XPG2)
  { "_XOPEN_XPG2",            SYSCONF,    _SC_XOPEN_XPG2          },
#endif
#if defined (_SC_XOPEN_XPG3)
  { "_XOPEN_XPG3",            SYSCONF,    _SC_XOPEN_XPG3          },
#endif
#if defined (_SC_XOPEN_XPG4)
  { "_XOPEN_XPG4",            SYSCONF,    _SC_XOPEN_XPG4          },
#endif
#if defined (_SC_XOPEN_XPG5)
  { "_XOPEN_XPG5",            SYSCONF,    _SC_XOPEN_XPG5          },
#endif

  /* POSIX.1 Configurable Pathname Values */
#ifdef _PC_LINK_MAX
  { "LINK_MAX",               PATHCONF,   _PC_LINK_MAX            },
#endif
#ifdef _PC_MAX_CANON
  { "MAX_CANON",        PATHCONF,   _PC_MAX_CANON           },
#endif
#ifdef _PC_MAX_INPUT
  { "MAX_INPUT",        PATHCONF,   _PC_MAX_INPUT           },
#endif
#ifdef _PC_NAMW_MAX
  { "NAME_MAX",               PATHCONF,   _PC_NAME_MAX            },
#endif
#ifdef _PC_PATH_MAX
  { "PATH_MAX",               PATHCONF,   _PC_PATH_MAX            },
#endif
#ifdef _PC_PIPE_BUF
  { "PIPE_BUF",               PATHCONF,   _PC_PIPE_BUF            },
#endif
#ifdef _PC_SYMLINK_MAX
  { "SYMLINK_MAX",            PATHCONF,   _PC_SYMLINK_MAX         },
#endif
#ifdef _PC_CHOWN_RESTRICTED
  { "_POSIX_CHOWN_RESTRICTED",      PATHCONF,   _PC_CHOWN_RESTRICTED    },
#endif
#ifdef _PC_NO_TRUNC
  { "_POSIX_NO_TRUNC",        PATHCONF,   _PC_NO_TRUNC            },
#endif
#ifdef _PC_VDISABLE
  { "_POSIX_VDISABLE",        PATHCONF,   _PC_VDISABLE            },
#endif

  /* XPG 4.2 Configurable Pathname Values */
#if defined (_PC_FILESIZEBITS)
  { "FILESIZEBITS",           PATHCONF,   _PC_FILESIZEBITS },
#endif
#if defined (_PC_ASYNC_IO)
  { "_POSIX_ASYNC_IO",        PATHCONF,   _PC_ASYNC_IO },
#endif
#if defined (_PC_PRIO_IO)
  { "_POSIX_PRIO_IO",         PATHCONF,   _PC_PRIO_IO },
#endif
#if defined (_PC_SYNC_IO)
  { "_POSIX_SYNC_IO",         PATHCONF,   _PC_SYNC_IO },
#endif

  /* POSIX.1-200x configurable pathname values */
#if defined (_PC_ALLOC_SIZE_MIN)
  { "POSIX_ALLOC_SIZE_MIN",   PATHCONF,   _PC_ALLOC_SIZE_MIN },
  { "POSIX_REC_INCR_XFER_SIZE",     PATHCONF,   _PC_REC_INCR_XFER_SIZE },
  { "POSIX_REC_MAX_XFER_SIZE",      PATHCONF,   _PC_REC_MAX_XFER_SIZE },
  { "POSIX_REC_MIN_XFER_SIZE",      PATHCONF,   _PC_REC_MIN_XFER_SIZE },
  { "POSIX_REC_XFER_ALIGN",   PATHCONF,   _PC_REC_XFER_ALIGN },
#endif

  /* ANSI/ISO C, POSIX.1-200x, XPG 4.2 (and later) C language type limits. */
  { "CHAR_BIT",               CONSTANT,   CHAR_BIT    },
  { "CHAR_MAX",               CONSTANT,   CHAR_MAX    },
  { "CHAR_MIN",               CONSTANT,   CHAR_MIN    },
  { "INT_BIT",                CONSTANT,   INT_BIT           },
  { "INT_MAX",                CONSTANT,   INT_MAX           },
  { "INT_MIN",                CONSTANT,   INT_MIN           },
  { "LONG_BIT",               CONSTANT,   LONG_BIT    },
  { "LONG_MAX",               CONSTANT,   LONG_MAX    },
  { "LONG_MIN",               CONSTANT,   LONG_MIN    },
#ifdef MB_LEN_MAX
  { "MB_LEN_MAX",       CONSTANT,   MB_LEN_MAX  },
#endif
  { "SCHAR_MAX",        CONSTANT,   SCHAR_MAX   },
  { "SCHAR_MIN",        CONSTANT,   SCHAR_MIN   },
  { "SHRT_MAX",               CONSTANT,   SHRT_MAX    },
  { "SHRT_MIN",               CONSTANT,   SHRT_MIN    },
  { "SIZE_MAX",               CONSTANT,   SIZE_MAX    },
  { "SSIZE_MAX",        CONSTANT,   SSIZE_MAX   },
  { "UCHAR_MAX",        CONSTANT,   UCHAR_MAX   },
  { "UINT_MAX",               CONSTANT,   UINT_MAX    },
  { "ULONG_MAX",        CONSTANT,   ULONG_MAX   },
  { "USHRT_MAX",        CONSTANT,   USHRT_MAX   },
  { "WORD_BIT",               CONSTANT,   WORD_BIT    },

  { NULL }
};

static int num_getconf_variables = sizeof(conf_table) / sizeof(struct conf_variable) - 1;

extern char *this_command_name;
extern char **make_builtin_argv ();

static void getconf_help ();
static int getconf_print ();
static int getconf_one ();
static int getconf_all ();

int
getconf_builtin (list)
     WORD_LIST *list;
{
  int c, r, opt, aflag;
  char **v;

  aflag = 0;
  reset_internal_getopt();
  while ((opt = internal_getopt (list, "ahv:")) != -1) {
      switch (opt) {
      case 'a':
            aflag = 1;
            break;
      case 'h':
            getconf_help();
            return(EXECUTION_SUCCESS);
      case 'v':
            break;            /* ignored */
      default:
            builtin_usage();
            return(EX_USAGE);
      }
  }
 
  list = loptend;
  if ((aflag == 0 && list == 0) || (aflag && list) || list_length(list) > 2) {
      builtin_usage();
      return(EX_USAGE);
  }

  r = aflag ? getconf_all() : getconf_one(list);

  return r;
}

static void
getconf_help()
{
      const struct conf_variable *cp;
      register int i, column;

      builtin_usage();
      printf("Acceptable variable names are:\n");
      for (cp = conf_table; cp->name != NULL; cp++) {
            if (cp->type == PATHCONF)
                  printf("%s pathname\n", cp->name);
            else
                  printf("%s\n", cp->name);
      }
}

static int
getconf_print(cp, vpath, all)
struct conf_variable *cp;
char *vpath;
int all;
{
      long val;
      char *sval;
      size_t slen;

      switch (cp->type) {
      case G_UNDEF:
            printf("undefined\n");
            break;

      case CONSTANT:
            switch (cp->value) {
                  case UCHAR_MAX:
                  case USHRT_MAX:
                  case UINT_MAX:
#if (ULONG_MAX != UINT_MAX)               
                  case ULONG_MAX:
#endif
#if (SIZE_MAX != UINT_MAX) && (SIZE_MAX != ULONG_MAX)
                  case SIZE_MAX:
#endif

                        printf("%lu\n", cp->value);
                        break;
                  default:
                        printf("%ld\n", cp->value);
                        break;
            }
            break;

      case CONFSTR:
            errno = 0;
            slen = confstr (cp->value, (char *) 0, (size_t) 0);
            if (slen == 0) {
                  if (errno != 0) {
                        if (all)
                              printf ("getconf: %s\n", strerror(errno));
                        else
                              builtin_error ("%s", strerror(errno));
                  } else
                        printf ("undefined\n");
                  return (EXECUTION_FAILURE);
            }
            sval = xmalloc(slen);

            confstr(cp->value, sval, slen);
            printf("%s\n", sval);
            free(sval);
            break;

      case SYSCONF:
            errno = 0;
            if ((val = sysconf(cp->value)) == -1) {
                  if (errno != 0) {
                        if (all)
                              printf("getconf: %s\n", strerror (errno));
                        else
                              builtin_error ("%s", strerror (errno));
                        return (EXECUTION_FAILURE);
                  }

                  printf ("undefined\n");
            } else {
                  printf("%ld\n", val);
            }
            break;

      case PATHCONF:
            errno = 0;
            if ((val = pathconf(vpath, cp->value)) == -1) {
                  if (errno != 0) {
                        if (all)
                              printf("getconf: %s: %s\n", vpath, strerror (errno));
                        else
                              builtin_error ("%s: %s", vpath, strerror (errno));
                        return (EXECUTION_FAILURE);
                  }

                  printf ("undefined\n");
            } else {
                  printf ("%ld\n", val);
            }
            break;
      }

      return (ferror(stdout) ? EXECUTION_FAILURE : EXECUTION_SUCCESS);
}

static int
getconf_all()
{
      const struct conf_variable *cp;
      int ret;

      ret = EXECUTION_SUCCESS;
      for (cp = conf_table; cp->name != NULL; cp++) {
            printf("%-35s", cp->name);
            if (getconf_print(cp, "/", 1) == EXECUTION_FAILURE)
                  ret = EXECUTION_FAILURE;
      }
      return ret;
}

static int
getconf_one(list)
      WORD_LIST *list;
{
      const struct conf_variable *cp;
      char *vname, *vpath;

      vname = list->word->word;
      vpath = (list->next && list->next->word) ? list->next->word->word
                                     : (char *)NULL;

      for (cp = conf_table; cp->name != NULL; cp++) {
            if (strcmp(vname, cp->name) == 0)
                  break;
      }
      if (cp->name == NULL) {
            builtin_error ("%s: unknown variable", vname);
            return (EXECUTION_FAILURE);
      }

      if (cp->type == PATHCONF) {
            if (list->next == 0) {
                  builtin_usage();
                  return(EX_USAGE);
            }
      } else {
            if (list->next) {
                  builtin_usage();
                  return(EX_USAGE);
            }
      }

      return (getconf_print(cp, vpath, 0));
}

static char *getconf_doc[] = {
      "getconf writes the current value of a configurable system limit or",
      "option variable to the standard output.",
      (char *)NULL
};

struct builtin getconf_struct = {
      "getconf",
      getconf_builtin,
      BUILTIN_ENABLED,
      getconf_doc,
      "getconf -[ah] or getconf [-v spec] sysvar or getconf [-v spec] pathvar pathname",
      0
};

#ifndef HAVE_CONFSTR
static size_t
confstr (name, buf, len)
     int name;
     char *buf;
     size_t len;
{
  switch (name)
    {
    case _CS_PATH:
      if (len > 0 && buf)
      {
          strncpy (buf, STANDARD_UTILS_PATH, len - 1);
          buf[len - 1] = '\0';
      }
      return (sizeof (STANDARD_UTILS_PATH) + 1);
    default:
      errno = EINVAL;
      return 0;
    }
}
#endif

#ifndef HAVE_SYSCONF
extern long get_clk_tck __P((void));

static long
sysconf (name)
     int name;
{
#  if defined (_POSIX_VERSION)
  switch (name)
    {
    case _SC_ARG_MAX:
      return _POSIX_ARG_MAX;
    case _SC_CHILD_MAX:
      return _POSIX_CHILD_MAX;
    case _SC_CLK_TCK:
      return get_clk_tck();
    case _SC_NGROUPS_MAX:
      return _POSIX_NGROUPS_MAX;
    case _SC_OPEN_MAX:
      return _POSIX_OPEN_MAX;
    case _SC_JOB_CONTROL:
      return _POSIX_JOB_CONTROL;
    case _SC_SAVED_IDS:
      return _POSIX_SAVED_IDS;
    case _SC_VERSION:
      return _POSIX_VERSION;
    case _SC_BC_BASE_MAX:
      return _POSIX2_BC_BASE_MAX;
    case _SC_BC_DIM_MAX:
      return _POSIX2_BC_DIM_MAX;
    case _SC_BC_SCALE_MAX:
      return  _POSIX2_BC_SCALE_MAX;
    case _SC_BC_STRING_MAX:
      return _POSIX2_BC_STRING_MAX;
    case _SC_COLL_WEIGHTS_MAX:
      return  -1;
    case _SC_EXPR_NEST_MAX:
      return _POSIX2_EXPR_NEST_MAX;
    case _SC_LINE_MAX:
      return _POSIX2_LINE_MAX;
    case _SC_RE_DUP_MAX:
      return _POSIX2_RE_DUP_MAX;
    case _SC_STREAM_MAX:
      return _POSIX_STREAM_MAX;
    case _SC_TZNAME_MAX:
      return _POSIX_TZNAME_MAX;
    default:
      errno = EINVAL;
      return -1;
    }
#else
  errno = EINVAL;
  return -1;
#endif
}
#endif

#ifndef HAVE_PATHCONF
static long
pathconf (path, name)
     const char *path;
     int name;
{
#if defined (_POSIX_VERSION)
  switch (name)
    {
    case _PC_LINK_MAX:
      return _POSIX_LINK_MAX;
    case _PC_MAX_CANON:
      return _POSIX_MAX_CANON;
    case _PC_MAX_INPUT:
      return _POSIX_MAX_INPUT;
    case _PC_NAME_MAX:
      return _POSIX_NAME_MAX;
    case _PC_PATH_MAX:
      return _POSIX_PATH_MAX;
    case _PC_PIPE_BUF:
      return _POSIX_PIPE_BUF;
    case _PC_CHOWN_RESTRICTED:
#ifdef _POSIX_CHOWN_RESTRICTED
      return _POSIX_CHOWN_RESTRICTED;
#else
      return -1;
#endif
    case _PC_NO_TRUNC:
#ifdef _POSIX_NO_TRUNC
      return _POSIX_NO_TRUNC;
#else
      return -1;
#endif
    case _PC_VDISABLE:
#ifdef _POSIX_VDISABLE
      return _POSIX_VDISABLE;
#else
      return -1;
#endif
    default:
      errno = EINVAL;
      return -1;
    }
#else
  errno = EINVAL;
  return -1;
#endif
}
#endif

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