Manpages - iswctype.3p

This manual page is part of the POSIX Programmer’s Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

iswctype, iswctype_l — test character for a specified class

  #include <wctype.h>
  int iswctype(wint_t wc, wctype_t charclass);
  int iswctype_l(wint_t wc, wctype_t charclass,
      locale_t locale);

For /iswctype/(): The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1‐2017 defers to the ISO C standard.

The iswctype/() and /iswctype_l/() functions shall determine whether the wide-character code /wc has the character class charclass, returning true or false. The /iswctype/() and /iswctype_l/() functions are defined on WEOF and wide-character codes corresponding to the valid character encodings in the current locale, or in the locale represented by locale, respectively. If the wc argument is not in the domain of the function, the result is undefined. If the value of charclass is invalid (that is, not obtained by a call to wctype/() or /charclass is invalidated by a subsequent call to setlocale/() that has affected category /LC_CTYPE) the result is unspecified.

The behavior is undefined if the locale argument to /iswctype_l/() is the special locale object LC_GLOBAL_LOCALE or is not a valid locale object handle.

The iswctype/() and /iswctype_l/() functions shall return non-zero (true) if and only if /wc has the property described by charclass. If charclass is ( wctype_t)0, these functions shall return 0.

No errors are defined.

The following sections are informative.

The twelve strings “alnum”, “alpha”, “blank”, “cntrl”, “digit”, “graph”, “lower”, “print”, “punct”, “space”, “upper”, and “xdigit” are reserved for the standard character classes. In the table below, the functions in the left column are equivalent to the functions in the right column.

    iswalnum(wc)            iswctype(wc, wctype("alnum"))
    iswalnum_l(wc, locale)  iswctype_l(wc, wctype("alnum"), locale)
    iswalpha(wc)            iswctype(wc, wctype("alpha"))
    iswalpha_l(wc, locale)  iswctype_l(wc, wctype("alpha"), locale)
    iswblank(wc)            iswctype(wc, wctype("blank"))
    iswblank_l(wc, locale)  iswctype_l(wc, wctype("blank"), locale)
    iswcntrl(wc)            iswctype(wc, wctype("cntrl"))
    iswcntrl_l(wc, locale)  iswctype_l(wc, wctype("cntrl"), locale)
    iswdigit(wc)            iswctype(wc, wctype("digit"))
    iswdigit_l(wc, locale)  iswctype_l(wc, wctype("digit"), locale)
    iswgraph(wc)            iswctype(wc, wctype("graph"))
    iswgraph_l(wc, locale)  iswctype_l(wc, wctype("graph"), locale)
    iswlower(wc)            iswctype(wc, wctype("lower"))
    iswlower_l(wc, locale)  iswctype_l(wc, wctype("lower"), locale)
    iswprint(wc)            iswctype(wc, wctype("print"))
    iswprint_l(wc, locale)  iswctype_l(wc, wctype("print"), locale)
    iswpunct(wc)            iswctype(wc, wctype("punct"))
    iswpunct_l(wc, locale)  iswctype_l(wc, wctype("punct"), locale)
    iswspace(wc)            iswctype(wc, wctype("space"))
    iswspace_l(wc, locale)  iswctype_l(wc, wctype("space"), locale)
    iswupper(wc)            iswctype(wc, wctype("upper"))
    iswupper_l(wc, locale)  iswctype_l(wc, wctype("upper"), locale)
    iswxdigit(wc)           iswctype(wc, wctype("xdigit"))
    iswxdigit_l(wc, locale) iswctype_l(wc, wctype("xdigit"), locale)

None.

None.

/iswalnum ( )/, /iswalpha ( )/, /iswcntrl ( )/, /iswdigit ( )/, /iswgraph ( )/, /iswlower ( )/, /iswprint ( )/, /iswpunct ( )/, /iswspace ( )/, /iswupper ( )/, /iswxdigit ( )/, /setlocale ( )/, /uselocale ( )/, /wctype ( )/

The Base Definitions volume of POSIX.1‐2017, <locale.h>, <wctype.h>

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology – Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

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