+
+ assert (info->fd == -1);
+ if (info->fname)
+ {
+ if (wflag)
+ info->fd = open (info->fname, O_RDWR|O_CREAT, 0666);
+ else
+ info->fd = open (info->fname, O_RDONLY);
+ if (info->fd == -1)
+ {
+ logf (LOG_FATAL|LOG_ERRNO, "open %s", info->fname);
+ exit (1);
+ }
+ }
+ r_rewind (ct);
+ return 0;
+}
+
+static void r_flush (struct rset_control *ct, int mk)
+{
+ struct rset_temp_private *info = ct->buf;
+
+ if (!info->fname && mk)
+ {
+ char *s = (char*) tempnam (NULL, "zrs");
+
+ info->fname = xmalloc (strlen(s)+1);
+ strcpy (info->fname, s);
+
+ info->fd = open (info->fname, O_RDWR|O_CREAT, 0666);
+ if (info->fd == -1)
+ {
+ logf (LOG_FATAL|LOG_ERRNO, "open %s", info->fname);
+ exit (1);
+ }
+ }
+ if (info->fname)
+ {
+ assert (info->fd != -1);
+ if (info->dirty)
+ {
+ size_t r, count;
+
+ if (lseek (info->fd, info->pos_buf, SEEK_SET) == -1)
+ {
+ logf (LOG_FATAL|LOG_ERRNO, "lseek %s", info->fname);
+ exit (1);
+ }
+ count = info->buf_size;
+ if (count > info->pos_end - info->pos_buf)
+ count = info->pos_end - info->pos_buf;
+ if ((r = write (info->fd, info->buf_mem, count)) < count)
+ {
+ if (r == -1)
+ logf (LOG_FATAL|LOG_ERRNO, "read %s", info->fname);
+ else
+ logf (LOG_FATAL, "write of %ld but got %ld",
+ (long) count, (long) r);
+ exit (1);
+ }
+ info->dirty = 0;
+ }
+ }
+}
+
+static void r_close (struct rset_control *ct)
+{
+ struct rset_temp_private *info = ct->buf;
+
+ r_flush (ct, 0);
+ if (info->fname)
+ {
+ assert (info->fd != -1);
+ close (info->fd);
+ info->fd = -1;
+ }
+}
+
+static void r_delete (struct rset_control *ct)
+{
+ struct rset_temp_private *info = ct->buf;
+
+ r_close (ct);
+ if (info->fname)
+ unlink (info->fname);
+ free (info->buf_mem);
+ free (info->fname);
+ free (info);
+}
+
+static void r_reread (struct rset_control *ct)
+{
+ struct rset_temp_private *info = ct->buf;
+
+ if (info->fname)
+ {
+ size_t r, count;
+
+ info->pos_border = info->pos_cur + info->buf_size;
+ if (info->pos_border > info->pos_end)
+ info->pos_border = info->pos_end;
+ count = info->pos_border - info->pos_buf;
+ if (count > 0)
+ if ((r = read (info->fd, info->buf_mem, count)) < count)
+ {
+ if (r == -1)
+ logf (LOG_FATAL|LOG_ERRNO, "read %s", info->fname);
+ else
+ logf (LOG_FATAL, "read of %ld but got %ld",
+ (long) count, (long) r);
+ exit (1);
+ }
+ }
+ else
+ info->pos_border = info->pos_end;
+}
+
+static void r_rewind (struct rset_control *ct)
+{
+ struct rset_temp_private *info = ct->buf;
+
+ r_flush (ct, 0);