check_port.c

#include <libserialport.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
/* Example of how to get a list of serial ports on the system.
 *
 * This example file is released to the public domain. */

int main(int argc, char **argv)
{
  /* A pointer to a null-terminated array of pointers to
   * struct sp_port, which will contain the ports found.*/
  struct sp_port **port_list;
  char *search_name = NULL;
  bool found = false;
  bool search = false;
  if (argc>2)
  {
    printf("Usage %s <optional serial port to search>\n", argv[0]);
    return -1;
  }
  if (argc == 2) {
    search_name = argv[1];
    search = true;
  }
  if (!search) {
    printf("Getting port list.\n");
  }
  /* Call sp_list_ports() to get the ports. The port_list
   * pointer will be updated to refer to the array created. */
  enum sp_return result = sp_list_ports(&port_list);

  if (result != SP_OK) {
    printf("sp_list_ports() failed!\n");
    return -1;
  }

  /* Iterate through the ports. When port_list[i] is NULL
   * this indicates the end of the list. */
  int i;
  for (i = 0; port_list[i] != NULL; i++) {
    struct sp_port *port = port_list[i];

    /* Get the name of the port. */
    char *port_name = sp_get_port_name(port);
    if (!search) {
      printf("Found port: %s\n", port_name);
    } else {
      if (strcmp( search_name, port_name ) == 0) {
        found = true;
        break;
      }
    }
  }
  if (!search){
    printf("Found %d ports.\n", i);
    printf("Freeing port list.\n");
  }

  /* Free the array created by sp_list_ports(). */
  sp_free_port_list(port_list);

  /* Note that this will also free all the sp_port structures
   * it points to. If you want to keep one of them (e.g. to
   * use that port in the rest of your program), take a copy
   * of it first using sp_copy_port(). */

  return (search) ? !found : 0;
}