1TOWUPPER(3P) POSIX Programmer's Manual TOWUPPER(3P)
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6 This manual page is part of the POSIX Programmer's Manual. The Linux
7 implementation of this interface may differ (consult the corresponding
8 Linux manual page for details of Linux behavior), or the interface may
9 not be implemented on Linux.
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12 towupper, towupper_l — transliterate lowercase wide-character code to
13 uppercase
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16 #include <wctype.h>
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18 wint_t towupper(wint_t wc);
19 wint_t towupper_l(wint_t wc, locale_t locale);
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22 For towupper(): The functionality described on this reference page is
23 aligned with the ISO C standard. Any conflict between the requirements
24 described here and the ISO C standard is unintentional. This volume of
25 POSIX.1‐2017 defers to the ISO C standard.
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27 The towupper() and towupper_l() functions have as a domain a type
28 wint_t, the value of which the application shall ensure is a character
29 representable as a wchar_t, and a wide-character code corresponding to
30 a valid character in the locale used by the function or the value of
31 WEOF. If the argument has any other value, the behavior is undefined.
32 If the argument of towupper() or towupper_l() represents a lowercase
33 wide-character code, and there exists a corresponding uppercase wide-
34 character code as defined by character type information in the current
35 locale or in the locale represented by locale, respectively (category
36 LC_CTYPE), the result shall be the corresponding uppercase wide-charac‐
37 ter code. All other arguments in the domain are returned unchanged.
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39 The behavior is undefined if the locale argument to towupper_l() is the
40 special locale object LC_GLOBAL_LOCALE or is not a valid locale object
41 handle.
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44 Upon successful completion, the towupper() and towupper_l() functions
45 shall return the uppercase letter corresponding to the argument passed.
46 Otherwise, they shall return the argument unchanged.
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49 No errors are defined.
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51 The following sections are informative.
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54 None.
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57 None.
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60 None.
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63 None.
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66 setlocale(), uselocale()
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68 The Base Definitions volume of POSIX.1‐2017, Chapter 7, Locale,
69 <locale.h>, <wctype.h>
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72 Portions of this text are reprinted and reproduced in electronic form
73 from IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
74 table Operating System Interface (POSIX), The Open Group Base Specifi‐
75 cations Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of
76 Electrical and Electronics Engineers, Inc and The Open Group. In the
77 event of any discrepancy between this version and the original IEEE and
78 The Open Group Standard, the original IEEE and The Open Group Standard
79 is the referee document. The original Standard can be obtained online
80 at http://www.opengroup.org/unix/online.html .
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82 Any typographical or formatting errors that appear in this page are
83 most likely to have been introduced during the conversion of the source
84 files to man page format. To report such errors, see https://www.ker‐
85 nel.org/doc/man-pages/reporting_bugs.html .
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89IEEE/The Open Group 2017 TOWUPPER(3P)