islower(3) - NetBSD Manual Pages

ISLOWER(3)              NetBSD Library Functions Manual             ISLOWER(3)


NAME
islower - lower-case character test
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ctype.h> int islower(int c);
DESCRIPTION
The islower() function tests for any lower-case letter for which none of iscntrl(3), isdigit(3), ispunct(3), or isspace(3) is true. In the ``C'' locale, islower() returns true only for the characters defined as lower- case letters.
RETURN VALUES
The islower() macro returns zero if the character tests false and returns non-zero if the character tests true.
SEE ALSO
isalnum(3), isalpha(3), isascii(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), isprint(3), ispunct(3), isspace(3), isupper(3), isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)
STANDARDS
The islower() function conforms to ANSI X3.159-1989 (``ANSI C'').
CAVEATS
The argument to islower() must be EOF or representable as an unsigned char; otherwise, the result is undefined. NetBSD 2.0 June 29, 1991 NetBSD 2.0

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