re PR fortran/29053 (Consecutive STREAM I/O file positions mixed up)

2006-09-14  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR libgfortran/29053
	* io.h (gfc_unit): Add variable, strm_pos, to track
	STREAM I/O file position.
	* file_pos.c (st_rewind): Set strm_pos to beginning.
	* open.c (new_unit): Initialize strm_pos.
	* read.c (read_x): Bump strm_pos.
	* inquire.c (inquire_via_unit): Return strm_pos value.
	* transfer.c (read_block),(read_block_direct),(write_block)
	(write_buf): Seek to strm_pos - 1.  Update strm_pos when done.
	(pre_position): Initialize strm_pos.
	(data_transfer_init): Set strm_pos if DT_HAS_REC.
	(finalize_transfer): Flush file, no need to update strm_pos.

From-SVN: r116970

libgfortran/ChangeLog

@@ -1,3 +1,18 @@
+2006-09-14  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
+
+	PR libgfortran/29053
+	* io.h (gfc_unit): Add variable, strm_pos, to track
+	STREAM I/O file position.
+	* file_pos.c (st_rewind): Set strm_pos to beginning.
+	* open.c (new_unit): Initialize strm_pos.
+	* read.c (read_x): Bump strm_pos.
+	* inquire.c (inquire_via_unit): Return strm_pos value.
+	* transfer.c (read_block),(read_block_direct),(write_block)
+	(write_buf): Seek to strm_pos - 1.  Update strm_pos when done.
+	(pre_position): Initialize strm_pos.
+	(data_transfer_init): Set strm_pos if DT_HAS_REC.
+	(finalize_transfer): Flush file, no need to update strm_pos.
+
 2006-09-10  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR libfortran/28947

libgfortran/io/file_pos.c

@@ -312,6 +312,7 @@ st_rewind (st_parameter_filepos *fpp)
 	  u->endfile = NO_ENDFILE;
 	  u->current_record = 0;
 	  u->bytes_left = 0;
+	  u->strm_pos = 1;
 	  u->read_bad = 0;
 	  test_endfile (u);
 	}

libgfortran/io/inquire.c

@@ -149,7 +149,7 @@ inquire_via_unit (st_parameter_inquire *iqp, gfc_unit * u)
     *iqp->recl_out = (u != NULL) ? u->recl : 0;
 
   if ((cf & IOPARM_INQUIRE_HAS_STRM_POS_OUT) != 0)
-    *iqp->strm_pos_out = (u != NULL) ? u->last_record : 0;
+    *iqp->strm_pos_out = (u != NULL) ? u->strm_pos : 0;
 
   if ((cf & IOPARM_INQUIRE_HAS_NEXTREC) != 0)
     *iqp->nextrec = (u != NULL) ? u->last_record + 1 : 0;

libgfortran/io/io.h

@@ -498,8 +498,9 @@ typedef struct gfc_unit
   /* recl           -- Record length of the file.
      last_record    -- Last record number read or written
      maxrec         -- Maximum record number in a direct access file
-     bytes_left     -- Bytes left in current record.  */
+     bytes_left     -- Bytes left in current record.
-  gfc_offset recl, last_record, maxrec, bytes_left;
+     strm_pos       -- Current position in file for STREAM I/O.  */
+  gfc_offset recl, last_record, maxrec, bytes_left, strm_pos;
 
   __gthread_mutex_t lock;
   /* Number of threads waiting to acquire this unit's lock.

libgfortran/io/open.c

@@ -440,7 +440,7 @@ new_unit (st_parameter_open *opp, gfc_unit *u, unit_flags * flags)
     {
       u->maxrec = max_offset;
       u->recl = 1;
-      u->last_record = 1;
+      u->strm_pos = 1;
     }
 
   memmove (u->file, opp->file, opp->file_len);

libgfortran/io/read.c

@@ -853,5 +853,5 @@ read_x (st_parameter_dt *dtp, int n)
       dtp->u.p.sf_read_comma = 1;
     }
   else
-    dtp->rec += (GFC_IO_INT) n;
+    dtp->u.p.current_unit->strm_pos += (gfc_offset) n;
 }

libgfortran/io/transfer.c

@@ -318,7 +318,7 @@ read_block (st_parameter_dt *dtp, int *length)
   else
     {
       if (sseek (dtp->u.p.current_unit->s,
-		 (gfc_offset) (dtp->rec - 1)) == FAILURE)
+		 dtp->u.p.current_unit->strm_pos - 1) == FAILURE)
 	{
 	  generate_error (&dtp->common, ERROR_END, NULL);
 	  return NULL;
@@ -341,7 +341,7 @@ read_block (st_parameter_dt *dtp, int *length)
 	    }
 	}
 
-      dtp->rec += (GFC_IO_INT) nread;
+      dtp->u.p.current_unit->strm_pos += (gfc_offset) nread;
     }
   return source;
 }
@@ -400,7 +400,7 @@ read_block_direct (st_parameter_dt *dtp, void *buf, size_t *nbytes)
   else
     {
       if (sseek (dtp->u.p.current_unit->s,
-	  (gfc_offset) (dtp->rec - 1)) == FAILURE)
+		 dtp->u.p.current_unit->strm_pos - 1) == FAILURE)
 	{
 	  generate_error (&dtp->common, ERROR_END, NULL);
 	  return;
@@ -420,7 +420,7 @@ read_block_direct (st_parameter_dt *dtp, void *buf, size_t *nbytes)
 	dtp->u.p.size_used += (gfc_offset) nread;
     }
   else
-    dtp->rec += (GFC_IO_INT) nread; 
+    dtp->u.p.current_unit->strm_pos += (gfc_offset) nread; 
 
   if (nread != *nbytes)  /* Short read, e.g. if we hit EOF.  */
     {
@@ -479,9 +479,9 @@ write_block (st_parameter_dt *dtp, int length)
   else
     {
       if (sseek (dtp->u.p.current_unit->s,
-	  (gfc_offset) (dtp->rec - 1)) == FAILURE)
+		 dtp->u.p.current_unit->strm_pos - 1) == FAILURE)
 	{
-	  generate_error (&dtp->common, ERROR_END, NULL);
+	  generate_error (&dtp->common, ERROR_OS, NULL);
 	  return NULL;
 	}
 
@@ -493,7 +493,7 @@ write_block (st_parameter_dt *dtp, int length)
 	  return NULL;
 	}
 
-      dtp->rec += (GFC_IO_INT) length;
+      dtp->u.p.current_unit->strm_pos += (gfc_offset) length;
     }
 
   return dest;
@@ -531,7 +531,7 @@ write_buf (st_parameter_dt *dtp, void *buf, size_t nbytes)
   else
     {
       if (sseek (dtp->u.p.current_unit->s,
-		 (gfc_offset) (dtp->rec - 1)) == FAILURE)
+		 dtp->u.p.current_unit->strm_pos - 1) == FAILURE)
 	{
 	  generate_error (&dtp->common, ERROR_OS, NULL);
 	  return FAILURE;
@@ -550,7 +550,7 @@ write_buf (st_parameter_dt *dtp, void *buf, size_t nbytes)
 	dtp->u.p.size_used += (gfc_offset) nbytes;
     }
   else
-    dtp->rec += (GFC_IO_INT) nbytes; 
+    dtp->u.p.current_unit->strm_pos += (gfc_offset) nbytes; 
 
   return SUCCESS;
 }
@@ -1506,7 +1506,7 @@ pre_position (st_parameter_dt *dtp)
       /* There are no records with stream I/O.  Set the default position
 	 to the beginning of the file if no position was specified.  */
       if ((dtp->common.flags & IOPARM_DT_HAS_REC) == 0)
-        dtp->rec = 1;
+        dtp->u.p.current_unit->strm_pos = 1;
       break;
     
     case UNFORMATTED_SEQUENTIAL:
@@ -1766,6 +1766,8 @@ data_transfer_init (st_parameter_dt *dtp, int read_flag)
 	}
 
       /* Position the file.  */
+      if (!is_stream_io (dtp))
+	{
 	  if (sseek (dtp->u.p.current_unit->s, (gfc_offset) (dtp->rec - 1)
 		     * dtp->u.p.current_unit->recl) == FAILURE)
 	    {
@@ -1773,6 +1775,10 @@ data_transfer_init (st_parameter_dt *dtp, int read_flag)
 	      return;
 	    }
 	}
+      else
+	dtp->u.p.current_unit->strm_pos = dtp->rec;
+
+    }
 
   /* Overwriting an existing sequential file ?
      it is always safe to truncate the file on the first write */
@@ -2367,10 +2373,7 @@ finalize_transfer (st_parameter_dt *dtp)
       next_record (dtp, 1);
     }
   else
-    {
     flush (dtp->u.p.current_unit->s);
-      dtp->u.p.current_unit->last_record = dtp->rec;
-    }
 
   sfree (dtp->u.p.current_unit->s);
 }