Plan 9 from Bell Labs’s /usr/web/sources/contrib/anothy/src/lib/djb-ape/byte/fmt_xlong.c

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
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#include "fmt.h"

unsigned int fmt_xlong(register char* s,register unsigned long u)
{
  register unsigned int len; register unsigned long q; register char c;
  len = 1; q = u;
  while (q > 15) { ++len; q /= 16; }
  if (s) {
    s += len;
    do { c = '0' + (u & 15); if (c > '0' + 9) c += 'a' - '0' - 10;
    *--s = c; u /= 16; } while(u);
  }
  return len;
}

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