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src/subversion/subversion/libsvn_client/patch.c  view on Meta::CPAN

                  numbytes = 1;
                }
            }
        }
      else
        {
          if (str == NULL)
            str = svn_stringbuf_create_ensure(80, result_pool);
          svn_stringbuf_appendbyte(str, c);
        }

      if (*eol_str)
        break;
    }

  if (eof)
    *eof = found_eof;
  *line = str;

  return SVN_NO_ERROR;
}

/* Return in *OFFSET the current byte offset for reading from the
 * unpatched file content accessed via BATON.
 * Use SCRATCH_POOL for temporary allocations. */
static svn_error_t *
tell_file(void *baton, apr_off_t *offset, apr_pool_t *scratch_pool)
{
  apr_file_t *file = (apr_file_t *)baton;
  *offset = 0;
  SVN_ERR(svn_io_file_seek(file, APR_CUR, offset, scratch_pool));
  return SVN_NO_ERROR;
}

/* Seek to the specified by OFFSET in the unpatched file content accessed
 * via BATON. Use SCRATCH_POOL for temporary allocations. */
static svn_error_t *
seek_file(void *baton, apr_off_t offset, apr_pool_t *scratch_pool)
{
  apr_file_t *file = (apr_file_t *)baton;
  SVN_ERR(svn_io_file_seek(file, APR_SET, &offset, scratch_pool));
  return SVN_NO_ERROR;
}

/* Write LEN bytes from BUF into the patched file content accessed
 * via BATON. Use SCRATCH_POOL for temporary allocations. */
static svn_error_t *
write_file(void *baton, const char *buf, apr_size_t len,
           apr_pool_t *scratch_pool)
{
  apr_file_t *file = (apr_file_t *)baton;
  SVN_ERR(svn_io_file_write_full(file, buf, len, &len, scratch_pool));
  return SVN_NO_ERROR;
}

/* Handling symbolic links:
 *
 * In Subversion, symlinks can be represented on disk in two distinct ways.
 * On systems which support symlinks, a symlink is created on disk.
 * On systems which do not support symlink, a file is created on disk
 * which contains the "normal form" of the symlink, which looks like:
 *   link TARGET
 * where TARGET is the file the symlink points to.
 *
 * When reading symlinks (i.e. the link itself, not the file the symlink
 * is pointing to) through the svn_subst_create_specialfile() function
 * into a buffer, the buffer always contains the "normal form" of the symlink.
 * Due to this representation symlinks always contain a single line of text.
 *
 * The functions below are needed to deal with the case where a patch
 * wants to change the TARGET that a symlink points to.
 */

/* Baton for the (readline|tell|seek|write)_symlink functions. */
struct symlink_baton_t
{
  /* The path to the symlink on disk (not the path to the target of the link) */
  const char *local_abspath;

  /* Indicates whether the "normal form" of the symlink has been read. */
  svn_boolean_t at_eof;
};

/* Allocate *STRINGBUF in RESULT_POOL, and store into it the "normal form"
 * of the symlink accessed via BATON.
 *
 * Otherwise behaves like readline_file(), which see.
 */
static svn_error_t *
readline_symlink(void *baton, svn_stringbuf_t **line, const char **eol_str,
                 svn_boolean_t *eof, apr_pool_t *result_pool,
                 apr_pool_t *scratch_pool)
{
  struct symlink_baton_t *sb = baton;

  if (eof)
    *eof = TRUE;
  if (eol_str)
    *eol_str = NULL;

  if (sb->at_eof)
    {
      *line = NULL;
    }
  else
    {
      svn_string_t *dest;

      SVN_ERR(svn_io_read_link(&dest, sb->local_abspath, scratch_pool));
      *line = svn_stringbuf_createf(result_pool, "link %s", dest->data);
      sb->at_eof = TRUE;
    }

  return SVN_NO_ERROR;
}

/* Set *OFFSET to 1 or 0 depending on whether the "normal form" of
 * the symlink has already been read. */
static svn_error_t *
tell_symlink(void *baton, apr_off_t *offset, apr_pool_t *scratch_pool)
{