tolower(3) - NetBSD Manual Pages

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TOLOWER(3)              NetBSD Library Functions Manual             TOLOWER(3)


NAME

     tolower -- upper case to lower case letter conversion


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <ctype.h>

     int
     tolower(int c);


DESCRIPTION

     The tolower() function converts an upper-case letter to the corresponding
     lower-case letter.


RETURN VALUES

     If the argument is an upper-case letter, the tolower() function returns
     the corresponding lower-case letter if there is one; otherwise the argu-
     ment is returned unchanged.


SEE ALSO

     ctype(3), isalnum(3), isalpha(3), isascii(3), iscntrl(3), isdigit(3),
     isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3),
     isxdigit(3), stdio(3), toascii(3), toupper(3), ascii(7)


STANDARDS

     The tolower() function conforms to ANSI X3.159-1989 (``ANSI C89'').


CAVEATS

     The argument to tolower() 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 6.1.2                    April 17, 2008                    NetBSD 6.1.2