CONV(3C)            UNIX Programmer's Manual             CONV(3C)

NAME
     _toupper, _tolower, toupper, tolower,  toascii  -  character
     translation

SYNOPSIS
     int toupper (c)
     int c;

     int tolower (c)
     int c;

     #include <ctype.h>

     int _toupper (c)
     int c;

     int _tolower (c)
     int c;

     int toascii (c)
     int c;

HP-UX COMPATIBILITY
     Level:    HP-UX/RUN ONLY

     Origin:   System III

DESCRIPTION
     _T_o_u_p_p_e_r and _t_o_l_o_w_e_r have as domain the range  of  _g_e_t_c:  the
     integers  from  -1  through 255.  If the argument of _t_o_u_p_p_e_r
     represents  a  lower-case  letter,   the   result   is   the
     corresponding upper-case letter.  If the argument of _t_o_l_o_w_e_r
     represents  an  upper-case  letter,  the   result   is   the
     corresponding lower-case letter.  All other arguments in the
     domain are returned unchanged.

     __t_o_u_p_p_e_r and __t_o_l_o_w_e_r are macros that  accomplish  the  same
     thing as _t_o_u_p_p_e_r and _t_o_l_o_w_e_r but have restricted domains and
     are faster.  __t_o_u_p_p_e_r requires a lower-case  letter  as  its
     argument; its result is the corresponding upper-case letter.
     __t_o_l_o_w_e_r requires an upper-case letter as its argument;  its
     result  is  the  corresponding lower-case letter.  Arguments
     outside the domain cause garbage results.  Use of this  form
     will never work with foreign character sets.

     _T_o_a_s_c_i_i yields its argument with all bits  turned  off  that
     are  not  part  of  a  standard 7 bit ASCII character; it is
     intended for compatibility with other systems.