don't assume buffer passed to pty_write is null terminated

* testsuite/systemtap.examples/general/grapher.stp: Use kernel_char
  instead of kernel_string to dig characters out of buffer.

1 files changed, 3 insertions, 7 deletions

diff --git a/testsuite/systemtap.examples/general/grapher.stp b/testsuite/systemtap.examples/general/grapher.stp
index 46f5063c..a830b153 100755
--- a/testsuite/systemtap.examples/general/grapher.stp
+++ b/testsuite/systemtap.examples/general/grapher.stp
@@ -38,17 +38,13 @@ probe kernel.function("pty_write") {
     count = %(kernel_v>="2.6.31" %? $c %: $count %)
     if (count > 0) {
         printf("pty %d ", gettimeofday_ms())
-        str = kernel_string($buf)
+        str = $buf
         for (i = 0; i < count; ++i) {
             if (i > 1)
                 printf("\n")
-            # yes it's gross
-            c = substr(str, i, 1)
-            printf("%s", text_str(c))
+            c = kernel_char(str + i)
+            printf("%c", c)
         }
         printf("%c", 0)
     }
 }
-
-
-