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

/* Copyright (C) 1991-2017 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)
Commit	Line	Data
bfff8b1b	1	/* Copyright (C) 1991-2017 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
9d46370c	32	confstr (int name, char *buf, size_t len)
28f540f4	33	{
55ed5821 UD	34	const char *string = "";
55ed5821 UD	35	size_t string_len = 1;
d6a403f9 RM	36
	37	/* Note that this buffer must be large enough for the longest strings
	38	used below. */
ac4c54f0	39	char restenvs[4 * sizeof "POSIX_V7_LPBIG_OFFBIG"];
28f540f4 RM	40
	41	switch (name)
	42	{
	43	case _CS_PATH:
	44	{
c4029823	45	static const char cs_path[] = CS_PATH;
28f540f4	46	string = cs_path;
c4029823	47	string_len = sizeof (cs_path);
28f540f4 RM	48	}
	49	break;
	50
531f1ae0 JM	51	/* For _CS_V7_WIDTH_RESTRICTED_ENVS, _CS_V6_WIDTH_RESTRICTED_ENVS
	52	and _CS_V5_WIDTH_RESTRICTED_ENVS:
	53
	54	We have to return a newline-separated list of names of
	55	programming environments in which the widths of blksize_t,
26b62243 UD	56	cc_t, mode_t, nfds_t, pid_t, ptrdiff_t, size_t, speed_t,
	57	ssize_t, suseconds_t, tcflag_t, useconds_t, wchar_t, and
	58	wint_t types are no greater than the width of type long.
	59
531f1ae0 JM	60	Currently this means all environments that the system allows. */
	61
	62	#define START_ENV_GROUP(VERSION) \
	63	case _CS_##VERSION##_WIDTH_RESTRICTED_ENVS: \
ac4c54f0	64	string_len = 0;
531f1ae0 JM	65
	66	#define END_ENV_GROUP(VERSION) \
	67	restenvs[string_len++] = '\0'; \
	68	string = restenvs; \
26b62243 UD	69	break;
26b62243 UD	70
531f1ae0 JM	71	#define KNOWN_ABSENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
531f1ae0 JM	72	/* Empty. */
280f4add	73
531f1ae0 JM	74	#define KNOWN_PRESENT_ENV_STRING(STR) \
	75	if (string_len > 0) \
	76	restenvs[string_len++] = '\n'; \
	77	memcpy (restenvs + string_len, STR, \
	78	sizeof STR - 1); \
	79	string_len += sizeof STR - 1;
280f4add	80
531f1ae0 JM	81	#define KNOWN_PRESENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
531f1ae0 JM	82	KNOWN_PRESENT_ENV_STRING (#ENV_PREFIX "_" #SUFFIX)
26b62243	83
531f1ae0 JM	84	#define UNKNOWN_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
	85	if (__sysconf (_SC_##SC_PREFIX##_##SUFFIX) > 0) \
	86	{ \
	87	KNOWN_PRESENT_ENVIRONMENT (SC_PREFIX, ENV_PREFIX, SUFFIX) \
ac4c54f0	88	}
531f1ae0 JM	89
	90	#include "posix-envs.def"
	91
	92	#undef START_ENV_GROUP
	93	#undef END_ENV_GROUP
	94	#undef KNOWN_ABSENT_ENVIRONMENT
	95	#undef KNOWN_PRESENT_ENV_STRING
	96	#undef KNOWN_PRESENT_ENVIRONMENT
	97	#undef UNKNOWN_ENVIRONMENT
26b62243	98
28f367c4 UD	99	case _CS_XBS5_ILP32_OFF32_CFLAGS:
28f367c4 UD	100	case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:
26b62243	101	case _CS_POSIX_V7_ILP32_OFF32_CFLAGS:
28f367c4	102	#ifdef __ILP32_OFF32_CFLAGS
4a6aca7b	103	# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFF32)
9e68d85a	104	# error "__ILP32_OFF32_CFLAGS should not be defined"
4a6aca7b	105	# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFF32)
26b62243	106	if (__sysconf (_SC_V7_ILP32_OFF32) < 0)
f095bb72	107	break;
28f367c4 UD	108	# endif
	109	string = __ILP32_OFF32_CFLAGS;
	110	string_len = sizeof (__ILP32_OFF32_CFLAGS);
	111	#endif
	112	break;
	113
2c179ef0 AJ	114	case _CS_XBS5_ILP32_OFFBIG_CFLAGS:
2c179ef0 AJ	115	case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS:
26b62243	116	case _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS:
28f367c4	117	#ifdef __ILP32_OFFBIG_CFLAGS
4a6aca7b	118	# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFFBIG)
9e68d85a	119	# error "__ILP32_OFFBIG_CFLAGS should not be defined"
4a6aca7b	120	# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFFBIG)
26b62243	121	if (__sysconf (_SC_V7_ILP32_OFFBIG) < 0)
f095bb72	122	break;
28f367c4 UD	123	# endif
	124	string = __ILP32_OFFBIG_CFLAGS;
	125	string_len = sizeof (__ILP32_OFFBIG_CFLAGS);
	126	#endif
	127	break;
	128
	129	case _CS_XBS5_LP64_OFF64_CFLAGS:
	130	case _CS_POSIX_V6_LP64_OFF64_CFLAGS:
26b62243	131	case _CS_POSIX_V7_LP64_OFF64_CFLAGS:
28f367c4	132	#ifdef __LP64_OFF64_CFLAGS
4a6aca7b	133	# if CONF_IS_DEFINED_UNSET (_POSIX_V7_LP64_OFF64)
9e68d85a	134	# error "__LP64_OFF64_CFLAGS should not be defined"
4a6aca7b	135	# elif CONF_IS_UNDEFINED (_POSIX_V7_LP64_OFF64)
26b62243	136	if (__sysconf (_SC_V7_LP64_OFF64) < 0)
f095bb72	137	break;
28f367c4 UD	138	# endif
	139	string = __LP64_OFF64_CFLAGS;
	140	string_len = sizeof (__LP64_OFF64_CFLAGS);
	141	#endif
	142	break;
	143
	144	case _CS_XBS5_ILP32_OFF32_LDFLAGS:
	145	case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS:
26b62243	146	case _CS_POSIX_V7_ILP32_OFF32_LDFLAGS:
28f367c4	147	#ifdef __ILP32_OFF32_LDFLAGS
4a6aca7b	148	# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFF32 )
9e68d85a	149	# error "__ILP32_OFF32_LDFLAGS should not be defined"
4a6aca7b	150	# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFF32)
26b62243	151	if (__sysconf (_SC_V7_ILP32_OFF32) < 0)
f095bb72	152	break;
28f367c4 UD	153	# endif
	154	string = __ILP32_OFF32_LDFLAGS;
	155	string_len = sizeof (__ILP32_OFF32_LDFLAGS);
	156	#endif
	157	break;
	158
	159	case _CS_XBS5_ILP32_OFFBIG_LDFLAGS:
	160	case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:
26b62243	161	case _CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS:
28f367c4	162	#ifdef __ILP32_OFFBIG_LDFLAGS
4a6aca7b	163	# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFFBIG)
9e68d85a	164	# error "__ILP32_OFFBIG_LDFLAGS should not be defined"
4a6aca7b	165	# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFFBIG)
26b62243	166	if (__sysconf (_SC_V7_ILP32_OFFBIG) < 0)
f095bb72	167	break;
28f367c4 UD	168	# endif
	169	string = __ILP32_OFFBIG_LDFLAGS;
	170	string_len = sizeof (__ILP32_OFFBIG_LDFLAGS);
	171	#endif
	172	break;
	173
	174	case _CS_XBS5_LP64_OFF64_LDFLAGS:
	175	case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:
26b62243	176	case _CS_POSIX_V7_LP64_OFF64_LDFLAGS:
28f367c4	177	#ifdef __LP64_OFF64_LDFLAGS
4a6aca7b	178	# if CONF_IS_DEFINED_UNSET (_POSIX_V7_LP64_OFF64)
9e68d85a	179	# error "__LP64_OFF64_LDFLAGS should not be defined"
4a6aca7b	180	# elif CONF_IS_UNDEFINED (_POSIX_V7_LP64_OFF64)
26b62243	181	if (__sysconf (_SC_V7_LP64_OFF64) < 0)
f095bb72	182	break;
28f367c4 UD	183	# endif
	184	string = __LP64_OFF64_LDFLAGS;
	185	string_len = sizeof (__LP64_OFF64_LDFLAGS);
	186	#endif
	187	break;
	188
2c179ef0	189	case _CS_LFS_CFLAGS:
55ed5821	190	case _CS_LFS_LINTFLAGS:
4a6aca7b SP	191	#if (CONF_IS_DEFINED_SET (_POSIX_V6_ILP32_OFF32) \
4a6aca7b SP	192	&& CONF_IS_DEFINED_SET (_POSIX_V6_ILP32_OFFBIG))
28f367c4	193	# define __LFS_CFLAGS "-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
2c179ef0	194	/* Signal that we want the new ABI. */
28f367c4 UD	195	string = __LFS_CFLAGS;
28f367c4 UD	196	string_len = sizeof (__LFS_CFLAGS);
2c179ef0	197	#endif
28f367c4	198	break;
2c179ef0	199
dfd2257a UD	200	case _CS_LFS_LDFLAGS:
dfd2257a UD	201	case _CS_LFS_LIBS:
55ed5821 UD	202	/* No special libraries or linker flags needed. */
	203	break;
	204
dfd2257a UD	205	case _CS_LFS64_CFLAGS:
dfd2257a UD	206	case _CS_LFS64_LINTFLAGS:
28f367c4 UD	207	#define __LFS64_CFLAGS "-D_LARGEFILE64_SOURCE"
	208	string = __LFS64_CFLAGS;
	209	string_len = sizeof (__LFS64_CFLAGS);
55ed5821 UD	210	break;
55ed5821 UD	211
dfd2257a UD	212	case _CS_LFS64_LDFLAGS:
dfd2257a UD	213	case _CS_LFS64_LIBS:
55ed5821 UD	214	/* No special libraries or linker flags needed. */
55ed5821 UD	215	break;
86187531	216
86187531 UD	217	case _CS_XBS5_ILP32_OFF32_LIBS:
86187531 UD	218	case _CS_XBS5_ILP32_OFF32_LINTFLAGS:
86187531 UD	219	case _CS_XBS5_ILP32_OFFBIG_LIBS:
86187531 UD	220	case _CS_XBS5_ILP32_OFFBIG_LINTFLAGS:
86187531 UD	221	case _CS_XBS5_LP64_OFF64_LIBS:
	222	case _CS_XBS5_LP64_OFF64_LINTFLAGS:
	223	case _CS_XBS5_LPBIG_OFFBIG_CFLAGS:
	224	case _CS_XBS5_LPBIG_OFFBIG_LDFLAGS:
	225	case _CS_XBS5_LPBIG_OFFBIG_LIBS:
	226	case _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS:
d20f21a2	227
d20f21a2 UD	228	case _CS_POSIX_V6_ILP32_OFF32_LIBS:
d20f21a2 UD	229	case _CS_POSIX_V6_ILP32_OFF32_LINTFLAGS:
d20f21a2 UD	230	case _CS_POSIX_V6_ILP32_OFFBIG_LIBS:
d20f21a2 UD	231	case _CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS:
d20f21a2 UD	232	case _CS_POSIX_V6_LP64_OFF64_LIBS:
	233	case _CS_POSIX_V6_LP64_OFF64_LINTFLAGS:
	234	case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS:
	235	case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS:
	236	case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS:
	237	case _CS_POSIX_V6_LPBIG_OFFBIG_LINTFLAGS:
26b62243 UD	238
	239	case _CS_POSIX_V7_ILP32_OFF32_LIBS:
	240	case _CS_POSIX_V7_ILP32_OFF32_LINTFLAGS:
	241	case _CS_POSIX_V7_ILP32_OFFBIG_LIBS:
	242	case _CS_POSIX_V7_ILP32_OFFBIG_LINTFLAGS:
	243	case _CS_POSIX_V7_LP64_OFF64_LIBS:
	244	case _CS_POSIX_V7_LP64_OFF64_LINTFLAGS:
	245	case _CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS:
	246	case _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS:
	247	case _CS_POSIX_V7_LPBIG_OFFBIG_LIBS:
	248	case _CS_POSIX_V7_LPBIG_OFFBIG_LINTFLAGS:
af6f3906	249	/* GNU libc does not require special actions to use LFS functions. */
dfd2257a UD	250	break;
dfd2257a UD	251
2067577c UD	252	case _CS_GNU_LIBC_VERSION:
2067577c UD	253	string = "glibc " VERSION;
5461545a RM	254	string_len = sizeof ("glibc " VERSION);
5461545a RM	255	break;
2067577c UD	256
	257	case _CS_GNU_LIBPTHREAD_VERSION:
	258	#ifdef LIBPTHREAD_VERSION
	259	string = LIBPTHREAD_VERSION;
5461545a	260	string_len = sizeof LIBPTHREAD_VERSION;
2067577c UD	261	break;
	262	#else
	263	/* No thread library. */
	264	__set_errno (EINVAL);
	265	return 0;
	266	#endif
	267
f095bb72 UD	268	case _CS_V6_ENV:
	269	case _CS_V7_ENV:
	270	/* Maybe something else is needed in future. */
	271	string = "POSIXLY_CORRECT=1";
	272	string_len = sizeof ("POSIXLY_CORRECT=1");
	273	break;
	274
28f540f4	275	default:
c4029823	276	__set_errno (EINVAL);
28f540f4 RM	277	return 0;
	278	}
	279
04ea3b0f UD	280	if (len > 0 && buf != NULL)
	281	{
	282	if (string_len <= len)
	283	memcpy (buf, string, string_len);
	284	else
	285	{
	286	memcpy (buf, string, len - 1);
	287	buf[len - 1] = '\0';
	288	}
	289	}
28f540f4 RM	290	return string_len;
28f540f4 RM	291	}
c41f555e	292	libc_hidden_def (confstr)