ref: 578af37678b2ea16e29d950cbc352823cd2491ab
dir: /sys/src/games/v8e/cpubcd.c/
#include <u.h>
#include <libc.h>
#include "dat.h"
#include "fns.h"
static s8int
getsign(u16int l, u32int a)
{
u8int c;
if(l == 0) return 1;
c = readm(a + l/2, 0);
c &= 0xf;
if(c == 11 || c == 13) return -1;
return 1;
}
static int
getdig(u16int l, u32int a, int i)
{
u8int c;
if(i >= l) return 0;
i = l - 1 - i;
if((l & 1) == 0) i++;
a += i/2;
c = readm(a, 0);
if((i & 1) == 0) return c >> 4;
return c & 0xf;
}
static void
putdig(u16int l, u32int a, int i, int v)
{
u8int c;
if(i >= l){
if(v != 0)
ps |= FLAGV;
return;
}
i = l - 1 - i;
if((l & 1) == 0) i++;
a += i/2;
if((l & 1) == 0 && i == 1)
c = 0;
else
c = readm(a, 0);
if((i & 1) == 0) c = c & 0x0f | v << 4;
else c = c & 0xf0 | v;
writem(a, c, 0);
}
static void
putsign(u16int l, u32int a, s8int s)
{
u8int c;
a += l/2;
c = readm(a, 0);
c = c & 0xf0 | 12 | s < 0;
writem(a, c, 0);
}
static u32int
sigdig(u16int l, u32int a)
{
u32int e;
e = a + l/2 + 1;
for(; a < e; a++)
if(readm(a, 0) != 0)
return a;
return a;
}
void
cvtlp(void)
{
s32int x;
u16int l;
u32int a;
u8int v;
int i;
x = readm(amode(2), 2);
l = readm(amode(1), 1);
a = addrof(amode(0));
ps = ps & ~15 | FLAGZ;
if(x < 0){
x = -x;
ps |= FLAGN;
}
for(i = 0; i < l; i++){
v = x % 10;
x /= 10;
putdig(l, a, i, v);
if(v != 0) ps &= ~FLAGZ;
}
if(x != 0) ps |= FLAGV;
if((ps & (FLAGN|FLAGZ)) == 0)
ps &= ~FLAGN;
putsign(l, a, -((ps & FLAGN) != 0));
r[0] = 0;
r[1] = 0;
r[2] = 0;
r[3] = sigdig(l, a);
}
static uchar
editread(void)
{
u8int rc;
if((s32int) r[0] <= 0){
if(r[0] == 0)
sysfatal("editread");
r[0] += 0x10000;
return 0;
}else{
rc = readm(r[1], 0);
if((r[0] & 1) != 0)
rc >>= 4;
else
rc &= 0xf;
r[0]--;
if((r[0] & 1) != 0)
r[1]++;
return rc;
}
}
void
editpc(void)
{
u8int p, c;
int i;
r[0] = readm(amode(1), 1);
r[1] = addrof(amode(0));
r[2] = 0x2020;
r[3] = addrof(amode(0));
r[5] = addrof(amode(0));
ps = ps & ~15 | FLAGZ;
c = readm(r[1] + r[0]/2, 0) & 0xf;
if(c == 11 || c == 13){
ps |= FLAGN;
r[2] |= 0xd00;
}
for(;;){
p = readm(r[3]++, 0);
switch(p){
case 0x00:
if(r[0] != 0) sysfatal("editpc");
if((ps & FLAGZ) != 0)
ps &= ~FLAGN;
return;
case 0x01:
if((ps & FLAGC) == 0){
writem(r[5]++, r[2] >> 8, 0);
ps |= FLAGC;
}
break;
case 0x02: ps &= ~FLAGC; break;
case 0x03: ps |= FLAGC; break;
case 0x04: writem(r[5]++, r[2] >> 8, 0); break;
case 0x40: r[2] = r[2] & ~0xff | (u8int)readm(r[3]++, 0); break;
case 0x41: r[2] = r[2] & ~0xff00 | (u8int)readm(r[3]++, 0) << 8; break;
case 0x42:
p = readm(r[3]++, 0);
if((ps & FLAGN) == 0)
r[2] = r[2] & ~0xff00 | p << 8;
break;
case 0x43:
p = readm(r[3]++, 0);
if((ps & FLAGN) != 0)
r[2] = r[2] & ~0xff00 | p << 8;
break;
case 0x44:
p = readm(r[3]++, 0);
if((ps & FLAGC) != 0)
writem(r[5]++, p, 0);
else
writem(r[5]++, r[2], 0);
break;
case 0x45:
p = readm(r[3]++, 0);
if((ps & FLAGZ) != 0){
r[5] -= p;
while(p-- != 0)
writem(r[5]++, r[2], 0);
}
break;
case 0x46:
p = readm(r[3]++, 0);
if((ps & (FLAGN|FLAGZ)) == (FLAGN|FLAGZ))
writem(r[5] - p, r[2], 0);
break;
case 0x47:
p = readm(r[3]++, 0);
if((u16int)r[0] > p){
r[0] = (u16int) r[0];
i = r[0] - p;
while(i-- > 0)
if(editread() != 0)
ps = ps & ~FLAGZ | FLAGV;
}else
r[0] = (u16int) r[0] | r[0] - p << 16;
case 0x80: case 0x81: case 0x82: case 0x83: case 0x84: case 0x85: case 0x86: case 0x87:
case 0x88: case 0x89: case 0x8a: case 0x8b: case 0x8c: case 0x8d: case 0x8e: case 0x8f:
for(; p > 0x80; p--)
writem(r[5]++, r[2], 0);
break;
case 0x90: case 0x91: case 0x92: case 0x93: case 0x94: case 0x95: case 0x96: case 0x97:
case 0x98: case 0x99: case 0x9a: case 0x9b: case 0x9c: case 0x9d: case 0x9e: case 0x9f:
for(; p > 0x90; p--){
c = editread();
if(c != 0) ps = ps & ~FLAGZ | FLAGC;
if((ps & FLAGC) == 0)
writem(r[5]++, r[2], 0);
else
writem(r[5]++, '0' + c, 0);
}
break;
case 0xa0: case 0xa1: case 0xa2: case 0xa3: case 0xa4: case 0xa5: case 0xa6: case 0xa7:
case 0xa8: case 0xa9: case 0xaa: case 0xab: case 0xac: case 0xad: case 0xae: case 0xaf:
for(; p > 0xa0; p--){
c = editread();
if(c != 0){
if((ps & FLAGC) == 0)
writem(r[5]++, r[2] >> 8, 0);
ps = ps & ~FLAGZ | FLAGC;
}
if((ps & FLAGC) == 0)
writem(r[5]++, r[2], 0);
else
writem(r[5]++, '0' + c, 0);
}
break;
default: sysfatal("editpc: unknown pattern %.2x (pc=%.8ux)", p, curpc);
}
}
}
void
movp(void)
{
u16int l;
u32int sa, da;
u8int c, d;
int i, n;
l = readm(amode(1), 1);
sa = addrof(amode(0));
da = addrof(amode(1));
n = l/2 + 1;
ps = ps & ~(FLAGN|FLAGV) | FLAGZ;
for(i = 0; i < n-1; i++){
c = readm(sa++, 0);
writem(da++, c, 0);
if(c != 0) ps &= ~FLAGZ;
}
c = readm(sa, 0);
if((c & 0xf0) != 0) ps &= ~FLAGZ;
d = c & 0xf0;
c &= 0xf;
if(c == 11 || c == 13) ps |= FLAGN;
if((ps & (FLAGN|FLAGZ)) == (FLAGN|FLAGZ)) ps &= ~FLAGN;
if((ps & FLAGN) != 0) d |= 13;
else d |= 12;
writem(da, d, 0);
}
static int
cmpmag(u16int l1, u32int a1, u16int l2, u32int a2)
{
int i;
u8int c1, c2;
for(i = l1 > l2 ? l1 : l2; --i >= 0; ){
c1 = getdig(l1, a1, i);
c2 = getdig(l2, a2, i);
if(c1 > c2) return 1;
if(c1 < c2) return -1;
}
return 0;
}
void
addp(int rn, int sub)
{
u16int l1, l2, l3;
u32int a1, a2, a3;
s8int s1, s2;
int c, i, l, t;
l1 = readm(amode(1), 1);
a1 = addrof(amode(0));
l2 = readm(amode(1), 1);
a2 = addrof(amode(0));
if(rn == 6){
l3 = readm(amode(1), 1);
a3 = addrof(amode(0));
}else{
l3 = l2;
a3 = a2;
}
s1 = getsign(l1, a1);
s2 = getsign(l2, a2);
r[0] = 0;
r[1] = sigdig(l1, a1);
r[2] = 0;
r[3] = sigdig(l2, a2);
r[4] = 0;
if(sub) s1 ^= -2;
if(s1 == s2){
c = 0;
l = l1;
if(l2 > l) l = l2;
if(l3 > l) l = l3;
for(i = 0; i < l; i++){
t = c + getdig(l1, a1, i) + getdig(l2, a2, i);
for(c = 0; t >= 10; c++) t -= 10;
putdig(l3, a3, i, t);
}
}else{
if(cmpmag(l1, a1, l2, a2) < 0){
t = l1; l1 = l2; l2 = t;
t = a1; a1 = a2; a2 = t;
s1 = s2;
}
c = 0;
l = l3 > l1 ? l3 : l1;
for(i = 0; i < l; i++){
t = getdig(l1, a1, i) - getdig(l2, a2, i);
for(c = 0; t < 0; c++) t += 10;
putdig(l3, a3, i, t);
}
}
if(c != 0) ps |= FLAGV;
putsign(l3, a3, s1);
r[5] = sigdig(l3, a3);
}
void
cmpp(int rn)
{
u16int l1, l2;
u32int a1, a2;
s8int s1, s2;
int rc;
l1 = readm(amode(1), 1);
a1 = addrof(amode(0));
if(rn == 4)
l2 = readm(amode(1), 1);
else
l2 = l1;
a2 = addrof(amode(0));
s1 = getsign(l1, a1);
s2 = getsign(l2, a2);
r[0] = 0;
r[1] = sigdig(l1, a1);
r[2] = 0;
r[3] = sigdig(l2, a2);
ps &= ~15;
if(s1 != s2){
if(s1 < s2) ps |= FLAGN;
return;
}
rc = cmpmag(l1, a1, l2, a2);
if(rc == 0) ps |= FLAGZ;
else if(rc > 0) ps |= FLAGN;
}
void
ashp(void)
{
s8int cnt, rnd;
s16int sl, dl;
u32int sa, da;
int i, c, x;
cnt = readm(amode(0), 0);
sl = readm(amode(1), 1);
sa = addrof(amode(2));
rnd = readm(amode(0), 0);
dl = readm(amode(1), 1);
da = addrof(amode(2));
ps = ps & ~15 | FLAGZ;
x = getsign(sl, sa);
if(x < 0) ps |= FLAGN;
putsign(dl, da, x);
for(i = 0; i < cnt; i++)
putdig(dl, da, i, 0);
c = cnt < 0 && getdig(sl, sa, -1-cnt) >= rnd;
for(i = cnt >= 0 ? 0 : -cnt; i < sl; i++){
x = getdig(sl, sa, i) + c;
for(c = 0; x >= 10; c++) x -= 10;
putdig(dl, da, i + cnt, x);
if(x != 0) ps &= ~FLAGZ;
}
putdig(dl, da, i + cnt, c);
r[0] = 0;
r[1] = sigdig(sl, sa);
r[2] = 0;
r[3] = sigdig(dl, da);
}
void
locc(int inv)
{
u8int chr;
u16int len;
u32int addr;
chr = readm(amode(0), 0);
len = readm(amode(1), 1);
addr = addrof(amode(0));
ps &= ~15;
for(; len != 0; addr++, len--)
if(inv ^ (readm(addr, 0) == chr))
break;
if(len == 0) ps |= FLAGZ;
r[0] = len;
r[1] = addr;
}
void
cmpc(int op5)
{
u16int l1, l2;
u32int a1, a2;
u8int a, b, f;
if(op5){
l1 = readm(amode(1), 1);
a1 = addrof(amode(2));
f = readm(amode(0), 0);
l2 = readm(amode(1), 1);
a2 = addrof(amode(2));
}else{
l1 = l2 = readm(amode(1), 1);
a1 = addrof(amode(2));
a2 = addrof(amode(2));
f = 0;
}
a = b = f;
for(; l1 > 0 && l2 > 0; l1--, l2--, a1++, a2++){
a = readm(a1, 0);
b = readm(a2, 0);
if(a != b) goto ineq;
}
for(; l1 > 0; l1--, a1++){
a = readm(a1, 0);
b = f;
if(a != b) goto ineq;
}
for(; l2 > 0; l2--, a2++){
a = f;
b = readm(a2, 0);
if(a != b) goto ineq;
}
ineq:
ps = ps & ~15;
if((s8int)a < (s8int)b) ps |= FLAGN;
if(a == b) ps |= FLAGZ;
if(a < b) ps |= FLAGC;
r[0] = l1;
r[1] = a1;
r[2] = l2;
r[3] = a2;
}
void
movc(int op5)
{
u16int sl, dl, l;
u32int sa, da;
int i;
u8int f;
sl = readm(amode(1), 1);
sa = addrof(amode(0));
if(op5){
f = readm(amode(0), 0);
dl = readm(amode(1), 1);
}else{
f = 0;
dl = sl;
}
da = addrof(amode(0));
l = sl < dl ? sl : dl;
if(sa < da)
for(i = l; --i >= 0; )
writem(da + i, readm(sa + i, 0), 0);
else
for(i = 0; i < l; i++)
writem(da + i, readm(sa + i, 0), 0);
for(i = l; i < dl; i++)
writem(da + i, f, 0);
r[0] = sl - l;
r[1] = sa + sl;
r[2] = 0;
r[3] = da + dl;
r[4] = 0;
r[5] = 0;
ps &= ~15;
if((s16int) sl < (s16int) dl) ps |= FLAGN;
else if(sl == dl) ps |= FLAGZ;
if(sl < dl) ps |= FLAGC;
}