-/* dmesg.c -- Print out the contents of the kernel ring buffer
- * Created: Sat Oct 9 16:19:47 1993
- * Revised: Thu Oct 28 21:52:17 1993 by faith@cs.unc.edu
- * Copyright 1993 Theodore Ts'o (tytso@athena.mit.edu)
- * This program comes with ABSOLUTELY NO WARRANTY.
- * Modifications by Rick Sladkey (jrs@world.std.com)
- * Larger buffersize 3 June 1998 by Nicolai Langfeldt, based on a patch
- * by Peeter Joot. This was also suggested by John Hudson.
- * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
- * - added Native Language Support
+/* vi: set sw=4 ts=4: */
+/*
+ *
+ * dmesg - display/control kernel ring buffer.
*
- * from util-linux -- adapted for busybox by
- * Erik Andersen <andersee@debian.org>. I ripped out Native Language
- * Support, replaced getopt, added some gotos for redundant stuff.
+ * Copyright 2006 Rob Landley <rob@landley.net>
+ * Copyright 2006 Bernhard Fischer <rep.nop@aon.at>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-#include "internal.h"
-#include <linux/unistd.h>
-#include <stdio.h>
-#include <getopt.h>
-#include <stdlib.h>
-
-#if __GNU_LIBRARY__ < 5
-
-#ifndef __alpha__
-# define __NR_klogctl __NR_syslog
- static inline _syscall3(int, klogctl, int, type, char *, b, int, len);
-#else /* __alpha__ */
-#define klogctl syslog
-#endif
-
-#else
-# include <sys/klog.h>
-#endif
-
-static const char dmesg_usage[] = "dmesg [-c] [-n level] [-s bufsize]\n";
+#include "busybox.h"
+#include <unistd.h>
+#include <sys/klog.h>
-int dmesg_main( int argc, char** argv )
+int dmesg_main(int argc, char *argv[])
{
- char *buf;
- int bufsize=8196;
- int i;
- int n;
- int level = 0;
- int lastc;
- int cmd = 3;
-
- /* Parse any options */
- while (argc && **argv == '-') {
- while (*++(*argv))
- switch (**argv) {
- case 'c':
- cmd = 4;
- break;
- case 'n':
- cmd = 8;
- if (--argc == 0)
- goto end;
- level = atoi (*(++argv));
- --argc;
- ++argv;
- break;
- case 's':
- if (--argc == 0)
- goto end;
- bufsize = atoi (*(++argv));
- --argc;
- ++argv;
- break;
- default:
- goto end;
- }
- }
-
- if (argc > 1) {
- goto end;
- }
-
- if (cmd == 8) {
- n = klogctl( cmd, NULL, level );
- if (n < 0) {
- goto klogctl_error;
- }
- exit( TRUE );
- }
-
- if (bufsize < 4096) bufsize = 4096;
- buf = (char*)malloc(bufsize);
- n = klogctl( cmd, buf, bufsize );
- if (n < 0) {
- goto klogctl_error;
- }
-
- lastc = '\n';
- for (i = 0; i < n; i++) {
- if ((i == 0 || buf[i - 1] == '\n') && buf[i] == '<') {
- i++;
- while (buf[i] >= '0' && buf[i] <= '9')
- i++;
- if (buf[i] == '>')
- i++;
- }
- lastc = buf[i];
- putchar( lastc );
- }
- if (lastc != '\n')
- putchar( '\n' );
- exit( TRUE);
-end:
- usage( dmesg_usage);
- exit (FALSE);
-klogctl_error:
- perror( "klogctl" );
- exit( FALSE );
-
+ char *size, *level;
+ int flags = bb_getopt_ulflags(argc, argv, "cs:n:", &size, &level);
+
+ if (flags & 4) {
+ if (klogctl(8, NULL, bb_xgetlarg(level, 10, 0, 10)))
+ bb_perror_msg_and_die("klogctl");
+ } else {
+ int len;
+ char *buf;
+
+ len = (flags & 2) ? bb_xgetlarg(size, 10, 2, INT_MAX) : 16384;
+ buf = xmalloc(len);
+ if (0 > (len = klogctl(3 + (flags & 1), buf, len)))
+ bb_perror_msg_and_die("klogctl");
+
+ // Skip <#> at the start of lines, and make sure we end with a newline.
+
+ if (ENABLE_FEATURE_DMESG_PRETTY) {
+ int last = '\n';
+ int in;
+
+ for (in = 0; in<len;) {
+ if (last == '\n' && buf[in] == '<') in += 3;
+ else putchar(last = buf[in++]);
+ }
+ if (last != '\n') putchar('\n');
+ } else {
+ write(1,buf,len);
+ if (len && buf[len-1]!='\n') putchar('\n');
+ }
+
+ if (ENABLE_FEATURE_CLEAN_UP) free(buf);
+ }
+
+ return 0;
}