sink_file.cc

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#include <cerrno>
#include <cstdio>
#include <string>

#include "sink_file.h"

namespace cvmfs {

int64_t FileSink::Write(const void *buf, uint64_t sz) {
  size_t ret = fwrite(buf, 1ul, sz, file_);

  if (ferror(file_) != 0) {
    // ferror does not tell us what exactly the error is
    // and errno is also not set
    // so just return generic I/O error flag
    return -EIO;
  }

  return static_cast<int64_t>(ret);
}

int FileSink::Reset() {
  return ((fflush(file_) == 0) &&
          (ftruncate(fileno(file_), 0) == 0) &&
          (freopen(NULL, "w", file_) == file_)) ? 0 : -errno;
}

int FileSink::Purge() {
  if (is_owner_ && file_) {
    int ret = fclose(file_);
    file_ = NULL;
    if (ret != 0) {
      return -errno;
    }

    return 0;
  } else {
    return Reset();
  }
}

std::string FileSink::Describe() {
  std::string result = "File sink with ";
  result += IsValid() ? " valid file pointer" : " invalid file pointer";
  return result;
}
void FileSink::Adopt(FILE *file, bool is_owner) {
  if (is_owner_ && file_) {
    (void) fclose(file_);
  }

  is_owner_ = is_owner;
  file_ = file;
}
}  // namespace cvmfs