TOWLOWER(3)                POSIX Programmer's Manual               TOWLOWER(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
       towlower, towlower_l -- transliterate uppercase wide-character code to
       lowercase

SSYYNNOOPPSSIISS
       #include <wctype.h>

       wint_t towlower(wint_t _w_c);
       wint_t towlower_l(wint_t _w_c, locale_t _l_o_c_a_l_e);

DDEESSCCRRIIPPTTIIOONN
       For _t_o_w_l_o_w_e_r(): 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 _t_o_w_l_o_w_e_r() and _t_o_w_l_o_w_e_r___l() functions have as a domain a type
       wwiinntt__tt, the value of which the application shall ensure is a character
       representable as a wwcchhaarr__tt, and a wide-character code corresponding to
       a valid character in the locale used by the function or the value of
       WEOF.  If the argument has any other value, the behavior is undefined.
       If the argument of _t_o_w_l_o_w_e_r() or _t_o_w_l_o_w_e_r___l() represents an uppercase
       wide-character code, and there exists a corresponding lowercase wide-
       character code as defined by character type information in the current
       locale or in the locale represented by _l_o_c_a_l_e, respectively (category
       _L_C___C_T_Y_P_E), the result shall be the corresponding lowercase wide-
       character code.  All other arguments in the domain are returned
       unchanged.

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

RREETTUURRNN VVAALLUUEE
       Upon successful completion, the _t_o_w_l_o_w_e_r() and _t_o_w_l_o_w_e_r___l() functions
       shall return the lowercase letter corresponding to the argument passed;
       otherwise, they shall return the argument unchanged.

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
       None.

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       None.

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _s_e_t_l_o_c_a_l_e(), _u_s_e_l_o_c_a_l_e()

       The Base Definitions volume of POSIX.1-2017, _C_h_a_p_t_e_r _7, _L_o_c_a_l_e,
       <<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                          TOWLOWER(3)
