int do_intrev(int argc, char **argv) {
unsigned long n = 0;
if (argc > 2) {
n = atoi(argv[2]);
} else {
int c;
skipc(stdin, ' ');
while ((c = getc(stdin)) != EOF) {
if (c == '\n')
break;
if (c >= '0' && c <= '9') {
n *= 10;
n += c-'0';
}
}
}
if (n == 0) {
intrev_usage(argv[0]);
return -1;
}
printf("%ld\n", intreverse(n));
return 0;
}
Blk*
add(Blk *a1, Blk *a2)
{
Blk *p;
int carry, n, size, c, n1, n2;
size = length(a1)>length(a2)?length(a1):length(a2);
p = salloc(size);
rewind(a1);
rewind(a2);
carry=0;
while(--size >= 0) {
n1 = sfeof(a1)?0:sgetc(a1);
n2 = sfeof(a2)?0:sgetc(a2);
n = n1 + n2 + carry;
if(n>=100) {
carry=1;
n -= 100;
} else
if(n<0) {
carry = -1;
n += 100;
} else
carry = 0;
sputc(p,n);
}
if(carry != 0)
sputc(p,carry);
fsfile(p);
if(sfbeg(p) == 0) {
c = 0;
while(sfbeg(p) == 0 && (c = sbackc(p)) == 0)
;
if(c != 0)
salterc(p,c);
truncate(p);
}
fsfile(p);
if(sfbeg(p) == 0 && sbackc(p) == -1) {
while((c = sbackc(p)) == 99) {
if(c == -1)
break;
}
skipc(p);
salterc(p,-1);
truncate(p);
}
return(p);
}
Blk*
removc(Blk *p, int n)
{
Blk *q, *r;
rewind(p);
while(n>1) {
skipc(p);
n -= 2;
}
q = salloc(2);
while(sfeof(p) == 0)
sputc(q,sgetc(p));
if(n == 1) {
r = div(q,tenptr);
release(q);
release(rem);
q = r;
}
release(p);
return(q);
}