Fix tokenize function and test.

Previous implementation was error-prone, because allowed returning empty
tokens (mimiced strsep()), which is fine if there is a NULL semantic.
Unfortunately SystemTap doesn't provide it in scripts and has only blank
string (""), therefore testing against it was misleading.
The solution is to return only non-empty tokens (mimic strtok()).

* tapset/string.stp: Fix tokenize.
* testsuite/systemtap.string/tokenize.stp: Improve and add case with
  more than one delimiter in the delim string.
* testsuite/systemtap.string/tokenize.exp: Ditto.
* stapfuncs.3stap.in: Update tokenize description.
* doc/langref.tex: Ditto.

Signed-off-by: Josh Stone <jistone@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/doc/langref.tex b/doc/langref.tex
index 5aefa278..5a149d19 100644
--- a/doc/langref.tex
+++ b/doc/langref.tex
@@ -3160,8 +3160,8 @@ General syntax:
 tokenize:string (input:string, delim:string)
 \end{verbatim}
 \end{vindent}
-This function returns the next token in the given input string, where 
-the tokens are delimited by one of the characters in the delim string.
+This function returns the next non-empty token in the given input string,
+where the tokens are delimited by characters in the delim string.
 If the input string is non-NULL, it returns the first token. If the input string
 is NULL, it returns the next token in the string passed in the previous call
 to tokenize. If no delimiter is found, the entire remaining input string