1/* vi: set sw=4 ts=4: */
2/*
3 *
4 * dmesg - display/control kernel ring buffer.
5 *
6 * Copyright 2006 Rob Landley <rob@landley.net>
7 * Copyright 2006 Bernhard Fischer <rep.nop@aon.at>
8 *
9 * Licensed under GPLv2, see file LICENSE in this tarball for details.
10 */
11
12#include <sys/klog.h>
13#include "libbb.h"
14
15int dmesg_main(int argc, char **argv);
16int dmesg_main(int argc, char **argv)
17{
18	char *size, *level;
19	int flags = getopt32(argv, "cs:n:", &size, &level);
20
21	if (flags & 4) {
22		if (klogctl(8, NULL, xatoul_range(level, 0, 10)))
23			bb_perror_msg_and_die("klogctl");
24	} else {
25		int len;
26		char *buf;
27
28		len = (flags & 2) ? xatoul_range(size, 2, INT_MAX) : 16384;
29		buf = xmalloc(len);
30		if (0 > (len = klogctl(3 + (flags & 1), buf, len)))
31			bb_perror_msg_and_die("klogctl");
32
33		// Skip <#> at the start of lines, and make sure we end with a newline.
34
35		if (ENABLE_FEATURE_DMESG_PRETTY) {
36			int last = '\n';
37			int in;
38
39			for (in = 0; in<len;) {
40				if (last == '\n' && buf[in] == '<') in += 3;
41				else putchar(last = buf[in++]);
42			}
43			if (last != '\n') putchar('\n');
44		} else {
45			write(1,buf,len);
46			if (len && buf[len-1]!='\n') putchar('\n');
47		}
48
49		if (ENABLE_FEATURE_CLEAN_UP) free(buf);
50	}
51
52	return 0;
53}
54