Name
towlower, towlower_l - convert a wide character to lowercaseLibrary
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 ofwc. 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 returnswc. Attributes
For an explanation of the terms used in this section, see attributes(7).| Interface | Attribute | Value |
| T} | Thread safety | MT-Safe locale |
| T} | 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.