FreeFOAM The Cross-Platform CFD Toolkit
readHexLabel.C
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23 
24 Description
25  Read of a non-delimited hex label
26 
27 \*---------------------------------------------------------------------------*/
28 
29 #include <OpenFOAM/readHexLabel.H>
30 
31 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
32 
33 Foam::label Foam::readHexLabel(ISstream& is)
34 {
35  // Takes into account that 'a' (or 'A') is 10
36  static const label alphaOffset = toupper('A') - 10;
37  // Takes into account that '0' is 0
38  static const label zeroOffset = int('0');
39 
40  char c = 0;
41 
42  // Get next non-whitespace character
43  while (is.get(c) && isspace(c))
44  {}
45 
46  register label result = 0;
47  do
48  {
49  if (isspace(c) || c == 0) break;
50 
51  if (!isxdigit(c))
52  {
53  FatalIOErrorIn("readHexLabel(ISstream&)", is)
54  << "Illegal hex digit: '" << c << "'"
55  << exit(FatalIOError);
56  }
57 
58  result *= 16;
59 
60  if (isdigit(c))
61  {
62  result += int(c) - zeroOffset;
63  }
64  else
65  {
66  result += toupper(c) - alphaOffset;
67  }
68  } while (is.get(c));
69 
70  return result;
71 }
72 
73 
74 // ************************ vim: set sw=4 sts=4 et: ************************ //