functions:
  iswalnum:
    c-definition: 7.32.2.1.1
  iswalpha:
    c-definition: 7.32.2.1.2
  iswblank:
    c-definition: 7.32.2.1.4
  iswctype:
    c-definition: 7.32.2.2.1
  iswdigit:
    c-definition: 7.32.2.1.5
  iswgraph:
    c-definition: 7.32.2.1.6
  iswlower:
    c-definition: 7.32.2.1.7
  iswprint:
    c-definition: 7.32.2.1.8
  iswpunct:
    c-definition: 7.32.2.1.9
  iswspace:
    c-definition: 7.32.2.1.10
  iswupper:
    c-definition: 7.32.2.1.11
  iswxdigit:
    c-definition: 7.32.2.1.12
  towctrans:
    c-definition: 7.32.3.2.1
  towlower:
    c-definition: 7.32.3.1.1
  towupper:
    c-definition: 7.32.3.1.2
  wctrans:
    c-definition: 7.32.3.2.2
  wctype:
    c-definition: 7.32.2.2.2