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- /* chmod -- change permission modes of files
- Copyright (C) 1989, 1990, 1991 Free Software Foundation, Inc.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- This program 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 General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* Options:
- -R Recursively change modes of directory contents.
- -c Verbosely describe only files whose modes actually change.
- -f Do not print error messages about files.
- -v Verbosely describe changed modes.
-
- David MacKenzie <djm@gnu.ai.mit.edu> */
-
- #include <stdio.h>
- #include <getopt.h>
- #include <sys/types.h>
- #include "modechange.h"
- #include "system.h"
- #include "version.h"
-
- int lstat ();
-
- char *savedir ();
- char *xmalloc ();
- char *xrealloc ();
- void error ();
- void mode_string ();
-
- static int change_file_mode ();
- static int change_dir_mode ();
- static void describe_change ();
- static void usage ();
-
- /* The name the program was run with. */
- char *program_name;
-
- /* If nonzero, change the modes of directories recursively. */
- static int recurse;
-
- /* If nonzero, force silence (no error messages). */
- static int force_silent;
-
- /* If nonzero, describe the modes we set. */
- static int verbose;
-
- /* If nonzero, describe only modes that change. */
- static int changes_only;
-
- /* If non-zero, display usage information and exit. */
- static int flag_help;
-
- /* If non-zero, print the version on standard error. */
- static int flag_version;
-
- static struct option const long_options[] =
- {
- {"recursive", no_argument, 0, 'R'},
- {"changes", no_argument, 0, 'c'},
- {"silent", no_argument, 0, 'f'},
- {"quiet", no_argument, 0, 'f'},
- {"verbose", no_argument, 0, 'v'},
- {"help", no_argument, &flag_help, 1},
- {"version", no_argument, &flag_version, 1},
- {0, 0, 0, 0}
- };
-
- /* Parse the ASCII mode given on the command line into a linked list
- of `struct mode_change' and apply that to each file argument. */
-
- void
- main (argc, argv)
- int argc;
- char **argv;
- {
- struct mode_change *changes;
- int errors = 0;
- int modeind = 0; /* Index of the mode argument in `argv'. */
- int thisind;
- int c;
-
- program_name = argv[0];
- recurse = force_silent = verbose = changes_only = 0;
-
- while (1)
- {
- thisind = optind ? optind : 1;
-
- c = getopt_long (argc, argv, "RcfvrwxXstugoa,+-=", long_options,
- (int *) 0);
- if (c == EOF)
- break;
-
- switch (c)
- {
- case 0:
- break;
- case 'r':
- case 'w':
- case 'x':
- case 'X':
- case 's':
- case 't':
- case 'u':
- case 'g':
- case 'o':
- case 'a':
- case ',':
- case '+':
- case '-':
- case '=':
- if (modeind != 0 && modeind != thisind)
- error (1, 0, "invalid mode");
- modeind = thisind;
- break;
- case 'R':
- recurse = 1;
- break;
- case 'c':
- verbose = 1;
- changes_only = 1;
- break;
- case 'f':
- force_silent = 1;
- break;
- case 'v':
- verbose = 1;
- break;
- default:
- usage ();
- }
- }
-
- if (flag_version)
- {
- fprintf (stderr, "%s\n", version_string);
- exit (0);
- }
-
- if (flag_help)
- usage ();
-
- if (modeind == 0)
- modeind = optind++;
-
- if (optind >= argc)
- usage ();
-
- changes = mode_compile (argv[modeind],
- MODE_MASK_EQUALS | MODE_MASK_PLUS | MODE_MASK_MINUS);
- if (changes == MODE_INVALID)
- error (1, 0, "invalid mode");
- else if (changes == MODE_MEMORY_EXHAUSTED)
- error (1, 0, "virtual memory exhausted");
-
- for (; optind < argc; ++optind)
- errors |= change_file_mode (argv[optind], changes);
-
- exit (errors);
- }
-
- /* Change the mode of FILE according to the list of operations CHANGES.
- Return 0 if successful, 1 if errors occurred. */
-
- static int
- change_file_mode (file, changes)
- char *file;
- struct mode_change *changes;
- {
- struct stat file_stats;
- unsigned short newmode;
- int errors = 0;
-
- if (lstat (file, &file_stats))
- {
- if (force_silent == 0)
- error (0, errno, "%s", file);
- return 1;
- }
- #ifdef S_ISLNK
- if (S_ISLNK (file_stats.st_mode))
- return 0;
- #endif
-
- newmode = mode_adjust (file_stats.st_mode, changes);
-
- if (newmode != (file_stats.st_mode & 07777))
- {
- if (verbose)
- describe_change (file, newmode, 1);
- if (chmod (file, (int) newmode))
- {
- if (force_silent == 0)
- error (0, errno, "%s", file);
- errors = 1;
- }
- }
- else if (verbose && changes_only == 0)
- describe_change (file, newmode, 0);
-
- if (recurse && S_ISDIR (file_stats.st_mode))
- errors |= change_dir_mode (file, changes, &file_stats);
- return errors;
- }
-
- /* Recursively change the modes of the files in directory DIR
- according to the list of operations CHANGES.
- STATP points to the results of lstat on DIR.
- Return 0 if successful, 1 if errors occurred. */
-
- static int
- change_dir_mode (dir, changes, statp)
- char *dir;
- struct mode_change *changes;
- struct stat *statp;
- {
- char *name_space, *namep;
- char *path; /* Full path of each entry to process. */
- unsigned dirlength; /* Length of DIR and '\0'. */
- unsigned filelength; /* Length of each pathname to process. */
- unsigned pathlength; /* Bytes allocated for `path'. */
- int errors = 0;
-
- errno = 0;
- name_space = savedir (dir, statp->st_size);
- if (name_space == NULL)
- {
- if (errno)
- {
- if (force_silent == 0)
- error (0, errno, "%s", dir);
- return 1;
- }
- else
- error (1, 0, "virtual memory exhausted");
- }
-
- dirlength = strlen (dir) + 1; /* + 1 is for the trailing '/'. */
- pathlength = dirlength + 1;
- /* Give `path' a dummy value; it will be reallocated before first use. */
- path = xmalloc (pathlength);
- strcpy (path, dir);
- path[dirlength - 1] = '/';
-
- for (namep = name_space; *namep; namep += filelength - dirlength)
- {
- filelength = dirlength + strlen (namep) + 1;
- if (filelength > pathlength)
- {
- pathlength = filelength * 2;
- path = xrealloc (path, pathlength);
- }
- strcpy (path + dirlength, namep);
- errors |= change_file_mode (path, changes);
- }
- free (path);
- free (name_space);
- return errors;
- }
-
- /* Tell the user the mode MODE that file FILE has been set to;
- if CHANGED is zero, FILE had that mode already. */
-
- static void
- describe_change (file, mode, changed)
- char *file;
- unsigned short mode;
- int changed;
- {
- char perms[11]; /* "-rwxrwxrwx" ls-style modes. */
-
- mode_string (mode, perms);
- perms[10] = '\0'; /* `mode_string' does not null terminate. */
- if (changed)
- printf ("mode of %s changed to %04o (%s)\n",
- file, mode & 07777, &perms[1]);
- else
- printf ("mode of %s retained as %04o (%s)\n",
- file, mode & 07777, &perms[1]);
- }
-
- static void
- usage ()
- {
- fprintf (stderr, "\
- Usage: %s [-Rcfv] [--recursive] [--changes] [--silent] [--quiet]\n\
- [--verbose] [--help] [--version] mode file...\n\
- mode is [ugoa...][[+-=][rwxXstugo...]...][,...] or octal number\n",
- program_name);
- exit (1);
- }
-