cpm commands

WEGA/contrib/cpm/cpm3/cflsbuf.c

@@ -0,0 +1,87 @@
+/*	cflsbuf.c	1.10	83/05/13	*/
+
+#include <stdio.h>
+#include "cpmio.h"
+#include "cpmfio.h"
+
+/*
+ * Flush a full block to floppy disk file
+ * (these routines are never called unless a full block is
+ * to be written)
+ * Create a new extent if required
+ */
+
+extern int flp_fmt;
+
+c_flush(fptr)
+	register C_FILE *fptr;
+{
+
+	int	it; 
+	int	alloc();
+
+	if (!(fptr->c_flag & WRITE)) {
+		fprintf(stderr, "no write access");
+		return (EOF);
+	}
+	fptr->c_seccnt += blksiz/128;
+	fptr -> c_blk -= flp_fmt;
+	it = getblno( fptr );
+	if (putblock( it, fptr->c_base, -1) == EOF)
+		return (EOF);
+	if (fptr->c_blk == 16) {
+		fptr->c_dirp->blkcnt =  (char) 0x80;
+		savedir();
+		/* create lew extent */
+		if ((it = creext(fptr->c_ext)) == NULL) {
+			fprintf(stderr,"can't create new extent, current: %d\n",
+				fptr->c_ext);
+			return (EOF);
+		}
+		fptr->c_dirp = dirbuf+it;
+		fptr->c_ext  = it;
+		fptr->c_blk  = 0;
+		fptr->c_seccnt = 0;
+		fptr->c_extno++;
+		fptr->c_dirp->extno= fptr->c_extno;
+	}
+	fptr->c_buf = fptr->c_base;
+	fptr->c_cnt = blksiz;
+	it = alloc();
+	if( it == 0 ) {
+		fprintf(stderr, "disk full\n");
+		return (EOF);
+	}
+	putblno( fptr, it );
+	return (0);
+}
+
+c_flsbuf(c, fptr)
+	register C_FILE *fptr;
+{
+	if (c_flush(fptr) == EOF)
+		return (EOF);
+	*(fptr->c_buf++) = c;
+	fptr->c_cnt--;
+	return (c);
+}
+
+/*
+ * move the contents of 'buf' into the cpm block buffer,
+ * flush the buffer if full (for binary file transfers)
+ */
+
+c_write(fptr, buf, cnt)
+	register C_FILE *fptr;
+	char *buf;
+{
+	int i = cnt;
+
+	while (i-- > 0) {
+		*(fptr->c_buf++) = *(buf++);
+		if (--fptr->c_cnt == 0)
+			if (c_flush(fptr) == EOF)
+				return (EOF);
+	}
+	return (cnt);
+}