towlower(3) - Linux manual page (original) (raw)

towlower(3) Library Functions Manual towlower(3)

NAME top

   towlower, towlower_l - convert a wide character to lowercase

LIBRARY top

   Standard C library (_libc_, _-lc_)

SYNOPSIS top

   **#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 top

   The **towlower**() function is the wide-character equivalent of the
   [tolower(3)](../man3/tolower.3.html) 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)](../man3/duplocale.3.html)) or is not a valid locale object handle.

   The argument _wc_ must be representable as a _wchart_ and be a valid
   character in the locale or be the value **WEOF**.

RETURN VALUE top

   If _wc_ was convertible to lowercase, **towlower**() returns its
   lowercase equivalent; otherwise it returns _wc_.

ATTRIBUTES top

   For an explanation of the terms used in this section, see
   [attributes(7)](../man7/attributes.7.html).
   ┌───────────────────────────────┬───────────────┬────────────────┐
   │ **Interface** │ **Attribute** │ **Value** │
   ├───────────────────────────────┼───────────────┼────────────────┤
   │ **towlower**()                    │ Thread safety │ MT-Safe locale │
   ├───────────────────────────────┼───────────────┼────────────────┤
   │ **towlower_l**()                  │ Thread safety │ MT-Safe        │
   └───────────────────────────────┴───────────────┴────────────────┘

STANDARDS top

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

   **towlower_l**()
          POSIX.1-2008.

STANDARDS top

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

   **towlower_l**()
          glibc 2.3.  POSIX.1-2008.

NOTES top

   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 top

   [iswlower(3)](../man3/iswlower.3.html), [towctrans(3)](../man3/towctrans.3.html), [towupper(3)](../man3/towupper.3.html), [locale(7)](../man7/locale.7.html)

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Linux man-pages 6.10 2024-07-23 towlower(3)

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