perf tools: Fix backslash processing on trace print formats

The handling of backslashes was broken. It would stop parsing
when encountering one. Also, '\n', '\t', '\r' and '\\' were not
converted.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <20091014194357.521974680@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index a05c714..2b75ec2 100644 (file)
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -522,7 +522,10 @@ static enum event_type __read_token(char **tok)
                        last_ch = ch;
                        ch = __read_char();
                        buf[i++] = ch;
-               } while (ch != quote_ch && last_ch != '\\');
+                       /* the '\' '\' will cancel itself */
+                       if (ch == '\\' && last_ch == '\\')
+                               last_ch = 0;
+               } while (ch != quote_ch || last_ch == '\\');
                /* remove the last quote */
                i--;
                goto out;
@@ -2325,7 +2328,27 @@ static void pretty_print(void *data, int size, struct event *event)
 
        for (; *ptr; ptr++) {
                ls = 0;
-               if (*ptr == '%') {
+               if (*ptr == '\\') {
+                       ptr++;
+                       switch (*ptr) {
+                       case 'n':
+                               printf("\n");
+                               break;
+                       case 't':
+                               printf("\t");
+                               break;
+                       case 'r':
+                               printf("\r");
+                               break;
+                       case '\\':
+                               printf("\\");
+                               break;
+                       default:
+                               printf("%c", *ptr);
+                               break;
+                       }
+
+               } else if (*ptr == '%') {
                        saveptr = ptr;
                        show_func = 0;
  cont_process: