diff options
Diffstat (limited to 'mrbgems/mruby-io')
| -rw-r--r-- | mrbgems/mruby-io/src/io.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/mrbgems/mruby-io/src/io.c b/mrbgems/mruby-io/src/io.c index 3d9d2b48a..c0d2a51d7 100644 --- a/mrbgems/mruby-io/src/io.c +++ b/mrbgems/mruby-io/src/io.c @@ -1493,6 +1493,7 @@ mrb_io_readchar(mrb_state *mrb, mrb_value self) #endif mrb_get_args(mrb, "S", &buf); + mrb_assert(RSTRING_LEN(buf) > 0); mrb_assert(RSTRING_PTR(buf) != NULL); mrb_str_modify(mrb, RSTRING(buf)); #ifdef MRB_UTF8_STRING |