release/src/router/busybox/coreutils/mknod.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * mknod implementation for busybox
   4  *
   5  * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
   6  *
   7  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8  */
   9
  10 /* BB_AUDIT SUSv3 N/A -- Matches GNU behavior. */
  11
  12 #include <sys/sysmacros.h>  // For makedev
  13
  14 #include "libbb.h"
  15 #include "libcoreutils/coreutils.h"
  16
  17 /* This is a NOEXEC applet. Be very careful! */
  18
  19 static const char modes_chars[] ALIGN1 = { 'p', 'c', 'u', 'b', 0, 1, 1, 2 };
  20 static const mode_t modes_cubp[] = { S_IFIFO, S_IFCHR, S_IFBLK };
  21
  22 int mknod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  23 int mknod_main(int argc, char **argv)
  24 {
  25         mode_t mode;
  26         dev_t dev;
  27         const char *name;
  28
  29         mode = getopt_mk_fifo_nod(argv);
  30         argv += optind;
  31         argc -= optind;
  32
  33         if (argc >= 2) {
  34                 name = strchr(modes_chars, argv[1][0]);
  35                 if (name != NULL) {
  36                         mode |= modes_cubp[(int)(name[4])];
  37
  38                         dev = 0;
  39                         if (*name != 'p') {
  40                                 argc -= 2;
  41                                 if (argc == 2) {
  42                                         /* Autodetect what the system supports; these macros should
  43                                          * optimize out to two constants. */
  44                                         dev = makedev(xatoul_range(argv[2], 0, major(UINT_MAX)),
  45                                                       xatoul_range(argv[3], 0, minor(UINT_MAX)));
  46                                 }
  47                         }
  48
  49                         if (argc == 2) {
  50                                 name = *argv;
  51                                 if (mknod(name, mode, dev) == 0) {
  52                                         return EXIT_SUCCESS;
  53                                 }
  54                                 bb_simple_perror_msg_and_die(name);
  55                         }
  56                 }
  57         }
  58         bb_show_usage();
  59 }