fatattr: new applet

function                                             old     new   delta
fatattr_main                                           -     281    +281
packed_usage                                       29821   29871     +50
bit_to_char                                            -      10     +10
applet_names                                        2472    2480      +8
applet_main                                         1436    1440      +4
applet_nameofs                                       718     720      +2
------------------------------------------------------------------------------
(add/remove: 3/0 grow/shrink: 4/0 up/down: 355/0)             Total: 355 bytes

Signed-off-by: Pascal Bellard <pascal.bellard@ads-lu.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/util-linux/fatattr.c b/util-linux/fatattr.c
new file mode 100644 (file)
index 0000000..0f8d632
--- /dev/null
+++ b/util-linux/fatattr.c
@@ -0,0 +1,104 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Display or change file attributes on a fat file system
+ *
+ * Copyright 2005 H. Peter Anvin
+ * Busybox'ed (2014) by Pascal Bellard <pascal.bellard@ads-lu.com>
+ *
+ * This file can be redistributed under the terms of the GNU General
+ * Public License
+ */
+//config:config FATATTR
+//config:      bool "fatattr"
+//config:      default y
+//config:      select PLATFORM_LINUX
+//config:      help
+//config:        fatattr lists or changes the file attributes on a fat file system.
+
+//applet:IF_FATATTR(APPLET(fatattr, BB_DIR_BIN, BB_SUID_DROP))
+//kbuild:lib-$(CONFIG_FATATTR) += fatattr.o
+
+//usage:#define fatattr_trivial_usage
+//usage:       "[-+rhsvda] FILE..."
+//usage:#define fatattr_full_usage "\n\n"
+//usage:       "Change file attributes on FAT filesystem\n"
+//usage:     "\n       -       Clear attributes"
+//usage:     "\n       +       Set attributes"
+//usage:     "\n       r       Read only"
+//usage:     "\n       h       Hidden"
+//usage:     "\n       s       System"
+//usage:     "\n       v       Volume label"
+//usage:     "\n       d       Directory"
+//usage:     "\n       a       Archive"
+
+#include "libbb.h"
+/* linux/msdos_fs.h says: */
+#ifndef FAT_IOCTL_GET_ATTRIBUTES
+# define FAT_IOCTL_GET_ATTRIBUTES        _IOR('r', 0x10, __u32)
+# define FAT_IOCTL_SET_ATTRIBUTES        _IOW('r', 0x11, __u32)
+#endif
+
+/* Currently supports only the FAT flags, not the NTFS ones.
+ * Extra space at the end is a hack to print space separator in file listing.
+ * Let's hope no one ever passes space as an option char :)
+ */
+static const char bit_to_char[] = "rhsvda67 ";
+
+static inline unsigned long get_flag(char c)
+{
+       const char *fp = strchr(bit_to_char, c);
+       if (!fp)
+               bb_error_msg_and_die("invalid character '%c'", c);
+       return 1 << (fp - bit_to_char);
+}
+
+static unsigned decode_arg(const char *arg)
+{
+       unsigned fl = 0;
+       while (*++arg)
+               fl |= get_flag(*arg);
+       return fl;
+}
+
+int fatattr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int fatattr_main(int argc UNUSED_PARAM, char **argv)
+{
+       unsigned set_mask = 0;
+       unsigned clear_mask = 0;
+
+       for (;;) {
+               unsigned fl;
+               char *arg = *++argv;
+
+               if (!arg)
+                       bb_show_usage();
+               if (arg[0] != '-' && arg[0] != '+')
+                       break;
+               fl = decode_arg(arg);
+               if (arg[0] == '+')
+                       set_mask |= fl;
+               else
+                       clear_mask |= fl;
+       }
+
+       do {
+               int fd, i;
+               uint32_t attr;
+
+               fd = xopen(*argv, O_RDONLY);
+               xioctl(fd, FAT_IOCTL_GET_ATTRIBUTES, &attr);
+               attr = (attr | set_mask) & ~clear_mask;
+               if (set_mask | clear_mask)
+                       xioctl(fd, FAT_IOCTL_SET_ATTRIBUTES, &attr);
+               else {
+                       for (i = 0; bit_to_char[i]; i++) {
+                               bb_putchar((attr & 1) ? bit_to_char[i] : ' ');
+                               attr >>= 1;
+                       }
+                       puts(*argv);
+               }
+               close(fd);
+       } while (*++argv);
+
+       return EXIT_SUCCESS;
+}