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2TOWUPPER(3)                Linux Programmer's Manual               TOWUPPER(3)
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NAME

7       towupper, towupper_l - convert a wide character to uppercase
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SYNOPSIS

10       #include <wctype.h>
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12       wint_t towupper(wint_t wc);
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14       wint_t towupper_l(wint_t wc, locale_t locale);
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16   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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18       towupper_l():
19           Since glibc 2.10:
20                  _XOPEN_SOURCE >= 700
21           Before glibc 2.10:
22                  _GNU_SOURCE
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DESCRIPTION

25       The  towupper()  function is the wide-character equivalent of the toup‐
26       per(3) function.  If wc is a lowercase wide character, and there exists
27       an uppercase equivalent in the current locale, it returns the uppercase
28       equivalent of wc.  In all other cases, wc is returned unchanged.
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30       The towupper_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 towupper_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 uppercase, towupper() returns its uppercase
41       equivalent; otherwise it returns wc.
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VERSIONS

44       The towupper_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       │towupper()   │ Thread safety │ MT-Safe locale │
54       ├─────────────┼───────────────┼────────────────┤
55       │towupper_l() │ Thread safety │ MT-Safe        │
56       └─────────────┴───────────────┴────────────────┘

CONFORMING TO

58       towupper():  C99,  POSIX.1-2001  (XSI);  present as an XSI extension in
59       POSIX.1-2008, but marked obsolete.
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61       towupper_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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SEE ALSO

72       iswupper(3), towctrans(3), towlower(3), locale(7)
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COLOPHON

75       This  page  is  part of release 4.16 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                       TOWUPPER(3)
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