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Aminet 2
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Aminet AMIGA CDROM (1994)(Walnut Creek)[Feb 1994][W.O. 44790-1].iso
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larn.zoo
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msdos.c
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C/C++ Source or Header
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1991-04-28
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12KB
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482 lines
#ifdef MSDOS
# include <stdio.h>
# include <process.h>
# include <dos.h>
# include <fcntl.h>
# include <sys/types.h>
# include <sys/stat.h>
# include "header.h"
# include "larndefs.h"
# define DEVICE 0x80
# define RAW 0x20
# define IOCTL 0x44
# define STDIN 0
# define STDOUT 1
# define GETBITS 0
# define SETBITS 1
# define PATHSEP ';'
/* Normal characters are output when the shift key is not pushed.
* Shift characters are output when either shift key is pushed.
*/
# define KEYPADHI 83
# define KEYPADLOW 71
# define iskeypad(x) (KEYPADLOW <= (x) && (x) <= KEYPADHI)
static struct {
char normal, shift;
} pad[KEYPADHI - KEYPADLOW + 1] = {
{'y', 'Y'}, /* 7 */
{'k', 'K'}, /* 8 */
{'u', 'U'}, /* 9 */
{' ', ' '}, /* - */
{'h', 'H'}, /* 4 */
{' ', ' '}, /* 5 */
{'l', 'L'}, /* 6 */
{' ', ' '}, /* + */
{'b', 'B'}, /* 1 */
{'j', 'J'}, /* 2 */
{'n', 'N'}, /* 3 */
{'i', 'i'}, /* Ins */
{'.', '.'} /* Del */
};
/* BIOSgetch gets keys directly with a BIOS call.
*/
#ifdef OS2LARN
# define SHIFT (RIGHTSHIFT | LEFTSHIFT)
#else
# define SHIFT (0x1 | 0x2)
#endif
# define KEYBRD_BIOS 0x16
static char
BIOSgetch() {
unsigned char scan, shift, ch;
union REGS regs;
#ifdef OS2LARN
KBDKEYINFO kbd;
KbdCharIn(&kbd,IO_WAIT,(HKBD) 0);
ch = kbd.chChar;
scan = kbd.chScan;
shift = kbd.fsState;
#else
/* Get scan code.
*/
regs.h.ah = 0;
int86(KEYBRD_BIOS, ®s, ®s);
ch = regs.h.al;
scan = regs.h.ah;
/* Get shift status.
*/
regs.h.ah = 2;
int86(KEYBRD_BIOS, ®s, ®s);
shift = regs.h.al;
#endif
/* If scan code is for the keypad, translate it.
*/
if (iskeypad(scan)) {
if (shift & SHIFT)
ch = pad[scan - KEYPADLOW].shift;
else
ch = pad[scan - KEYPADLOW].normal;
}
return ch;
}
kgetch()
{
/* BIOSgetch can use the numeric key pad on IBM compatibles. */
if (keypad)
return BIOSgetch();
else
return getch();
}
doshell()
{
char *comspec = getenv("COMSPEC");
clear();
lflush();
if (comspec == NULL
|| (spawnl(P_WAIT, comspec, comspec, NULL) < 0)) {
write(2, "A> ", 3);
while (getche() != '\r')
;
}
}
static unsigned old_stdin, old_stdout, ioctl();
static unsigned
ioctl(handle, mode, setvalue)
unsigned setvalue;
{
#ifndef OS2LARN
union REGS regs;
regs.h.ah = IOCTL;
regs.h.al = mode;
regs.x.bx = handle;
regs.h.dl = setvalue;
regs.h.dh = 0; /* Zero out dh */
intdos(®s, ®s);
return (regs.x.dx);
#endif
}
int rawio;
void
setraw()
{
if (!rawio)
return;
old_stdin = ioctl(STDIN, GETBITS, 0);
old_stdout = ioctl(STDOUT, GETBITS, 0);
if (old_stdin & DEVICE)
(void) ioctl(STDIN, SETBITS, old_stdin | RAW);
if (old_stdout & DEVICE)
(void) ioctl(STDOUT, SETBITS, old_stdout | RAW);
}
void
unsetraw()
{
if (!rawio)
return;
if (old_stdin)
(void) ioctl(STDIN, SETBITS, old_stdin);
if (old_stdout)
(void) ioctl(STDOUT, SETBITS, old_stdout);
}
/* Add a backslash to any name not ending in /, \ or : There must
* be room for the \
*/
void
append_slash(name)
char *name;
{
char *ptr;
if (!*name)
return;
ptr = name + (strlen(name) - 1);
if (*ptr != '\\' && *ptr != '/' && *ptr != ':') {
*++ptr = '\\';
*++ptr = '\0';
}
}
/* Lopen a file somewhere along the PATH
*/
plopen(name)
char *name;
{
char buf[PATHLEN], *bp, *pp, lastch, *strchr();
int fd;
/* Try the default directory first. Then look along PATH unless
* the name has path components.
*/
if ((fd = lopen(name)) >= 0)
return fd;
else if (strpbrk(name, "\\/:") == NULL) {
pp = getenv("PATH");
while (pp && *pp) {
bp = buf;
while (*pp && *pp != PATHSEP)
lastch = *bp++ = *pp++;
if (strchr("\\/:", lastch) == NULL)
*bp++ = '\\';
strcpy(bp, name);
if ((fd = lopen(buf)) >= 0)
return fd;
if (*pp)
pp++;
}
}
return -1;
}
/* Follow the PATH, trying to fopen the file. Takes one additional
* argument which can be NULL. Otherwise this argument gets filled
* in the full path to the file. Returns as does fopen().
*/
FILE *
fopenp(name, mode, pathname)
char *name, *mode, *pathname;
{
char buffer[BUFSIZ], *buf, *bufp, *pathp, *getenv(), lastch;
FILE *fp;
/* If pathname is given, use it instead of buf so the calling
* process knows the path we found name under
*/
if (pathname)
buf = pathname;
else
buf = buffer;
/* Try the default directory first. If the file can't be opened,
* start looking along the path.
*/
strcpy(buf, name);
if (fp = fopen(buf, mode))
return fp;
else if (strpbrk(name, "\\/:") == NULL) {
pathp = getenv("PATH");
while (pathp && *pathp) {
bufp = buf;
while (*pathp && *pathp != PATHSEP)
lastch = *bufp++ = *pathp++;
if (lastch != '\\' && lastch != '/')
*bufp++ = '\\';
strcpy(bufp, name);
if (fp = fopen(buf, mode))
return fp;
if (*pathp)
pathp++;
}
}
return NULL;
}
/* Diagnositic information about the disposition of levels between ram
* and disk.
*/
levelinfo()
{
DISKBLOCK *dp;
RAMBLOCK *rp;
cursors();
lflush();
fprintf(stderr, "\nRAM:\n");
for (rp = ramblks; rp; rp = rp->next)
fprintf(stderr, "%4d gt:%6ld\n", rp->level, rp->gtime);
fprintf(stderr, "\nDISK:\n");
for (dp = diskblks; dp; dp = dp->next)
fprintf(stderr, "%4d gt:%6ld fpos:%ld\n",
dp->level, dp->gtime, dp->fpos);
nomove=1;
return (yrepcount = 0);
}
int swapfd = 0; /* file descriptor for the swap file */
int ramlevels = MAXLEVEL + MAXVLEVEL; /* the maximum */
/* Allocate as many levels as possible, then check that the swap file
* will have enough storage for the overflow. You must be able to allocate
* at least one level or there will be nowhere to swap to/from. If a swap
* file is opened it remains open for the whole game.
*/
allocate_memory()
{
register int i;
DISKBLOCK *dp, *dp2;
RAMBLOCK *rp;
/* First allocate the maximum number of disk blocks, some of which
* may not be used, but must do the allocation now since we don't
* yet know how many levels will be allocatable.
*/
for (i = 0; i < MAXLEVEL + MAXVLEVEL; i++) {
if ((dp = (DISKBLOCK *) malloc(sizeof(DISKBLOCK))) == NULL)
died(-285);
dp->next = diskblks;
diskblks = dp;
}
dp = diskblks; /* Move this along in the next loop */
/* Now allocate ram storage, up to ramlevels in count.
*/
for (i = 0; i < MAXLEVEL + MAXVLEVEL; i++) {
if (i < ramlevels)
rp = (RAMBLOCK *) malloc(sizeof(RAMBLOCK));
else
rp = NULL;
if (rp == NULL) {
if (i == 0)
died(-285); /* have to have at least one */
/* Open the swap file if not yet done so
*/
if (swapfd == 0) {
swapfd = open(swapfile,
O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
S_IWRITE | S_IREAD);
if (swapfd < 0)
error("Can't open swapfile `%s'\n",
swapfile);
/* First block is FREE and will be used to
* swap out the first level. When another
* level gets swapped in, its block will be
* FREE.
*/
if (dp == NULL)
error("NULL1 disk pointer?\n");
dp->level = FREEBLOCK;
dp->fpos = 0;
dp->gtime = 0;
lseek(swapfd, (long) sizeof rp->cell, 0);
}
/* And try to seek the size of this level
*/
dp = dp->next;
if (dp == NULL)
error("NULL2 disk pointer?\n");
dp->level = FREEBLOCK;
dp->gtime = 0;
dp->fpos = tell(swapfd);
if (lseek(swapfd, (long) sizeof rp->cell, 1) < 0L)
error("Not enough disk space for swapfile `%s'\n",
swapfile);
} else {
rp->next = ramblks;
ramblks = rp;
rp->level = FREEBLOCK;
rp->gtime = 0;
}
}
/* dp now points to the last diskblock used. Truncate the diskblock
* list here and free up the other blocks (for what it's worth ...)
*/
dp2 = dp->next;
dp->next = NULL;
dp = dp2;
while (dp) {
dp2 = dp->next;
free((char *) dp);
dp = dp2;
}
}
/* VARARGS1 */
warn(format, a1, a2, a3)
char *format;
long a1, a2, a3;
{
fprintf(stderr, format, a1, a2, a3);
}
/* VARARGS1 */
error(format, a1, a2, a3, a4)
char *format;
long a1, a2, a3, a4;
{
unsetraw();
resetcursor();
fputc('\n', stderr);
fprintf(stderr, format, a1, a2, a3, a4);
sleep(5);
exit(1);
}
static unsigned char ocursorstart, ocursorend;
unsigned char cursorstart, cursorend;
int cursorset;
/* Save the old value of the cursor then put in the new value.
*/
# define READCURSORPOS 0x03
# define SETCURSORTYPE 0x01
# define BIOSVIDEO 0x10
setcursor()
{
#ifdef OS2LARN
USHORT rc;
VIOCURSORINFO curinfo;
if (cursorset == 0)
return;
/* Save the cursor type in 'ocursorstart' and 'ocursorend'.
*/
rc = VioGetCurType((PVIOCURSORINFO) &curinfo, (HVIO) NULL);
if (rc != 0)
{
/* errors don't happen. */
}
ocursorstart = curinfo.yStart;
ocursorend = curinfo.cEnd;
/* set the cursor type according to global variables
'cursorstart' and 'cursorend'.
*/
curinfo.cEnd = cursorend;
curinfo.yStart = cursorstart;
curinfo.cx = 0; /* default width, 1 char */
curinfo.attr = 0; /* 'Normal' attribute */
rc = VioSetCurType((PVIOCURSORINFO) &curinfo, (HVIO) NULL);
if (rc != 0)
{
/* errors don't happen. */
}
#else
union REGS regs;
if (cursorset == 0)
return;
regs.h.ah = READCURSORPOS;
regs.h.bh = 0;
int86(BIOSVIDEO, ®s, ®s);
ocursorstart = regs.h.ch;
ocursorend = regs.h.cl;
regs.h.ah = SETCURSORTYPE;
regs.h.bh = 0;
regs.h.ch = cursorstart;
#if 0
regs.h.ch = 0x20 ;
#endif
regs.h.cl = cursorend;
int86(BIOSVIDEO, ®s, ®s);
#endif
}
/* Restore the old cursor upon exit
*/
resetcursor()
{
#ifdef OS2LARN
VIOCURSORINFO curinfo;
if (cursorset == 0)
return;
curinfo.cEnd = ocursorend;
curinfo.yStart = ocursorstart;
curinfo.cx = 0; /* default width, 1 char */
curinfo.attr = 0; /* 'Normal' attribute */
VioSetCurType((PVIOCURSORINFO) &curinfo, (HVIO) NULL);
#else
union REGS regs;
if (cursorset == 0)
return;
regs.h.ah = SETCURSORTYPE;
regs.h.bh = 0;
regs.h.ch = ocursorstart;
regs.h.cl = ocursorend;
int86(BIOSVIDEO, ®s, ®s);
#endif
}
# endif /* MSDOS */