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glibc/posix/confstr.c

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/* Copyright (C) 1991, 1996, 1997, 2000-2002, 2003, 2004
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. */
#include <stddef.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <confstr.h>
#include "../version.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;
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. */
{
char restenvs[4 * sizeof "POSIX_V6_LPBIG_OFFBIG"];
string_len = 0;
#ifndef _POSIX_V6_ILP32_OFF32
if (__sysconf (_SC_V6_ILP32_OFF32) > 0)
#endif
#if !defined _POSIX_V6_ILP32_OFF32 || _POSIX_V6_ILP32_OFF32 > 0
{
memcpy (restenvs + string_len, "POSIX_V6_ILP32_OFF32",
sizeof "POSIX_V6_ILP32_OFF32" - 1);
string_len += sizeof "POSIX_V6_ILP32_OFF32" - 1;
}
#endif
#ifndef _POSIX_V6_ILP32_OFFBIG
if (__sysconf (_SC_V6_ILP32_OFFBIG) > 0)
#endif
#if !defined _POSIX_V6_ILP32_OFFBIG || _POSIX_V6_ILP32_OFFBIG > 0
{
if (string_len)
restenvs[string_len++] = '\n';
memcpy (restenvs + string_len, "POSIX_V6_ILP32_OFFBIG",
sizeof "POSIX_V6_ILP32_OFFBIG" - 1);
string_len += sizeof "POSIX_V6_ILP32_OFFBIG" - 1;
}
#endif
#ifndef _POSIX_V6_LP64_OFF64
if (__sysconf (_SC_V6_LP64_OFF64) > 0)
#endif
#if !defined _POSIX_V6_LP64_OFF64 || _POSIX_V6_LP64_OFF64 > 0
{
if (string_len)
restenvs[string_len++] = '\n';
memcpy (restenvs + string_len, "POSIX_V6_LP64_OFF64",
sizeof "POSIX_V6_LP64_OFF64" - 1);
string_len += sizeof "POSIX_V6_LP64_OFF64" - 1;
}
#endif
#ifndef _POSIX_V6_LPBIG_OFFBIG
if (__sysconf (_SC_V6_LPBIG_OFFBIG) > 0)
#endif
#if !defined _POSIX_V6_LPBIG_OFFBIG || _POSIX_V6_LPBIG_OFFBIG > 0
{
if (string_len)
restenvs[string_len++] = '\n';
memcpy (restenvs + string_len, "POSIX_V6_LPBIG_OFFBIG",
sizeof "POSIX_V6_LPBIG_OFFBIG" - 1);
string_len += sizeof "POSIX_V6_LPBIG_OFFBIG" - 1;
}
#endif
restenvs[string_len++] = '\0';
string = restenvs;
}
break;
case _CS_XBS5_ILP32_OFF32_CFLAGS:
case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:
#ifdef __ILP32_OFF32_CFLAGS
# if _POSIX_V6_ILP32_OFF32 == -1
# error "__ILP32_OFF32_CFLAGS should not be defined"
# elif !defined _POSIX_V6_ILP32_OFF32
if (__sysconf (_SC_V6_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:
#ifdef __ILP32_OFFBIG_CFLAGS
# if _POSIX_V6_ILP32_OFFBIG == -1
# error "__ILP32_OFFBIG_CFLAGS should not be defined"
# elif !defined _POSIX_V6_ILP32_OFFBIG
if (__sysconf (_SC_V6_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:
#ifdef __LP64_OFF64_CFLAGS
# if _POSIX_V6_LP64_OFF64 == -1
# error "__LP64_OFF64_CFLAGS should not be defined"
# elif !defined _POSIX_V6_LP64_OFF64
if (__sysconf (_SC_V6_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:
#ifdef __ILP32_OFF32_LDFLAGS
# if _POSIX_V6_ILP32_OFF32 == -1
# error "__ILP32_OFF32_LDFLAGS should not be defined"
# elif !defined _POSIX_V6_ILP32_OFF32
if (__sysconf (_SC_V6_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:
#ifdef __ILP32_OFFBIG_LDFLAGS
# if _POSIX_V6_ILP32_OFFBIG == -1
# error "__ILP32_OFFBIG_LDFLAGS should not be defined"
# elif !defined _POSIX_V6_ILP32_OFFBIG
if (__sysconf (_SC_V6_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:
#ifdef __LP64_OFF64_LDFLAGS
# if _POSIX_V6_LP64_OFF64 == -1
# error "__LP64_OFF64_LDFLAGS should not be defined"
# elif !defined _POSIX_V6_LP64_OFF64
if (__sysconf (_SC_V6_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 _POSIX_V6_ILP32_OFF32 == 1 && _POSIX_V6_ILP32_OFFBIG == 1
# 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:
/* 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
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)
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