text: /* wctype.h: declare several functions that are useful for classifying 
   * and mapping codes from the target wide-character set.
   */
  #ifndef _WCTYPE_
  #define _WCTYPE_
  
  #include <wchar.h>
  
  /* Types */
  typedef struct wctrans_t wctrans_t;
  
  /* Functions */
  int       iswalnum(wint_t);
  int       iswalpha(wint_t);
  int       iswblank(wint_t);
  int       iswcntrl(wint_t);
  int       iswdigit(wint_t);
  int       iswgraph(wint_t);
  int       iswlower(wint_t);
  int       iswprint(wint_t);
  int       iswpunct(wint_t);
  int       iswspace(wint_t);
  int       iswupper(wint_t);
  int       iswxdigit(wint_t);
  int       iswctype(wint_t, wctype_t);
  wint_t    towctrans(wint_t, wctrans_t);
  wint_t    towlower(wint_t);
  wint_t    towupper(wint_t);
  wctrans_t wctrans(const char *);
  wctype_t  wctype(const char *);
  
  #endif
  