Merge branch 'fixes' of https://github.com/rudimeier/util-linux

[thirdparty/util-linux.git] / lib / linux_version.c

#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
# 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