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NetBSD 6.1.5 - man page for isupper (netbsd section 3)

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 letters.
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 unde- fined. See the CAVEATS section of ctype(3) for more details.
BSD
April 17, 2008 BSD


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