1/* Work around a bug of lstat on some systems 2 3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free 4 Software Foundation, Inc. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software Foundation, 18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ 19#include <sys/cdefs.h> 20__RCSID("$NetBSD: lstat.c,v 1.2 2016/05/17 14:00:09 christos Exp $"); 21 22 23/* written by Jim Meyering */ 24 25#ifdef HAVE_CONFIG_H 26# include <config.h> 27#endif 28 29/* The specification of these functions is in sys_stat.h. But we cannot 30 include this include file here, because on some systems, a 31 "#define lstat lstat64" is being used, and sys_stat.h deletes this 32 definition. */ 33 34#include <sys/types.h> 35#include <sys/stat.h> 36#include <stdlib.h> 37#include <string.h> 38 39#include "stat-macros.h" 40#include "xalloc.h" 41 42/* lstat works differently on Linux and Solaris systems. POSIX (see 43 `pathname resolution' in the glossary) requires that programs like `ls' 44 take into consideration the fact that FILE has a trailing slash when 45 FILE is a symbolic link. On Linux systems, the lstat function already 46 has the desired semantics (in treating `lstat("symlink/",sbuf)' just like 47 `lstat("symlink/.",sbuf)', but on Solaris it does not. 48 49 If FILE has a trailing slash and specifies a symbolic link, 50 then append a `.' to FILE and call lstat a second time. */ 51 52int 53rpl_lstat (const char *file, struct stat *sbuf) 54{ 55 size_t len; 56 char *new_file; 57 58 int lstat_result = lstat (file, sbuf); 59 60 if (lstat_result != 0 || !S_ISLNK (sbuf->st_mode)) 61 return lstat_result; 62 63 len = strlen (file); 64 if (len == 0 || file[len - 1] != '/') 65 return lstat_result; 66 67 /* FILE refers to a symbolic link and the name ends with a slash. 68 Append a `.' to FILE and repeat the lstat call. */ 69 70 /* Add one for the `.' we'll append, and one more for the trailing NUL. */ 71 new_file = xmalloc (len + 1 + 1); 72 memcpy (new_file, file, len); 73 new_file[len] = '.'; 74 new_file[len + 1] = 0; 75 76 lstat_result = lstat (new_file, sbuf); 77 free (new_file); 78 79 return lstat_result; 80} 81