towlower(3) — Linux manual page

towlower(3)             Library Functions Manual             towlower(3)

NAME

       towlower, towlower_l - convert a wide character to lowercase

LIBRARY

       Standard C library (libc, -lc)

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.

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        │
       └──────────────────────────────┴───────────────┴────────────────┘

STANDARDS

       towlower()
              C11, POSIX.1-2008 (XSI).

       towlower_l()
              POSIX.1-2008.

STANDARDS

       towlower()
              C99, POSIX.1-2001 (XSI).  Obsolete in POSIX.1-2008 (XSI).

       towlower_l()
              glibc 2.3.  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

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Linux man-pages 6.9.1          2024-05-02                    towlower(3)

Pages that refer to this page: iswlower(3), toupper(3), towctrans(3), towupper(3), wcscasecmp(3), wcsncasecmp(3)

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