1 /* chmod -- change permission modes of files
2 Copyright (C) 89, 90, 91, 95, 1996 Free Software Foundation, Inc.
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 2, or (at your option)
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.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19 -R Recursively change modes of directory contents.
20 -c Verbosely describe only files whose modes actually change.
21 -f Do not print error messages about files.
22 -v Verbosely describe changed modes.
24 David MacKenzie <djm@gnu.ai.mit.edu> */
29 #include <sys/types.h>
31 #include "modechange.h"
37 void strip_trailing_slashes ();
41 static int change_dir_mode __P ((const char *dir,
42 const struct mode_change *changes,
43 const struct stat *statp));
45 /* The name the program was run with. */
48 /* If nonzero, change the modes of directories recursively. */
51 /* If nonzero, force silence (no error messages). */
52 static int force_silent;
54 /* If nonzero, describe the modes we set. */
57 /* If nonzero, describe only modes that change. */
58 static int changes_only;
60 /* If nonzero, display usage information and exit. */
63 /* If nonzero, print the version on standard output and exit. */
64 static int show_version;
66 static struct option const long_options[] =
68 {"recursive", no_argument, 0, 'R'},
69 {"changes", no_argument, 0, 'c'},
70 {"silent", no_argument, 0, 'f'},
71 {"quiet", no_argument, 0, 'f'},
72 {"verbose", no_argument, 0, 'v'},
73 {"help", no_argument, &show_help, 1},
74 {"version", no_argument, &show_version, 1},
78 /* Tell the user the mode MODE that file FILE has been set to;
79 if CHANGED is zero, FILE had that mode already. */
82 describe_change (const char *file, short unsigned int mode, int changed)
84 char perms[11]; /* "-rwxrwxrwx" ls-style modes. */
86 mode_string (mode, perms);
87 perms[10] = '\0'; /* `mode_string' does not null terminate. */
89 printf (_("mode of %s changed to %04o (%s)\n"),
90 file, mode & 07777, &perms[1]);
92 printf (_("mode of %s retained as %04o (%s)\n"),
93 file, mode & 07777, &perms[1]);
96 /* Change the mode of FILE according to the list of operations CHANGES.
97 If DEREF_SYMLINK is nonzero and FILE is a symbolic link, change the
98 mode of the referenced file. If DEREF_SYMLINK is zero, ignore symbolic
99 links. Return 0 if successful, 1 if errors occurred. */
102 change_file_mode (const char *file, const struct mode_change *changes,
103 const int deref_symlink)
105 struct stat file_stats;
106 unsigned short newmode;
109 if (lstat (file, &file_stats))
111 if (force_silent == 0)
112 error (0, errno, "%s", file);
116 if (S_ISLNK (file_stats.st_mode))
121 if (stat (file, &file_stats))
123 if (force_silent == 0)
124 error (0, errno, "%s", file);
130 newmode = mode_adjust (file_stats.st_mode, changes);
132 if (newmode != (file_stats.st_mode & 07777))
135 describe_change (file, newmode, 1);
136 if (chmod (file, (int) newmode))
138 if (force_silent == 0)
139 error (0, errno, "%s", file);
143 else if (verbose && changes_only == 0)
144 describe_change (file, newmode, 0);
146 if (recurse && S_ISDIR (file_stats.st_mode))
147 errors |= change_dir_mode (file, changes, &file_stats);
151 /* Recursively change the modes of the files in directory DIR
152 according to the list of operations CHANGES.
153 STATP points to the results of lstat on DIR.
154 Return 0 if successful, 1 if errors occurred. */
157 change_dir_mode (const char *dir, const struct mode_change *changes,
158 const struct stat *statp)
160 char *name_space, *namep;
161 char *path; /* Full path of each entry to process. */
162 unsigned dirlength; /* Length of DIR and '\0'. */
163 unsigned filelength; /* Length of each pathname to process. */
164 unsigned pathlength; /* Bytes allocated for `path'. */
168 name_space = savedir (dir, statp->st_size);
169 if (name_space == NULL)
173 if (force_silent == 0)
174 error (0, errno, "%s", dir);
178 error (1, 0, _("virtual memory exhausted"));
181 dirlength = strlen (dir) + 1; /* + 1 is for the trailing '/'. */
182 pathlength = dirlength + 1;
183 /* Give `path' a dummy value; it will be reallocated before first use. */
184 path = xmalloc (pathlength);
186 path[dirlength - 1] = '/';
188 for (namep = name_space; *namep; namep += filelength - dirlength)
190 filelength = dirlength + strlen (namep) + 1;
191 if (filelength > pathlength)
193 pathlength = filelength * 2;
194 path = xrealloc (path, pathlength);
196 strcpy (path + dirlength, namep);
197 errors |= change_file_mode (path, changes, 0);
208 fprintf (stderr, _("Try `%s --help' for more information.\n"),
213 Usage: %s [OPTION]... MODE[,MODE]... FILE...\n\
214 or: %s [OPTION]... OCTAL_MODE FILE...\n\
216 program_name, program_name);
219 -c, --changes like verbose but report only when a change is made\n\
220 -f, --silent, --quiet suppress most error messages\n\
221 -v, --verbose output a diagnostic for every file processed\n\
222 -R, --recursive change files and directories recursively\n\
223 --help display this help and exit\n\
224 --version output version information and exit\n\
226 Each MODE is one or more of the letters ugoa, one of the symbols +-= and\n\
227 one or more of the letters rwxXstugo.\n\
229 puts (_("\nReport bugs to bug-gnu-utils@gnu.ai.mit.edu"));
234 /* Parse the ASCII mode given on the command line into a linked list
235 of `struct mode_change' and apply that to each file argument. */
238 main (int argc, char **argv)
240 struct mode_change *changes;
242 int modeind = 0; /* Index of the mode argument in `argv'. */
246 program_name = argv[0];
247 setlocale (LC_ALL, "");
248 bindtextdomain (PACKAGE, LOCALEDIR);
249 textdomain (PACKAGE);
251 recurse = force_silent = verbose = changes_only = 0;
255 thisind = optind ? optind : 1;
257 c = getopt_long (argc, argv, "RcfvrwxXstugoa,+-=", long_options,
280 if (modeind != 0 && modeind != thisind)
281 error (1, 0, _("invalid mode"));
304 printf ("chmod - %s\n", PACKAGE_VERSION);
316 error (0, 0, _("too few arguments"));
320 changes = mode_compile (argv[modeind],
321 MODE_MASK_EQUALS | MODE_MASK_PLUS | MODE_MASK_MINUS);
322 if (changes == MODE_INVALID)
323 error (1, 0, _("invalid mode"));
324 else if (changes == MODE_MEMORY_EXHAUSTED)
325 error (1, 0, _("virtual memory exhausted"));
327 for (; optind < argc; ++optind)
329 strip_trailing_slashes (argv[optind]);
330 errors |= change_file_mode (argv[optind], changes, 1);