SYNOPSIS

     #include <ctype.h>

     int
     toupper(int c);

     #include <xlocale.h>

     int
     toupper_l(int c, locale_t loc);

DESCRIPTION

     The toupper() function converts a lower-case letter to the corresponding
     upper-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 toupper() function uses the current locale, the toupper_l()
     function may be passed a locale directly. See xlocale(3) for more infor-
     mation.

RETURN VALUES

     If the argument is a lower-case letter, the toupper() function returns
     the corresponding upper-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 towupper()
     function should be used instead.

SEE ALSO

     ctype(3), isupper(3), multibyte(3), towupper(3), xlocale(3)

STANDARDS

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

BSD                             August 21, 2004                            BSD