commit decad08ef57aa3cf3960ce65e29b194cb97c6d22
author Paul Sokolovsky <pfalcon@users.sourceforge.net> Fri Jan 03 23:36:56 2014 +0200
committer Paul Sokolovsky <pfalcon@users.sourceforge.net> Sat Jan 04 02:35:48 2014 +0200
tree 90081a761735054d7c1212106550b858b2562810
parent 59800afae9f74571eea5bb463a28fd9bd8251150

str: Handle non-positive slice indexes.

py/objstr.c

diff --git a/py/objstr.c b/py/objstr.c
index 46adabc..54dd087 100644
--- a/py/objstr.c
+++ b/py/objstr.c
@@ -39,6 +39,13 @@
                 int start, stop, step;
                 mp_obj_slice_get(rhs_in, &start, &stop, &step);
                 assert(step == 1);
+                int len = strlen(lhs_str);
+                if (start < 0) {
+                    start = len + start;
+                }
+                if (stop <= 0) {
+                    stop = len + stop;
+                }
                 return mp_obj_new_str(qstr_from_strn_copy(lhs_str + start, stop - start));
             } else {
                 // Throw TypeError here