+struct rset_temp_info {
+ int fd;
+ char *fname;
+ size_t key_size; /* key size */
+ char *buf_mem; /* window buffer */
+ size_t buf_size; /* size of window */
+ size_t pos_end; /* last position in set */
+ size_t pos_cur; /* current position in set */
+ size_t pos_buf; /* position of first byte in window */
+ size_t pos_border; /* position of last byte+1 in window */
+ int dirty; /* window is dirty */
+};
+
+struct rset_temp_rfd {
+ struct rset_temp_info *info;
+ struct rset_temp_rfd *next;
+};
+
+static struct rset_control *r_create(const struct rset_control *sel,
+ void *parms)
+{
+ rset_control *newct;
+ rset_temp_parms *temp_parms = parms;
+ struct rset_temp_info *info;
+
+ newct = xmalloc(sizeof(*newct));
+ memcpy(newct, sel, sizeof(*sel));
+ newct->buf = xmalloc (sizeof(struct rset_temp_info));
+ info = newct->buf;
+
+ info->fd = -1;
+ info->fname = NULL;
+ info->key_size = temp_parms->key_size;
+ info->buf_size = 1024;
+ info->buf_mem = xmalloc (info->buf_size);
+ info->pos_cur = 0;
+ info->pos_end = 0;
+ info->pos_buf = 0;
+ info->dirty = 0;
+
+ return newct;
+}
+
+static RSFD r_open (struct rset_control *ct, int wflag)
+{
+ struct rset_temp_info *info = ct->buf;
+ struct rset_temp_rfd *rfd;
+
+ 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);
+ }
+ }
+ rfd = xmalloc (sizeof(*rfd));
+ rfd->info = info;
+ r_rewind (ct);
+ return rfd;
+}
+
+/* r_flush:
+ flush current window to file if file is assocated with set
+ */
+static void r_flush (RSFD rfd, int mk)
+{
+ struct rset_temp_info *info = ((struct rset_temp_rfd*) rfd)->info;
+
+ 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 && info->fd != -1 && 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 (RSFD rfd)
+{
+ struct rset_temp_info *info = ((struct rset_temp_rfd*)rfd)->info;
+
+ r_flush (rfd, 0);
+ if (info->fname && info->fd != -1)
+ {
+ close (info->fd);
+ info->fd = -1;
+ }
+}
+
+static void r_delete (struct rset_control *ct)
+{
+ struct rset_temp_info *info = ct->buf;
+
+ if (info->fname)
+ unlink (info->fname);
+ free (info->buf_mem);
+ free (info->fname);
+ free (info);
+}
+
+/* r_reread:
+ read from file to window if file is assocated with set -
+ indicated by fname
+ */
+static void r_reread (RSFD rfd)
+{
+ struct rset_temp_info *info = ((struct rset_temp_rfd*)rfd)->info;
+
+ 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;
+}