зеркало из https://github.com/github/putty.git
80 строки
1.4 KiB
C
80 строки
1.4 KiB
C
/*
|
|
* Handling of the int64 and uint64 types. Done in 32-bit integers,
|
|
* for (pre-C99) portability. Hopefully once C99 becomes widespread
|
|
* we can kiss this lot goodbye...
|
|
*/
|
|
|
|
#include <assert.h>
|
|
#include <string.h>
|
|
|
|
#include "int64.h"
|
|
|
|
uint64 uint64_div10(uint64 x, int *remainder)
|
|
{
|
|
uint64 y;
|
|
int rem, r2;
|
|
y.hi = x.hi / 10;
|
|
y.lo = x.lo / 10;
|
|
rem = x.lo % 10;
|
|
/*
|
|
* Now we have to add in the remainder left over from x.hi.
|
|
*/
|
|
r2 = x.hi % 10;
|
|
y.lo += r2 * 2 * (0x80000000 / 10);
|
|
rem += r2 * 2 * (0x80000000 % 10);
|
|
y.lo += rem / 10;
|
|
rem %= 10;
|
|
|
|
if (remainder)
|
|
*remainder = rem;
|
|
return y;
|
|
}
|
|
|
|
void uint64_decimal(uint64 x, char *buffer)
|
|
{
|
|
char buf[20];
|
|
int start = 20;
|
|
int d;
|
|
|
|
do {
|
|
x = uint64_div10(x, &d);
|
|
assert(start > 0);
|
|
buf[--start] = d + '0';
|
|
} while (x.hi || x.lo);
|
|
|
|
memcpy(buffer, buf + start, sizeof(buf) - start);
|
|
buffer[sizeof(buf) - start] = '\0';
|
|
}
|
|
|
|
uint64 uint64_make(unsigned long hi, unsigned long lo)
|
|
{
|
|
uint64 y;
|
|
y.hi = hi;
|
|
y.lo = lo;
|
|
return y;
|
|
}
|
|
|
|
uint64 uint64_add(uint64 x, uint64 y)
|
|
{
|
|
x.lo += y.lo;
|
|
x.hi += y.hi + (x.lo < y.lo ? 1 : 0);
|
|
return x;
|
|
}
|
|
|
|
uint64 uint64_add32(uint64 x, unsigned long y)
|
|
{
|
|
uint64 yy;
|
|
yy.hi = 0;
|
|
yy.lo = y;
|
|
return uint64_add(x, yy);
|
|
}
|
|
|
|
int uint64_compare(uint64 x, uint64 y)
|
|
{
|
|
if (x.hi != y.hi)
|
|
return x.hi < y.hi ? -1 : +1;
|
|
if (x.lo != y.lo)
|
|
return x.lo < y.lo ? -1 : +1;
|
|
return 0;
|
|
}
|