/*

 * No copyright is claimed.  This code is in the public domain; do with

 * it what you wish.

 */

#include <stdio.h>

#include <sys/utsname.h>

#include "c.h"

#include "linux_version.h"

int get_linux_version (void)

{

  static int kver = -1;

  struct utsname uts;

  int x = 0, y = 0, z = 0;

  int n;

  if (kver != -1)

    return kver;

  if (uname(&uts))

    return kver = 0;

  n = sscanf(uts.release, "%d.%d.%d", &x, &y, &z);

  if (n < 1 || n > 3)

    return kver = 0;

  return kver = KERNEL_VERSION(x, y, z);

}

#ifdef TEST_PROGRAM_LINUXVERSION

# include <stdlib.h>

int main(int argc, char *argv[])

{

  int rc = EXIT_FAILURE;

  if (argc == 1) {

    printf("Linux version: %d\n", get_linux_version());

    rc = EXIT_SUCCESS;

  } else if (argc == 5) {

    const char *oper = argv[1];

    int x = atoi(argv[2]),

        y = atoi(argv[3]),

        z = atoi(argv[4]);

    int kver = get_linux_version();

    int uver = KERNEL_VERSION(x, y, z);

    if (strcmp(oper, "==") == 0)

      rc = kver == uver;

    else if (strcmp(oper, "<=") == 0)

      rc = kver <= uver;

    else if (strcmp(oper, ">=") == 0)

      rc = kver >= uver;

    else

      errx(EXIT_FAILURE, "unsupported operator");

    if (rc)

      printf("match\n");

    else

      printf("not-match [%d %s %d, x.y.z: %d.%d.%d]\n",

          kver, oper, uver, x, y, z);

    rc = rc ? EXIT_SUCCESS : EXIT_FAILURE;

  } else

     fprintf(stderr, "Usage:\n"

         "   %s [<oper> <x> <y> <z>]\n"

         "supported operators:\n"

         "   ==, <=, >=\n",

         program_invocation_short_name);

  return rc;

}

#endif