ap/libc/glibc/glibc-2.23/posix/confstr.c - T106_DC - Gitiles

 /* Copyright (C) 1991-2016 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, see
    <http://www.gnu.org/licenses/>.  */

 #include <stddef.h>
 #include <errno.h>
 #include <unistd.h>
 #include <string.h>
 #include <confstr.h>
 #include "../version.h"

 #define NEED_SPEC_ARRAY 0
 #include <posix-conf-vars.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 (int name, char *buf, size_t len)
 {
   const char *string = "";
   size_t string_len = 1;

   /* Note that this buffer must be large enough for the longest strings
      used below.  */
   char restenvs[4 * sizeof "POSIX_V7_LPBIG_OFFBIG"];

   switch (name)
     {
     case _CS_PATH:
       {
 	static const char cs_path[] = CS_PATH;
 	string = cs_path;
 	string_len = sizeof (cs_path);
       }
       break;

       /* For _CS_V7_WIDTH_RESTRICTED_ENVS, _CS_V6_WIDTH_RESTRICTED_ENVS
 	 and _CS_V5_WIDTH_RESTRICTED_ENVS:

 	 We have to return a newline-separated list of names of
 	 programming environments 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 environments that the system allows.  */

 #define START_ENV_GROUP(VERSION)		\
     case _CS_##VERSION##_WIDTH_RESTRICTED_ENVS:	\
       string_len = 0;

 #define END_ENV_GROUP(VERSION)			\
       restenvs[string_len++] = '\0';		\
       string = restenvs;			\
       break;

 #define KNOWN_ABSENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX)	\
       /* Empty.  */

 #define KNOWN_PRESENT_ENV_STRING(STR)		\
       if (string_len > 0)			\
 	restenvs[string_len++] = '\n';		\
       memcpy (restenvs + string_len, STR,	\
 	      sizeof STR - 1);			\
       string_len += sizeof STR - 1;

 #define KNOWN_PRESENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX)	\
       KNOWN_PRESENT_ENV_STRING (#ENV_PREFIX "_" #SUFFIX)

 #define UNKNOWN_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX)		\
       if (__sysconf (_SC_##SC_PREFIX##_##SUFFIX) > 0)			\
 	{								\
 	  KNOWN_PRESENT_ENVIRONMENT (SC_PREFIX, ENV_PREFIX, SUFFIX)	\
 	}

 #include "posix-envs.def"

 #undef START_ENV_GROUP
 #undef END_ENV_GROUP
 #undef KNOWN_ABSENT_ENVIRONMENT
 #undef KNOWN_PRESENT_ENV_STRING
 #undef KNOWN_PRESENT_ENVIRONMENT
 #undef UNKNOWN_ENVIRONMENT

     case _CS_XBS5_ILP32_OFF32_CFLAGS:
     case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:
     case _CS_POSIX_V7_ILP32_OFF32_CFLAGS:
 #ifdef __ILP32_OFF32_CFLAGS
 # if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFF32)
 #  error "__ILP32_OFF32_CFLAGS should not be defined"
 # elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFF32)
       if (__sysconf (_SC_V7_ILP32_OFF32) < 0)
 	break;
 # endif
       string = __ILP32_OFF32_CFLAGS;
       string_len = sizeof (__ILP32_OFF32_CFLAGS);
 #endif
       break;

     case _CS_XBS5_ILP32_OFFBIG_CFLAGS:
     case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS:
     case _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS:
 #ifdef __ILP32_OFFBIG_CFLAGS
 # if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFFBIG)
 #  error "__ILP32_OFFBIG_CFLAGS should not be defined"
 # elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFFBIG)
       if (__sysconf (_SC_V7_ILP32_OFFBIG) < 0)
 	break;
 # endif
       string = __ILP32_OFFBIG_CFLAGS;
       string_len = sizeof (__ILP32_OFFBIG_CFLAGS);
 #endif
       break;

     case _CS_XBS5_LP64_OFF64_CFLAGS:
     case _CS_POSIX_V6_LP64_OFF64_CFLAGS:
     case _CS_POSIX_V7_LP64_OFF64_CFLAGS:
 #ifdef __LP64_OFF64_CFLAGS
 # if CONF_IS_DEFINED_UNSET (_POSIX_V7_LP64_OFF64)
 #  error "__LP64_OFF64_CFLAGS should not be defined"
 # elif CONF_IS_UNDEFINED (_POSIX_V7_LP64_OFF64)
       if (__sysconf (_SC_V7_LP64_OFF64) < 0)
 	break;
 # endif
       string = __LP64_OFF64_CFLAGS;
       string_len = sizeof (__LP64_OFF64_CFLAGS);
 #endif
       break;

     case _CS_XBS5_ILP32_OFF32_LDFLAGS:
     case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS:
     case _CS_POSIX_V7_ILP32_OFF32_LDFLAGS:
 #ifdef __ILP32_OFF32_LDFLAGS
 # if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFF32 )
 #  error "__ILP32_OFF32_LDFLAGS should not be defined"
 # elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFF32)
       if (__sysconf (_SC_V7_ILP32_OFF32) < 0)
 	break;
 # endif
       string = __ILP32_OFF32_LDFLAGS;
       string_len = sizeof (__ILP32_OFF32_LDFLAGS);
 #endif
       break;

     case _CS_XBS5_ILP32_OFFBIG_LDFLAGS:
     case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:
     case _CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS:
 #ifdef __ILP32_OFFBIG_LDFLAGS
 # if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFFBIG)
 #  error "__ILP32_OFFBIG_LDFLAGS should not be defined"
 # elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFFBIG)
       if (__sysconf (_SC_V7_ILP32_OFFBIG) < 0)
 	break;
 # endif
       string = __ILP32_OFFBIG_LDFLAGS;
       string_len = sizeof (__ILP32_OFFBIG_LDFLAGS);
 #endif
       break;

     case _CS_XBS5_LP64_OFF64_LDFLAGS:
     case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:
     case _CS_POSIX_V7_LP64_OFF64_LDFLAGS:
 #ifdef __LP64_OFF64_LDFLAGS
 # if CONF_IS_DEFINED_UNSET (_POSIX_V7_LP64_OFF64)
 #  error "__LP64_OFF64_LDFLAGS should not be defined"
 # elif CONF_IS_UNDEFINED (_POSIX_V7_LP64_OFF64)
       if (__sysconf (_SC_V7_LP64_OFF64) < 0)
 	break;
 # endif
       string = __LP64_OFF64_LDFLAGS;
       string_len = sizeof (__LP64_OFF64_LDFLAGS);
 #endif
       break;

     case _CS_LFS_CFLAGS:
     case _CS_LFS_LINTFLAGS:
 #if (CONF_IS_DEFINED_SET (_POSIX_V6_ILP32_OFF32) \
      && CONF_IS_DEFINED_SET (_POSIX_V6_ILP32_OFFBIG))
 # define __LFS_CFLAGS "-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
       /* Signal that we want the new ABI.  */
       string = __LFS_CFLAGS;
       string_len = sizeof (__LFS_CFLAGS);
 #endif
       break;

     case _CS_LFS_LDFLAGS:
     case _CS_LFS_LIBS:
       /* No special libraries or linker flags needed.  */
       break;

     case _CS_LFS64_CFLAGS:
     case _CS_LFS64_LINTFLAGS:
 #define __LFS64_CFLAGS "-D_LARGEFILE64_SOURCE"
       string = __LFS64_CFLAGS;
       string_len = sizeof (__LFS64_CFLAGS);
       break;

     case _CS_LFS64_LDFLAGS:
     case _CS_LFS64_LIBS:
       /* No special libraries or linker flags needed.  */
       break;

     case _CS_XBS5_ILP32_OFF32_LIBS:
     case _CS_XBS5_ILP32_OFF32_LINTFLAGS:
     case _CS_XBS5_ILP32_OFFBIG_LIBS:
     case _CS_XBS5_ILP32_OFFBIG_LINTFLAGS:
     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_LIBS:
     case _CS_POSIX_V6_ILP32_OFF32_LINTFLAGS:
     case _CS_POSIX_V6_ILP32_OFFBIG_LIBS:
     case _CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS:
     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:

     case _CS_POSIX_V7_ILP32_OFF32_LIBS:
     case _CS_POSIX_V7_ILP32_OFF32_LINTFLAGS:
     case _CS_POSIX_V7_ILP32_OFFBIG_LIBS:
     case _CS_POSIX_V7_ILP32_OFFBIG_LINTFLAGS:
     case _CS_POSIX_V7_LP64_OFF64_LIBS:
     case _CS_POSIX_V7_LP64_OFF64_LINTFLAGS:
     case _CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS:
     case _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS:
     case _CS_POSIX_V7_LPBIG_OFFBIG_LIBS:
     case _CS_POSIX_V7_LPBIG_OFFBIG_LINTFLAGS:
       /* GNU libc does not require special actions to use LFS functions.  */
       break;

     case _CS_GNU_LIBC_VERSION:
       string = "glibc " VERSION;
       string_len = sizeof ("glibc " VERSION);
       break;

     case _CS_GNU_LIBPTHREAD_VERSION:
 #ifdef LIBPTHREAD_VERSION
       string = LIBPTHREAD_VERSION;
       string_len = sizeof LIBPTHREAD_VERSION;
       break;
 #else
       /* No thread library.  */
       __set_errno (EINVAL);
       return 0;
 #endif

     case _CS_V6_ENV:
     case _CS_V7_ENV:
       /* Maybe something else is needed in future.  */
       string = "POSIXLY_CORRECT=1";
       string_len = sizeof ("POSIXLY_CORRECT=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;
 }
 libc_hidden_def (confstr)
	/* Copyright (C) 1991-2016 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, see
	<http://www.gnu.org/licenses/>. */

	#include <stddef.h>
	#include <errno.h>
	#include <unistd.h>
	#include <string.h>
	#include <confstr.h>
	#include "../version.h"

	#define NEED_SPEC_ARRAY 0
	#include <posix-conf-vars.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 (int name, char *buf, size_t len)
	{
	const char *string = "";
	size_t string_len = 1;

	/* Note that this buffer must be large enough for the longest strings
	used below. */
	char restenvs[4 * sizeof "POSIX_V7_LPBIG_OFFBIG"];

	switch (name)
	{
	case _CS_PATH:
	{
	static const char cs_path[] = CS_PATH;
	string = cs_path;
	string_len = sizeof (cs_path);
	}
	break;

	/* For _CS_V7_WIDTH_RESTRICTED_ENVS, _CS_V6_WIDTH_RESTRICTED_ENVS
	and _CS_V5_WIDTH_RESTRICTED_ENVS:

	We have to return a newline-separated list of names of
	programming environments 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 environments that the system allows. */

	#define START_ENV_GROUP(VERSION) \
	case _CS_##VERSION##_WIDTH_RESTRICTED_ENVS: \
	string_len = 0;

	#define END_ENV_GROUP(VERSION) \
	restenvs[string_len++] = '\0'; \
	string = restenvs; \
	break;

	#define KNOWN_ABSENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
	/* Empty. */

	#define KNOWN_PRESENT_ENV_STRING(STR) \
	if (string_len > 0) \
	restenvs[string_len++] = '\n'; \
	memcpy (restenvs + string_len, STR, \
	sizeof STR - 1); \
	string_len += sizeof STR - 1;

	#define KNOWN_PRESENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
	KNOWN_PRESENT_ENV_STRING (#ENV_PREFIX "_" #SUFFIX)

	#define UNKNOWN_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
	if (__sysconf (_SC_##SC_PREFIX##_##SUFFIX) > 0) \
	{ \
	KNOWN_PRESENT_ENVIRONMENT (SC_PREFIX, ENV_PREFIX, SUFFIX) \
	}

	#include "posix-envs.def"

	#undef START_ENV_GROUP
	#undef END_ENV_GROUP
	#undef KNOWN_ABSENT_ENVIRONMENT
	#undef KNOWN_PRESENT_ENV_STRING
	#undef KNOWN_PRESENT_ENVIRONMENT
	#undef UNKNOWN_ENVIRONMENT

	case _CS_XBS5_ILP32_OFF32_CFLAGS:
	case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:
	case _CS_POSIX_V7_ILP32_OFF32_CFLAGS:
	#ifdef __ILP32_OFF32_CFLAGS
	# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFF32)
	# error "__ILP32_OFF32_CFLAGS should not be defined"
	# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFF32)
	if (__sysconf (_SC_V7_ILP32_OFF32) < 0)
	break;
	# endif
	string = __ILP32_OFF32_CFLAGS;
	string_len = sizeof (__ILP32_OFF32_CFLAGS);
	#endif
	break;

	case _CS_XBS5_ILP32_OFFBIG_CFLAGS:
	case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS:
	case _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS:
	#ifdef __ILP32_OFFBIG_CFLAGS
	# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFFBIG)
	# error "__ILP32_OFFBIG_CFLAGS should not be defined"
	# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFFBIG)
	if (__sysconf (_SC_V7_ILP32_OFFBIG) < 0)
	break;
	# endif
	string = __ILP32_OFFBIG_CFLAGS;
	string_len = sizeof (__ILP32_OFFBIG_CFLAGS);
	#endif
	break;

	case _CS_XBS5_LP64_OFF64_CFLAGS:
	case _CS_POSIX_V6_LP64_OFF64_CFLAGS:
	case _CS_POSIX_V7_LP64_OFF64_CFLAGS:
	#ifdef __LP64_OFF64_CFLAGS
	# if CONF_IS_DEFINED_UNSET (_POSIX_V7_LP64_OFF64)
	# error "__LP64_OFF64_CFLAGS should not be defined"
	# elif CONF_IS_UNDEFINED (_POSIX_V7_LP64_OFF64)
	if (__sysconf (_SC_V7_LP64_OFF64) < 0)
	break;
	# endif
	string = __LP64_OFF64_CFLAGS;
	string_len = sizeof (__LP64_OFF64_CFLAGS);
	#endif
	break;

	case _CS_XBS5_ILP32_OFF32_LDFLAGS:
	case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS:
	case _CS_POSIX_V7_ILP32_OFF32_LDFLAGS:
	#ifdef __ILP32_OFF32_LDFLAGS
	# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFF32 )
	# error "__ILP32_OFF32_LDFLAGS should not be defined"
	# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFF32)
	if (__sysconf (_SC_V7_ILP32_OFF32) < 0)
	break;
	# endif
	string = __ILP32_OFF32_LDFLAGS;
	string_len = sizeof (__ILP32_OFF32_LDFLAGS);
	#endif
	break;

	case _CS_XBS5_ILP32_OFFBIG_LDFLAGS:
	case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:
	case _CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS:
	#ifdef __ILP32_OFFBIG_LDFLAGS
	# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFFBIG)
	# error "__ILP32_OFFBIG_LDFLAGS should not be defined"
	# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFFBIG)
	if (__sysconf (_SC_V7_ILP32_OFFBIG) < 0)
	break;
	# endif
	string = __ILP32_OFFBIG_LDFLAGS;
	string_len = sizeof (__ILP32_OFFBIG_LDFLAGS);
	#endif
	break;

	case _CS_XBS5_LP64_OFF64_LDFLAGS:
	case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:
	case _CS_POSIX_V7_LP64_OFF64_LDFLAGS:
	#ifdef __LP64_OFF64_LDFLAGS
	# if CONF_IS_DEFINED_UNSET (_POSIX_V7_LP64_OFF64)
	# error "__LP64_OFF64_LDFLAGS should not be defined"
	# elif CONF_IS_UNDEFINED (_POSIX_V7_LP64_OFF64)
	if (__sysconf (_SC_V7_LP64_OFF64) < 0)
	break;
	# endif
	string = __LP64_OFF64_LDFLAGS;
	string_len = sizeof (__LP64_OFF64_LDFLAGS);
	#endif
	break;

	case _CS_LFS_CFLAGS:
	case _CS_LFS_LINTFLAGS:
	#if (CONF_IS_DEFINED_SET (_POSIX_V6_ILP32_OFF32) \
	&& CONF_IS_DEFINED_SET (_POSIX_V6_ILP32_OFFBIG))
	# define __LFS_CFLAGS "-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
	/* Signal that we want the new ABI. */
	string = __LFS_CFLAGS;
	string_len = sizeof (__LFS_CFLAGS);
	#endif
	break;

	case _CS_LFS_LDFLAGS:
	case _CS_LFS_LIBS:
	/* No special libraries or linker flags needed. */
	break;

	case _CS_LFS64_CFLAGS:
	case _CS_LFS64_LINTFLAGS:
	#define __LFS64_CFLAGS "-D_LARGEFILE64_SOURCE"
	string = __LFS64_CFLAGS;
	string_len = sizeof (__LFS64_CFLAGS);
	break;

	case _CS_LFS64_LDFLAGS:
	case _CS_LFS64_LIBS:
	/* No special libraries or linker flags needed. */
	break;

	case _CS_XBS5_ILP32_OFF32_LIBS:
	case _CS_XBS5_ILP32_OFF32_LINTFLAGS:
	case _CS_XBS5_ILP32_OFFBIG_LIBS:
	case _CS_XBS5_ILP32_OFFBIG_LINTFLAGS:
	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_LIBS:
	case _CS_POSIX_V6_ILP32_OFF32_LINTFLAGS:
	case _CS_POSIX_V6_ILP32_OFFBIG_LIBS:
	case _CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS:
	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:

	case _CS_POSIX_V7_ILP32_OFF32_LIBS:
	case _CS_POSIX_V7_ILP32_OFF32_LINTFLAGS:
	case _CS_POSIX_V7_ILP32_OFFBIG_LIBS:
	case _CS_POSIX_V7_ILP32_OFFBIG_LINTFLAGS:
	case _CS_POSIX_V7_LP64_OFF64_LIBS:
	case _CS_POSIX_V7_LP64_OFF64_LINTFLAGS:
	case _CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS:
	case _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS:
	case _CS_POSIX_V7_LPBIG_OFFBIG_LIBS:
	case _CS_POSIX_V7_LPBIG_OFFBIG_LINTFLAGS:
	/* GNU libc does not require special actions to use LFS functions. */
	break;

	case _CS_GNU_LIBC_VERSION:
	string = "glibc " VERSION;
	string_len = sizeof ("glibc " VERSION);
	break;

	case _CS_GNU_LIBPTHREAD_VERSION:
	#ifdef LIBPTHREAD_VERSION
	string = LIBPTHREAD_VERSION;
	string_len = sizeof LIBPTHREAD_VERSION;
	break;
	#else
	/* No thread library. */
	__set_errno (EINVAL);
	return 0;
	#endif

	case _CS_V6_ENV:
	case _CS_V7_ENV:
	/* Maybe something else is needed in future. */
	string = "POSIXLY_CORRECT=1";
	string_len = sizeof ("POSIXLY_CORRECT=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;
	}
	libc_hidden_def (confstr)