USBPcapCMD: Add help commandline option.

USBPcapCMD/cmd.c

@@ -187,19 +187,22 @@ int __cdecl main(int argc, CHAR **argv)
 
  /* Too bad Microsoft compiler does not support C99...
  options = gopt_sort(&argc, argv, gopt_start(
+ gopt_option('h', 0, gopt_shorts('h, '?'), gopt_longs("help")),
  gopt_option('d', GOPT_ARG, gopt_shorts('d'), gopt_longs("device")),
  gopt_option('o', GOPT_ARG, gopt_shorts('o'), gopt_longs("output")),
  gopt_option('s', GOPT_ARG, gopt_shorts('s'), gopt_longs("snaplen")),
  gopt_option('b', GOPT_ARG, gopt_shorts('b'), gopt_longs("bufferlen")),
  gopt_option('I', 0, gopt_shorts('I'), gopt_longs("init-non-standard-hwids"))));
  */
 
+ const char *const h_long[] = {"help", NULL};
  const char *const d_long[] = {"device", NULL};
  const char *const o_long[] = {"output", NULL};
  const char *const s_long[] = {"snaplen", NULL};
  const char *const b_long[] = {"bufferlen", NULL};
  const char *const I_long[] = {"init-non-standard-hwids", NULL};
  opt_spec_t opt_specs[] = {
+ {'h', 0, "h?", h_long},
  {'d', GOPT_ARG, "d", d_long},
  {'o', GOPT_ARG, "o", o_long},
  {'s', GOPT_ARG, "s", s_long},
@@ -215,6 +218,30 @@ int __cdecl main(int argc, CHAR **argv)
  data.snaplen = 65535;
  data.bufferlen = DEFAULT_INTERNAL_KERNEL_BUFFER_SIZE;
 
+ if (gopt(options, 'h'))
+ {
+ printf("Usage: USBPcapCMD.exe [options]\n"
+ " -h, -?, --help\n"
+ " Prints this help.\n"
+ " -d <device>, --device <device>\n"
+ " USBPcap control device to open. Example: -d \\\\.\\USBPcap1.\n"
+ " -o <file>, --output <file>\n"
+ " Output .pcap file name.\n"
+ " -s <len>, --snaplen <len>\n"
+ " Sets snapshot length.\n"
+ " -b <len>, --bufferlen <len>\n"
+ " Sets internal capture buffer length. Valid range <4096,134217728>.\n"
+ " -I, --init-non-standard-hwids\n"
+ " Initializes NonStandardHWIDs registry key used by USBPcapDriver.\n"
+ " This registry key is needed for USB 3.0 capture.\n");
+ return 0;
+ }
+
+ if (gopt(options, 'I'))
+ {
+ init_non_standard_roothub_hwid();
+ return 0;
+ }
 
  if (gopt_arg(options, 'd', &tmp))
  {
@@ -248,12 +275,6 @@ int __cdecl main(int argc, CHAR **argv)
  }
  }
 
- if (gopt(options, 'I'))
- {
- init_non_standard_roothub_hwid();
- return 0;
- }
-
  if (data.filename != NULL && data.device != NULL)
  {
  interactive = FALSE;