source: trunk/libs/newlib/src/newlib/libc/sys/linux/confstr.c

Last change on this file was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
File size: 4.6 KB
Line 
1/* Copyright (C) 1991, 1996, 1997, 2000, 2001 Free Software Foundation, Inc.
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
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.
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
12   Lesser General Public License for more details.
13
14   You should have received a copy of the GNU Lesser General Public
15   License along with the GNU C Library; if not, write to the Free
16   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17   02111-1307 USA.  */
18
19#define _GNU_SOURCE 1
20
21#include <stddef.h>
22#include <errno.h>
23#include <unistd.h>
24#include <string.h>
25#include <confstr.h>
26
27/* If BUF is not NULL and LEN > 0, fill in at most LEN - 1 bytes
28   of BUF with the value corresponding to NAME and zero-terminate BUF.
29   Return the number of bytes required to hold NAME's entire value.  */
30size_t
31confstr (name, buf, len)
32     int name;
33     char *buf;
34     size_t len;
35{
36  const char *string;
37  size_t string_len;
38
39  switch (name)
40    {
41    case _CS_PATH:
42      {
43        static const char cs_path[] = CS_PATH;
44        string = cs_path;
45        string_len = sizeof (cs_path);
46      }
47      break;
48
49    case _CS_V6_WIDTH_RESTRICTED_ENVS:
50      /* We have to return a newline-separated list of named of
51         programming environements in which the widths of blksize_t,
52         cc_t, mode_t, nfds_t, pid_t, ptrdiff_t, size_t, speed_t,
53         ssize_t, suseconds_t, tcflag_t, useconds_t, wchar_t, and
54         wint_t types are no greater than the width of type long.
55
56         Currently this means all environment which the system allows.  */
57      {
58        static const char restenvs[] =
59#if _POSIX_V6_ILP32_OFF32 > 0
60        "_POSIX_V6_ILP32_OFF32"
61#endif
62#if _POSIX_V6_ILP32_OFFBIG > 0
63# if _POSIX_V6_ILP32_OFF32 > 0
64        "\n"
65# endif
66        "_POSIX_V6_ILP32_OFFBIG"
67#endif
68#if _POSIX_V6_LP64_OFF64 > 0
69# if _POSIX_V6_ILP32_OFF32 > 0 || _POSIX_V6_ILP32_OFFBIG > 0
70        "\n"
71# endif
72        "_POSIX_V6_LP64_OFF64"
73#endif
74#if _POSIX_V6_LPBIG_OFFBIG > 0
75# if _POSIX_V6_ILP32_OFF32 > 0 || _POSIX_V6_ILP32_OFFBIG > 0 \
76     || _POSIX_V6_LP64_OFF64 > 0
77        "\n"
78# endif
79        "_POSIX_V6_LPBIG_OFFBIG"
80#endif
81          ;
82        string = restenvs;
83        string_len = sizeof (restenvs);
84      }
85      break;
86
87    case _CS_XBS5_ILP32_OFFBIG_CFLAGS:
88    case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS:
89    case _CS_LFS_CFLAGS:
90#if _XBS5_LP64_OFF64 == -1 && _XBS5_LPBIG_OFFBIG == -1 && _XBS5_ILP32_OFFBIG == 1
91      /* Signal that we want the new ABI.  */
92      {
93        static const char file_offset[] = "-D_FILE_OFFSET_BITS=64";
94        string = file_offset;
95        string_len = sizeof (file_offset);
96      }
97      break;
98#endif
99      /* FALLTHROUGH */
100
101    case _CS_LFS_LINTFLAGS:
102    case _CS_LFS_LDFLAGS:
103    case _CS_LFS_LIBS:
104    case _CS_LFS64_CFLAGS:
105    case _CS_LFS64_LINTFLAGS:
106    case _CS_LFS64_LDFLAGS:
107    case _CS_LFS64_LIBS:
108
109    case _CS_XBS5_ILP32_OFF32_CFLAGS:
110    case _CS_XBS5_ILP32_OFF32_LDFLAGS:
111    case _CS_XBS5_ILP32_OFF32_LIBS:
112    case _CS_XBS5_ILP32_OFF32_LINTFLAGS:
113    case _CS_XBS5_ILP32_OFFBIG_LDFLAGS:
114    case _CS_XBS5_ILP32_OFFBIG_LIBS:
115    case _CS_XBS5_ILP32_OFFBIG_LINTFLAGS:
116    case _CS_XBS5_LP64_OFF64_CFLAGS:
117    case _CS_XBS5_LP64_OFF64_LDFLAGS:
118    case _CS_XBS5_LP64_OFF64_LIBS:
119    case _CS_XBS5_LP64_OFF64_LINTFLAGS:
120    case _CS_XBS5_LPBIG_OFFBIG_CFLAGS:
121    case _CS_XBS5_LPBIG_OFFBIG_LDFLAGS:
122    case _CS_XBS5_LPBIG_OFFBIG_LIBS:
123    case _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS:
124
125    case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:
126    case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS:
127    case _CS_POSIX_V6_ILP32_OFF32_LIBS:
128    case _CS_POSIX_V6_ILP32_OFF32_LINTFLAGS:
129    case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:
130    case _CS_POSIX_V6_ILP32_OFFBIG_LIBS:
131    case _CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS:
132    case _CS_POSIX_V6_LP64_OFF64_CFLAGS:
133    case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:
134    case _CS_POSIX_V6_LP64_OFF64_LIBS:
135    case _CS_POSIX_V6_LP64_OFF64_LINTFLAGS:
136    case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS:
137    case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS:
138    case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS:
139    case _CS_POSIX_V6_LPBIG_OFFBIG_LINTFLAGS:
140      /* GNU libc does not require special actions to use LFS functions.  */
141      string = "";
142      string_len = 1;
143      break;
144
145    default:
146      __set_errno (EINVAL);
147      return 0;
148    }
149
150  if (len > 0 && buf != NULL)
151    {
152      if (string_len <= len)
153        memcpy (buf, string, string_len);
154      else
155        {
156          memcpy (buf, string, len - 1);
157          buf[len - 1] = '\0';
158        }
159    }
160  return string_len;
161}
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