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/*
* Copyright (C) 2000 Manuel Novoa III
*
* Note: buf is a pointer to the END of the buffer passed.
* Call like this:
* char buf[SIZE], *p;
* p = __ulltostr(buf + sizeof(buf) - 1, ...)
*
* For long longs of 64 bits, appropriate buffer sizes are:
* base = 2 65 = 64 digits + 1 nul
* base = 10 20 = 19 digits + 1 nul
* base = 16 17 = 16 hex digits + 1 nul
*/
char *__ulltostr(char *buf, unsigned long long uval, int base, int uppercase)
{
int digit;
if ((base < 2) || (base > 36)) {
return 0;
}
*buf = '\0';
do {
digit = uval % base;
uval /= base;
/* note: slightly slower but generates less code */
*--buf = '0' + digit;
if (digit > 9) {
*buf = (uppercase ? 'A' : 'a') + digit - 10;
}
} while (uval);
return buf;
}
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