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Reduce write() calls for explicitly separated buffers

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This can improve performance for `string split ""` for up to 1.8x.
This commit is contained in:
Fabian Boehm 2022-09-27 16:32:49 +02:00
parent 5d5709b859
commit 5ada59996f
1 changed files with 6 additions and 2 deletions
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8
src/io.cpp
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@ -316,9 +316,13 @@ void output_stream_t::append_narrow_buffer(const separated_buffer_t &buffer) {
void output_stream_t::append_with_separation(const wchar_t *s, size_t len, separation_type_t type,
bool want_newline) {
append(s, len);
if (type == separation_type_t::explicitly && want_newline) {
append(L'\n');
// Try calling "append" less - it might write() to an fd
wcstring buf{s, len};
buf.push_back(L'\n');
append(buf);
} else {
append(s, len);
}
}