getopt_long 实例代码

static struct option const long_opts[] =
{
  {"device", required_argument, NULL, 'd'},
  {"address", required_argument, NULL, 'a'},
  {"size", required_argument, NULL, 's'},
  {"offset", required_argument, NULL, 'o'},
  {"count", required_argument, NULL, 'c'},
  {"file", required_argument, NULL, 'f'},
  {"verbose", no_argument, NULL, 'v'},
  {"help", no_argument, NULL, 'h'},
  {0, 0, 0, 0}
};

static void usage(const char* name)
{
  int i = 0;
  printf("%s\n\n", name);
  printf("usage: %s [OPTIONS]\n\n", name);
  printf("Write using SGDMA, optionally read input from a binary input file.\n\n");

  printf("  -%c (--%s) device (defaults to %s)\n", long_opts[i].val, long_opts[i].name, DEVICE_NAME_DEFAULT); i++;
  printf("  -%c (--%s) address of the start address on the AXI bus\n", long_opts[i].val, long_opts[i].name); i++;
  printf("  -%c (--%s) size of a single transfer\n", long_opts[i].val, long_opts[i].name); i++;
  printf("  -%c (--%s) page offset of transfer\n", long_opts[i].val, long_opts[i].name); i++;
  printf("  -%c (--%s) number of transfers\n", long_opts[i].val, long_opts[i].name); i++;
  printf("  -%c (--%s) filename to read/write the data of the transfers\n", long_opts[i].val, long_opts[i].name); i++;
  printf("  -%c (--%s) be more verbose during test\n", long_opts[i].val, long_opts[i].name); i++;
  printf("  -%c (--%s) print usage help and exit\n", long_opts[i].val, long_opts[i].name); i++;
}

static uint32_t getopt_integer(char *optarg)
{
  int rc;
  uint32_t value;
  rc = sscanf(optarg, "0x%x", &value);
  if (rc <= 0)
    rc = sscanf(optarg, "%ul", &value);
  printf("sscanf() = %d, value = 0x%08x\n", rc, (unsigned int)value);
  return value;
}

int main(int argc, char* argv[])
{
  int cmd_opt;
  char *device = DEVICE_NAME_DEFAULT;
  uint32_t address = 0;
  uint32_t size = 32;
  uint32_t offset = 0;
  uint32_t count = 1;
  char *filename = NULL;

  while ((cmd_opt = getopt_long(argc, argv, "vhc:f:d:a:s:o:", long_opts, NULL)) != -1)
  {
    switch (cmd_opt)
    {
      case 0:
        /* long option */
        break;
      case 'v':
        verbosity++;
        break;
      /* device node name */
      case 'd':
        //printf("'%s'\n", optarg);
        device = strdup(optarg);
        break;
      /* RAM address on the AXI bus in bytes */
      case 'a':
        address = getopt_integer(optarg);
        break;
      /* RAM size in bytes */
      case 's':
        size = getopt_integer(optarg);
        break;
      case 'o':
        offset = getopt_integer(optarg) & 4095;
        break;
      /* count */
      case 'c':
        count = getopt_integer(optarg);
        break;
      /* count */
      case 'f':
        filename = strdup(optarg);
        break;
      /* print usage help and exit */
      case 'h':
      default:
        usage(argv[0]);
        exit(0);
        break;
    }
  }
  printf("device = %s, address = 0x%08x, size = 0x%08x, offset = 0x%08x, count = %u\n", device, address, size, offset, count);
}

Refer: Xilinx XDMA Source Code

https://blog.csdn.net/qq_33850438/article/details/80172275