| 1 | /* Work around a bug of lstat on some systems
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| 2 |
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| 3 | Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free
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| 4 | Software Foundation, Inc.
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| 5 |
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| 6 | This program is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 2, or (at your option)
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| 9 | any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program; if not, write to the Free Software Foundation,
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| 18 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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| 19 |
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| 20 | /* written by Jim Meyering */
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| 21 |
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| 22 | #include <config.h>
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| 23 |
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| 24 | /* The specification of these functions is in sys_stat.h. But we cannot
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| 25 | include this include file here, because on some systems, a
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| 26 | "#define lstat lstat64" is being used, and sys_stat.h deletes this
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| 27 | definition. */
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| 28 |
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| 29 | #include <sys/types.h>
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| 30 | #include <sys/stat.h>
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| 31 | #include <string.h>
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| 32 | #include <errno.h>
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| 33 |
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| 34 | /* lstat works differently on Linux and Solaris systems. POSIX (see
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| 35 | `pathname resolution' in the glossary) requires that programs like
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| 36 | `ls' take into consideration the fact that FILE has a trailing slash
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| 37 | when FILE is a symbolic link. On Linux and Solaris 10 systems, the
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| 38 | lstat function already has the desired semantics (in treating
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| 39 | `lstat ("symlink/", sbuf)' just like `lstat ("symlink/.", sbuf)',
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| 40 | but on Solaris 9 and earlier it does not.
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| 41 |
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| 42 | If FILE has a trailing slash and specifies a symbolic link,
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| 43 | then use stat() to get more info on the referent of FILE.
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| 44 | If the referent is a non-directory, then set errno to ENOTDIR
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| 45 | and return -1. Otherwise, return stat's result. */
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| 46 |
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| 47 | int
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| 48 | rpl_lstat (const char *file, struct stat *sbuf)
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| 49 | {
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| 50 | size_t len;
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| 51 | int lstat_result = lstat (file, sbuf);
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| 52 |
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| 53 | if (lstat_result != 0 || !S_ISLNK (sbuf->st_mode))
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| 54 | return lstat_result;
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| 55 |
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| 56 | len = strlen (file);
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| 57 | if (len == 0 || file[len - 1] != '/')
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| 58 | return 0;
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| 59 |
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| 60 | /* FILE refers to a symbolic link and the name ends with a slash.
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| 61 | Call stat() to get info about the link's referent. */
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| 62 |
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| 63 | /* If stat fails, then we do the same. */
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| 64 | if (stat (file, sbuf) != 0)
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| 65 | return -1;
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| 66 |
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| 67 | /* If FILE references a directory, return 0. */
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| 68 | if (S_ISDIR (sbuf->st_mode))
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| 69 | return 0;
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| 70 |
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| 71 | /* Here, we know stat succeeded and FILE references a non-directory.
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| 72 | But it was specified via a name including a trailing slash.
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| 73 | Fail with errno set to ENOTDIR to indicate the contradiction. */
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| 74 | errno = ENOTDIR;
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| 75 | return -1;
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| 76 | }
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