isupper man page on NetBSD
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ISUPPER(3) BSD Library Functions Manual ISUPPER(3)
NAME
isupper — upper-case character test
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ctype.h>
int
isupper(int c);
DESCRIPTION
The isupper() function tests for any upper-case letter or any of an
implementation-defined set of characters for which none of iscntrl(3),
isdigit(3), ispunct(3), or isspace(3) is true. In the ``C'' locale,
isupper() returns true only for the characters defined as upper-case let‐
ters.
RETURN VALUES
The isupper() function returns zero if the character tests false and
returns non-zero if the character tests true.
SEE ALSO
ctype(3), isalnum(3), isalpha(3), isascii(3), isblank(3), iscntrl(3),
isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3),
isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)
STANDARDS
The isupper() function conforms to ANSI X3.159-1989 (“ANSI C89”).
CAVEATS
The argument to isupper() must be EOF or representable as an unsigned
char; otherwise, the behavior is undefined. See the CAVEATS section of
ctype(3) for more details.
BSD April 17, 2008 BSD
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