Initial revision

1 files changed, 268 insertions, 0 deletions

diff --git a/src/chmod.c b/src/chmod.c
new file mode 100644
index 000000000..1d44c38f7
--- /dev/null
+++ b/src/chmod.c
@@ -0,0 +1,268 @@
+/* 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"
+
+int lstat ();
+
+char *savedir ();
+char *xmalloc ();
+char *xrealloc ();
+int change_file_mode ();
+int change_dir_mode ();
+void describe_change ();
+void error ();
+void mode_string ();
+void usage ();
+
+/* The name the program was run with. */
+char *program_name;
+
+/* If nonzero, change the modes of directories recursively. */
+int recurse;
+
+/* If nonzero, force silence (no error messages). */
+int force_silent;
+
+/* If nonzero, describe the modes we set. */
+int verbose;
+
+/* If nonzero, describe only modes that change. */
+int changes_only;
+
+/* 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 (argc, argv, "RcfvrwxXstugoa,+-=");
+      if (c == EOF)
+	break;
+
+      switch (c)
+	{
+	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 (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. */
+
+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. */
+
+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. */
+
+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]);
+}
+
+void
+usage ()
+{
+  fprintf (stderr, "\
+Usage: %s [-Rcfv] mode file...\n\
+       mode is [ugoa...][[+-=][rwxXstugo...]...][,...] or octal number\n",
+	   program_name);
+  exit (1);
+}