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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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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21 The toupper() function has as a domain a type int, the value of which
22 is representable as an unsigned char or the value of EOF. If the argu‐
23 ment has any other value, the behavior is undefined. If the argument of
24 toupper() represents a lowercase letter, and there exists a correspond‐
25 ing uppercase letter (as defined by character type information in the
26 program locale category LC_CTYPE ), the result shall be the corre‐
27 sponding uppercase letter. All other arguments in the domain are
28 returned unchanged.
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31 Upon successful completion, toupper() shall return the uppercase letter
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35 No errors are defined.
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37 The following sections are informative.
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40 None.
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43 None.
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52 setlocale(), the Base Definitions volume of IEEE Std 1003.1-2001, Chap‐
53 ter 7, Locale, <ctype.h>
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56 Portions of this text are reprinted and reproduced in electronic form
57 from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
58 -- Portable Operating System Interface (POSIX), The Open Group Base
59 Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
60 Electrical and Electronics Engineers, Inc and The Open Group. In the
61 event of any discrepancy between this version and the original IEEE and
62 The Open Group Standard, the original IEEE and The Open Group Standard
63 is the referee document. The original Standard can be obtained online
64 at http://www.opengroup.org/unix/online.html .
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68IEEE/The Open Group 2003 TOUPPER(3P)