/* char.c: Character functions.
 *
 * $Id$
 *
 * Copyright 1990, 1991, 1992, 1993, 1994, 1995, Oliver Laumann, Berlin
 * Copyright 2002, 2003 Sam Hocevar <sam@zoy.org>, Paris
 *
 * This software was derived from Elk 1.2, which was Copyright 1987, 1988,
 * 1989, Nixdorf Computer AG and TELES GmbH, Berlin (Elk 1.2 has been written
 * by Oliver Laumann for TELES Telematic Services, Berlin, in a joint project
 * between TELES and Nixdorf Microprocessor Engineering, Berlin).
 *
 * Oliver Laumann, TELES GmbH, Nixdorf Computer AG and Sam Hocevar, as co-
 * owners or individual owners of copyright in this software, grant to any
 * person or company a worldwide, royalty free, license to
 *
 *    i) copy this software,
 *   ii) prepare derivative works based on this software,
 *  iii) distribute copies of this software or derivative works,
 *   iv) perform this software, or
 *    v) display this software,
 *
 * provided that this notice is not removed and that neither Oliver Laumann
 * nor Teles nor Nixdorf are deemed to have made any representations as to
 * the suitability of this software for any purpose nor are held responsible
 * for any defects of this software.
 *
 * THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
 */

#include "config.h"

#include <ctype.h>

#include "kernel.h"

Object Make_Char (register int c) {
    Object ch;

    SET(ch, T_Character, (unsigned char)c);
    return ch;
}

Object P_Charp (Object c) {
    return TYPE(c) == T_Character ? True : False;
}

Object P_Char_To_Integer (Object c) {
    Check_Type (c, T_Character);
    return Make_Integer (CHAR(c));
}

Object P_Integer_To_Char (Object n) {
    register int i;

    if ((i = Get_Exact_Integer (n)) < 0 || i > 255)
        Range_Error (n);
    return Make_Char (i);
}

Object P_Char_Upper_Casep (Object c) {
    Check_Type (c, T_Character);
    return isupper (CHAR(c)) ? True : False;
}

Object P_Char_Lower_Casep (Object c) {
    Check_Type (c, T_Character);
    return islower (CHAR(c)) ? True : False;
}

Object P_Char_Alphabeticp (Object c) {
    Check_Type (c, T_Character);
    return isalpha (CHAR(c)) ? True : False;
}

Object P_Char_Numericp (Object c) {
    Check_Type (c, T_Character);
    return isdigit (CHAR(c)) ? True : False;
}

Object P_Char_Whitespacep (Object c) {
    register int x;

    Check_Type (c, T_Character);
    x = CHAR(c);
    return Whitespace (x) ? True : False;
}

Object P_Char_Upcase (Object c) {
    Check_Type (c, T_Character);
    return islower (CHAR(c)) ? Make_Char (toupper (CHAR(c))) : c;
}

Object P_Char_Downcase (Object c) {
    Check_Type (c, T_Character);
    return isupper (CHAR(c)) ? Make_Char (tolower (CHAR(c))) : c;
}

int General_Chrcmp (Object c1, Object c2, register int ci) {
    Check_Type (c1, T_Character);
    Check_Type (c2, T_Character);
    if (ci)
        return Char_Map[CHAR(c1)] - Char_Map[CHAR(c2)];
    return CHAR(c1) - CHAR(c2);
}

Object P_Char_Eq (Object c1, Object c2) {
    return General_Chrcmp (c1, c2, 0) ? False : True;
}

Object P_Char_Less (Object c1, Object c2) {
    return General_Chrcmp (c1, c2, 0) < 0 ? True : False;
}

Object P_Char_Greater (Object c1, Object c2) {
    return General_Chrcmp (c1, c2, 0) > 0 ? True : False;
}

Object P_Char_Eq_Less (Object c1, Object c2) {
    return General_Chrcmp (c1, c2, 0) <= 0 ? True : False;
}

Object P_Char_Eq_Greater (Object c1, Object c2) {
    return General_Chrcmp (c1, c2, 0) >= 0 ? True : False;
}

Object P_Char_CI_Eq (Object c1, Object c2) {
    return General_Chrcmp (c1, c2, 1) ? False : True;
}

Object P_Char_CI_Less (Object c1, Object c2) {
    return General_Chrcmp (c1, c2, 1) < 0 ? True : False;
}

Object P_Char_CI_Greater (Object c1, Object c2) {
    return General_Chrcmp (c1, c2, 1) > 0 ? True : False;
}

Object P_Char_CI_Eq_Less (Object c1, Object c2) {
    return General_Chrcmp (c1, c2, 1) <= 0 ? True : False;
}

Object P_Char_CI_Eq_Greater (Object c1, Object c2) {
    return General_Chrcmp (c1, c2, 1) >= 0 ? True : False;
}