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/* Copyright (C) 1991, 1996, 1997, 2000, 2001 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#define _GNU_SOURCE 1

#include <stddef.h>

#include <errno.h>

#include <unistd.h>

#include <string.h>

#include <confstr.h>

/* If BUF is not NULL and LEN > 0, fill in at most LEN - 1 bytes

   of BUF with the value corresponding to NAME and zero-terminate BUF.

   Return the number of bytes required to hold NAME's entire value.  */

size_t

confstr (name, buf, len)

     int name;

     char *buf;

     size_t len;

{

  const char *string;

  size_t string_len;

  switch (name)

    {

    case _CS_PATH:

      {

        static const char cs_path[] = CS_PATH;

        string = cs_path;

        string_len = sizeof (cs_path);

      }

      break;

    case _CS_V6_WIDTH_RESTRICTED_ENVS:

      /* We have to return a newline-separated list of named of

         programming environements in which the widths of blksize_t,

         cc_t, mode_t, nfds_t, pid_t, ptrdiff_t, size_t, speed_t,

         ssize_t, suseconds_t, tcflag_t, useconds_t, wchar_t, and

         wint_t types are no greater than the width of type long.

         Currently this means all environment which the system allows.  */

      {

        static const char restenvs[] =

#if _POSIX_V6_ILP32_OFF32 > 0

        "_POSIX_V6_ILP32_OFF32"

#endif

#if _POSIX_V6_ILP32_OFFBIG > 0

# if _POSIX_V6_ILP32_OFF32 > 0

        "\n"

# endif

        "_POSIX_V6_ILP32_OFFBIG"

#endif

#if _POSIX_V6_LP64_OFF64 > 0

# if _POSIX_V6_ILP32_OFF32 > 0 || _POSIX_V6_ILP32_OFFBIG > 0

        "\n"

# endif

        "_POSIX_V6_LP64_OFF64"

#endif

#if _POSIX_V6_LPBIG_OFFBIG > 0

# if _POSIX_V6_ILP32_OFF32 > 0 || _POSIX_V6_ILP32_OFFBIG > 0 \

     || _POSIX_V6_LP64_OFF64 > 0

        "\n"

# endif

        "_POSIX_V6_LPBIG_OFFBIG"

#endif

          ;

        string = restenvs;

        string_len = sizeof (restenvs);

      }

      break;

    case _CS_XBS5_ILP32_OFFBIG_CFLAGS:

    case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS:

    case _CS_LFS_CFLAGS:

#if _XBS5_LP64_OFF64 == -1 && _XBS5_LPBIG_OFFBIG == -1 && _XBS5_ILP32_OFFBIG == 1

      /* Signal that we want the new ABI.  */

      {

        static const char file_offset[] = "-D_FILE_OFFSET_BITS=64";

        string = file_offset;

        string_len = sizeof (file_offset);

      }

      break;

#endif

      /* FALLTHROUGH */

    case _CS_LFS_LINTFLAGS:

    case _CS_LFS_LDFLAGS:

    case _CS_LFS_LIBS:

    case _CS_LFS64_CFLAGS:

    case _CS_LFS64_LINTFLAGS:

    case _CS_LFS64_LDFLAGS:

    case _CS_LFS64_LIBS:

    case _CS_XBS5_ILP32_OFF32_CFLAGS:

    case _CS_XBS5_ILP32_OFF32_LDFLAGS:

    case _CS_XBS5_ILP32_OFF32_LIBS:

    case _CS_XBS5_ILP32_OFF32_LINTFLAGS:

    case _CS_XBS5_ILP32_OFFBIG_LDFLAGS:

    case _CS_XBS5_ILP32_OFFBIG_LIBS:

    case _CS_XBS5_ILP32_OFFBIG_LINTFLAGS:

    case _CS_XBS5_LP64_OFF64_CFLAGS:

    case _CS_XBS5_LP64_OFF64_LDFLAGS:

    case _CS_XBS5_LP64_OFF64_LIBS:

    case _CS_XBS5_LP64_OFF64_LINTFLAGS:

    case _CS_XBS5_LPBIG_OFFBIG_CFLAGS:

    case _CS_XBS5_LPBIG_OFFBIG_LDFLAGS:

    case _CS_XBS5_LPBIG_OFFBIG_LIBS:

    case _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS:

    case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:

    case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS:

    case _CS_POSIX_V6_ILP32_OFF32_LIBS:

    case _CS_POSIX_V6_ILP32_OFF32_LINTFLAGS:

    case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:

    case _CS_POSIX_V6_ILP32_OFFBIG_LIBS:

    case _CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS:

    case _CS_POSIX_V6_LP64_OFF64_CFLAGS:

    case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:

    case _CS_POSIX_V6_LP64_OFF64_LIBS:

    case _CS_POSIX_V6_LP64_OFF64_LINTFLAGS:

    case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS:

    case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS:

    case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS:

    case _CS_POSIX_V6_LPBIG_OFFBIG_LINTFLAGS:

      /* GNU libc does not require special actions to use LFS functions.  */

      string = "";

      string_len = 1;

      break;

    default:

      __set_errno (EINVAL);

      return 0;

    }

  if (len > 0 && buf != NULL)

    {

      if (string_len <= len)

        memcpy (buf, string, string_len);

      else

        {

          memcpy (buf, string, len - 1);

          buf[len - 1] = '\0';

        }

    }

  return string_len;

}