Mike Dodd | 8cfa702 | 2010-11-17 11:12:26 -0800 | [diff] [blame] | 1 | /** |
| 2 | * @file file_manip.cpp |
| 3 | * Useful file management helpers |
| 4 | * |
| 5 | * @remark Copyright 2002 OProfile authors |
| 6 | * @remark Read the file COPYING |
| 7 | * |
| 8 | * @author Philippe Elie |
| 9 | * @author John Levon |
| 10 | */ |
| 11 | |
| 12 | #include <unistd.h> |
| 13 | #include <sys/stat.h> |
| 14 | #include <fcntl.h> |
| 15 | #include <utime.h> |
| 16 | #include <limits.h> |
| 17 | #include <stdlib.h> |
| 18 | |
| 19 | #include <cstdio> |
| 20 | #include <cerrno> |
| 21 | #include <iostream> |
| 22 | #include <fstream> |
| 23 | #include <vector> |
| 24 | |
| 25 | #include "op_file.h" |
| 26 | |
| 27 | #include "file_manip.h" |
| 28 | #include "string_manip.h" |
| 29 | |
| 30 | using namespace std; |
| 31 | |
| 32 | |
| 33 | bool copy_file(string const & source, string const & destination) |
| 34 | { |
| 35 | int retval; |
| 36 | struct stat buf; |
| 37 | if (stat(source.c_str(), &buf)) |
| 38 | return false; |
| 39 | |
| 40 | if (!op_file_readable(source)) |
| 41 | return false; |
| 42 | |
| 43 | ifstream in(source.c_str()); |
| 44 | if (!in) |
| 45 | return false; |
| 46 | |
| 47 | mode_t mode = buf.st_mode & ~S_IFMT; |
| 48 | if (!(mode & S_IWUSR)) |
| 49 | mode |= S_IWUSR; |
| 50 | |
| 51 | int fd = open(destination.c_str(), O_RDWR|O_CREAT, mode); |
| 52 | if (fd < 0) |
| 53 | return false; |
| 54 | close(fd); |
| 55 | |
| 56 | |
| 57 | // ignore error here: a simple user can copy a root.root 744 file |
| 58 | // but can't chown the copied file to root. |
| 59 | retval = chown(destination.c_str(), buf.st_uid, buf.st_gid); |
| 60 | |
| 61 | // a scope to ensure out is closed before changing is mtime/atime |
| 62 | { |
| 63 | ofstream out(destination.c_str(), ios::trunc); |
| 64 | if (!out) |
| 65 | return false; |
| 66 | out << in.rdbuf(); |
| 67 | } |
| 68 | |
| 69 | struct utimbuf utim; |
| 70 | utim.actime = buf.st_atime; |
| 71 | utim.modtime = buf.st_mtime; |
| 72 | if (utime(destination.c_str(), &utim)) |
| 73 | return false; |
| 74 | |
| 75 | return true; |
| 76 | } |
| 77 | |
| 78 | |
| 79 | bool is_directory(string const & dirname) |
| 80 | { |
| 81 | struct stat st; |
| 82 | return !stat(dirname.c_str(), &st) && S_ISDIR(st.st_mode); |
| 83 | } |
| 84 | |
| 85 | |
| 86 | bool is_files_identical(string const & file1, string const & file2) |
| 87 | { |
| 88 | struct stat st1; |
| 89 | struct stat st2; |
| 90 | |
| 91 | if (stat(file1.c_str(), &st1) == 0 && stat(file2.c_str(), &st2) == 0) { |
| 92 | if (st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino) |
| 93 | return true; |
| 94 | } |
| 95 | |
| 96 | return false; |
| 97 | } |
| 98 | |
| 99 | |
| 100 | string const op_realpath(string const & name) |
| 101 | { |
| 102 | static char tmp[PATH_MAX]; |
| 103 | if (!realpath(name.c_str(), tmp)) |
| 104 | return name; |
| 105 | return string(tmp); |
| 106 | } |
| 107 | |
| 108 | |
| 109 | bool op_file_readable(string const & file) |
| 110 | { |
| 111 | return op_file_readable(file.c_str()); |
| 112 | } |
| 113 | |
| 114 | static void get_pathname(const char * pathname, void * name_list) |
| 115 | { |
| 116 | list<string> * file_list = (list<string> *)name_list; |
| 117 | file_list->push_back(pathname); |
| 118 | } |
| 119 | |
| 120 | bool create_file_list(list<string> & file_list, string const & base_dir, |
| 121 | string const & filter, bool recursive) |
| 122 | { |
| 123 | return !get_matching_pathnames(&file_list, get_pathname, |
| 124 | base_dir.c_str(), filter.c_str(), |
| 125 | recursive ? MATCH_ANY_ENTRY_RECURSION : |
| 126 | NO_RECURSION) ? true : false; |
| 127 | |
| 128 | } |
| 129 | |
| 130 | |
| 131 | /** |
| 132 | * @param path_name the path where we remove trailing '/' |
| 133 | * |
| 134 | * erase all trailing '/' in path_name except if the last '/' is at pos 0 |
| 135 | */ |
| 136 | static string erase_trailing_path_separator(string const & path_name) |
| 137 | { |
| 138 | string result(path_name); |
| 139 | |
| 140 | while (result.length() > 1) { |
| 141 | if (result[result.length() - 1] != '/') |
| 142 | break; |
| 143 | result.erase(result.length() - 1, 1); |
| 144 | } |
| 145 | |
| 146 | return result; |
| 147 | } |
| 148 | |
| 149 | string op_dirname(string const & file_name) |
| 150 | { |
| 151 | string result = erase_trailing_path_separator(file_name); |
| 152 | if (result.find_first_of('/') == string::npos) |
| 153 | return "."; |
| 154 | |
| 155 | // catch result == "/" |
| 156 | if (result.length() == 1) |
| 157 | return result; |
| 158 | |
| 159 | size_t pos = result.find_last_of('/'); |
| 160 | |
| 161 | // "/usr" must return "/" |
| 162 | if (pos == 0) |
| 163 | pos = 1; |
| 164 | |
| 165 | result.erase(pos, result.length() - pos); |
| 166 | |
| 167 | // "////usr" must return "/" |
| 168 | return erase_trailing_path_separator(result); |
| 169 | } |
| 170 | |
| 171 | |
| 172 | string op_basename(string const & path_name) |
| 173 | { |
| 174 | string result = erase_trailing_path_separator(path_name); |
| 175 | |
| 176 | // catch result == "/" |
| 177 | if (result.length() == 1) |
| 178 | return result; |
| 179 | |
| 180 | return erase_to_last_of(result, '/'); |
| 181 | } |