MirBSD manpage: isupper(3)

ISUPPER(3)                 BSD Programmer's Manual                  ISUPPER(3)

NAME

     isupper - upper-case character test

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() macro returns zero if the character tests false or non-zero
     if the character tests true.

SEE ALSO

     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 result is undefined.

MirBSD #10-current              June 29, 1991                                1