table of contents
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);
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¶
2023-03-30 | Linux man-pages 6.04 |