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