SYNOPSIS

     #include <ctype.h>

     int
     tolower(int c);

     #include <xlocale.h>

     int
     tolower_l(int c, locale_t loc);

DESCRIPTION

     The tolower() function converts an upper-case letter to the corresponding
     lower-case letter.  For single C chars locales (see multibyte(3)) the
     value of the argument is representable as an unsigned char or the value
     of EOF.

     While the tolower() function uses the current locale, the tolower_l()
     function may be passed a locale directly. See xlocale(3) for more infor-
     mation.

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.

COMPATIBILITY

     The 4.4BSD extension of accepting arguments outside of the range of the
     unsigned char type in locales with large character sets is considered
     obsolete and may not be supported in future releases.  The towlower()
     function should be used instead.

SEE ALSO

     ctype(3), islower(3), multibyte(3), towlower(3), xlocale(3)

STANDARDS

     The tolower() function conforms to ISO/IEC 9899:1990 (``ISO C90'').

BSD                             August 21, 2004                            BSD