1TOWLOWER(3P)               POSIX Programmer's Manual              TOWLOWER(3P)
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PROLOG

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

12       towlower, towlower_l — transliterate uppercase wide-character  code  to
13       lowercase
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SYNOPSIS

16       #include <wctype.h>
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18       wint_t towlower(wint_t wc);
19       wint_t towlower_l(wint_t wc, locale_t locale);
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DESCRIPTION

22       For  towlower():  The functionality described on this reference page is
23       aligned with the ISO C standard. Any conflict between the  requirements
24       described  here and the ISO C standard is unintentional. This volume of
25       POSIX.1‐2017 defers to the ISO C standard.
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27       The towlower() and towlower_l() functions  have  as  a  domain  a  type
28       wint_t,  the value of which the application shall ensure is a character
29       representable as a wchar_t, and a wide-character code corresponding  to
30       a  valid  character  in the locale used by the function or the value of
31       WEOF.  If the argument has any other value, the behavior is  undefined.
32       If  the  argument of towlower() or towlower_l() represents an uppercase
33       wide-character code, and there exists a corresponding  lowercase  wide-
34       character  code as defined by character type information in the current
35       locale or in the locale represented by locale,  respectively  (category
36       LC_CTYPE), the result shall be the corresponding lowercase wide-charac‐
37       ter code.  All other arguments in the domain are returned unchanged.
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39       The behavior is undefined if the locale argument to towlower_l() is the
40       special  locale object LC_GLOBAL_LOCALE or is not a valid locale object
41       handle.
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RETURN VALUE

44       Upon successful completion, the towlower() and  towlower_l()  functions
45       shall return the lowercase letter corresponding to the argument passed;
46       otherwise, they shall return the argument unchanged.
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ERRORS

49       No errors are defined.
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51       The following sections are informative.
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EXAMPLES

54       None.
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APPLICATION USAGE

57       None.
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RATIONALE

60       None.
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FUTURE DIRECTIONS

63       None.
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SEE ALSO

66       setlocale(), uselocale()
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68       The  Base  Definitions  volume  of  POSIX.1‐2017,  Chapter  7,  Locale,
69       <locale.h>, <wctype.h>
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72       Portions  of  this text are reprinted and reproduced in electronic form
73       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
74       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
75       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
76       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
77       event of any discrepancy between this version and the original IEEE and
78       The  Open Group Standard, the original IEEE and The Open Group Standard
79       is the referee document. The original Standard can be  obtained  online
80       at http://www.opengroup.org/unix/online.html .
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82       Any  typographical  or  formatting  errors that appear in this page are
83       most likely to have been introduced during the conversion of the source
84       files  to  man page format. To report such errors, see https://www.ker‐
85       nel.org/doc/man-pages/reporting_bugs.html .
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89IEEE/The Open Group                  2017                         TOWLOWER(3P)
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