[thirdparty/glibc.git] / posix / confstr.c

/* Copyright (C) 1991-2015 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 (name, buf, len)
     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)
Commit	Line	Data
b168057a	1	/* Copyright (C) 1991-2015 Free Software Foundation, Inc.
c84142e8 UD	2	This file is part of the GNU C Library.
	3
	4	The GNU C Library is free software; you can redistribute it and/or
41bdb6e2 AJ	5	modify it under the terms of the GNU Lesser General Public
	6	License as published by the Free Software Foundation; either
	7	version 2.1 of the License, or (at your option) any later version.
c84142e8 UD	8
	9	The GNU C Library is distributed in the hope that it will be useful,
	10	but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
41bdb6e2	12	Lesser General Public License for more details.
c84142e8	13
41bdb6e2	14	You should have received a copy of the GNU Lesser General Public
59ba27a6 PE	15	License along with the GNU C Library; if not, see
59ba27a6 PE	16	<http://www.gnu.org/licenses/>. */
28f540f4	17
28f540f4 RM	18	#include <stddef.h>
	19	#include <errno.h>
	20	#include <unistd.h>
	21	#include <string.h>
	22	#include <confstr.h>
2067577c	23	#include "../version.h"
50cbbaa9 SP	24
50cbbaa9 SP	25	#define NEED_SPEC_ARRAY 0
4a6aca7b	26	#include <posix-conf-vars.h>
28f540f4	27
04ea3b0f UD	28	/* If BUF is not NULL and LEN > 0, fill in at most LEN - 1 bytes
	29	of BUF with the value corresponding to NAME and zero-terminate BUF.
	30	Return the number of bytes required to hold NAME's entire value. */
28f540f4	31	size_t
c4029823 UD	32	confstr (name, buf, len)
	33	int name;
	34	char *buf;
	35	size_t len;
28f540f4	36	{
55ed5821 UD	37	const char *string = "";
55ed5821 UD	38	size_t string_len = 1;
d6a403f9 RM	39
	40	/* Note that this buffer must be large enough for the longest strings
	41	used below. */
ac4c54f0	42	char restenvs[4 * sizeof "POSIX_V7_LPBIG_OFFBIG"];
28f540f4 RM	43
	44	switch (name)
	45	{
	46	case _CS_PATH:
	47	{
c4029823	48	static const char cs_path[] = CS_PATH;
28f540f4	49	string = cs_path;
c4029823	50	string_len = sizeof (cs_path);
28f540f4 RM	51	}
	52	break;
	53
531f1ae0 JM	54	/* For _CS_V7_WIDTH_RESTRICTED_ENVS, _CS_V6_WIDTH_RESTRICTED_ENVS
	55	and _CS_V5_WIDTH_RESTRICTED_ENVS:
	56
	57	We have to return a newline-separated list of names of
	58	programming environments in which the widths of blksize_t,
26b62243 UD	59	cc_t, mode_t, nfds_t, pid_t, ptrdiff_t, size_t, speed_t,
	60	ssize_t, suseconds_t, tcflag_t, useconds_t, wchar_t, and
	61	wint_t types are no greater than the width of type long.
	62
531f1ae0 JM	63	Currently this means all environments that the system allows. */
	64
	65	#define START_ENV_GROUP(VERSION) \
	66	case _CS_##VERSION##_WIDTH_RESTRICTED_ENVS: \
ac4c54f0	67	string_len = 0;
531f1ae0 JM	68
	69	#define END_ENV_GROUP(VERSION) \
	70	restenvs[string_len++] = '\0'; \
	71	string = restenvs; \
26b62243 UD	72	break;
26b62243 UD	73
531f1ae0 JM	74	#define KNOWN_ABSENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
531f1ae0 JM	75	/* Empty. */
280f4add	76
531f1ae0 JM	77	#define KNOWN_PRESENT_ENV_STRING(STR) \
	78	if (string_len > 0) \
	79	restenvs[string_len++] = '\n'; \
	80	memcpy (restenvs + string_len, STR, \
	81	sizeof STR - 1); \
	82	string_len += sizeof STR - 1;
280f4add	83
531f1ae0 JM	84	#define KNOWN_PRESENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
531f1ae0 JM	85	KNOWN_PRESENT_ENV_STRING (#ENV_PREFIX "_" #SUFFIX)
26b62243	86
531f1ae0 JM	87	#define UNKNOWN_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
	88	if (__sysconf (_SC_##SC_PREFIX##_##SUFFIX) > 0) \
	89	{ \
	90	KNOWN_PRESENT_ENVIRONMENT (SC_PREFIX, ENV_PREFIX, SUFFIX) \
ac4c54f0	91	}
531f1ae0 JM	92
	93	#include "posix-envs.def"
	94
	95	#undef START_ENV_GROUP
	96	#undef END_ENV_GROUP
	97	#undef KNOWN_ABSENT_ENVIRONMENT
	98	#undef KNOWN_PRESENT_ENV_STRING
	99	#undef KNOWN_PRESENT_ENVIRONMENT
	100	#undef UNKNOWN_ENVIRONMENT
26b62243	101
28f367c4 UD	102	case _CS_XBS5_ILP32_OFF32_CFLAGS:
28f367c4 UD	103	case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:
26b62243	104	case _CS_POSIX_V7_ILP32_OFF32_CFLAGS:
28f367c4	105	#ifdef __ILP32_OFF32_CFLAGS
4a6aca7b	106	# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFF32)
9e68d85a	107	# error "__ILP32_OFF32_CFLAGS should not be defined"
4a6aca7b	108	# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFF32)
26b62243	109	if (__sysconf (_SC_V7_ILP32_OFF32) < 0)
f095bb72	110	break;
28f367c4 UD	111	# endif
	112	string = __ILP32_OFF32_CFLAGS;
	113	string_len = sizeof (__ILP32_OFF32_CFLAGS);
	114	#endif
	115	break;
	116
2c179ef0 AJ	117	case _CS_XBS5_ILP32_OFFBIG_CFLAGS:
2c179ef0 AJ	118	case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS:
26b62243	119	case _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS:
28f367c4	120	#ifdef __ILP32_OFFBIG_CFLAGS
4a6aca7b	121	# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFFBIG)
9e68d85a	122	# error "__ILP32_OFFBIG_CFLAGS should not be defined"
4a6aca7b	123	# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFFBIG)
26b62243	124	if (__sysconf (_SC_V7_ILP32_OFFBIG) < 0)
f095bb72	125	break;
28f367c4 UD	126	# endif
	127	string = __ILP32_OFFBIG_CFLAGS;
	128	string_len = sizeof (__ILP32_OFFBIG_CFLAGS);
	129	#endif
	130	break;
	131
	132	case _CS_XBS5_LP64_OFF64_CFLAGS:
	133	case _CS_POSIX_V6_LP64_OFF64_CFLAGS:
26b62243	134	case _CS_POSIX_V7_LP64_OFF64_CFLAGS:
28f367c4	135	#ifdef __LP64_OFF64_CFLAGS
4a6aca7b	136	# if CONF_IS_DEFINED_UNSET (_POSIX_V7_LP64_OFF64)
9e68d85a	137	# error "__LP64_OFF64_CFLAGS should not be defined"
4a6aca7b	138	# elif CONF_IS_UNDEFINED (_POSIX_V7_LP64_OFF64)
26b62243	139	if (__sysconf (_SC_V7_LP64_OFF64) < 0)
f095bb72	140	break;
28f367c4 UD	141	# endif
	142	string = __LP64_OFF64_CFLAGS;
	143	string_len = sizeof (__LP64_OFF64_CFLAGS);
	144	#endif
	145	break;
	146
	147	case _CS_XBS5_ILP32_OFF32_LDFLAGS:
	148	case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS:
26b62243	149	case _CS_POSIX_V7_ILP32_OFF32_LDFLAGS:
28f367c4	150	#ifdef __ILP32_OFF32_LDFLAGS
4a6aca7b	151	# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFF32 )
9e68d85a	152	# error "__ILP32_OFF32_LDFLAGS should not be defined"
4a6aca7b	153	# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFF32)
26b62243	154	if (__sysconf (_SC_V7_ILP32_OFF32) < 0)
f095bb72	155	break;
28f367c4 UD	156	# endif
	157	string = __ILP32_OFF32_LDFLAGS;
	158	string_len = sizeof (__ILP32_OFF32_LDFLAGS);
	159	#endif
	160	break;
	161
	162	case _CS_XBS5_ILP32_OFFBIG_LDFLAGS:
	163	case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:
26b62243	164	case _CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS:
28f367c4	165	#ifdef __ILP32_OFFBIG_LDFLAGS
4a6aca7b	166	# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFFBIG)
9e68d85a	167	# error "__ILP32_OFFBIG_LDFLAGS should not be defined"
4a6aca7b	168	# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFFBIG)
26b62243	169	if (__sysconf (_SC_V7_ILP32_OFFBIG) < 0)
f095bb72	170	break;
28f367c4 UD	171	# endif
	172	string = __ILP32_OFFBIG_LDFLAGS;
	173	string_len = sizeof (__ILP32_OFFBIG_LDFLAGS);
	174	#endif
	175	break;
	176
	177	case _CS_XBS5_LP64_OFF64_LDFLAGS:
	178	case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:
26b62243	179	case _CS_POSIX_V7_LP64_OFF64_LDFLAGS:
28f367c4	180	#ifdef __LP64_OFF64_LDFLAGS
4a6aca7b	181	# if CONF_IS_DEFINED_UNSET (_POSIX_V7_LP64_OFF64)
9e68d85a	182	# error "__LP64_OFF64_LDFLAGS should not be defined"
4a6aca7b	183	# elif CONF_IS_UNDEFINED (_POSIX_V7_LP64_OFF64)
26b62243	184	if (__sysconf (_SC_V7_LP64_OFF64) < 0)
f095bb72	185	break;
28f367c4 UD	186	# endif
	187	string = __LP64_OFF64_LDFLAGS;
	188	string_len = sizeof (__LP64_OFF64_LDFLAGS);
	189	#endif
	190	break;
	191
2c179ef0	192	case _CS_LFS_CFLAGS:
55ed5821	193	case _CS_LFS_LINTFLAGS:
4a6aca7b SP	194	#if (CONF_IS_DEFINED_SET (_POSIX_V6_ILP32_OFF32) \
4a6aca7b SP	195	&& CONF_IS_DEFINED_SET (_POSIX_V6_ILP32_OFFBIG))
28f367c4	196	# define __LFS_CFLAGS "-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
2c179ef0	197	/* Signal that we want the new ABI. */
28f367c4 UD	198	string = __LFS_CFLAGS;
28f367c4 UD	199	string_len = sizeof (__LFS_CFLAGS);
2c179ef0	200	#endif
28f367c4	201	break;
2c179ef0	202
dfd2257a UD	203	case _CS_LFS_LDFLAGS:
dfd2257a UD	204	case _CS_LFS_LIBS:
55ed5821 UD	205	/* No special libraries or linker flags needed. */
	206	break;
	207
dfd2257a UD	208	case _CS_LFS64_CFLAGS:
dfd2257a UD	209	case _CS_LFS64_LINTFLAGS:
28f367c4 UD	210	#define __LFS64_CFLAGS "-D_LARGEFILE64_SOURCE"
	211	string = __LFS64_CFLAGS;
	212	string_len = sizeof (__LFS64_CFLAGS);
55ed5821 UD	213	break;
55ed5821 UD	214
dfd2257a UD	215	case _CS_LFS64_LDFLAGS:
dfd2257a UD	216	case _CS_LFS64_LIBS:
55ed5821 UD	217	/* No special libraries or linker flags needed. */
55ed5821 UD	218	break;
86187531	219
86187531 UD	220	case _CS_XBS5_ILP32_OFF32_LIBS:
86187531 UD	221	case _CS_XBS5_ILP32_OFF32_LINTFLAGS:
86187531 UD	222	case _CS_XBS5_ILP32_OFFBIG_LIBS:
86187531 UD	223	case _CS_XBS5_ILP32_OFFBIG_LINTFLAGS:
86187531 UD	224	case _CS_XBS5_LP64_OFF64_LIBS:
	225	case _CS_XBS5_LP64_OFF64_LINTFLAGS:
	226	case _CS_XBS5_LPBIG_OFFBIG_CFLAGS:
	227	case _CS_XBS5_LPBIG_OFFBIG_LDFLAGS:
	228	case _CS_XBS5_LPBIG_OFFBIG_LIBS:
	229	case _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS:
d20f21a2	230
d20f21a2 UD	231	case _CS_POSIX_V6_ILP32_OFF32_LIBS:
d20f21a2 UD	232	case _CS_POSIX_V6_ILP32_OFF32_LINTFLAGS:
d20f21a2 UD	233	case _CS_POSIX_V6_ILP32_OFFBIG_LIBS:
d20f21a2 UD	234	case _CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS:
d20f21a2 UD	235	case _CS_POSIX_V6_LP64_OFF64_LIBS:
	236	case _CS_POSIX_V6_LP64_OFF64_LINTFLAGS:
	237	case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS:
	238	case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS:
	239	case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS:
	240	case _CS_POSIX_V6_LPBIG_OFFBIG_LINTFLAGS:
26b62243 UD	241
	242	case _CS_POSIX_V7_ILP32_OFF32_LIBS:
	243	case _CS_POSIX_V7_ILP32_OFF32_LINTFLAGS:
	244	case _CS_POSIX_V7_ILP32_OFFBIG_LIBS:
	245	case _CS_POSIX_V7_ILP32_OFFBIG_LINTFLAGS:
	246	case _CS_POSIX_V7_LP64_OFF64_LIBS:
	247	case _CS_POSIX_V7_LP64_OFF64_LINTFLAGS:
	248	case _CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS:
	249	case _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS:
	250	case _CS_POSIX_V7_LPBIG_OFFBIG_LIBS:
	251	case _CS_POSIX_V7_LPBIG_OFFBIG_LINTFLAGS:
af6f3906	252	/* GNU libc does not require special actions to use LFS functions. */
dfd2257a UD	253	break;
dfd2257a UD	254
2067577c UD	255	case _CS_GNU_LIBC_VERSION:
2067577c UD	256	string = "glibc " VERSION;
5461545a RM	257	string_len = sizeof ("glibc " VERSION);
5461545a RM	258	break;
2067577c UD	259
	260	case _CS_GNU_LIBPTHREAD_VERSION:
	261	#ifdef LIBPTHREAD_VERSION
	262	string = LIBPTHREAD_VERSION;
5461545a	263	string_len = sizeof LIBPTHREAD_VERSION;
2067577c UD	264	break;
	265	#else
	266	/* No thread library. */
	267	__set_errno (EINVAL);
	268	return 0;
	269	#endif
	270
f095bb72 UD	271	case _CS_V6_ENV:
	272	case _CS_V7_ENV:
	273	/* Maybe something else is needed in future. */
	274	string = "POSIXLY_CORRECT=1";
	275	string_len = sizeof ("POSIXLY_CORRECT=1");
	276	break;
	277
28f540f4	278	default:
c4029823	279	__set_errno (EINVAL);
28f540f4 RM	280	return 0;
	281	}
	282
04ea3b0f UD	283	if (len > 0 && buf != NULL)
	284	{
	285	if (string_len <= len)
	286	memcpy (buf, string, string_len);
	287	else
	288	{
	289	memcpy (buf, string, len - 1);
	290	buf[len - 1] = '\0';
	291	}
	292	}
28f540f4 RM	293	return string_len;
28f540f4 RM	294	}
c41f555e	295	libc_hidden_def (confstr)