1_TOUPPER(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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12 _toupper — transliterate lowercase characters to uppercase
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15 #include <ctype.h>
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17 int _toupper(int c);
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20 The _toupper() macro shall be equivalent to toupper() except that the
21 application shall ensure that the argument c is a lowercase letter.
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24 Upon successful completion, _toupper() shall return the uppercase let‐
25 ter corresponding to the argument passed.
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28 No errors are defined.
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30 The following sections are informative.
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33 None.
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36 Applications should use the toupper() function instead of the obsoles‐
37 cent _toupper() function.
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40 None.
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43 The _toupper() function may be removed in a future version.
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46 islower(), toupper()
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48 The Base Definitions volume of POSIX.1‐2017, Chapter 7, Locale,
49 <ctype.h>
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52 Portions of this text are reprinted and reproduced in electronic form
53 from IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
54 table Operating System Interface (POSIX), The Open Group Base Specifi‐
55 cations Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of
56 Electrical and Electronics Engineers, Inc and The Open Group. In the
57 event of any discrepancy between this version and the original IEEE and
58 The Open Group Standard, the original IEEE and The Open Group Standard
59 is the referee document. The original Standard can be obtained online
60 at http://www.opengroup.org/unix/online.html .
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62 Any typographical or formatting errors that appear in this page are
63 most likely to have been introduced during the conversion of the source
64 files to man page format. To report such errors, see https://www.ker‐
65 nel.org/doc/man-pages/reporting_bugs.html .
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69IEEE/The Open Group 2017 _TOUPPER(3P)