V10/games/sail/screen.c
#ifndef lint
static char *sccsid = "@(#)screen.c 1.2 83/05/20";
#endif
#include "externs.h"
#include <sys/types.h>
#include <sys/stat.h>
extern int choke();
readpos()
{
register int n;
register postype *p = pos;
register ships *s = scene[game].ship;
for (n = scene[game].vessels; n > 0; n--, p++, s++){
p->row = s->shiprow;
p->col = s->shipcol;
p->dir = s->shipdir;
if (s->file->explode == 2 || s->file->sink == 2)
p->dir = 0;
}
}
makesignal(fmt, shipnum, owner)
int shipnum, owner;
char *fmt;
{
int junk;
char message[60];
sprintf(message, fmt, scene[game].ship[shipnum].shipname, colours(shipnum), sterncolor(shipnum, &junk, &junk));
Write(FILES + owner, 1, 164, message);
}
#define PI 3.1415926535
float contable[8] = {1.5708, 0.7854, 0.0, -0.7854, -1.5708, -2.3562, -PI, 2.3562};
angle(dr, dc)
register dr, dc;
{
register i;
if (dc >= 0 && dr > 0)
i = 0;
else if (dr <= 0 && dc > 0)
i = 2;
else if (dc <= 0 && dr < 0)
i = 4;
else
i = 6;
dr = abs(dr);
dc = abs(dc);
if ((i == 0 || i == 4) && dc * 2.4 > dr) {
i++;
if (dc > dr * 2.4)
i++;
} else if ((i == 2 || i == 6) && dr * 2.4 > dc) {
i++;
if (dr > dc * 2.4)
i++;
}
return i % 8 + 1;
}
char gunsbear(fromship, toship) /* checks for target bow or stern */
{
int dr, dc, i;
register ang;
register postype *from = &pos[fromship];
register postype *to = &pos[toship];
dr = from->row - to->row;
dc = to->col - from->col;
for (i = 2; i; i--) {
if ((ang = angle(dr, dc) - from->dir + 1) < 1)
ang += 8;
if (ang >= 2 && ang <= 4)
return 'r';
if (ang >= 6 && ang <= 7)
return 'l';
drdc(&dr, &dc, to->dir);
}
return 0;
}
portside(fromship, onship, quick)
register fromship, onship;
int quick; /* returns true if fromship is */
{ /* shooting at onship's starboard side */
register ang;
int dr, dc;
dr = pos[fromship].row - pos[onship].row;
dc = pos[onship].col - pos[fromship].col;
if (quick == -1)
drdc(&dr, &dc, pos[onship].dir);
ang = angle(dr, dc);
if (quick != 0)
return ang;
ang = (ang + 4 - pos[onship].dir - 1) % 8 + 1;
return ang < 5;
}
int tantable[40] = {0,100,197,291,381,464,540,610,675,733,785,833,876,915,951,983,1012,1039,1064,1086,1107,1126,1144,1161,1176,1190,1204,1216,1227,1239,1249,1259,1268,1277,1285,1293,1300,1307,1313,1470};
double arctan(y,x)
int y,x;
{
int sx, sy;
register int index;
sy = y < 0 ? -1 : 1;
sx = x < 0 ? -1 : 1;
y *= sy;
x *= sx;
if (!x) return((double) PI/2 * sy);
index = (10*y)/x + 0.5;
if (index > 39) index = 39;
return((double) (sy * (sx < 0 ? PI : 0 + sx*(tantable[index]/1000))));
}
boarders(from, key)
int from, key;
{
register int n;
struct BP *ptr;
ptr = key ? scene[game].ship[from].file->DBP : scene[game].ship[from].file->OBP ;
for (n=0; n < 3; n++){
if (ptr[n].turnsent)
return(1);
}
return(0);
}
lengthof(string)
char *string;
{
register int n;
for (n=0; string[n]; n++);
return(n);
}
Write(address, string, offset, value)
int string, address, offset, value;
{
int fd;
char file[25];
int *ptr;
char *cptr;
struct BP *bptr;
struct snag *sptr;
if (string){
sprintf(Outbuf + buffercount, "%d %d %d %s\n", address, string, offset, value);
}
else {
sprintf(Outbuf + buffercount, "%d %d %d %d\n", address, string, offset, value);
}
buffercount += lengthof(Outbuf + buffercount);
if (address < 32){
ptr = &scene[game].ship[address].shipnum;
*(ptr + (offset - 2)/2) = value;
} else if (address < 64){
address -= SPECS;
ptr = &specs[scene[game].ship[address].shipnum].bs;
*(ptr + offset/2) = value;
} else if (address < 128){
address -= FILES;
ptr = &scene[game].ship[address].file->points;
if (offset >= 30 && offset < 48){
bptr = scene[game].ship[address].file->OBP;
switch(((offset - 30) % 6) / 2){
case 0:
bptr[(offset - 30)/6].turnsent = value;
break;
case 1:
bptr[(offset - 30)/6].toship = value;
break;
case 2:
bptr[(offset - 30)/6].mensent = value;
break;
}
}
if (offset >= 48 && offset < 66){
bptr = scene[game].ship[address].file->DBP;
switch(((offset - 48) % 6) / 2){
case 0:
bptr[(offset - 48)/6].turnsent = value;
break;
case 1:
bptr[(offset - 48)/6].toship = value;
break;
case 2:
bptr[(offset - 48)/6].mensent = value;
break;
}
}
if (offset >= 84 && offset < 124){
sptr = scene[game].ship[address].file->fouls;
switch(((offset - 84) % 4) / 2){
case 0:
sptr[(offset - 84) / 4].turnfoul = value;
break;
case 1:
sptr[(offset - 84) / 4].toship = value;
break;
}
}
if (offset >= 124 && offset < 164){
sptr = scene[game].ship[address].file->grapples;
switch(((offset - 124) % 4) / 2){
case 0:
sptr[(offset - 124) / 4].turnfoul = value;
break;
case 1:
sptr[(offset - 124) / 4].toship = value;
break;
}
}
if (offset > 72) ptr = &scene[game].ship[address].file->drift;
if (offset > 164) ptr = &scene[game].ship[address].file->RH;
cptr = scene[game].ship[address].file->captain;
if (offset == 72) cptr = scene[game].ship[address].file->last;
if (offset == 164) cptr = scene[game].ship[address].file->signal;
if (!string)
*(ptr + (offset - (offset > 72 ? (offset < 164 ? 82 : 224) : 20))/2 ) = value;
else
strcpy(cptr, (char *) value);
} else {
ptr = &scene[game].winddir;
*(ptr + offset/2) = value;
}
}
sync()
{
char file[25];
char source[25];
int address, string;
int offset, value[40];
int fd, *ptr;
char *cptr;
struct BP *bptr;
struct snag *sptr;
register int n;
int (*sig1)(), (*sig2)();
sig1 = signal(SIGHUP, SIG_IGN);
sig2 = signal(SIGINT, SIG_IGN);
sprintf(file, "/tmp/sync.%d", game);
sprintf(source, "/tmp/.sail.%d", game);
for(n = 0; link(source, file) == -1 && n < 30; n++)
sleep(2);
fseek(syncfile, lastsync, 0);
while(fscanf(syncfile, "%d%d%d", &address, &string, &offset) != EOF){
if (string){
fgets((char *) value, 60, syncfile);
rmend((char *) value);
while(*(char *)value == ' ')
strcpy((char *) value, (char *) value + 1);
}
else
fscanf(syncfile, "%d", value);
if (address < 32){
ptr = &scene[game].ship[address].shipnum;
*(ptr + (offset - 2)/2) = value[0];
continue;
}
if (address < 64){
address -= SPECS;
ptr = &specs[scene[game].ship[address].shipnum].bs;
*(ptr + offset/2) = value[0];
continue;
}
if (address < 128){
address -= FILES;
ptr = &scene[game].ship[address].file->points;
if (offset >= 30 && offset < 48){
bptr = scene[game].ship[address].file->OBP;
switch(((offset - 30) % 6) / 2){
case 0:
bptr[(offset - 30)/6].turnsent = value[0];
break;
case 1:
bptr[(offset - 30)/6].toship = value[0];
break;
case 2:
bptr[(offset - 30)/6].mensent = value[0];
break;
}
}
if (offset >= 48 && offset < 66){
bptr = scene[game].ship[address].file->DBP;
switch(((offset - 48) % 6) / 2){
case 0:
bptr[(offset - 48)/6].turnsent = value[0];
break;
case 1:
bptr[(offset - 48)/6].toship = value[0];
break;
case 2:
bptr[(offset - 48)/6].mensent = value[0];
break;
}
}
if (offset >= 84 && offset < 124){
sptr = scene[game].ship[address].file->fouls;
switch(((offset - 84) % 4) / 2){
case 0:
sptr[(offset - 84) / 4].turnfoul = value[0];
break;
case 1:
sptr[(offset - 84) / 4].toship = value[0];
break;
}
}
if (offset >= 124 && offset < 164){
sptr = scene[game].ship[address].file->grapples;
switch(((offset - 124) % 4) / 2){
case 0:
sptr[(offset - 124) / 4].turnfoul = value[0];
break;
case 1:
sptr[(offset - 124) / 4].toship = value[0];
break;
}
}
if (offset > 72) ptr = &scene[game].ship[address].file->drift;
if (offset > 164) ptr = &scene[game].ship[address].file->RH;
cptr = scene[game].ship[address].file->captain;
if (offset == 72) cptr = scene[game].ship[address].file->last;
if (offset == 164) cptr = scene[game].ship[address].file->signal;
if (!string)
*(ptr + (offset - (offset > 72 ? (offset < 164 ? 82 : 224) : 20))/2 ) = value[0];
else
strcpy(cptr, (char *) value);
continue;
}
ptr = &scene[game].winddir;
*(ptr + offset/2) = value[0];
}
if (buffercount){
fseek(syncfile, 0L, 2);
fprintf(syncfile, "%s", Outbuf);
fflush(syncfile);
buffercount = 0;
}
lastsync = ftell(syncfile);
unlink(file);
signal(SIGHUP, sig1);
signal(SIGINT, sig2);
}
rmend(str)
char *str;
{
register int n;
for (n=0; *(str + n); n++);
if (n)
*(str + n - 1) = '\0';
}
char
colours(ship)
int ship;
{
char flag;
int index;
struct File *ptr;
ptr = scene[game].ship[ship].file;
if (ptr->struck)
flag = '!';
if (ptr->explode)
flag = '#';
if (ptr->sink)
flag = '~';
if (ptr->struck)
return(flag);
if (ptr->captured > -1)
index = scene[game].ship[ptr->captured].nationality;
else
index = scene[game].ship[ship].nationality;
switch(index){
case 0:
flag = 'a';
break;
case 1:
flag = 'b';
break;
case 2:
flag = 's';
break;
case 3:
flag = 'f';
break;
}
return(ptr->FS ? flag - 32 : flag);
}
char
sterncolor(ship, sternr, sternc)
int ship, *sternr, *sternc;
{
int sr, sc;
int cap;
cap = scene[game].ship[ship].file->captured;
sr = pos[ship].row;
sc = pos[ship].col;
drdc(&sr,&sc,pos[ship].dir);
*sternr = sr;
*sternc = sc;
ship -= nation[scene[game].ship[ship].nationality];
return(ship + '0' - 10*(cap > -1));
}