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

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

unsigned int scan_ulong(register const char *s,register unsigned long *u)
{
  register unsigned int pos = 0;
  register unsigned long result = 0;
  register unsigned long c;
  while ((c = (unsigned long) (unsigned char) (s[pos] - '0')) < 10) {
    result = result * 10 + c;
    ++pos;
  }
  *u = result;
  return pos;
}

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