applets/usage.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Copyright (C) 2008 Denys Vlasenko.
   4  *
   5  * Licensed under GPLv2, see file LICENSE in this source tree.
   6  */
   7 #include <unistd.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10
  11 #include "autoconf.h"
  12
  13 /* Since we can't use platform.h, have to do this again by hand: */
  14 #if ENABLE_NOMMU
  15 # define BB_MMU 0
  16 # define USE_FOR_NOMMU(...) __VA_ARGS__
  17 # define USE_FOR_MMU(...)
  18 #else
  19 # define BB_MMU 1
  20 # define USE_FOR_NOMMU(...)
  21 # define USE_FOR_MMU(...) __VA_ARGS__
  22 #endif
  23
  24 #include "usage.h"
  25 #define MAKE_USAGE(aname, usage) { aname, usage },
  26 static struct usage_data {
  27         const char *aname;
  28         const char *usage;
  29 } usage_array[] = {
  30 #include "applets.h"
  31 };
  32
  33 static int compare_func(const void *a, const void *b)
  34 {
  35         const struct usage_data *ua = a;
  36         const struct usage_data *ub = b;
  37         return strcmp(ua->aname, ub->aname);
  38 }
  39
  40 int main(void)
  41 {
  42         int i;
  43         int num_messages = sizeof(usage_array) / sizeof(usage_array[0]);
  44
  45         if (num_messages == 0)
  46                 return 0;
  47
  48         qsort(usage_array,
  49                 num_messages, sizeof(usage_array[0]),
  50                 compare_func);
  51         for (i = 0; i < num_messages; i++)
  52                 write(STDOUT_FILENO, usage_array[i].usage, strlen(usage_array[i].usage) + 1);
  53
  54         return 0;
  55 }