1TOUPPER(3P)                POSIX Programmer's Manual               TOUPPER(3P)
2
3
4

PROLOG

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.
10

NAME

12       toupper - transliterate lowercase characters to uppercase
13

SYNOPSIS

15       #include <ctype.h>
16
17       int toupper(int c);
18
19

DESCRIPTION

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.
29

RETURN VALUE

31       Upon successful completion, toupper() shall return the uppercase letter
32       corresponding to the argument passed.
33

ERRORS

35       No errors are defined.
36
37       The following sections are informative.
38

EXAMPLES

40       None.
41

APPLICATION USAGE

43       None.
44

RATIONALE

46       None.
47

FUTURE DIRECTIONS

49       None.
50

SEE ALSO

52       setlocale(), the Base Definitions volume of IEEE Std 1003.1-2001, Chap‐
53       ter 7, Locale, <ctype.h>
54

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 .
65
66
67
68IEEE/The Open Group                  2003                          TOUPPER(3P)
Impressum