islower(3) - NetBSD Manual Pages

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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() 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), 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 C89'').


CAVEATS

     The argument to islower() must be EOF or representable as an unsigned
     char; otherwise, the behavior is undefined.  See the CAVEATS section of
     ctype(3) for more details.

NetBSD 10.1                     April 17, 2008                     NetBSD 10.1