Plan 9 from Bell Labs’s /usr/web/sources/contrib/anothy/src/lib/djb-ape/byte/scan_0x.c

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

long int fromhex(unsigned char c) {
  if (c>='0' && c<='9')
    return c-'0';
  else if (c>='A' && c<='F')
    return c-'A'+10;
  else if (c>='a' && c<='f')
    return c-'a'+10;
  return -1;
}

unsigned int scan_0x(register const char *s,register unsigned int *u)
{
  register unsigned int pos = 0;
  register unsigned long result = 0;
  register long int c;
  while ((c = fromhex((unsigned char) (s[pos]))) >= 0) {
    result = (result << 4) + c;
    ++pos;
  }
  *u = result;
  return pos;
}

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