applets/usage_pod.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Copyright (C) 2009 Denys Vlasenko.
   4  *
   5  * Licensed under GPLv2, see file LICENSE in this source tree.
   6  */
   7 #include <unistd.h>
   8 #include <stdint.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <stdio.h>
  12
  13 #include "autoconf.h"
  14
  15 #define SKIP_applet_main
  16 #define ALIGN1 /* nothing, just to placate applet_tables.h */
  17 #define ALIGN2 /* nothing, just to placate applet_tables.h */
  18 #include "applet_tables.h"
  19
  20 /* Since we can't use platform.h, have to do this again by hand: */
  21 #if ENABLE_NOMMU
  22 # define BB_MMU 0
  23 # define USE_FOR_NOMMU(...) __VA_ARGS__
  24 # define USE_FOR_MMU(...)
  25 #else
  26 # define BB_MMU 1
  27 # define USE_FOR_NOMMU(...)
  28 # define USE_FOR_MMU(...) __VA_ARGS__
  29 #endif
  30
  31 #include "usage.h"
  32 #define MAKE_USAGE(aname, usage) { aname, usage },
  33 static struct usage_data {
  34         const char *aname;
  35         const char *usage;
  36 } usage_array[] = {
  37 #include "applets.h"
  38 };
  39
  40 static int compare_func(const void *a, const void *b)
  41 {
  42         const struct usage_data *ua = a;
  43         const struct usage_data *ub = b;
  44         return strcmp(ua->aname, ub->aname);
  45 }
  46
  47 int main(void)
  48 {
  49         int col, len2;
  50
  51         int i;
  52         int num_messages = sizeof(usage_array) / sizeof(usage_array[0]);
  53
  54         if (num_messages == 0)
  55                 return 0;
  56
  57         qsort(usage_array,
  58                 num_messages, sizeof(usage_array[0]),
  59                 compare_func);
  60
  61         col = 0;
  62         for (i = 0; i < num_messages; i++) {
  63                 len2 = strlen(usage_array[i].aname) + 2;
  64                 if (col >= 76 - len2) {
  65                         printf(",\n");
  66                         col = 0;
  67                 }
  68                 if (col == 0) {
  69                         col = 6;
  70                         printf("\t");
  71                 } else {
  72                         printf(", ");
  73                 }
  74                 printf(usage_array[i].aname);
  75                 col += len2;
  76         }
  77         printf("\n\n");
  78
  79         printf("=head1 COMMAND DESCRIPTIONS\n\n");
  80         printf("=over 4\n\n");
  81
  82         for (i = 0; i < num_messages; i++) {
  83                 if (usage_array[i].aname[0] >= 'a' && usage_array[i].aname[0] <= 'z'
  84                  && usage_array[i].usage[0] != NOUSAGE_STR[0]
  85                 ) {
  86                         printf("=item B<%s>\n\n", usage_array[i].aname);
  87                         if (usage_array[i].usage[0])
  88                                 printf("%s %s\n\n", usage_array[i].aname, usage_array[i].usage);
  89                         else
  90                                 printf("%s\n\n", usage_array[i].aname);
  91                 }
  92         }
  93         return 0;
  94 }
  95
  96 /* TODO: we used to make options bold with B<> and output an example too:
  97
  98 =item B<cat>
  99
 100 cat [B<-u>] [FILE]...
 101
 102 Concatenate FILE(s) and print them to stdout
 103
 104 Options:
 105         -u      Use unbuffered i/o (ignored)
 106
 107 Example:
 108         $ cat /proc/uptime
 109         110716.72 17.67
 110
 111 */