src/ac-power/ac-power.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <getopt.h>
   4
   5 #include "util.h"
   6
   7 static bool arg_verbose = false;
   8
   9 static void help(void) {
  10         printf("%s\n\n"
  11                "Report whether we are connected to an external power source.\n\n"
  12                "  -h --help             Show this help\n"
  13                "     --version          Show package version\n"
  14                "  -v --verbose          Show state as text\n"
  15                , program_invocation_short_name);
  16 }
  17
  18 static int parse_argv(int argc, char *argv[]) {
  19
  20         enum {
  21                 ARG_VERSION = 0x100,
  22         };
  23
  24         static const struct option options[] = {
  25                 { "help",    no_argument, NULL, 'h'         },
  26                 { "version", no_argument, NULL, ARG_VERSION },
  27                 { "verbose", no_argument, NULL, 'v'         },
  28                 {}
  29         };
  30
  31         int c;
  32
  33         assert(argc >= 0);
  34         assert(argv);
  35
  36         while ((c = getopt_long(argc, argv, "hv", options, NULL)) >= 0)
  37
  38                 switch (c) {
  39
  40                 case 'h':
  41                         help();
  42                         return 0;
  43
  44                 case ARG_VERSION:
  45                         return version();
  46
  47                 case 'v':
  48                         arg_verbose = true;
  49                         break;
  50
  51                 case '?':
  52                         return -EINVAL;
  53
  54                 default:
  55                         assert_not_reached("Unhandled option");
  56                 }
  57
  58         if (optind < argc) {
  59                 log_error("%s takes no arguments.", program_invocation_short_name);
  60                 return -EINVAL;
  61         }
  62
  63         return 1;
  64 }
  65
  66 static int run(int argc, char *argv[]) {
  67         int r;
  68
  69         /* This is mostly intended to be used for scripts which want
  70          * to detect whether AC power is plugged in or not. */
  71
  72         log_parse_environment();
  73         log_open();
  74
  75         r = parse_argv(argc, argv);
  76         if (r <= 0)
  77                 return r;
  78
  79         r = on_ac_power();
  80         if (r < 0)
  81                 return log_error_errno(r, "Failed to read AC status: %m");
  82
  83         if (arg_verbose)
  84                 puts(yes_no(r));
  85
  86         return r == 0;
  87 }
  88
  89 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);