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monitor.c
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/* System monitor.
Copyright (C) 1995 Frank D. Cringle.
This file is part of yaze - yet another Z80 emulator.
Yaze is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* $Id: monitor.c,v 1.3 2004/01/11 16:49:58 fdc Exp $ */
#ifndef lint
static char vcid[] = "$Id: monitor.c,v 1.3 2004/01/11 16:49:58 fdc Exp $";
#endif /* lint */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#ifndef CLK_TCK
#define CLK_TCK CLOCKS_PER_SEC
#endif
#include <limits.h>
#include <fcntl.h>
#include <termios.h>
#include <ctype.h>
#include <signal.h>
#include <sys/times.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <sys/mman.h>
#include "simz80.h"
#include "yaze.h"
#include "bios.h"
/* TTY management */
struct termios cookedtio, rawtio;
int ttyflags;
int interrupt;
void
ttyraw(void)
{
if ((ttyflags & (ISATTY|ISRAW)) == ISATTY) {
tcsetattr(fileno(stdin), TCSAFLUSH, &rawtio);
ttyflags |= ISRAW;
}
}
void
ttycook(void)
{
if (ttyflags & ISRAW) {
tcsetattr(fileno(stdin), TCSAFLUSH, &cookedtio);
putc('\n', stdout);
ttyflags &= ~ISRAW;
}
}
/* memory management routines for disk descriptors
(we need to allocate chunks of cp/m ram for these) */
/* inefficient but robust bit-wise algorithm (we're not doing this all day) */
#define bytefree(x) (!(global_alv[(x-bios_top) >> 3] & \
(0x80 >> ((x-bios_top) & 7))))
static WORD
cpmalloc(WORD len)
{
WORD p = bios_top;
while (p < dptable - len)
if (!bytefree(p))
p++;
else {
int i;
for (i = 1; i < len; i++)
if (!bytefree(p + i))
break;
if (i == len) {
WORD p1 = p - bios_top;
while (len--) {
global_alv[p1>>3] |= (0x80 >> (p1&7));
p1++;
}
return p;
}
p += i;
}
return 0;
}
static void
cpmfree(WORD adr, WORD len)
{
WORD p = adr - bios_top;
while (len--) {
global_alv[p>>3] &= ~(0x80 >> (p&7));
p++;
}
}
/* Disk management */
/* There are two kinds of simulated disk:
a unix file containing an image of a cp/m disk and
a unix directory which is made to look like a cp/m disk on the fly */
#define MNT_ACTIVE 1
#define MNT_RDONLY 2
#define MNT_UNIXDIR 4
struct mnt mnttab[16], *curdisk; /* mount table (simulated drives A..P) */
/* display a mount table entry */
static void
showdisk(int disk, int verbose)
{
struct mnt *dp = mnttab + disk;
printf("%c: ", disk+'A');
if (!(dp->flags & MNT_ACTIVE)) {
puts("not mounted");
return;
}
printf(dp->flags & MNT_UNIXDIR ? "%s %s/\n": "%s %s\n",
dp->flags & MNT_RDONLY ? "r/o " : "r/w ", dp->filename);
if (!verbose)
return;
printf(" dph=%04X, xlt=%04X, dirbuf=%04X, dpb=%04X, csv=%04X, alv=%04X, spt=%04X\n",
dp->dph, GetWORD(dp->dph), GetWORD(dp->dph+8), GetWORD(dp->dph+10),
GetWORD(dp->dph+12), GetWORD(dp->dph+14), GetWORD(dp->dph+16));
printf(" bsh=%02X, blm=%02X, exm=%02X, dsm=%04X, drm=%04X, al=%04X, cks=%04X, off=%04X\n",
GetBYTE(dp->dph+18), GetBYTE(dp->dph+19), GetBYTE(dp->dph+20), GetWORD(dp->dph+21),
GetWORD(dp->dph+23), GetWORD(dp->dph+25), GetWORD(dp->dph+27), GetWORD(dp->dph+29));
}
/* unmount a disk */
static int
umount(int disk)
{
struct mnt *dp = mnttab + disk;
WORD xlt;
if (!(dp->flags & MNT_ACTIVE))
return 0;
if (dp->flags & MNT_UNIXDIR) {
int i;
clearfc(dp); /* clear the bios's file cache */
for (i = 0; i < dp->nfds; i++)
free(dp->fds[i].fullname);
free(dp->data);
free(dp->fds);
}
else if (munmap(dp->header, dp->isize) == -1 ||
close(dp->ifd) == -1)
perror(dp->filename);
dp->flags = 0;
free(dp->filename);
if ((xlt = GetWORD(dp->dph)) != 0)
cpmfree(xlt, GetWORD(dp->dph+16));
cpmfree(GetWORD(dp->dph+14), (GetWORD(dp->dph+16+5) >> 3) + 1);
return 0;
}
/* stash a string away on the heap */
char *
newstr(const char *str)
{
char *p = xmalloc(strlen(str) + 1);
(void) strcpy(p, str);
return p;
}
/* Decide if a unix file is eligible to be included as a cp/m file in a
simulated disk constructed from a unix directory. Return the filesize in
bytes if so, 0 if not. */
static off_t
cpmsize(const char *dirname, const char *filename, unsigned char *cpmname, char **unixname)
{
int i, fd;
const char *p = filename;
unsigned char *p1 = cpmname;
struct stat st;
char *path;
/* construct cpm filename, rejecting any that dont fit */
for (i = 0; i < 8; i++) {
if (*p == 0 || *p == '.')
break;
if (*p <= ' ' || *p >= '{' || strchr("=_:,;<>", *p))
return 0;
*p1++ = toupper(*p);
p++;
}
for (; i < 8; i++)
*p1++ = ' ';
if (*p) {
if (*p == '.')
p++;
else
return 0;
}
for (; i < 11; i++) {
if (*p == 0)
break;
if (*p <= ' ' || *p >= '{' || strchr(".=_:,;<>", *p))
return 0;
*p1++ = toupper(*p);
p++;
}
if (*p)
return 0;
for (; i < 11; i++)
*p1++ = ' ';
/* construct unix filename */
path = xmalloc(strlen(dirname) + strlen(filename) + 2);
sprintf(path, "%s/%s", dirname, filename);
/* check that file is readable, regular and non-empty */
if ((fd = open(path, O_RDONLY)) < 0) {
free(path);
return 0;
}
if (fstat(fd, &st) < 0) {
close(fd);
free(path);
return 0;
}
close (fd);
if (((st.st_mode & S_IFMT) != S_IFREG) || st.st_size == 0) {
free(path);
return 0;
}
*unixname = path;
return st.st_size;
}
/* mount a unix directory as a simulated cpm disk */
static int
mountdir(struct mnt *dp, const char *filename)
{
DIR *dirp;
struct dirent *direntp;
unsigned char *cpmdir = xmalloc(N_ENTRIES*32);
unsigned long blockno = COVER((N_ENTRIES*32), BLOCK_SIZE);
int direno = 0;
int nfiles = 0;
WORD alv;
static unsigned long serialno = 0;
dp->fds = xmalloc(N_ENTRIES*sizeof(struct fdesc));
if ((dirp = opendir(filename)) == NULL) {
perror(filename);
free(cpmdir);
free(dp->fds);
return 0;
}
while ((direntp = readdir(dirp)) != NULL) {
char *fullname;
off_t size; /* file size in bytes */
int ndirents; /* number of directory entries required for file */
int nlogexts; /* number of full logical extents occupied by */
/* file */
int i;
unsigned long nblocks; /* number of blocks occupied by file */
if ((size = cpmsize(filename, direntp->d_name, cpmdir+32*direno+1,
&fullname)) == 0)
continue;
for (i = 0; i < direno; i++)
if (memcmp(cpmdir+32*i+1, cpmdir+32*direno+1, 11) == 0) {
free(fullname); /* discard case-collapsed duplicates */
continue;
}
ndirents = COVER(size, 8*BLOCK_SIZE);
nlogexts = size/(16*1024);
nblocks = COVER(size, BLOCK_SIZE);
if ((direno + ndirents > N_ENTRIES) ||
((blockno + nblocks) * BLOCK_SIZE > 0xffff * 128)) {
fprintf(stderr, "not all files in %s will fit on disk\n", filename);
free(fullname);
break;
}
dp->fds[nfiles].fullname = fullname;
dp->fds[nfiles].firstblock = blockno;
dp->fds[nfiles].lastblock = blockno + nblocks - 1;
dp->fds[nfiles++].serial = serialno++;
for (i = 0; i < ndirents; i++) {
unsigned char *cp = cpmdir + (direno+i)*32;
int ex = nlogexts < 2*i+1 ? nlogexts : 2*i+1;
int j;
*cp = 0;
if (i)
memcpy(cp+1, cpmdir+direno*32+1, 11);
cp[12] = ex & 0x1f;
cp[13] = 0;
cp[14] = ex >> 5;
cp[15] = nblocks <= 8 ?
COVER((size-16*1024*nlogexts), 128) : 128;
cp += 16;
for (j = 0; j < 8; j++) {
if (nblocks > 0) {
*cp++ = blockno;
*cp++ = blockno >> 8;
++blockno;
--nblocks;
}
else {
*cp++ = 0;
*cp++ = 0;
}
}
}
direno += ndirents;
}
closedir(dirp);
if (nfiles == 0) {
fprintf(stderr, "no suitable files in %s\n", filename);
free(cpmdir);
free(dp->fds);
return 0;
}
dp->nde = direno;
while (direno & 3) {
memset(cpmdir+direno*32, 0xe5, 32);
++direno;
}
dp->nfds = nfiles;
dp->fds = realloc(dp->fds, nfiles*sizeof(struct fdesc));
dp->data = realloc(cpmdir, direno*32);
/* set up disk parameter header */
dp->dph = dptable + (16+15)*(dp-mnttab);
memclr(ram + dp->dph, 16+15);
PutWORD(dp->dph+8, dirbuff); /* pointer to directory buffer */
PutWORD(dp->dph+10, dp->dph+16); /* pointer to dpb */
PutWORD(dp->dph+16, 256); /* sectors per track */
PutBYTE(dp->dph+18, 5); /* block shift factor */
PutBYTE(dp->dph+19, 31); /* block mask */
PutBYTE(dp->dph+20, 1); /* extent mask */
PutWORD(dp->dph+21, blockno > 256 ? blockno-1 : 256); /* DSM */
PutWORD(dp->dph+23, N_ENTRIES-1); /* DRM */
PutWORD(dp->dph+25, 0xffff); /* AL0,AL1 */
alv = cpmalloc((GetWORD(dp->dph+16+5) >> 3) + 1);
if (alv == 0) {
int i;
fprintf(stderr, "insufficient space to mount %s\n", filename);
for (i = 0; i < dp->nfds; i++)
free(dp->fds->fullname);
free(dp->data);
free(dp->fds);
return 0;
}
PutWORD(dp->dph+14, alv); /* pointer to allocation vector */
dp->filename = newstr(filename);
dp->flags = MNT_ACTIVE|MNT_RDONLY|MNT_UNIXDIR;
return 1;
}
static struct {
char magic[32];
char dpb[15];
} sssd = {
"<CPM_Disk> Drive x",
"\x1a\x00\x03\x07\x00\xf2\x00\x3f\x00\xc0\x00\x00\x00\x02\x00"
};
static char *xlt26 =
"\x00\x06\x0c\x12\x18\x04\x0a\x10\x16\x02\x08\x0e\x14"
"\x01\x07\x0d\x13\x19\x05\x0b\x11\x17\x03\x09\x0f\x15";
static int
mount(int disk, const char *filename, int readonly)
{
struct mnt *dp = mnttab + disk;
int prot = PROT_READ|PROT_WRITE;
int doffs;
WORD alv;
BYTE buf[128];
struct stat st;
if (dp->flags & MNT_ACTIVE)
umount(disk);
dp->flags = 0;
if (stat(filename, &st) < 0) {
perror(filename);
return 0;
}
if ((st.st_mode & S_IFMT) == S_IFDIR)
return mountdir(dp, filename);
if ((st.st_mode & S_IFMT) != S_IFREG) {
fprintf(stderr, "%s is neither a regular file nor a directory\n", filename);
return 0;
}
if (readonly || (dp->ifd = open(filename, O_RDWR)) < 0) {
prot = PROT_READ;
dp->flags |= MNT_RDONLY;
if ((dp->ifd = open(filename, O_RDONLY)) < 0) {
perror(filename);
return 0;
}
}
/* peek at descriptor page */
if (read(dp->ifd, buf, 128) != 128) {
perror(filename);
close(dp->ifd);
return 0;
}
if (memcmp(buf, "<CPM_Disk>", 10) != 0) {
WORD xlt;
if (st.st_size != 256256) {
fprintf(stderr, "%s is not a valid <CPM_Disk> file\n", filename);
close(dp->ifd);
return 0;
}
/* assume this is an image of a sssd floppy */
memcpy(buf, &sssd, sizeof(sssd));
dp->dph = dptable + (16+15)*disk;
memclr(ram + dp->dph, 16+15);
xlt = cpmalloc(26); /* space for sector translation table */
memcpy(ram+xlt, xlt26, 26);
PutWORD(dp->dph, xlt);
doffs = 0;
}
else {
dp->dph = dptable + (16+15)*disk;
memclr(ram + dp->dph, 16+15);
doffs = 128;
}
PutWORD(dp->dph+8, dirbuff); /* pointer to directory buffer */
PutWORD(dp->dph+10, dp->dph+16); /* pointer to dpb */
memcpy(ram + dp->dph+16, buf + 32, 15); /* copy dpb into cp/m ram */
PutWORD(dp->dph+16+11, 0); /* check vector size = 0 (fixed disk) */
/* calculate memory requirement */
/* (((DSM+1)<<BSH) + OFFS*SPT + 1)*128 */
dp->isize = (((GetWORD(dp->dph+16+5) + 1) << GetBYTE(dp->dph+16+2)) +
GetWORD(dp->dph+16+13) * GetWORD(dp->dph+16+0) + 1) * 128;
alv = cpmalloc((GetWORD(dp->dph+16+5) >> 3) + 1);
if (alv == 0) {
fprintf(stderr, "insufficient space to mount %s\n", filename);
close(dp->ifd);
return 0;
}
PutWORD(dp->dph+14, alv); /* pointer to allocation vector */
#ifndef MAP_FILE
#define MAP_FILE 0
#endif
#ifdef __BOUNDS_CHECKING_ON
/* absurd -1 return code blows bgcc's mind */
dp->header = mmap(NULL, dp->isize, prot, MAP_FILE|MAP_SHARED, dp->ifd, 0);
#else
if ((dp->header = mmap(NULL, dp->isize, prot, MAP_FILE|MAP_SHARED,
dp->ifd, 0)) == (char *)-1) {
perror(filename);
close(dp->ifd);
return 0;
}
#endif
dp->filename = newstr(filename);
dp->data = (BYTE *) dp->header + doffs;
dp->flags |= MNT_ACTIVE;
return 1;
}
static const char *white = " \t";
static int
domount(char *cmd)
{
int d, v, r;
char *tok = strtok(NULL, white);
if ((v = tok && (strcmp(tok, "-v") == 0)))
tok = strtok(NULL, white);
if ((r = tok && (strcmp(tok, "-r") == 0)))
tok = strtok(NULL, white);
if (tok && !v) {
d = *tok - 'A';
if (d < 0 || d > 15)
d = *tok - 'a';
if (d < 0 || d > 15 || tok[1]) {
fprintf(stderr, "illegal disk specifier: %s\n", tok);
return 0;
}
tok = strtok(NULL, white);
mount(d, tok, r);
}
else for (d = 0; d < 16; d++)
if (mnttab[d].flags & MNT_ACTIVE)
showdisk(d, v);
return 0;
}
static int
doumount(char *cmd)
{
int d;
char *tok = strtok(NULL, white);
if (tok) {
d = *tok - 'a';
if (d < 0 || d > 15 || tok[1]) {
fprintf(stderr, "illegal disk specifier: %s\n", tok);
return 0;
}
umount(d);
}
return 0;
}
struct sio siotab[MAXPSTR] = {
{ NULL, NULL, "ttyin", 0, ST_IN2 },
{ NULL, NULL, "ttyout", 0, ST_OUT2 },
{ NULL, NULL, "crtin", 0, ST_IN2 },
{ NULL, NULL, "crtout", 0, ST_OUT2 },
{ NULL, NULL, "uc1in", 0, ST_IN2 },
{ NULL, NULL, "uc1out", 0, ST_OUT2 },
{ NULL, NULL, "rdr", 0, ST_IN },
{ NULL, NULL, "ur1", 0, ST_IN },
{ NULL, NULL, "ur2", 0, ST_IN },
{ NULL, NULL, "pun", 0, ST_OUT },
{ NULL, NULL, "up1", 0, ST_OUT },
{ NULL, NULL, "up2", 0, ST_OUT },
{ NULL, NULL, "lpt", 0, ST_OUT },
{ NULL, NULL, "ul1", 0, ST_OUT } };
/* Table of logical streams */
int chn[5];
static int
doattach(char *cmd)
{
int fd, i, opflags;
struct sio *s;
char *tok = strtok(NULL, white);
if (tok) {
char *p = tok + strlen(tok);
if (p > tok && *--p == ':')
*p = 0;
for (i = 0; i < MAXPSTR; i++) {
s = siotab + i;
if (strncmp(tok, s->streamname, 3) == 0)
break;
}
if (i == MAXPSTR) {
fprintf(stderr, "stream not recognized: %s\n", tok);
return 0;
}
if (s->strtype == ST_IN2) {
if (strcmp(tok, (s+1)->streamname) == 0) {
s++;
opflags = O_WRONLY|O_CREAT|O_TRUNC;
}
else if (strcmp(tok, s->streamname) == 0)
opflags = O_RDONLY;
else
opflags = O_RDWR|O_CREAT;
}
else
opflags = s->strtype == ST_IN ? O_RDONLY : O_WRONLY|O_CREAT|O_TRUNC;
tok = strtok(NULL, white);
if (!tok || !*tok) {
fputs("need a filename\n", stderr);
return 0;
}
if (s->fp) {
fclose(s->fp);
s->fp = NULL;
free(s->filename);
}
if ((fd = open(tok, opflags, 0666)) < 0)
perror(tok);
else {
char *mode = "rb";
if (opflags & O_WRONLY)
mode = "wb";
else if (opflags & O_RDWR)
mode = "r+b";
s->filename = newstr(tok);
s->fp = fdopen(fd, mode);
s->tty = isatty(fd);
s->canselect = s->tty || isafifo(fd); /* gr */
}
}
else for (i = 0; i < MAXPSTR; i++) {
s = siotab + i;
if (s->fp)
printf("%s:\t%s\n", s->streamname, s->filename);
}
return 0;
}
static int
dodetach(char *cmd)
{
int i;
struct sio *s;
char *tok = strtok(NULL, white);
if (tok) {
char *p = tok + strlen(tok);
if (p > tok && *--p == ':')
*p = 0;
for (i = 0; i < MAXPSTR; i++) {
s = siotab + i;
if (strncmp(tok, s->streamname, 3) == 0)
break;
}
if (i == MAXPSTR) {
fprintf(stderr, "stream not recognized: %s\n", tok);
return 0;
}
if (s->fp) {
fclose(s->fp);
s->fp = NULL;
free(s->filename);
}
}
return 0;
}
static long
getval(char *s)
{
char *tok = s+2;
if (*tok == 0)
tok = strtok(NULL, white);
if (tok && *tok) {
long unit = 1;
char u = tok[strlen(tok)-1];
switch (toupper(u)) {
case 'K':
unit = 1024;
break;
case 'M':
unit = 1024*1024;
break;
}
return unit*strtol(tok, NULL, 10);
}
else {
fprintf(stderr, "option needs a value: %s\n", s);
return -1;
}
}
static void
checkval(int ok, long val, char *msg)
{
if (!ok)
fprintf(stderr, "bad %s value: %ld\n", msg, val);
}
/* count ones in a 16-bit value */
static int
popcount(long v)
{
int total;
total = ((v>>1) & 0x5555) + (v & 0x5555);
total = ((total>>2) & 0x3333) + (total & 0x3333);
total = ((total>>4) & 0x0f0f) + (total & 0x0f0f);
return (total & 0xff) + (total>>8);
}
static void
makedisk(FILE *f, char *fn, long diroffs, long dirsize, long fullsize)
{
long n;
BYTE sector[128];
memset(sector, 0xe5, sizeof sector);
/* skip offset tracks */
if (fseek(f, diroffs, SEEK_CUR) < 0) {
fclose(f);
perror(fn);
return;
}
/* write empty directory */
for (n = 0; n < dirsize; n += sizeof sector)
if (fwrite(sector, sizeof sector, 1, f) == 0) {
fclose(f);
perror(fn);
return;
}
/* seek to end of disk and write last sector to define size */
if (fseek(f, fullsize - sizeof sector, SEEK_SET) < 0 ||
fwrite(sector, sizeof sector, 1, f) == 0 ||
fclose(f) != 0)
perror(fn);
}
/* create a new CP/M disk */
static int
docreate(char *tok)
{
char *fn = NULL;
FILE *f;
long size = 1024*1024;
char head[128];
long dsm, spt = -1, bsize = -1, drm = -1, offs = -1;
int dblocks;
WORD al01;
while ((tok = strtok(NULL, white)) != NULL) {
if (*tok == '-')
switch (tok[1]) {
case 'b':
bsize = getval(tok);
break;
case 'd':
drm = getval(tok);
break;
case 'o':
offs = getval(tok);
break;
case 's':
spt = getval(tok);
break;
default:
fprintf(stderr, "unrecognized option: %s\n", tok);
}
else {
fn = tok;
break;
}
}
if (fn == NULL) {
fputs("need a filename\n", stderr);
return 0;
}
if ((tok = strtok(NULL, white)) != NULL) {
char unit = 'b';
int n = sscanf(tok, "%ld%c", &size, &unit);
if (n == 2)
switch (toupper(unit)) {
case 'B':
break;
case 'K':
size *= 1024;
break;
case 'M':
size *= 1024*1024;
break;
default:
fprintf(stderr, "units not recognized: %s\n", tok);
return 0;
}
else if (n != 1) {
fprintf(stderr, "need numeric size: %s\n", tok);
return 0;
}
}
if ((f = fopen(fn, "w")) == NULL) {
perror(fn);
return 0;
}
if (size == 256256 && (spt == -1 || spt == 26) &&
(bsize == -1 || bsize == 1024) &&
(drm == -1 || drm == 63) &&
(offs == -1 || offs == 2)) {
/* raw standard sssd floppy format */
spt = 26;
drm = 63;
offs = 2;
/* we clear all tracks that might contain directory sectors,
thus avoiding messing with the sector translation table */
makedisk(f, fn, 128*spt*offs, 128*(((drm+4)/4+spt-1)/spt)*spt, size);
return 0;
}
else if (size < 256*1024) {
if (bsize == -1)
bsize = 1024;
if (drm == -1)
drm = 63;
if (spt == -1)
spt = 26;
if (offs == -1)
offs = 0;
}
else {
if (bsize == -1)
bsize = 2048;
if (drm == -1)
drm = 1023;
if (spt == -1)
spt = 26;
if (offs == -1)
offs = 0;
}
dsm = (size - offs*spt*128)/bsize - 1;
checkval(spt <= 0xffff, spt, "sectors per track");
checkval(size/(spt*128)+offs <= 0xffff, size/(spt*128)+offs, "tracks");
checkval(((bsize&(bsize-1))==0) &&
(bsize >= ((dsm < 256) ? 1024 : 2048)) &&
bsize <= 16384, bsize, "block size");
dblocks = ((drm+1)*32+bsize-1)/bsize;
checkval(dblocks<=16 && dblocks < dsm, drm, "max directory entry");
memclr(head, sizeof head);
sprintf(head, "<CPM_Disk>");
head[32] = spt;
head[33] = spt>>8;
head[34] = popcount(bsize-1)-7; /* bsh */
head[35] = (bsize/128-1); /* blm */
head[36] = dsm < 256 ? bsize/1024-1 : bsize/2048-1; /* exm */
head[37] = dsm;
head[38] = dsm>>8;
head[39] = drm;
head[40] = drm>>8;
al01 = ~((1<<(16-dblocks))-1);
head[41] = al01>>8;
head[42] = al01;
head[45] = offs;
head[46] = offs>>8;
if (fwrite(head, sizeof head, 1, f) == 0) {
fclose(f);
perror(fn);
return 0;
}
makedisk(f, fn, 128*spt*offs, 128*(drm+4)/4, sizeof head + size);
return 0;
}
static int
hexdig(char c)
{
if ('0' <= c && c <= '9')
return c - '0';
if ('A' <= c && c <= 'F')
return c - 'A' + 10;
if ('a' <= c && c <= 'f')
return c - 'a' + 10;
return -1;
}
static int
doint(char *cmd)
{
int d1, d2;
char *tok = strtok(NULL, white);
if (tok) {
if (strlen(tok) != 2) {
bad:
printf("%s invalid key specifier\n", tok);
return 0;
}
/* let's face it: this doesn't work if the host character set is not ascii */
if (tok[0] == '^' && '@' <= tok[1])
interrupt = tok[1] & 0x1f;
else {
if ((d1 = hexdig(tok[0])) < 0)
goto bad;
if ((d2 = hexdig(tok[1])) < 0)
goto bad;
interrupt = (d1<<4)+d2;
}
rawtio.c_lflag = interrupt ? ISIG : 0;
rawtio.c_cc[VINTR] = interrupt;
}
else {
fputs("interrupt key is ", stdout);
if (interrupt == 0)
puts("disabled");
else if (interrupt < 0x20)
printf("^%c\n", interrupt+'@');
else
printf("%2x\n", interrupt);
}
return 0;
}
static int
dotime(char *cmd)
{
static clock_t lastreal;
clock_t now;
static struct tms lastbuf;
struct tms tbuf;
long tickspersec = CLK_TCK;
extern char *perl_params;
now = times(&tbuf);
printf("elapsed=%.3f, user=%.3f, sys=%.3f (%s)\n",
((double)(now-lastreal))/tickspersec,
((double)(tbuf.tms_utime-lastbuf.tms_utime))/tickspersec,
((double)(tbuf.tms_stime-lastbuf.tms_stime))/tickspersec,
perl_params);
lastreal = now;
lastbuf = tbuf;
return 0;
}
static int
dogo(char *cmd)
{
return 1;
}
static int
doshell(char *cmd)
{
char *shell = getenv("SHELL");
#ifdef DEBUG
void (*sigint)(int);
sigint = signal(SIGINT, SIG_IGN);
#endif
if (shell == NULL)
shell = "/bin/sh";
if (cmd[1])
system(cmd+1);
else
system(shell);
#ifdef DEBUG
(void) signal(SIGINT, sigint);
#endif
return 0;
}
static int
doquit(char *cmd)
{
exit(0);
}
static int dohelp(char *cmd);
typedef struct {
char *name; /* User printable name of the function. */
int (*func)(char *); /* Function to call to do the job. */
char *doc; /* Short documentation. */
char *detail; /* Long documentation. */
} COMMAND;
static COMMAND commands[] = {
{ "help", dohelp, "Display this text or give help about a command",
"help <cmd> displays more information about <cmd>" },
{ "?", dohelp, "Synonym for `help'", NULL },
{ "attach", doattach, "Attach CP/M device to a unix file",
"attach without arguments lists the current attachments\n"
"attach <physdev> <file> attaches <physdev> to the unix <file>,\n"
" where <physdev> is one of ttyin, ttyout,\n"
" crtin, crtout, uc1in, uc1out, rdr,\n"
" ur1, ur2, pun, up1, up2, lpt, ul1" },
{ "detach", dodetach, "Detach CP/M device from file",
"detach <physdev> closes the file attached to <physdev>\n"
" (see attach)" },
{ "mount", domount, "Mount a unix file or directory as a CP/M disk",
"mount without arguments lists the mount table\n"
"mount -v lists the mount table verbosely\n"
"mount <drive> <file> mounts <file> as CP/M disk <drive>\n"
" (a letter from a..p).\n"
" If <file> is a plain file it must contain a CP/M filesystem.\n"
" If <file> is a unix directory its contents may be accessed\n"
" as a read-only CP/M disk\n"
"mount -r <drive> <file> mounts the <file> read/only." },
{ "umount", doumount, "Unmount a CP/M disk",
"umount <drive> closes the file associated with <drive>\n"
" and frees the resources" },
{ "create", docreate, "Create a new disk",