ISWCTYPE(3)                POSIX Programmer's Manual               ISWCTYPE(3)



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

NNAAMMEE
       iswctype, iswctype_l -- test character for a specified class

SSYYNNOOPPSSIISS
       #include <wctype.h>

       int iswctype(wint_t _w_c, wctype_t _c_h_a_r_c_l_a_s_s);
       int iswctype_l(wint_t _w_c, wctype_t _c_h_a_r_c_l_a_s_s,
           locale_t _l_o_c_a_l_e);

DDEESSCCRRIIPPTTIIOONN
       For _i_s_w_c_t_y_p_e(): 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 _i_s_w_c_t_y_p_e() and _i_s_w_c_t_y_p_e___l() functions shall determine whether the
       wide-character code _w_c has the character class _c_h_a_r_c_l_a_s_s, returning
       true or false. The _i_s_w_c_t_y_p_e() and _i_s_w_c_t_y_p_e___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
       _l_o_c_a_l_e, respectively. If the _w_c argument is not in the domain of the
       function, the result is undefined.  If the value of _c_h_a_r_c_l_a_s_s is
       invalid (that is, not obtained by a call to _w_c_t_y_p_e() or _c_h_a_r_c_l_a_s_s is
       invalidated by a subsequent call to _s_e_t_l_o_c_a_l_e() that has affected
       category _L_C___C_T_Y_P_E) the result is unspecified.

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

RREETTUURRNN VVAALLUUEE
       The _i_s_w_c_t_y_p_e() and _i_s_w_c_t_y_p_e___l() functions shall return non-zero (true)
       if and only if _w_c has the property described by _c_h_a_r_c_l_a_s_s.  If
       _c_h_a_r_c_l_a_s_s is (wwccttyyppee__tt)0, these functions shall return 0.

EERRRROORRSS
       No errors are defined.

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

EEXXAAMMPPLLEESS
   TTeessttiinngg ffoorr aa VVaalliidd CChhaarraacctteerr
           #include <wctype.h>
           ...
           int yes_or_no;
           wint_t wc;
           wctype_t valid_class;
           ...
           if ((valid_class=wctype("vowel")) == (wctype_t)0)
               /* Invalid character class. */
           yes_or_no=iswctype(wc,valid_class);

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       The twelve strings ""aallnnuumm"", ""aallpphhaa"", ""bbllaannkk"", ""ccnnttrrll"", ""ddiiggiitt"",
       ""ggrraapphh"", ""lloowweerr"", ""pprriinntt"", ""ppuunncctt"", ""ssppaaccee"", ""uuppppeerr"", and ""xxddiiggiitt"" 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(_w_c)            iswctype(_w_c, wctype("alnum"))
           iswalnum_l(_w_c, _l_o_c_a_l_e)  iswctype_l(_w_c, wctype("alnum"), _l_o_c_a_l_e)
           iswalpha(_w_c)            iswctype(_w_c, wctype("alpha"))
           iswalpha_l(_w_c, _l_o_c_a_l_e)  iswctype_l(_w_c, wctype("alpha"), _l_o_c_a_l_e)
           iswblank(_w_c)            iswctype(_w_c, wctype("blank"))
           iswblank_l(_w_c, _l_o_c_a_l_e)  iswctype_l(_w_c, wctype("blank"), _l_o_c_a_l_e)
           iswcntrl(_w_c)            iswctype(_w_c, wctype("cntrl"))
           iswcntrl_l(_w_c, _l_o_c_a_l_e)  iswctype_l(_w_c, wctype("cntrl"), _l_o_c_a_l_e)
           iswdigit(_w_c)            iswctype(_w_c, wctype("digit"))
           iswdigit_l(_w_c, _l_o_c_a_l_e)  iswctype_l(_w_c, wctype("digit"), _l_o_c_a_l_e)
           iswgraph(_w_c)            iswctype(_w_c, wctype("graph"))
           iswgraph_l(_w_c, _l_o_c_a_l_e)  iswctype_l(_w_c, wctype("graph"), _l_o_c_a_l_e)
           iswlower(_w_c)            iswctype(_w_c, wctype("lower"))
           iswlower_l(_w_c, _l_o_c_a_l_e)  iswctype_l(_w_c, wctype("lower"), _l_o_c_a_l_e)
           iswprint(_w_c)            iswctype(_w_c, wctype("print"))
           iswprint_l(_w_c, _l_o_c_a_l_e)  iswctype_l(_w_c, wctype("print"), _l_o_c_a_l_e)
           iswpunct(_w_c)            iswctype(_w_c, wctype("punct"))
           iswpunct_l(_w_c, _l_o_c_a_l_e)  iswctype_l(_w_c, wctype("punct"), _l_o_c_a_l_e)
           iswspace(_w_c)            iswctype(_w_c, wctype("space"))
           iswspace_l(_w_c, _l_o_c_a_l_e)  iswctype_l(_w_c, wctype("space"), _l_o_c_a_l_e)
           iswupper(_w_c)            iswctype(_w_c, wctype("upper"))
           iswupper_l(_w_c, _l_o_c_a_l_e)  iswctype_l(_w_c, wctype("upper"), _l_o_c_a_l_e)
           iswxdigit(_w_c)           iswctype(_w_c, wctype("xdigit"))
           iswxdigit_l(_w_c, _l_o_c_a_l_e) iswctype_l(_w_c, wctype("xdigit"), _l_o_c_a_l_e)

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _i_s_w_a_l_n_u_m(), _i_s_w_a_l_p_h_a(), _i_s_w_c_n_t_r_l(), _i_s_w_d_i_g_i_t(), _i_s_w_g_r_a_p_h(), _i_s_w_l_o_w_e_r(),
       _i_s_w_p_r_i_n_t(), _i_s_w_p_u_n_c_t(), _i_s_w_s_p_a_c_e(), _i_s_w_u_p_p_e_r(), _i_s_w_x_d_i_g_i_t(),
       _s_e_t_l_o_c_a_l_e(), _u_s_e_l_o_c_a_l_e(), _w_c_t_y_p_e()

       The Base Definitions volume of POSIX.1-2017, <<llooccaallee..hh>>, <<wwccttyyppee..hh>>

CCOOPPYYRRIIGGHHTT
       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 .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                  2017                          ISWCTYPE(3)
