1TOUPPER(3P) POSIX Programmer's Manual TOUPPER(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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13 toupper, toupper_l — transliterate lowercase characters to uppercase
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16 #include <ctype.h>
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18 int toupper(int c);
19 int toupper_l(int c, locale_t locale);
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22 For toupper(): 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.1‐2008 defers to the ISO C standard.
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27 The toupper() and toupper_l() functions have as a domain a type int,
28 the value of which is representable as an unsigned char or the value of
29 EOF. If the argument has any other value, the behavior is undefined.
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31 If the argument of toupper() or toupper_l() represents a lowercase let‐
32 ter, and there exists a corresponding uppercase letter as defined by
33 character type information in the current locale or in the locale rep‐
34 resented by locale, respectively (category LC_CTYPE), the result shall
35 be the corresponding uppercase letter.
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37 All other arguments in the domain are returned unchanged.
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39 The behavior is undefined if the locale argument to toupper_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, toupper() and toupper_l() shall return the
45 uppercase letter corresponding to the argument passed; otherwise, they
46 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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63 None.
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66 setlocale(), uselocale()
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68 The Base Definitions volume of POSIX.1‐2008, Chapter 7, Locale,
69 <ctype.h>, <locale.h>
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72 Portions of this text are reprinted and reproduced in electronic form
73 from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
74 -- Portable Operating System Interface (POSIX), The Open Group Base
75 Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
76 cal and Electronics Engineers, Inc and The Open Group. (This is
77 POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
78 event of any discrepancy between this version and the original IEEE and
79 The Open Group Standard, the original IEEE and The Open Group Standard
80 is the referee document. The original Standard can be obtained online
81 at http://www.unix.org/online.html .
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83 Any typographical or formatting errors that appear in this page are
84 most likely to have been introduced during the conversion of the source
85 files to man page format. To report such errors, see https://www.ker‐
86 nel.org/doc/man-pages/reporting_bugs.html .
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90IEEE/The Open Group 2013 TOUPPER(3P)