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io.c: clear Strings we create for IO.copy_stream

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While we can't recycle strings after giving them rb_funcall*,
we can reduce their malloc overhead by resizing them to zero.
This only affects cases where either `src' or `dst' is a non-IO
object and either `copy_length' is passed or there is
pre-existing data in the read buffer.

* io.c (copy_stream_fallback_body): clear when done with `copy_length'
  (copy_stream_body): clear when done with pre-existing read buffer

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61632 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
normal 2018-01-05 21:14:19 +00:00
parent a55abcc0ca
commit 6776e0bc99
1 changed files with 5 additions and 2 deletions
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7
io.c
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@ -11163,8 +11163,10 @@ copy_stream_fallback_body(VALUE arg)
l = buflen;
}
else {
if (rest == 0)
break;
if (rest == 0) {
rb_str_resize(buf, 0);
break;
}
l = buflen < rest ? buflen : (long)rest;
}
if (stp->src_fd == -1) {
@ -11305,6 +11307,7 @@ copy_stream_body(VALUE arg)
}
else /* others such as StringIO */
rb_io_write(dst_io, str);
rb_str_resize(str, 0);
stp->total += len;
if (stp->copy_length != (off_t)-1)
stp->copy_length -= len;