Rewrite of dmesg, smaller and simpler.

diff --git a/util-linux/dmesg.c b/util-linux/dmesg.c
index 2166edba33defa4e322cf646fb9128dbe5ea9c2f..6adba159a8e0a22d5caba8cd13243107659ee4c6 100644 (file)
--- a/util-linux/dmesg.c
+++ b/util-linux/dmesg.c
@@ -1,80 +1,35 @@
-/* vi: set sw=4 ts=4: */
-/* 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 ts=4:
+ * 
+ * dmesg - display/control kernel ring buffer.
  *
- * from util-linux -- adapted for busybox by
- * Erik Andersen <andersen@codepoet.org>. I ripped out Native Language
- * Support, replaced getopt, added some gotos for redundant stuff.
+ * Copyring 2006 Rob Landley <rob@landley.net>
  *
- * Audited and cleaned up on 7 March 2003 to reduce size of
- * check error handling by Erik Andersen <andersen@codepoet.org>
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <sys/klog.h>
-
 #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, *tmp;
-       int bufsize = 8196;
-       int i, n = 0;
-       int c = 3;
-
-       i = bb_getopt_ulflags(argc, argv, "cn:s:", &buf, &tmp);
-       if (i & 1)
-                               c = 4;
-       if (i & 2) {
-                               c = 8;
-                               n = bb_xgetlarg(buf, 10, 0, 10);
-       }
-       if (i & 4)
-                               /* I think a 512k max kernel ring buffer is big enough for
-                                * anybody, as the default is 16k...  Could be wrong though.
-                                * If so I'm sure I'll hear about it by the enraged masses*/
-                               bufsize = bb_xgetlarg(tmp, 10, 4096, 512*1024);
-
-       if (c == 8) {
-               if (klogctl(c, NULL, n) < 0)
-                       goto die_the_death;
-               goto all_done;
-       }
-
-       buf = xmalloc(bufsize);
-       if ((n = klogctl(c, buf, bufsize)) < 0)
-               goto die_the_death;
-
-       c = '\n';
-       for (i = 0; i < n; i++) {
-               if (c == '\n' && buf[i] == '<') {
-                       i++;
-                       while (buf[i] >= '0' && buf[i] <= '9')
-                               i++;
-                       if (buf[i] == '>')
-                               i++;
-               }
-               c = buf[i];
-               putchar(c);
-       }
-       if (c != '\n')
-               putchar('\n');
-all_done:
-       if (ENABLE_FEATURE_CLEAN_UP) {
-               free(buf);
+       char *size, *level;
+       int flags = bb_getopt_ulflags(argc, argv, "c:s:n:", &size, &level);
+
+       if (flags & 4) {
+               if(klogctl(8, NULL, bb_xgetlarg(size, 10, 0, 10)))
+                       bb_perror_msg_and_die("klogctl");
+       } else {
+               int len;
+               char *buf;
+
+               len = (flags & 2) ? bb_xgetlarg(size, 10, 4096, INT_MAX) : 16384;
+               buf = xmalloc(len);
+               if (0 > (len = klogctl(3 + (flags & 1), buf, len)))
+                       bb_perror_msg_and_die("klogctl");
+               write(1,buf,len);
+               if (len && buf[len-1]!='\n') putchar('\n');
        }
 
-       return EXIT_SUCCESS;
-die_the_death:
-       bb_perror_nomsg_and_die();
+       return 0;
 }