allow people to display dmesg output without syslog levels

2 files changed, 39 insertions, 3 deletions

diff --git a/util-linux/Config.in b/util-linux/Config.in
index 501ed6bfc..65d670824 100644
--- a/util-linux/Config.in
+++ b/util-linux/Config.in
@@ -17,6 +17,26 @@ config CONFIG_DMESG
           are also logged to the system console.  Enable this option if you
           wish to enable the 'dmesg' utility.
 
+config CONFIG_FEATURE_DMESG_PRETTY
+        bool "pretty dmesg output"
+        default y
+        depends on CONFIG_DMESG
+        help
+          If you wish to scrub the syslog level from the output, say 'Y' here.
+          The syslog level is a string prefixed to every line with the form "<#>".
+
+          With this option you will see:
+            # dmesg
+            Linux version 2.6.17.4 .....
+            BIOS-provided physical RAM map:
+             BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
+
+          Without this option you will see:
+            # dmesg
+            <5>Linux version 2.6.17.4 .....
+            <6>BIOS-provided physical RAM map:
+            <6> BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
+
 config CONFIG_FBSET
         bool "fbset"
         default n
diff --git a/util-linux/dmesg.c b/util-linux/dmesg.c
index 2b59ee23d..ecfd90668 100644
--- a/util-linux/dmesg.c
+++ b/util-linux/dmesg.c
@@ -1,9 +1,9 @@
 /* vi: set sw=4 ts=4: */
 /*
- * 
  * dmesg - display/control kernel ring buffer.
  *
- * Copyring 2006 Rob Landley <rob@landley.net>
+ * Copyright 2006 Rob Landley <rob@landley.net>
+ * Copyright 2006 Erik Andersen <andersen@codepoet.org>
  *
  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
@@ -28,8 +28,24 @@ int dmesg_main(int argc, char *argv[])
                 buf = xmalloc(len);
                 if (0 > (len = klogctl(3 + (flags & 1), buf, len)))
                         bb_perror_msg_and_die("klogctl");
-                write(1,buf,len);
+
+#ifdef CONFIG_FEATURE_DMESG_PRETTY
+                {
+                        char newline = '\n';
+                        int i;
+                        for (i=0; i<len; ++i) {
+                                if (newline == '\n' && buf[i] == '<')
+                                        i += 3; /* skip <#> */
+                                putchar(newline=buf[i]);
+                        }
+                        if (newline != '\n') putchar('\n');
+                }
+#else
+                write(1, buf, len);
                 if (len && buf[len-1]!='\n') putchar('\n');
+#endif
+
+                if (ENABLE_FEATURE_CLEAN_UP) free(buf);
         }
 
         return 0;