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Do not issue warning when calling set_encoding if string is chilled #128

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Do not issue warning when calling set_encoding if string is chilled #128

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8b3ade2
Do not issue warning when calling set_encoding if string is chilled
jeremyevans Apr 15, 2025
5a5287e
Fix Ruby 3.4 check
jeremyevans Apr 15, 2025
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8 changes: 7 additions & 1 deletion ext/stringio/stringio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@ STRINGIO_VERSION = "3.1.6";
#include "ruby.h"
#include "ruby/io.h"
#include "ruby/encoding.h"
#include "ruby/version.h"
#if defined(HAVE_FCNTL_H) || defined(_WIN32)
#include <fcntl.h>
#elif defined(HAVE_SYS_FCNTL_H)
Expand Down Expand Up @@ -1859,7 +1860,12 @@ strio_set_encoding(int argc, VALUE *argv, VALUE self)
}
}
ptr->enc = enc;
if (!NIL_P(ptr->string) && WRITABLE(self)) {
if (!NIL_P(ptr->string) && WRITABLE(self)
#if (RUBY_API_VERSION_MAJOR == 3 && RUBY_API_VERSION_MINOR >= 4) || RUBY_API_VERSION_MAJOR >= 4
// Do not attempt to modify chilled strings on Ruby 3.4+
&& !FL_TEST_RAW(ptr->string, RUBY_FL_USER2 | RUBY_FL_USER3)
#endif
) {
rb_enc_associate(ptr->string, enc);
}

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7 changes: 7 additions & 0 deletions test/stringio/test_stringio.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -1057,6 +1057,13 @@ def test_chilled_string_string_set
assert_equal("test", io.string)
assert_same(chilled_string, io.string)
end

def test_chilled_string_set_enocoding
chilled_string = eval(%{""})
io = StringIO.new(chilled_string)
assert_warning("") { io.set_encoding(Encoding::BINARY) }
assert_same(chilled_string, io.string)
end
end

private
Expand Down