#include "git-compat-util.h"

#include "copy.h"

#include "path.h"

#include "gettext.h"

#include "strbuf.h"

#include "abspath.h"

int copy_fd(int ifd, int ofd)

{

  while (1) {

    char buffer[8192];

    ssize_t len = xread(ifd, buffer, sizeof(buffer));

    if (!len)

      break;

    if (len < 0)

      return COPY_READ_ERROR;

    if (write_in_full(ofd, buffer, len) < 0)

      return COPY_WRITE_ERROR;

  }

  return 0;

}

static int copy_times(const char *dst, const char *src)

{

  struct stat st;

  struct utimbuf times;

  if (stat(src, &st) < 0)

    return -1;

  times.actime = st.st_atime;

  times.modtime = st.st_mtime;

  if (utime(dst, &times) < 0)

    return -1;

  return 0;

}

int copy_file(const char *dst, const char *src, int mode)

{

  int fdi, fdo, status;

  mode = (mode & 0111) ? 0777 : 0666;

  if ((fdi = open(src, O_RDONLY)) < 0)

    return fdi;

  if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {

    close(fdi);

    return fdo;

  }

  status = copy_fd(fdi, fdo);

  switch (status) {

  case COPY_READ_ERROR:

    error_errno("copy-fd: read returned");

    break;

  case COPY_WRITE_ERROR:

    error_errno("copy-fd: write returned");

    break;

  }

  close(fdi);

  if (close(fdo) != 0)

    return error_errno("%s: close error", dst);

  if (!status && adjust_shared_perm(dst))

    return -1;

  return status;

}

int copy_file_with_time(const char *dst, const char *src, int mode)

{

  int status = copy_file(dst, src, mode);

  if (!status)

    return copy_times(dst, src);

  return status;

}