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https://github.com/open-simh/simtools.git
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bf7c17ab4a
file systems. It supports reading and writing as well as a number
of other operations, such as octal dump, file system initialize,
and file system check ("clean").
This was originally maintained as a Subversion repository at
svn://akdesign.dyndns.org/flx/branches/V2.6.
as suggested by Timothe Litt on the SIMH mailing list.
63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
/* handler for the "compress" command */
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#include <stdio.h>
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#include <string.h>
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#include "flx.h"
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#include "fldef.h"
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#include "docomp.h"
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#include "diskio.h"
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#include "fip.h"
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void docomp (int argc, char **argv) /* zero unused clusters */
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{
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byte *s;
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int bit, szb;
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long first, size, iosize;
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long n;
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rmountrw (); /* mount the disk R/W */
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memset (iobuf, 0, iobufsize); /* clear out I/O buffer */
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s = sattbufp;
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szb = (diskblocks - dcs) / pcs; /* satt bits actually used */
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bit = 1;
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n = 0; /* start looking at PCN = 0 */
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for (;;) {
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for ( ; n < szb; n++) { /* scan past allocated clusters */
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if (bit > 0x80) {
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bit = 1;
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s++;
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}
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if ((*s & bit) == 0) break;
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bit <<= 1;
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}
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if (n == szb) break;
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first = n;
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for ( ; n < szb; n++) { /* find length of free area */
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if (bit > 0x80) {
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bit = 1;
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s++;
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}
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if (*s & bit) break;
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bit <<= 1;
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}
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size = (n - first) * pcs;
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first = pcntolbn(first); /* get starting lbn */
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if (sw.verbose != NULL) {
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printf ("clearing %ld..%ld\015", first, first + size - 1);
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fflush (stdout);
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}
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for (;;) {
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iosize = size * BLKSIZE;
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if (iosize > iobufsize) iosize = iobufsize;
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rwrite (first, iosize, iobuf);
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size -= iobufsize / BLKSIZE;
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if (size <= 0) break;
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first += iobufsize / BLKSIZE;
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}
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}
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if (sw.verbose != NULL) printf ("\n");
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rumountrw (); /* done with the disk */
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}
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