towupper(3)

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

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

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

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

38       If  wc  was  convertible to uppercase, towupper() returns its uppercase
39       equivalent; otherwise it returns wc.
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VERSIONS

42       The towupper_l() function first appeared in glibc 2.3.
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ATTRIBUTES

45       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
46       tributes(7).
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48       ┌─────────────────────────────────────┬───────────────┬────────────────┐
49       │Interface                            │ Attribute     │ Value          │
50       ├─────────────────────────────────────┼───────────────┼────────────────┤
51       │towupper()                           │ Thread safety │ MT-Safe locale │
52       ├─────────────────────────────────────┼───────────────┼────────────────┤
53       │towupper_l()                         │ Thread safety │ MT-Safe        │
54       └─────────────────────────────────────┴───────────────┴────────────────┘
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CONFORMING TO

57       towupper():  C99,  POSIX.1-2001  (XSI);  present as an XSI extension in
58       POSIX.1-2008, but marked obsolete.
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60       towupper_l(): POSIX.1-2008.
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NOTES

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

74       This  page  is  part of release 5.13 of the Linux man-pages project.  A
75       description of the project, information about reporting bugs,  and  the
76       latest     version     of     this    page,    can    be    found    at
77       https://www.kernel.org/doc/man-pages/.
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81GNU                               2021-03-22                       TOWUPPER(3)