cpm commands

WEGA/contrib/cpm/cpm3/blk_no_hdl.c

@@ -0,0 +1,143 @@
+/*
+ *	blk_no_hdl.c
+ *	Behandlung der im Directory enthaltenen Blocknummern
+ *	es werden zur Zeit 2 verschiedene Addressformate unterstuetzt
+ */
+
+#include <stdio.h>
+#include "cpmio.h"
+#include "cpmfio.h"
+
+extern int flp_fmt;
+
+
+/*
+ *	getblno
+ *	bereitstellen der naechsten Blocknummer aus dem Directory
+ */
+getblno( fptr )
+	C_FILE *fptr;
+{
+	int blockno;
+	int *blp;
+
+	if( fptr->c_blk == 16 )
+		return( EOF );
+	switch( flp_fmt ) {
+	case 1:	/* 8 bit Blockaddressen */
+		blockno = fptr->c_dirp->pointers[ fptr->c_blk++ ] &0xff;
+		break;
+	case 2:	/* 16 bit Blockaddressen */
+		blp = ( int * )&(fptr->c_dirp->pointers[ fptr->c_blk ] );
+		fptr->c_blk += 2;
+#ifdef p8000
+		blockno = *blp;
+		blockno = numswab( blockno );
+#else
+		blockno = *blp;
+#endif p8000
+		break;
+	default:
+		fprintf( stderr, "getblno: unknown addressformat %d\n",
+		flp_fmt );
+		exit( 1 );
+		break;
+	}
+#ifdef DEBUG
+	fprintf( stderr, "getblno: block = %d\n", blockno );
+#endif
+	return( blockno );
+}
+
+/*
+ *	putblno
+ *	eintragen der naechsten Blocknummer in das Verzeichniss
+ */
+putblno( fptr, block )
+	C_FILE *fptr;
+	int block;
+{
+	int *blp;
+
+	if( fptr->c_blk == 16 )
+		return( EOF );
+	switch( flp_fmt ) {
+	case 1:	/* 8 Bit Blockaddressen */
+		fptr->c_dirp->pointers[ fptr->c_blk ] = block & 0xff;
+		fptr->c_blk++;
+		break;
+	case 2:	/* 16 Bit Blockaddressen */
+		blp = ( int * )&(fptr->c_dirp->pointers[ fptr->c_blk ] );
+#ifdef p8000
+		*blp = numswab( block );
+#else
+		*blp = block;
+#endif p8000
+		fptr->c_blk += 2;
+		break;
+	default:
+		fprintf( stderr, "putblno: unknown addressformat %d\n",
+		flp_fmt );
+		exit( 1 );
+		break;
+	}
+#ifdef DEBUG
+	fprintf( stderr, "putblno: block = %d\n", block );
+#endif
+	return( block );
+}
+
+/*
+ *	extblno
+ *	liefert blocknummern fuer build_bmap
+ */
+
+extblno( pointer, ind )
+	char pointer[];
+	int ind;
+{
+	int *blp;
+	int blk;
+
+	switch( flp_fmt ) {
+	case 1:
+		return( pointer[ind] & 0xff );
+		break;
+	case 2:
+		blp = ( int * )&pointer[ind];
+#ifdef p8000
+		blk = *blp;
+		blk = numswab( blk );
+#ifdef DEBUG
+		fprintf( stderr, "extblno: block = %d\n", blk );
+#endif DEBUG
+		return(  blk );
+#else
+#ifdef DEBUG
+		fprintf( stderr, "extblno: block = %d\n", blk );
+#endif DEBUG
+		return( *blp );
+#endif p8000
+		break;
+	default:
+		fprintf( stderr, "extblno: unknown addressformat %d\n",
+		flp_fmt );
+		exit( 1 );
+		break;
+	}
+}	
+
+#ifdef p8000
+numswab( in )
+	int in;
+{
+	char *ip, *op;
+	int out;
+
+	ip = ( char * ) &in;
+	op = ( char * ) &out;
+	op[1] = ip[0] & 0xff;
+	op[0] = ip[1] & 0xff;
+	return( out );
+}
+#endif p8000

WEGA/contrib/cpm/cpm3/cfillbuf.c

@@ -0,0 +1,32 @@
+/*	cfillbuf.c	1.6	83/05/13	*/
+#include <stdio.h>
+#include "cpmio.h"
+#include "cpmfio.h"
+
+c_fillbuf(fptr)
+	register C_FILE *fptr;
+{
+
+	int	getnext(), nsect;
+	int	block;
+
+	if ( ( block = getblno( fptr ) )  == EOF )
+		if (fptr->c_dirp->blkcnt ==  (char) 0x80) {
+			/* find next extent (if it exists) */
+			if (getnext(fptr) == NULL)
+				return (EOF);
+			if ((block = getblno(fptr)) == EOF)
+				return(EOF);	/* Hahn */
+		}
+		else 
+			return (EOF);
+	nsect = (fptr->c_seccnt>blksiz/128) ? blksiz/128 : fptr->c_seccnt;
+	if (nsect == 0) 
+		return (EOF);
+	fptr->c_seccnt -= nsect;
+	if (getblock( block, fptr->c_base, nsect) == EOF)
+		return (EOF);
+	fptr->c_buf = fptr->c_base;
+	fptr->c_cnt = nsect*128 -1;
+	return (*fptr->c_buf++&0xff);
+}