| /* Work around a bug of lstat on some systems | |
| Copyright (C) 1997-2006, 2008-2023 Free Software Foundation, Inc. | |
| This file 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. | |
| This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */ | |
| /* written by Jim Meyering */ | |
| /* If the user's config.h happens to include <sys/stat.h>, let it include only | |
| the system's <sys/stat.h> here, so that orig_lstat doesn't recurse to | |
| rpl_lstat. */ | |
| /* On systems that lack symlinks, our replacement <sys/stat.h> already | |
| defined lstat as stat, so there is nothing further to do other than | |
| avoid an empty file. */ | |
| typedef int dummy; | |
| /* Get the original definition of lstat. It might be defined as a macro. */ | |
| static int | |
| orig_lstat (const char *filename, struct stat *buf) | |
| { | |
| return lstat (filename, buf); | |
| } | |
| /* Specification. */ | |
| /* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc | |
| eliminates this include because of the preliminary #include <sys/stat.h> | |
| above. */ | |
| /* lstat works differently on Linux and Solaris systems. POSIX (see | |
| "pathname resolution" in the glossary) requires that programs like | |
| 'ls' take into consideration the fact that FILE has a trailing slash | |
| when FILE is a symbolic link. On Linux and Solaris 10 systems, the | |
| lstat function already has the desired semantics (in treating | |
| 'lstat ("symlink/", sbuf)' just like 'lstat ("symlink/.", sbuf)', | |
| but on Solaris 9 and earlier it does not. | |
| If FILE has a trailing slash and specifies a symbolic link, | |
| then use stat() to get more info on the referent of FILE. | |
| If the referent is a non-directory, then set errno to ENOTDIR | |
| and return -1. Otherwise, return stat's result. */ | |
| int | |
| rpl_lstat (const char *file, struct stat *sbuf) | |
| { | |
| int result = orig_lstat (file, sbuf); | |
| /* This replacement file can blindly check against '/' rather than | |
| using the ISSLASH macro, because all platforms with '\\' either | |
| lack symlinks (mingw) or have working lstat (cygwin) and thus do | |
| not compile this file. 0 len should have already been filtered | |
| out above, with a failure return of ENOENT. */ | |
| if (result == 0) | |
| { | |
| if (S_ISDIR (sbuf->st_mode) || file[strlen (file) - 1] != '/') | |
| result = stat_time_normalize (result, sbuf); | |
| else | |
| { | |
| /* At this point, a trailing slash is permitted only on | |
| symlink-to-dir; but it should have found information on the | |
| directory, not the symlink. Call 'stat' to get info about the | |
| link's referent. Our replacement stat guarantees valid results, | |
| even if the symlink is not pointing to a directory. */ | |
| if (!S_ISLNK (sbuf->st_mode)) | |
| { | |
| errno = ENOTDIR; | |
| return -1; | |
| } | |
| result = stat (file, sbuf); | |
| } | |
| } | |
| return result; | |
| } | |