towupper(3)

1towupper(3)                Library Functions Manual                towupper(3)
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NAME

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

9       Standard C library (libc, -lc)
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SYNOPSIS

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

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

41       If  wc  was  convertible to uppercase, towupper() returns its uppercase
42       equivalent; otherwise it returns wc.
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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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STANDARDS

57       towupper()
58              C11, POSIX.1-2008 (XSI).
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60       towupper_l()
61              POSIX.1-2008.
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HISTORY

64       towupper()
65              C99, POSIX.1-2001 (XSI).  Obsolete in POSIX.1-2008 (XSI).
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67       towupper_l()
68              POSIX.1-2008.  glibc 2.3.
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NOTES

71       The behavior of these functions depends on the LC_CTYPE category of the
72       locale.
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74       These functions are not very appropriate for dealing with Unicode char‐
75       acters,  because Unicode knows about three cases: upper, lower, and ti‐
76       tle case.
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