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bin: handle thousands of output files

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Fixes #534.  Test case is only on next branch.

* bin/common_file.hh, bin/common_file.cc: Make it possible
to reopen a closed file.
* bin/common_output.cc, bin/common_aoutput.cc: Add a heuristic
to decide when to close files.
* NEWS: Mention the issue.
This commit is contained in:
Alexandre Duret-Lutz 2023-07-24 16:56:24 +02:00
parent adca03a30a
commit bd1809f758
5 changed files with 67 additions and 1 deletions
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19
bin/common_file.cc
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@ -44,13 +44,30 @@ output_file::output_file(const char* name, bool force_append)
os_ = of_.get();
}
void
output_file::reopen_for_append(const std::string& name)
{
if (of_ && of_->is_open()) // nothing to do
return;
const char* cname = name.c_str();
if (cname[0] == '>' && cname[1] == '>')
cname += 2;
if (name[0] == '-' && name[1] == 0)
{
os_ = &std::cout;
return;
}
of_->open(cname, std::ios_base::app);
if (!*of_)
error(2, errno, "cannot reopen '%s'", cname);
}
void output_file::close(const std::string& name)
{
// We close of_, not os_, so that we never close std::cout.
if (os_)
os_->flush();
if (of_)
if (of_ && of_->is_open())
of_->close();
if (os_ && !*os_)
error(2, 0, "error writing to %s",