Upload

Digital Research

CPM OPERATING SYSTEMS/CPM 68K/1.0X SOURCES/v102a/clib/chinit.c

@@ -0,0 +1,53 @@
+/*****************************************************************************
+*
+*		     C C B   I N I T I A L I Z A T I O N
+*		     -----------------------------------
+*	Copyright 1982 by Digital Research Inc.  All rights reserved.
+*
+*	Routine "_chinit" is called from the run-time initialization to clear
+*	out all the CCB storage.
+*	Calling sequence:
+*		_chinit();
+*
+*	Routine "__chinit(fd)" is called from other low-level routines
+*	for single channel initialization.
+*	Calling sequence:
+*		__chinit(fd)
+*	where:	fd = file descriptor #
+*
+*****************************************************************************/
+#include	<portab.h>			/* Include std definitions  */
+#include	<cpm.h>				/* Include CP/M definitions */
+
+FD		 _fds[MAXCCBS];			/* Allocate CCB storage	    */
+
+_chinit()					/****************************/
+{						/*			    */
+	REG WORD	i;			/*	Index		    */
+	for(i=0;i<MAXCCBS;i++)			/*	For all channels    */
+		__chinit(i);			/*	Init fds(i);	    */
+}						/****************************/
+
+/*****************************************************************************
+*	The __chinit routine initializes only 1 channel.
+*****************************************************************************/
+
+__chinit(i)
+{						/****************************/
+	REG FD 		*ch;			/* -> CCB		    */
+	REG BYTE	*p;			/* Byte pointer temporary   */
+
+	ch =  _getccb(i);			/* convert fd to CCB	    */
+	ch -> chan   = i;			/* Load channel byte	    */
+	ch -> flags  = 0;			/* clear flag word	    */
+	ch -> sector = -1;			/* Set no sector in buff    */
+	ch -> offset = 0;			/* Clear file offset word   */
+	ch -> hiwater = 0;			/* Init hiwater mark	    */
+	ch -> fcb.drive = 0;			/* Init drive field of fcb  */
+	p = &ch->fcb.fname[0];			/* Set to file var	    */
+	while (p< &ch->fcb.ftype[3])		/* Init file name fields    */
+		*p++ = ' ';			/* To spaces		    */
+	while (p < &ch->fcb.record)		/* Init rest of fcb	    */
+		*p++ = 0;			/* To zeros		    */
+}						/****************************/
+