From 844b2c368fc4bf852ea1a5f24731ae4bdd6b2331 Mon Sep 17 00:00:00 2001 From: ksss Date: Sun, 21 May 2017 22:52:52 +0900 Subject: IO#sysread with 0 always return empty string --- src/io.c | 3 +++ test/io.rb | 1 + 2 files changed, 4 insertions(+) diff --git a/src/io.c b/src/io.c index 51a659f0e..2a24b18a4 100644 --- a/src/io.c +++ b/src/io.c @@ -625,6 +625,9 @@ mrb_io_sysread(mrb_state *mrb, mrb_value io) if (maxlen < 0) { return mrb_nil_value(); } + else if (maxlen == 0) { + return mrb_str_new(mrb, NULL, maxlen); + } if (mrb_nil_p(buf)) { buf = mrb_str_new(mrb, NULL, maxlen); diff --git a/test/io.rb b/test/io.rb index 955481b9f..5a95961f3 100644 --- a/test/io.rb +++ b/test/io.rb @@ -234,6 +234,7 @@ assert('IO.sysopen, IO#sysread') do io.sysread(10000) end io.close + assert_equal "", io.sysread(0) io.closed? end -- cgit v1.2.3