towlower

TOWLOWER(3)                Linux Programmer's Manual               TOWLOWER(3)



NAME
       towlower, towlower_l - convert a wide character to lowercase

SYNOPSIS
       #include <wctype.h>

       wint_t towlower(wint_t wc);

       wint_t towlower_l(wint_t wc, locale_t locale);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       towlower_l():
           Since glibc 2.10:
                  _XOPEN_SOURCE >= 700
           Before glibc 2.10:
                  _GNU_SOURCE

DESCRIPTION
       The towlower() function is the wide-character equivalent of the
       tolower(3) function.  If wc is an uppercase wide character, and there
       exists a lowercase equivalent in the current locale, it returns the
       lowercase equivalent of wc.  In all other cases, wc is returned
       unchanged.

       The towlower_l() function performs the same task, but performs the
       conversion based on the character type information in the locale
       specified by locale.  The behavior of towlower_l() is undefined if
       locale is the special locale object LC_GLOBAL_LOCALE (see duplocale(3))
       or is not a valid locale object handle.

       The argument wc must be representable as a wchar_t and be a valid
       character in the locale or be the value WEOF.

RETURN VALUE
       If wc was convertible to lowercase, towlower() returns its lowercase
       equivalent; otherwise it returns wc.

VERSIONS
       The towlower_l() function first appeared in glibc 2.3.

ATTRIBUTES
       For an explanation of the terms used in this section, see
       attributes(7).

       ┌─────────────┬───────────────┬────────────────┐
       │Interface    Attribute     Value          │
       ├─────────────┼───────────────┼────────────────┤
       │towlower()   │ Thread safety │ MT-Safe locale │
       ├─────────────┼───────────────┼────────────────┤
       │towlower_l() │ Thread safety │ MT-Safe        │
       └─────────────┴───────────────┴────────────────┘
CONFORMING TO
       towlower(): C99, POSIX.1-2001 (XSI); present as an XSI extension in
       POSIX.1-2008, but marked obsolete.

       towlower_l(): POSIX.1-2008.

NOTES
       The behavior of these functions depends on the LC_CTYPE category of the
       locale.

       These functions are not very appropriate for dealing with Unicode
       characters, because Unicode knows about three cases: upper, lower and
       title case.

SEE ALSO
       iswlower(3), towctrans(3), towupper(3), locale(7)

COLOPHON
       This page is part of release 5.05 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.



GNU                               2017-09-15                       TOWLOWER(3)