towlower(3)

1TOWLOWER(3)                Linux Programmer's Manual               TOWLOWER(3)
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NAME

6       towlower, towlower_l - convert a wide character to lowercase
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SYNOPSIS

9       #include <wctype.h>
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11       wint_t towlower(wint_t wc);
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13       wint_t towlower_l(wint_t wc, locale_t locale);
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15   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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17       towlower_l():
18           Since glibc 2.10:
19                  _XOPEN_SOURCE >= 700
20           Before glibc 2.10:
21                  _GNU_SOURCE
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DESCRIPTION

24       The  towlower()  function  is  the  wide-character  equivalent  of  the
25       tolower(3) function.  If wc is an uppercase wide character,  and  there
26       exists  a  lowercase  equivalent  in the current locale, it returns the
27       lowercase equivalent of  wc.   In  all  other  cases,  wc  is  returned
28       unchanged.
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30       The towlower_l() function performs the same task, but performs the con‐
31       version based on the character type information in the locale specified
32       by  locale.  The behavior of towlower_l() is undefined if locale is the
33       special locale object LC_GLOBAL_LOCALE (see duplocale(3)) or is  not  a
34       valid locale object handle.
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36       The argument wc must be representable as a wchar_t and be a valid char‐
37       acter in the locale or be the value WEOF.
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RETURN VALUE

40       If wc was convertible to lowercase, towlower()  returns  its  lowercase
41       equivalent; otherwise it returns wc.
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VERSIONS

44       The towlower_l() function first appeared in glibc 2.3.
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ATTRIBUTES

47       For   an   explanation   of   the  terms  used  in  this  section,  see
48       attributes(7).
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50       ┌─────────────┬───────────────┬────────────────┐
51       │Interface    │ Attribute     │ Value          │
52       ├─────────────┼───────────────┼────────────────┤
53       │towlower()   │ Thread safety │ MT-Safe locale │
54       ├─────────────┼───────────────┼────────────────┤
55       │towlower_l() │ Thread safety │ MT-Safe        │
56       └─────────────┴───────────────┴────────────────┘

CONFORMING TO

58       towlower(): C99, POSIX.1-2001 (XSI); present as  an  XSI  extension  in
59       POSIX.1-2008, but marked obsolete.
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61       towlower_l(): POSIX.1-2008.
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NOTES

64       The behavior of these functions depends on the LC_CTYPE category of the
65       locale.
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67       These functions are not very appropriate for dealing with Unicode char‐
68       acters, because Unicode knows about three cases: upper, lower and title
69       case.
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COLOPHON

75       This page is part of release 5.02 of the Linux  man-pages  project.   A
76       description  of  the project, information about reporting bugs, and the
77       latest    version    of    this    page,    can     be     found     at
78       https://www.kernel.org/doc/man-pages/.
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82GNU                               2017-09-15                       TOWLOWER(3)