Initial import of the CDE 2.1.30 sources from the Open Group.

cde/lib/DtSearch/raima/recnext.c

@@ -0,0 +1,106 @@
+/* $XConsortium: recnext.c /main/2 1996/05/09 04:14:47 drk $ */
+/*
+ *   COMPONENT_NAME: austext
+ *
+ *   FUNCTIONS: d_recnext
+ *
+ *   ORIGINS: 157
+ *
+ *   OBJECT CODE ONLY SOURCE MATERIALS
+ */
+
+/* ********************** EDIT HISTORY *******************************
+
+ SCR    DATE    INI                   DESCRIPTION
+----- --------- --- -----------------------------------------------------
+  101 21-Jun-88 RSC Use rn_type and rn_dba instead of curr_rec
+  103 24-Jun-88 RSC Improve generation of single user version
+      04-Aug-88 RTK MULTI_TASK changes
+      18-Aug-88 RSC moved rn_type/dba to separate table
+
+*/
+
+#include <stdio.h>
+#include "vista.h"
+#include "dbtype.h"
+
+
+/* Find next record of type
+*/
+d_recnext(TASK_DBN_ONLY)
+TASK_DECL
+DBN_DECL
+{
+   INT rectype;
+   FILE_NO fno;
+   FILE_NO ft;
+   DB_ADDR dba;
+#ifndef SINGLE_USER
+   int dbopen_sv;
+#endif
+   int rec_ndx;			/* Index into record table */
+   RECORD_ENTRY FAR *rec_ptr;	/* Pointer to record table */
+   char FAR *recptr;
+   F_ADDR rno, last;
+
+   DB_ENTER(DB_ID TASK_ID LOCK_SET(RECORD_IO));
+
+   /* look for the current record type */
+   if ( RN_REF(rn_type) < 0 ) RETURN( dberr(S_NOTYPE) );
+
+   /* get the record number and file number from the current record */
+   if (RN_REF(rn_dba)) {
+      fno = (FILE_NO)((RN_REF(rn_dba) >> FILESHIFT) & FILEMASK);
+      rno = RN_REF(rn_dba) & ADDRMASK;
+   }
+   else {			/* No current rec - get fno from rn_type */
+      nrec_check(RN_REF(rn_type) + RECMARK, &rec_ndx, (RECORD_ENTRY FAR * FAR *)&rec_ptr);
+      fno = (FILE_NO)NUM2EXT(rec_ptr->rt_file, ft_offset);
+      fno = (int)((fno >> FILESHIFT) & FILEMASK);
+      rno = 1;
+   }
+   ft = NUM2INT( fno, ft_offset );
+
+   /* start looking at the next record number */
+   if ( (last = dio_pznext(ft)) <= 0 )
+      RETURN( db_status );
+
+   ++rno;
+   do {
+	/* make sure we haven't gone past the end of the file */
+	if ( rno >= last ) RETURN( db_status = S_NOTFOUND );
+
+	/* create the database address to read */
+	dba = ( (FILEMASK & fno) << FILESHIFT ) | (ADDRMASK & rno);
+
+	/* set up to allow unlocked read */
+#ifndef SINGLE_USER
+	dbopen_sv = dbopen;
+	dbopen = 2;
+#endif
+
+	/* read the record */
+	dio_read( dba, (char FAR * FAR *)&recptr, NOPGHOLD );
+#ifndef SINGLE_USER
+	dbopen = dbopen_sv;
+#endif
+	if ( db_status != S_OKAY )
+	    RETURN( db_status );
+
+	/* get the record type out of the record */
+	bytecpy( &rectype, recptr, sizeof(INT) );
+#ifndef SINGLE_USER
+	rectype &= ~RLBMASK;
+#endif
+
+	++rno;
+   } while ( rectype != RN_REF(rn_type) );
+
+   /* set the current record */
+   curr_rec = dba;
+   RN_REF(rn_type) = rectype;
+   RN_REF(rn_dba)  = dba;
+
+   RETURN( db_status = S_OKAY );
+}
+/* vpp -nOS2 -dUNIX -nBSD -nVANILLA_BSD -nVMS -nMEMLOCK -nWINDOWS -nFAR_ALLOC -f/usr/users/master/config/nonwin recnext.c */