[Toybox] [PATCH] dmesg: add -t suppress timestamp flag

[enh]

Author: Mark Salyzyn <salyzyn at google.com>
Date:   Fri May 1 07:42:22 2015 -0700

    dmesg: add -t suppress timestamp flag

diff --git a/toys/lsb/dmesg.c b/toys/lsb/dmesg.c
index c887675..50da8a8 100644
--- a/toys/lsb/dmesg.c
+++ b/toys/lsb/dmesg.c
@@ -5,13 +5,13 @@
  * http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/dmesg.html

 // We care that FLAG_c is 1, so keep c at the end.
-USE_DMESG(NEWTOY(dmesg, "rs#<1n#c", TOYFLAG_BIN))
+USE_DMESG(NEWTOY(dmesg, "trs#<1n#c", TOYFLAG_BIN))

 config DMESG
   bool "dmesg"
   default y
   help
-    usage: dmesg [-n LEVEL] [-s SIZE] | -c
+    usage: dmesg [-n LEVEL] [-s SIZE] [-r|-t] | -c

     Print or control the kernel ring buffer.

@@ -19,6 +19,7 @@ config DMESG
     -n	Set kernel logging LEVEL (1-9)
     -r	Raw output (with <level markers>)
     -s	Show the last SIZE many bytes
+    -t	Don't print kernel's timestamps
 */

 #define FOR_dmesg
@@ -32,6 +33,9 @@ GLOBALS(

 void dmesg_main(void)
 {
+  if ((toys.optflags & FLAG_r) && (toys.optflags & FLAG_t)) {
+    error_exit("dmesg: -r and -t are mutually exclusive options");
+  }
   // For -n just tell kernel to which messages to keep.
   if (toys.optflags & FLAG_n) {
     if (klogctl(8, NULL, TT.level)) perror_exit("klogctl");
@@ -47,12 +51,20 @@ void dmesg_main(void)
     if (size < 0) error_exit("klogctl");
     data[size] = 0;

-    // Filter out level markers.
+    // Filter out level markers and optionally time markers
     if (!(toys.optflags & FLAG_r)) while ((from - data) < size) {
-      if ((from == data || from[-1] == '\n') && *from == '<') {
-        int i = stridx(from, '>');
+      if (from == data || from[-1] == '\n') {
+        if (*from == '<') {
+          int i = stridx(from, '>');
+
+          if (i>0) from += i+1;
+        }
+        if ((*from == '[') && (toys.optflags & FLAG_t)) {
+          int i = stridx(from, ']');

-        if (i>0) from += i+1;
+          if (i>0) from += i+1;
+          if (*from == ' ') ++from;
+        }
       }
       *(to++) = *(from++);
     } else to = data+size;