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#include "util/stream/line_input.hh"
#include "util/exception.hh"
#include "util/file.hh"
#include "util/read_compressed.hh"
#include "util/stream/chain.hh"
#include <algorithm>
#include <vector>
namespace util { namespace stream {
void LineInput::Run(const ChainPosition &position) {
ReadCompressed reader(fd_);
// Holding area for beginning of line to be placed in next block.
std::vector<char> carry;
for (Link block(position); ; ++block) {
char *to = static_cast<char*>(block->Get());
char *begin = to;
char *end = to + position.GetChain().BlockSize();
std::copy(carry.begin(), carry.end(), to);
to += carry.size();
while (to != end) {
std::size_t got = reader.Read(to, end - to);
if (!got) {
// EOF
block->SetValidSize(to - begin);
++block;
block.Poison();
return;
}
to += got;
}
// Find the last newline.
char *newline;
for (newline = to - 1; ; --newline) {
UTIL_THROW_IF(newline < begin, Exception, "Did not find a newline in " << position.GetChain().BlockSize() << " bytes of input of " << NameFromFD(fd_) << ". Is this a text file?");
if (*newline == '\n') break;
}
// Copy everything after the last newline to the carry.
carry.clear();
carry.resize(to - (newline + 1));
std::copy(newline + 1, to, &*carry.begin());
block->SetValidSize(newline + 1 - begin);
}
}
}} // namespaces
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