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// slang-process-util.cpp
#include "slang-process-util.h"
#include "slang-string.h"
#include "slang-string-escape-util.h"
#include "slang-string-util.h"
#include "../../slang-com-helper.h"
namespace Slang {
/* static */SlangResult ProcessUtil::execute(const CommandLine& commandLine, ExecuteResult& outExecuteResult)
{
RefPtr<Process> process;
SLANG_RETURN_ON_FAIL(Process::create(commandLine, 0, process));
SLANG_RETURN_ON_FAIL(readUntilTermination(process, outExecuteResult));
return SLANG_OK;
}
static Index _getCount(List<Byte>* buf)
{
return buf ? buf->getCount() : 0;
}
// We may want something more sophisticated here, if bytes is something other than ascii/utf8
static String _getText(const ConstArrayView<Byte>& bytes)
{
StringBuilder buf;
StringUtil::appendStandardLines(UnownedStringSlice((const char*)bytes.begin(), (const char*)bytes.end()), buf);
return buf.produceString();
}
/* static */SlangResult ProcessUtil::readUntilTermination(Process* process, ExecuteResult& outExecuteResult)
{
List<Byte> stdOut;
List<Byte> stdError;
SLANG_RETURN_ON_FAIL(readUntilTermination(process, &stdOut, &stdError));
// Get the return code
outExecuteResult.resultCode = ExecuteResult::ResultCode(process->getReturnValue());
outExecuteResult.standardOutput = _getText(stdOut.getArrayView());
outExecuteResult.standardError = _getText(stdError.getArrayView());
return SLANG_OK;
}
/* static */SlangResult ProcessUtil::readUntilTermination(Process* process, List<Byte>* outStdOut, List<Byte>* outStdError)
{
Stream* stdOutStream = process->getStream(StdStreamType::Out);
Stream* stdErrorStream = process->getStream(StdStreamType::ErrorOut);
while (!process->isTerminated())
{
const auto preCount = _getCount(outStdOut) + _getCount(outStdError);
SLANG_RETURN_ON_FAIL(StreamUtil::readOrDiscard(stdOutStream, 0, outStdOut));
if (stdErrorStream)
SLANG_RETURN_ON_FAIL(StreamUtil::readOrDiscard(stdErrorStream, 0, outStdError));
const auto postCount = _getCount(outStdOut) + _getCount(outStdError);
// If nothing was read, we can yield
if (preCount == postCount)
{
Process::sleepCurrentThread(0);
}
}
// Read anything remaining
for(;;)
{
const auto preCount = _getCount(outStdOut) + _getCount(outStdError);
StreamUtil::readOrDiscard(stdOutStream, 0, outStdOut);
if (stdErrorStream)
StreamUtil::readOrDiscard(stdErrorStream, 0, outStdError);
const auto postCount = _getCount(outStdOut) + _getCount(outStdError);
if (preCount == postCount)
break;
}
return SLANG_OK;
}
} // namespace Slang
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