* Sebastian Hammer, Adam Dickmeiss
*
* $Log: rstemp.c,v $
- * Revision 1.2 1995-09-04 09:10:56 adam
+ * Revision 1.5 1995-09-05 16:36:59 adam
+ * Minor changes.
+ *
+ * Revision 1.4 1995/09/05 11:43:24 adam
+ * Complete version of temporary sets. Not tested yet though.
+ *
+ * Revision 1.3 1995/09/04 15:20:40 adam
+ * More work on temp sets. is_open member removed.
+ *
+ * Revision 1.2 1995/09/04 09:10:56 adam
* Minor changes.
*
* Revision 1.1 1994/11/04 13:21:30 quinn
*
*/
+#include <fcntl.h>
+#include <assert.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <stdio.h>
+
+#include <alexutil.h>
#include <rstemp.h>
static struct rset_control *r_create(const struct rset_control *sel,
static void r_delete(struct rset_control *ct);
static void r_rewind(struct rset_control *ct);
static int r_count(struct rset_control *ct);
-static int r_read();
-static int r_write();
+static int r_read (rset_control *ct, void *buf);
+static int r_write (rset_control *ct, const void *buf);
static const rset_control control =
{
const rset_control *rset_kind_temp = &control;
-static struct rset_control *r_create(const struct rset_control *sel, void *parms)
-{}
+struct rset_temp_private {
+ int fd;
+ char *fname;
+ size_t key_size;
+ char *buf_mem;
+ size_t buf_size;
+ size_t pos_end;
+ size_t pos_cur;
+ size_t pos_buf;
+ size_t pos_border;
+ int dirty;
+};
+
+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_private *info;
+
+ logf (LOG_DEBUG, "ritemp_create(%s)", sel->desc);
+ newct = xmalloc(sizeof(*newct));
+ memcpy(newct, sel, sizeof(*sel));
+ newct->buf = xmalloc (sizeof(struct rset_temp_private));
+ 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 int r_open(struct rset_control *ct, int wflag)
-{}
+{
+ struct rset_temp_private *info = ct->buf;
+
+ 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 && 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(struct rset_control *ct)
-{}
+static void r_close (struct rset_control *ct)
+{
+ struct rset_temp_private *info = ct->buf;
+
+ r_flush (ct, 0);
+ if (info->fname && info->fd != -1)
+ {
+ close (info->fd);
+ info->fd = -1;
+ }
+}
-static void r_delete(struct rset_control *ct)
-{}
+static void r_delete (struct rset_control *ct)
+{
+ struct rset_temp_private *info = ct->buf;
-static void r_rewind(struct rset_control *ct)
-{}
+ 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;
-static int r_count(struct rset_control *ct)
-{}
+ r_flush (ct, 0);
+ info->pos_cur = 0;
+ info->pos_buf = 0;
+ r_reread (ct);
+}
+
+static int r_count (struct rset_control *ct)
+{
+ struct rset_temp_private *info = ct->buf;
+
+ return info->pos_end / info->key_size;
+}
+
+static int r_read (rset_control *ct, void *buf)
+{
+ struct rset_temp_private *info = ct->buf;
+ size_t nc = info->pos_cur + info->key_size;
+
+ if (nc > info->pos_border)
+ {
+ if (nc > info->pos_end)
+ return 0;
+ r_flush (ct, 0);
+ info->pos_buf = info->pos_cur;
+ r_reread (ct);
+ }
+ memcpy (buf, info->buf_mem + (info->pos_cur - info->pos_buf),
+ info->key_size);
+ info->pos_cur = nc;
+ return 1;
+}
+
+static int r_write (rset_control *ct, const void *buf)
+{
+ struct rset_temp_private *info = ct->buf;
+ size_t nc = info->pos_cur + info->key_size;
-static int r_read()
-{}
+ if (nc > info->pos_buf + info->buf_size)
+ {
+ r_flush (ct, 1);
+ info->pos_buf = info->pos_cur;
+ r_reread (ct);
+ }
+ memcpy (info->buf_mem + (info->pos_cur - info->pos_buf), buf,
+ info->key_size);
+ info->dirty = 1;
+ info->pos_border = info->pos_cur = nc;
+ return 1;
+}
-static int r_write()
-{}
projects / idzebra-moved-to-github.git / blobdiff