1/* Work around platform bugs in stat. 2 Copyright (C) 2009-2011 Free Software Foundation, Inc. 3 4 This program is free software: you can redistribute it and/or modify 5 it under the terms of the GNU General Public License as published by 6 the Free Software Foundation; either version 3 of the License, or 7 (at your option) any later version. 8 9 This program 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 12 GNU General Public License for more details. 13 14 You should have received a copy of the GNU General Public License 15 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 16 17/* written by Eric Blake */ 18 19#include <config.h> 20 21/* Get the original definition of stat. It might be defined as a macro. */ 22#define __need_system_sys_stat_h 23#include <sys/types.h> 24#include <sys/stat.h> 25#undef __need_system_sys_stat_h 26 27static inline int 28orig_stat (const char *filename, struct stat *buf) 29{ 30 return stat (filename, buf); 31} 32 33/* Specification. */ 34#include <sys/stat.h> 35 36#include <errno.h> 37#include <limits.h> 38#include <stdbool.h> 39#include <string.h> 40#include "dosname.h" 41#include "verify.h" 42 43/* Store information about NAME into ST. Work around bugs with 44 trailing slashes. Mingw has other bugs (such as st_ino always 45 being 0 on success) which this wrapper does not work around. But 46 at least this implementation provides the ability to emulate fchdir 47 correctly. */ 48 49int 50rpl_stat (char const *name, struct stat *st) 51{ 52 int result = orig_stat (name, st); 53#if REPLACE_FUNC_STAT_FILE 54 /* Solaris 9 mistakenly succeeds when given a non-directory with a 55 trailing slash. */ 56 if (result == 0 && !S_ISDIR (st->st_mode)) 57 { 58 size_t len = strlen (name); 59 if (ISSLASH (name[len - 1])) 60 { 61 errno = ENOTDIR; 62 return -1; 63 } 64 } 65#endif /* REPLACE_FUNC_STAT_FILE */ 66#if REPLACE_FUNC_STAT_DIR 67 /* The only known systems where REPLACE_FUNC_STAT_DIR is needed also 68 have a constant PATH_MAX. */ 69# ifndef PATH_MAX 70# error "Please port this replacement to your platform" 71# endif 72 73 if (result == -1 && errno == ENOENT) 74 { 75 /* Due to mingw's oddities, there are some directories (like 76 c:\) where stat() only succeeds with a trailing slash, and 77 other directories (like c:\windows) where stat() only 78 succeeds without a trailing slash. But we want the two to be 79 synonymous, since chdir() manages either style. Likewise, Mingw also 80 reports ENOENT for names longer than PATH_MAX, when we want 81 ENAMETOOLONG, and for stat("file/"), when we want ENOTDIR. 82 Fortunately, mingw PATH_MAX is small enough for stack 83 allocation. */ 84 char fixed_name[PATH_MAX + 1] = {0}; 85 size_t len = strlen (name); 86 bool check_dir = false; 87 verify (PATH_MAX <= 4096); 88 if (PATH_MAX <= len) 89 errno = ENAMETOOLONG; 90 else if (len) 91 { 92 strcpy (fixed_name, name); 93 if (ISSLASH (fixed_name[len - 1])) 94 { 95 check_dir = true; 96 while (len && ISSLASH (fixed_name[len - 1])) 97 fixed_name[--len] = '\0'; 98 if (!len) 99 fixed_name[0] = '/'; 100 } 101 else 102 fixed_name[len++] = '/'; 103 result = orig_stat (fixed_name, st); 104 if (result == 0 && check_dir && !S_ISDIR (st->st_mode)) 105 { 106 result = -1; 107 errno = ENOTDIR; 108 } 109 } 110 } 111#endif /* REPLACE_FUNC_STAT_DIR */ 112 return result; 113} 114