diff options
| -rw-r--r-- | src/io.c | 5 | ||||
| -rw-r--r-- | test/io.rb | 5 |
2 files changed, 10 insertions, 0 deletions
@@ -630,8 +630,13 @@ mrb_io_sysread(mrb_state *mrb, mrb_value io) if (mrb_nil_p(buf)) { buf = mrb_str_new(mrb, NULL, maxlen); } + + mrb_str_modify(mrb, RSTRING(buf)); + if (RSTRING_LEN(buf) != maxlen) { buf = mrb_str_resize(mrb, buf, maxlen); + } else { + mrb_str_modify(mrb, RSTRING(buf)); } fptr = (struct mrb_io *)io_get_open_fptr(mrb, io); diff --git a/test/io.rb b/test/io.rb index 5a6dbf146..df646977a 100644 --- a/test/io.rb +++ b/test/io.rb @@ -250,6 +250,11 @@ assert('IO.sysopen, IO#sysread') do io.sysread(10000) io.sysread(10000) end + + assert_raise RuntimeError do + io.sysread(5, "abcde".freeze) + end + io.close assert_equal "", io.sysread(0) assert_raise(IOError) { io.sysread(1) } |