dmesg: add -t option to suppress timestamps

Signed-off-by: Karel Zak <kzak@redhat.com>

2 files changed, 25 insertions, 2 deletions

diff --git a/sys-utils/dmesg.1 b/sys-utils/dmesg.1
index dd2536211..d86aceea0 100644
--- a/sys-utils/dmesg.1
+++ b/sys-utils/dmesg.1
@@ -92,6 +92,8 @@ to query the kernel ring buffer.  This is 16392 by default.
 at first, 8192 since 1.3.54, 16384 since 2.1.113.)
 If you have set the kernel buffer to be larger than the default
 then this option can be used to view the entire buffer.
+.IP "\fB\-t, \-\-notime\fP"
+Don't print kernel's timestampts.
 .IP "\fB\-u, \-\-userspace\fP"
 Print userspace messages.
 .IP "\fB\-V, \-\-version\fP"
diff --git a/sys-utils/dmesg.c b/sys-utils/dmesg.c
index dc074b37d..867581d81 100644
--- a/sys-utils/dmesg.c
+++ b/sys-utils/dmesg.c
@@ -98,6 +98,7 @@ static const struct dmesg_name facility_names[] =
 #define DMESG_FL_LEVEL		(1 << 2)
 #define DMESG_FL_FACILITY	(1 << 3)
 #define DMESG_FL_DECODE		(1 << 4)
+#define DMESG_FL_NOTIME		(1 << 5)
 
 static void __attribute__((__noreturn__)) usage(FILE *out)
 {
@@ -120,6 +121,7 @@ static void __attribute__((__noreturn__)) usage(FILE *out)
 		" -n, --console-level=LEVEL set level of messages printed to console\n"
 		" -r, --raw                 print the raw message buffer\n"
 		" -s, --buffer-size=SIZE    buffer size to query the kernel ring buffer\n"
+		" -t, --notime              don't print messages timestamp\n"
 		" -u, --userspace           display userspace messages\n"
 		" -V, --version             output version information and exit\n"
 		" -x, --decode              decode facility and level to readable string\n\n"));
@@ -443,7 +445,22 @@ static void print_buffer(const char *buf, size_t size, int flags,
 		                           isset(levels, lev)) &&
 		    (fac < 0 || !(flags & DMESG_FL_FACILITY) ||
 		                          isset(facilities, fac))) {
-			size_t sz =  end - begin;
+			size_t sz;
+
+			if ((flags & DMESG_FL_NOTIME) && *begin == '[' &&
+			    (*(begin + 1) == ' ' || isdigit(*(begin + 1)))) {
+				/* ignore timestamp */
+				while (begin < end) {
+					begin++;
+					if (*(begin - 1) == ']')
+						break;
+				}
+			}
+
+			if (*begin == ' ')
+				begin++;
+
+			sz =  end - begin;
 
 			if ((flags & DMESG_FL_DECODE) && lev >= 0 && fac >= 0) {
 				printf("%-6s:%-6s: ", facility_names[fac].name,
@@ -484,6 +501,7 @@ int main(int argc, char *argv[])
 		{ "level",         required_argument, NULL, 'l' },
 		{ "raw",           no_argument,       NULL, 'r' },
 		{ "read-clear",    no_argument,	      NULL, 'c' },
+		{ "notime",        no_argument,       NULL, 't' },
 		{ "userspace",     no_argument,       NULL, 'u' },
 		{ "version",       no_argument,	      NULL, 'V' },
 		{ NULL,	           0, NULL, 0 }
@@ -493,7 +511,7 @@ int main(int argc, char *argv[])
 	bindtextdomain(PACKAGE, LOCALEDIR);
 	textdomain(PACKAGE);
 
-	while ((c = getopt_long(argc, argv, "Ccdef:hkl:n:rs:uVx", longopts, NULL)) != -1) {
+	while ((c = getopt_long(argc, argv, "Ccdef:hkl:n:rs:tuVx", longopts, NULL)) != -1) {
 
 		if (cmd != -1 && strchr("Ccnde", c))
 			errx(EXIT_FAILURE, "%s %s",
@@ -541,6 +559,9 @@ int main(int argc, char *argv[])
 			if (bufsize < 4096)
 				bufsize = 4096;
 			break;
+		case 't':
+			flags |= DMESG_FL_NOTIME;
+			break;
 		case 'u':
 			flags |= DMESG_FL_FACILITY;
 			for (n = 1; n < ARRAY_SIZE(facility_names); n++)