winscp/source/putty/windows/unicode.c

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <time.h>
#include <assert.h>

#include "putty.h"
#include "terminal.h"
#include "misc.h"

/* Character conversion arrays; they are usually taken from windows,
 * the xterm one has the four scanlines that have no unicode 2.0
 * equivalents mapped to their unicode 3.0 locations.
 */
static const WCHAR unitab_xterm_std[32] = {
    0x2666, 0x2592, 0x2409, 0x240c, 0x240d, 0x240a, 0x00b0, 0x00b1,
    0x2424, 0x240b, 0x2518, 0x2510, 0x250c, 0x2514, 0x253c, 0x23ba,
    0x23bb, 0x2500, 0x23bc, 0x23bd, 0x251c, 0x2524, 0x2534, 0x252c,
    0x2502, 0x2264, 0x2265, 0x03c0, 0x2260, 0x00a3, 0x00b7, 0x0020
};

/*
 * If the codepage is non-zero it's a window codepage, zero means use a
 * local codepage. The name is always converted to the first of any
 * duplicate definitions.
 */

/*
 * Tables for ISO-8859-{1-10,13-16} derived from those downloaded
 * 2001-10-02 from <http://www.unicode.org/Public/MAPPINGS/> -- jtn
 * Table for ISO-8859-11 derived from same on 2002-11-18. -- bjh21
 */

/* XXX: This could be done algorithmically, but I'm not sure it's
 *      worth the hassle -- jtn */
/* ISO/IEC 8859-1:1998 (Latin-1, "Western", "West European") */
static const wchar_t iso_8859_1[] = {
    0x00A0, 0x00A1, 0x00A2, 0x00A3, 0x00A4, 0x00A5, 0x00A6, 0x00A7,
    0x00A8, 0x00A9, 0x00AA, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x00AF,
    0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x00B4, 0x00B5, 0x00B6, 0x00B7,
    0x00B8, 0x00B9, 0x00BA, 0x00BB, 0x00BC, 0x00BD, 0x00BE, 0x00BF,
    0x00C0, 0x00C1, 0x00C2, 0x00C3, 0x00C4, 0x00C5, 0x00C6, 0x00C7,
    0x00C8, 0x00C9, 0x00CA, 0x00CB, 0x00CC, 0x00CD, 0x00CE, 0x00CF,
    0x00D0, 0x00D1, 0x00D2, 0x00D3, 0x00D4, 0x00D5, 0x00D6, 0x00D7,
    0x00D8, 0x00D9, 0x00DA, 0x00DB, 0x00DC, 0x00DD, 0x00DE, 0x00DF,
    0x00E0, 0x00E1, 0x00E2, 0x00E3, 0x00E4, 0x00E5, 0x00E6, 0x00E7,
    0x00E8, 0x00E9, 0x00EA, 0x00EB, 0x00EC, 0x00ED, 0x00EE, 0x00EF,
    0x00F0, 0x00F1, 0x00F2, 0x00F3, 0x00F4, 0x00F5, 0x00F6, 0x00F7,
    0x00F8, 0x00F9, 0x00FA, 0x00FB, 0x00FC, 0x00FD, 0x00FE, 0x00FF
};

/* ISO/IEC 8859-2:1999 (Latin-2, "Central European", "East European") */
static const wchar_t iso_8859_2[] = {
    0x00A0, 0x0104, 0x02D8, 0x0141, 0x00A4, 0x013D, 0x015A, 0x00A7,
    0x00A8, 0x0160, 0x015E, 0x0164, 0x0179, 0x00AD, 0x017D, 0x017B,
    0x00B0, 0x0105, 0x02DB, 0x0142, 0x00B4, 0x013E, 0x015B, 0x02C7,
    0x00B8, 0x0161, 0x015F, 0x0165, 0x017A, 0x02DD, 0x017E, 0x017C,
    0x0154, 0x00C1, 0x00C2, 0x0102, 0x00C4, 0x0139, 0x0106, 0x00C7,
    0x010C, 0x00C9, 0x0118, 0x00CB, 0x011A, 0x00CD, 0x00CE, 0x010E,
    0x0110, 0x0143, 0x0147, 0x00D3, 0x00D4, 0x0150, 0x00D6, 0x00D7,
    0x0158, 0x016E, 0x00DA, 0x0170, 0x00DC, 0x00DD, 0x0162, 0x00DF,
    0x0155, 0x00E1, 0x00E2, 0x0103, 0x00E4, 0x013A, 0x0107, 0x00E7,
    0x010D, 0x00E9, 0x0119, 0x00EB, 0x011B, 0x00ED, 0x00EE, 0x010F,
    0x0111, 0x0144, 0x0148, 0x00F3, 0x00F4, 0x0151, 0x00F6, 0x00F7,
    0x0159, 0x016F, 0x00FA, 0x0171, 0x00FC, 0x00FD, 0x0163, 0x02D9
};

/* ISO/IEC 8859-3:1999 (Latin-3, "South European", "Maltese & Esperanto") */
static const wchar_t iso_8859_3[] = {
    0x00A0, 0x0126, 0x02D8, 0x00A3, 0x00A4, 0xFFFD, 0x0124, 0x00A7,
    0x00A8, 0x0130, 0x015E, 0x011E, 0x0134, 0x00AD, 0xFFFD, 0x017B,
    0x00B0, 0x0127, 0x00B2, 0x00B3, 0x00B4, 0x00B5, 0x0125, 0x00B7,
    0x00B8, 0x0131, 0x015F, 0x011F, 0x0135, 0x00BD, 0xFFFD, 0x017C,
    0x00C0, 0x00C1, 0x00C2, 0xFFFD, 0x00C4, 0x010A, 0x0108, 0x00C7,
    0x00C8, 0x00C9, 0x00CA, 0x00CB, 0x00CC, 0x00CD, 0x00CE, 0x00CF,
    0xFFFD, 0x00D1, 0x00D2, 0x00D3, 0x00D4, 0x0120, 0x00D6, 0x00D7,
    0x011C, 0x00D9, 0x00DA, 0x00DB, 0x00DC, 0x016C, 0x015C, 0x00DF,
    0x00E0, 0x00E1, 0x00E2, 0xFFFD, 0x00E4, 0x010B, 0x0109, 0x00E7,
    0x00E8, 0x00E9, 0x00EA, 0x00EB, 0x00EC, 0x00ED, 0x00EE, 0x00EF,
    0xFFFD, 0x00F1, 0x00F2, 0x00F3, 0x00F4, 0x0121, 0x00F6, 0x00F7,
    0x011D, 0x00F9, 0x00FA, 0x00FB, 0x00FC, 0x016D, 0x015D, 0x02D9
};

/* ISO/IEC 8859-4:1998 (Latin-4, "North European") */
static const wchar_t iso_8859_4[] = {
    0x00A0, 0x0104, 0x0138, 0x0156, 0x00A4, 0x0128, 0x013B, 0x00A7,
    0x00A8, 0x0160, 0x0112, 0x0122, 0x0166, 0x00AD, 0x017D, 0x00AF,
    0x00B0, 0x0105, 0x02DB, 0x0157, 0x00B4, 0x0129, 0x013C, 0x02C7,
    0x00B8, 0x0161, 0x0113, 0x0123, 0x0167, 0x014A, 0x017E, 0x014B,
    0x0100, 0x00C1, 0x00C2, 0x00C3, 0x00C4, 0x00C5, 0x00C6, 0x012E,
    0x010C, 0x00C9, 0x0118, 0x00CB, 0x0116, 0x00CD, 0x00CE, 0x012A,
    0x0110, 0x0145, 0x014C, 0x0136, 0x00D4, 0x00D5, 0x00D6, 0x00D7,
    0x00D8, 0x0172, 0x00DA, 0x00DB, 0x00DC, 0x0168, 0x016A, 0x00DF,
    0x0101, 0x00E1, 0x00E2, 0x00E3, 0x00E4, 0x00E5, 0x00E6, 0x012F,
    0x010D, 0x00E9, 0x0119, 0x00EB, 0x0117, 0x00ED, 0x00EE, 0x012B,
    0x0111, 0x0146, 0x014D, 0x0137, 0x00F4, 0x00F5, 0x00F6, 0x00F7,
    0x00F8, 0x0173, 0x00FA, 0x00FB, 0x00FC, 0x0169, 0x016B, 0x02D9
};

/* ISO/IEC 8859-5:1999 (Latin/Cyrillic) */
static const wchar_t iso_8859_5[] = {
    0x00A0, 0x0401, 0x0402, 0x0403, 0x0404, 0x0405, 0x0406, 0x0407,
    0x0408, 0x0409, 0x040A, 0x040B, 0x040C, 0x00AD, 0x040E, 0x040F,
    0x0410, 0x0411, 0x0412, 0x0413, 0x0414, 0x0415, 0x0416, 0x0417,
    0x0418, 0x0419, 0x041A, 0x041B, 0x041C, 0x041D, 0x041E, 0x041F,
    0x0420, 0x0421, 0x0422, 0x0423, 0x0424, 0x0425, 0x0426, 0x0427,
    0x0428, 0x0429, 0x042A, 0x042B, 0x042C, 0x042D, 0x042E, 0x042F,
    0x0430, 0x0431, 0x0432, 0x0433, 0x0434, 0x0435, 0x0436, 0x0437,
    0x0438, 0x0439, 0x043A, 0x043B, 0x043C, 0x043D, 0x043E, 0x043F,
    0x0440, 0x0441, 0x0442, 0x0443, 0x0444, 0x0445, 0x0446, 0x0447,
    0x0448, 0x0449, 0x044A, 0x044B, 0x044C, 0x044D, 0x044E, 0x044F,
    0x2116, 0x0451, 0x0452, 0x0453, 0x0454, 0x0455, 0x0456, 0x0457,
    0x0458, 0x0459, 0x045A, 0x045B, 0x045C, 0x00A7, 0x045E, 0x045F
};

/* ISO/IEC 8859-6:1999 (Latin/Arabic) */
static const wchar_t iso_8859_6[] = {
    0x00A0, 0xFFFD, 0xFFFD, 0xFFFD, 0x00A4, 0xFFFD, 0xFFFD, 0xFFFD,
    0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0x060C, 0x00AD, 0xFFFD, 0xFFFD,
    0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD,
    0xFFFD, 0xFFFD, 0xFFFD, 0x061B, 0xFFFD, 0xFFFD, 0xFFFD, 0x061F,
    0xFFFD, 0x0621, 0x0622, 0x0623, 0x0624, 0x0625, 0x0626, 0x0627,
    0x0628, 0x0629, 0x062A, 0x062B, 0x062C, 0x062D, 0x062E, 0x062F,
    0x0630, 0x0631, 0x0632, 0x0633, 0x0634, 0x0635, 0x0636, 0x0637,
    0x0638, 0x0639, 0x063A, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD,
    0x0640, 0x0641, 0x0642, 0x0643, 0x0644, 0x0645, 0x0646, 0x0647,
    0x0648, 0x0649, 0x064A, 0x064B, 0x064C, 0x064D, 0x064E, 0x064F,
    0x0650, 0x0651, 0x0652, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD,
    0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD
};

/* ISO 8859-7:1987 (Latin/Greek) */
static const wchar_t iso_8859_7[] = {
    0x00A0, 0x2018, 0x2019, 0x00A3, 0xFFFD, 0xFFFD, 0x00A6, 0x00A7,
    0x00A8, 0x00A9, 0xFFFD, 0x00AB, 0x00AC, 0x00AD, 0xFFFD, 0x2015,
    0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x0384, 0x0385, 0x0386, 0x00B7,
    0x0388, 0x0389, 0x038A, 0x00BB, 0x038C, 0x00BD, 0x038E, 0x038F,
    0x0390, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396, 0x0397,
    0x0398, 0x0399, 0x039A, 0x039B, 0x039C, 0x039D, 0x039E, 0x039F,
    0x03A0, 0x03A1, 0xFFFD, 0x03A3, 0x03A4, 0x03A5, 0x03A6, 0x03A7,
    0x03A8, 0x03A9, 0x03AA, 0x03AB, 0x03AC, 0x03AD, 0x03AE, 0x03AF,
    0x03B0, 0x03B1, 0x03B2, 0x03B3, 0x03B4, 0x03B5, 0x03B6, 0x03B7,
    0x03B8, 0x03B9, 0x03BA, 0x03BB, 0x03BC, 0x03BD, 0x03BE, 0x03BF,
    0x03C0, 0x03C1, 0x03C2, 0x03C3, 0x03C4, 0x03C5, 0x03C6, 0x03C7,
    0x03C8, 0x03C9, 0x03CA, 0x03CB, 0x03CC, 0x03CD, 0x03CE, 0xFFFD
};

/* ISO/IEC 8859-8:1999 (Latin/Hebrew) */
static const wchar_t iso_8859_8[] = {
    0x00A0, 0xFFFD, 0x00A2, 0x00A3, 0x00A4, 0x00A5, 0x00A6, 0x00A7,
    0x00A8, 0x00A9, 0x00D7, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x00AF,
    0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x00B4, 0x00B5, 0x00B6, 0x00B7,
    0x00B8, 0x00B9, 0x00F7, 0x00BB, 0x00BC, 0x00BD, 0x00BE, 0xFFFD,
    0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD,
    0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD,
    0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD,
    0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0x2017,
    0x05D0, 0x05D1, 0x05D2, 0x05D3, 0x05D4, 0x05D5, 0x05D6, 0x05D7,
    0x05D8, 0x05D9, 0x05DA, 0x05DB, 0x05DC, 0x05DD, 0x05DE, 0x05DF,
    0x05E0, 0x05E1, 0x05E2, 0x05E3, 0x05E4, 0x05E5, 0x05E6, 0x05E7,
    0x05E8, 0x05E9, 0x05EA, 0xFFFD, 0xFFFD, 0x200E, 0x200F, 0xFFFD
};

/* ISO/IEC 8859-9:1999 (Latin-5, "Turkish") */
static const wchar_t iso_8859_9[] = {
    0x00A0, 0x00A1, 0x00A2, 0x00A3, 0x00A4, 0x00A5, 0x00A6, 0x00A7,
    0x00A8, 0x00A9, 0x00AA, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x00AF,
    0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x00B4, 0x00B5, 0x00B6, 0x00B7,
    0x00B8, 0x00B9, 0x00BA, 0x00BB, 0x00BC, 0x00BD, 0x00BE, 0x00BF,
    0x00C0, 0x00C1, 0x00C2, 0x00C3, 0x00C4, 0x00C5, 0x00C6, 0x00C7,
    0x00C8, 0x00C9, 0x00CA, 0x00CB, 0x00CC, 0x00CD, 0x00CE, 0x00CF,
    0x011E, 0x00D1, 0x00D2, 0x00D3, 0x00D4, 0x00D5, 0x00D6, 0x00D7,
    0x00D8, 0x00D9, 0x00DA, 0x00DB, 0x00DC, 0x0130, 0x015E, 0x00DF,
    0x00E0, 0x00E1, 0x00E2, 0x00E3, 0x00E4, 0x00E5, 0x00E6, 0x00E7,
    0x00E8, 0x00E9, 0x00EA, 0x00EB, 0x00EC, 0x00ED, 0x00EE, 0x00EF,
    0x011F, 0x00F1, 0x00F2, 0x00F3, 0x00F4, 0x00F5, 0x00F6, 0x00F7,
    0x00F8, 0x00F9, 0x00FA, 0x00FB, 0x00FC, 0x0131, 0x015F, 0x00FF
};

/* ISO/IEC 8859-10:1998 (Latin-6, "Nordic" [Sami, Inuit, Icelandic]) */
static const wchar_t iso_8859_10[] = {
    0x00A0, 0x0104, 0x0112, 0x0122, 0x012A, 0x0128, 0x0136, 0x00A7,
    0x013B, 0x0110, 0x0160, 0x0166, 0x017D, 0x00AD, 0x016A, 0x014A,
    0x00B0, 0x0105, 0x0113, 0x0123, 0x012B, 0x0129, 0x0137, 0x00B7,
    0x013C, 0x0111, 0x0161, 0x0167, 0x017E, 0x2015, 0x016B, 0x014B,
    0x0100, 0x00C1, 0x00C2, 0x00C3, 0x00C4, 0x00C5, 0x00C6, 0x012E,
    0x010C, 0x00C9, 0x0118, 0x00CB, 0x0116, 0x00CD, 0x00CE, 0x00CF,
    0x00D0, 0x0145, 0x014C, 0x00D3, 0x00D4, 0x00D5, 0x00D6, 0x0168,
    0x00D8, 0x0172, 0x00DA, 0x00DB, 0x00DC, 0x00DD, 0x00DE, 0x00DF,
    0x0101, 0x00E1, 0x00E2, 0x00E3, 0x00E4, 0x00E5, 0x00E6, 0x012F,
    0x010D, 0x00E9, 0x0119, 0x00EB, 0x0117, 0x00ED, 0x00EE, 0x00EF,
    0x00F0, 0x0146, 0x014D, 0x00F3, 0x00F4, 0x00F5, 0x00F6, 0x0169,
    0x00F8, 0x0173, 0x00FA, 0x00FB, 0x00FC, 0x00FD, 0x00FE, 0x0138
};

/* ISO/IEC 8859-11:2001 ("Thai", "TIS620") */
static const wchar_t iso_8859_11[] = {
    0x00A0, 0x0E01, 0x0E02, 0x0E03, 0x0E04, 0x0E05, 0x0E06, 0x0E07,
    0x0E08, 0x0E09, 0x0E0A, 0x0E0B, 0x0E0C, 0x0E0D, 0x0E0E, 0x0E0F,
    0x0E10, 0x0E11, 0x0E12, 0x0E13, 0x0E14, 0x0E15, 0x0E16, 0x0E17,
    0x0E18, 0x0E19, 0x0E1A, 0x0E1B, 0x0E1C, 0x0E1D, 0x0E1E, 0x0E1F,
    0x0E20, 0x0E21, 0x0E22, 0x0E23, 0x0E24, 0x0E25, 0x0E26, 0x0E27,
    0x0E28, 0x0E29, 0x0E2A, 0x0E2B, 0x0E2C, 0x0E2D, 0x0E2E, 0x0E2F,
    0x0E30, 0x0E31, 0x0E32, 0x0E33, 0x0E34, 0x0E35, 0x0E36, 0x0E37,
    0x0E38, 0x0E39, 0x0E3A, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0x0E3F,
    0x0E40, 0x0E41, 0x0E42, 0x0E43, 0x0E44, 0x0E45, 0x0E46, 0x0E47,
    0x0E48, 0x0E49, 0x0E4A, 0x0E4B, 0x0E4C, 0x0E4D, 0x0E4E, 0x0E4F,
    0x0E50, 0x0E51, 0x0E52, 0x0E53, 0x0E54, 0x0E55, 0x0E56, 0x0E57,
    0x0E58, 0x0E59, 0x0E5A, 0x0E5B, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD
};

/* ISO/IEC 8859-13:1998 (Latin-7, "Baltic Rim") */
static const wchar_t iso_8859_13[] = {
    0x00A0, 0x201D, 0x00A2, 0x00A3, 0x00A4, 0x201E, 0x00A6, 0x00A7,
    0x00D8, 0x00A9, 0x0156, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x00C6,
    0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x201C, 0x00B5, 0x00B6, 0x00B7,
    0x00F8, 0x00B9, 0x0157, 0x00BB, 0x00BC, 0x00BD, 0x00BE, 0x00E6,
    0x0104, 0x012E, 0x0100, 0x0106, 0x00C4, 0x00C5, 0x0118, 0x0112,
    0x010C, 0x00C9, 0x0179, 0x0116, 0x0122, 0x0136, 0x012A, 0x013B,
    0x0160, 0x0143, 0x0145, 0x00D3, 0x014C, 0x00D5, 0x00D6, 0x00D7,
    0x0172, 0x0141, 0x015A, 0x016A, 0x00DC, 0x017B, 0x017D, 0x00DF,
    0x0105, 0x012F, 0x0101, 0x0107, 0x00E4, 0x00E5, 0x0119, 0x0113,
    0x010D, 0x00E9, 0x017A, 0x0117, 0x0123, 0x0137, 0x012B, 0x013C,
    0x0161, 0x0144, 0x0146, 0x00F3, 0x014D, 0x00F5, 0x00F6, 0x00F7,
    0x0173, 0x0142, 0x015B, 0x016B, 0x00FC, 0x017C, 0x017E, 0x2019
};

/* ISO/IEC 8859-14:1998 (Latin-8, "Celtic", "Gaelic/Welsh") */
static const wchar_t iso_8859_14[] = {
    0x00A0, 0x1E02, 0x1E03, 0x00A3, 0x010A, 0x010B, 0x1E0A, 0x00A7,
    0x1E80, 0x00A9, 0x1E82, 0x1E0B, 0x1EF2, 0x00AD, 0x00AE, 0x0178,
    0x1E1E, 0x1E1F, 0x0120, 0x0121, 0x1E40, 0x1E41, 0x00B6, 0x1E56,
    0x1E81, 0x1E57, 0x1E83, 0x1E60, 0x1EF3, 0x1E84, 0x1E85, 0x1E61,
    0x00C0, 0x00C1, 0x00C2, 0x00C3, 0x00C4, 0x00C5, 0x00C6, 0x00C7,
    0x00C8, 0x00C9, 0x00CA, 0x00CB, 0x00CC, 0x00CD, 0x00CE, 0x00CF,
    0x0174, 0x00D1, 0x00D2, 0x00D3, 0x00D4, 0x00D5, 0x00D6, 0x1E6A,
    0x00D8, 0x00D9, 0x00DA, 0x00DB, 0x00DC, 0x00DD, 0x0176, 0x00DF,
    0x00E0, 0x00E1, 0x00E2, 0x00E3, 0x00E4, 0x00E5, 0x00E6, 0x00E7,
    0x00E8, 0x00E9, 0x00EA, 0x00EB, 0x00EC, 0x00ED, 0x00EE, 0x00EF,
    0x0175, 0x00F1, 0x00F2, 0x00F3, 0x00F4, 0x00F5, 0x00F6, 0x1E6B,
    0x00F8, 0x00F9, 0x00FA, 0x00FB, 0x00FC, 0x00FD, 0x0177, 0x00FF
};

/* ISO/IEC 8859-15:1999 (Latin-9 aka -0, "euro") */
static const wchar_t iso_8859_15[] = {
    0x00A0, 0x00A1, 0x00A2, 0x00A3, 0x20AC, 0x00A5, 0x0160, 0x00A7,
    0x0161, 0x00A9, 0x00AA, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x00AF,
    0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x017D, 0x00B5, 0x00B6, 0x00B7,
    0x017E, 0x00B9, 0x00BA, 0x00BB, 0x0152, 0x0153, 0x0178, 0x00BF,
    0x00C0, 0x00C1, 0x00C2, 0x00C3, 0x00C4, 0x00C5, 0x00C6, 0x00C7,
    0x00C8, 0x00C9, 0x00CA, 0x00CB, 0x00CC, 0x00CD, 0x00CE, 0x00CF,
    0x00D0, 0x00D1, 0x00D2, 0x00D3, 0x00D4, 0x00D5, 0x00D6, 0x00D7,
    0x00D8, 0x00D9, 0x00DA, 0x00DB, 0x00DC, 0x00DD, 0x00DE, 0x00DF,
    0x00E0, 0x00E1, 0x00E2, 0x00E3, 0x00E4, 0x00E5, 0x00E6, 0x00E7,
    0x00E8, 0x00E9, 0x00EA, 0x00EB, 0x00EC, 0x00ED, 0x00EE, 0x00EF,
    0x00F0, 0x00F1, 0x00F2, 0x00F3, 0x00F4, 0x00F5, 0x00F6, 0x00F7,
    0x00F8, 0x00F9, 0x00FA, 0x00FB, 0x00FC, 0x00FD, 0x00FE, 0x00FF
};

/* ISO/IEC 8859-16:2001 (Latin-10, "Balkan") */
static const wchar_t iso_8859_16[] = {
    0x00A0, 0x0104, 0x0105, 0x0141, 0x20AC, 0x201E, 0x0160, 0x00A7,
    0x0161, 0x00A9, 0x0218, 0x00AB, 0x0179, 0x00AD, 0x017A, 0x017B,
    0x00B0, 0x00B1, 0x010C, 0x0142, 0x017D, 0x201D, 0x00B6, 0x00B7,
    0x017E, 0x010D, 0x0219, 0x00BB, 0x0152, 0x0153, 0x0178, 0x017C,
    0x00C0, 0x00C1, 0x00C2, 0x0102, 0x00C4, 0x0106, 0x00C6, 0x00C7,
    0x00C8, 0x00C9, 0x00CA, 0x00CB, 0x00CC, 0x00CD, 0x00CE, 0x00CF,
    0x0110, 0x0143, 0x00D2, 0x00D3, 0x00D4, 0x0150, 0x00D6, 0x015A,
    0x0170, 0x00D9, 0x00DA, 0x00DB, 0x00DC, 0x0118, 0x021A, 0x00DF,
    0x00E0, 0x00E1, 0x00E2, 0x0103, 0x00E4, 0x0107, 0x00E6, 0x00E7,
    0x00E8, 0x00E9, 0x00EA, 0x00EB, 0x00EC, 0x00ED, 0x00EE, 0x00EF,
    0x0111, 0x0144, 0x00F2, 0x00F3, 0x00F4, 0x0151, 0x00F6, 0x015B,
    0x0171, 0x00F9, 0x00FA, 0x00FB, 0x00FC, 0x0119, 0x021B, 0x00FF
};

static const wchar_t roman8[] = {
    0x00A0, 0x00C0, 0x00C2, 0x00C8, 0x00CA, 0x00CB, 0x00CE, 0x00CF,
    0x00B4, 0x02CB, 0x02C6, 0x00A8, 0x02DC, 0x00D9, 0x00DB, 0x20A4,
    0x00AF, 0x00DD, 0x00FD, 0x00B0, 0x00C7, 0x00E7, 0x00D1, 0x00F1,
    0x00A1, 0x00BF, 0x00A4, 0x00A3, 0x00A5, 0x00A7, 0x0192, 0x00A2,
    0x00E2, 0x00EA, 0x00F4, 0x00FB, 0x00E1, 0x00E9, 0x00F3, 0x00FA,
    0x00E0, 0x00E8, 0x00F2, 0x00F9, 0x00E4, 0x00EB, 0x00F6, 0x00FC,
    0x00C5, 0x00EE, 0x00D8, 0x00C6, 0x00E5, 0x00ED, 0x00F8, 0x00E6,
    0x00C4, 0x00EC, 0x00D6, 0x00DC, 0x00C9, 0x00EF, 0x00DF, 0x00D4,
    0x00C1, 0x00C3, 0x00E3, 0x00D0, 0x00F0, 0x00CD, 0x00CC, 0x00D3,
    0x00D2, 0x00D5, 0x00F5, 0x0160, 0x0161, 0x00DA, 0x0178, 0x00FF,
    0x00DE, 0x00FE, 0x00B7, 0x00B5, 0x00B6, 0x00BE, 0x2014, 0x00BC,
    0x00BD, 0x00AA, 0x00BA, 0x00AB, 0x25A0, 0x00BB, 0x00B1, 0xFFFD
};

static const wchar_t koi8_u[] = {
    0x2500, 0x2502, 0x250C, 0x2510, 0x2514, 0x2518, 0x251C, 0x2524,
    0x252C, 0x2534, 0x253C, 0x2580, 0x2584, 0x2588, 0x258C, 0x2590,
    0x2591, 0x2592, 0x2593, 0x2320, 0x25A0, 0x2022, 0x221A, 0x2248,
    0x2264, 0x2265, 0x00A0, 0x2321, 0x00B0, 0x00B2, 0x00B7, 0x00F7,
    0x2550, 0x2551, 0x2552, 0x0451, 0x0454, 0x2554, 0x0456, 0x0457,
    0x2557, 0x2558, 0x2559, 0x255A, 0x255B, 0x0491, 0x255D, 0x255E,
    0x255F, 0x2560, 0x2561, 0x0401, 0x0404, 0x2563, 0x0406, 0x0407,
    0x2566, 0x2567, 0x2568, 0x2569, 0x256A, 0x0490, 0x256C, 0x00A9,
    0x044E, 0x0430, 0x0431, 0x0446, 0x0434, 0x0435, 0x0444, 0x0433,
    0x0445, 0x0438, 0x0439, 0x043A, 0x043B, 0x043C, 0x043D, 0x043E,
    0x043F, 0x044F, 0x0440, 0x0441, 0x0442, 0x0443, 0x0436, 0x0432,
    0x044C, 0x044B, 0x0437, 0x0448, 0x044D, 0x0449, 0x0447, 0x044A,
    0x042E, 0x0410, 0x0411, 0x0426, 0x0414, 0x0415, 0x0424, 0x0413,
    0x0425, 0x0418, 0x0419, 0x041A, 0x041B, 0x041C, 0x041D, 0x041E,
    0x041F, 0x042F, 0x0420, 0x0421, 0x0422, 0x0423, 0x0416, 0x0412,
    0x042C, 0x042B, 0x0417, 0x0428, 0x042D, 0x0429, 0x0427, 0x042A
};

static const wchar_t vscii[] = {
    0x0000, 0x0001, 0x1EB2, 0x0003, 0x0004, 0x1EB4, 0x1EAA, 0x0007,
    0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f,
    0x0010, 0x0011, 0x0012, 0x0013, 0x1EF6, 0x0015, 0x0016, 0x0017,
    0x0018, 0x1EF8, 0x001a, 0x001b, 0x001c, 0x001d, 0x1EF4, 0x001f,
    0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
    0x0028, 0x0029, 0x002A, 0x002B, 0x002C, 0x002D, 0x002E, 0x002F,
    0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
    0x0038, 0x0039, 0x003A, 0x003B, 0x003C, 0x003D, 0x003E, 0x003F,
    0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
    0x0048, 0x0049, 0x004A, 0x004B, 0x004C, 0x004D, 0x004E, 0x004F,
    0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
    0x0058, 0x0059, 0x005A, 0x005B, 0x005C, 0x005D, 0x005E, 0x005F,
    0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
    0x0068, 0x0069, 0x006A, 0x006B, 0x006C, 0x006D, 0x006E, 0x006F,
    0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
    0x0078, 0x0079, 0x007A, 0x007B, 0x007C, 0x007D, 0x007E, 0x007f,
    0x1EA0, 0x1EAE, 0x1EB0, 0x1EB6, 0x1EA4, 0x1EA6, 0x1EA8, 0x1EAC,
    0x1EBC, 0x1EB8, 0x1EBE, 0x1EC0, 0x1EC2, 0x1EC4, 0x1EC6, 0x1ED0,
    0x1ED2, 0x1ED4, 0x1ED6, 0x1ED8, 0x1EE2, 0x1EDA, 0x1EDC, 0x1EDE,
    0x1ECA, 0x1ECE, 0x1ECC, 0x1EC8, 0x1EE6, 0x0168, 0x1EE4, 0x1EF2,
    0x00D5, 0x1EAF, 0x1EB1, 0x1EB7, 0x1EA5, 0x1EA7, 0x1EA8, 0x1EAD,
    0x1EBD, 0x1EB9, 0x1EBF, 0x1EC1, 0x1EC3, 0x1EC5, 0x1EC7, 0x1ED1,
    0x1ED3, 0x1ED5, 0x1ED7, 0x1EE0, 0x01A0, 0x1ED9, 0x1EDD, 0x1EDF,
    0x1ECB, 0x1EF0, 0x1EE8, 0x1EEA, 0x1EEC, 0x01A1, 0x1EDB, 0x01AF,
    0x00C0, 0x00C1, 0x00C2, 0x00C3, 0x1EA2, 0x0102, 0x1EB3, 0x1EB5,
    0x00C8, 0x00C9, 0x00CA, 0x1EBA, 0x00CC, 0x00CD, 0x0128, 0x1EF3,
    0x0110, 0x1EE9, 0x00D2, 0x00D3, 0x00D4, 0x1EA1, 0x1EF7, 0x1EEB,
    0x1EED, 0x00D9, 0x00DA, 0x1EF9, 0x1EF5, 0x00DD, 0x1EE1, 0x01B0,
    0x00E0, 0x00E1, 0x00E2, 0x00E3, 0x1EA3, 0x0103, 0x1EEF, 0x1EAB,
    0x00E8, 0x00E9, 0x00EA, 0x1EBB, 0x00EC, 0x00ED, 0x0129, 0x1EC9,
    0x0111, 0x1EF1, 0x00F2, 0x00F3, 0x00F4, 0x00F5, 0x1ECF, 0x1ECD,
    0x1EE5, 0x00F9, 0x00FA, 0x0169, 0x1EE7, 0x00FD, 0x1EE3, 0x1EEE
};

static const wchar_t dec_mcs[] = {
    0x00A0, 0x00A1, 0x00A2, 0x00A3, 0xFFFD, 0x00A5, 0xFFFD, 0x00A7,
    0x00A4, 0x00A9, 0x00AA, 0x00AB, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD,
    0x00B0, 0x00B1, 0x00B2, 0x00B3, 0xFFFD, 0x00B5, 0x00B6, 0x00B7,
    0xFFFD, 0x00B9, 0x00BA, 0x00BB, 0x00BC, 0x00BD, 0xFFFD, 0x00BF,
    0x00C0, 0x00C1, 0x00C2, 0x00C3, 0x00C4, 0x00C5, 0x00C6, 0x00C7,
    0x00C8, 0x00C9, 0x00CA, 0x00CB, 0x00CC, 0x00CD, 0x00CE, 0x00CF,
    0xFFFD, 0x00D1, 0x00D2, 0x00D3, 0x00D4, 0x00D5, 0x00D6, 0x0152,
    0x00D8, 0x00D9, 0x00DA, 0x00DB, 0x00DC, 0x0178, 0xFFFD, 0x00DF,
    0x00E0, 0x00E1, 0x00E2, 0x00E3, 0x00E4, 0x00E5, 0x00E6, 0x00E7,
    0x00E8, 0x00E9, 0x00EA, 0x00EB, 0x00EC, 0x00ED, 0x00EE, 0x00EF,
    0xFFFD, 0x00F1, 0x00F2, 0x00F3, 0x00F4, 0x00F5, 0x00F6, 0x0153,
    0x00F8, 0x00F9, 0x00FA, 0x00FB, 0x00FC, 0x00FF, 0xFFFD, 0xFFFD
};

/* Mazovia (Polish) aka CP620
 * from "Mazowia to Unicode table", 04/24/96, Mikolaj Jedrzejak */
static const wchar_t mazovia[] = {
    /* Code point 0x9B is "zloty" symbol (z&#0142;), which is not
     *   widely used and for which there is no Unicode equivalent.
     * One reference shows 0xA8 as U+00A7 SECTION SIGN, but we're
     *   told that's incorrect. */
    0x00C7, 0x00FC, 0x00E9, 0x00E2, 0x00E4, 0x00E0, 0x0105, 0x00E7,
    0x00EA, 0x00EB, 0x00E8, 0x00EF, 0x00EE, 0x0107, 0x00C4, 0x0104,
    0x0118, 0x0119, 0x0142, 0x00F4, 0x00F6, 0x0106, 0x00FB, 0x00F9,
    0x015a, 0x00D6, 0x00DC, 0xFFFD, 0x0141, 0x00A5, 0x015b, 0x0192,
    0x0179, 0x017b, 0x00F3, 0x00d3, 0x0144, 0x0143, 0x017a, 0x017c,
    0x00BF, 0x2310, 0x00AC, 0x00BD, 0x00BC, 0x00A1, 0x00AB, 0x00BB,
    0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x2561, 0x2562, 0x2556,
    0x2555, 0x2563, 0x2551, 0x2557, 0x255D, 0x255C, 0x255B, 0x2510,
    0x2514, 0x2534, 0x252C, 0x251C, 0x2500, 0x253C, 0x255E, 0x255F,
    0x255A, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, 0x256C, 0x2567,
    0x2568, 0x2564, 0x2565, 0x2559, 0x2558, 0x2552, 0x2553, 0x256B,
    0x256A, 0x2518, 0x250C, 0x2588, 0x2584, 0x258C, 0x2590, 0x2580,
    0x03B1, 0x00DF, 0x0393, 0x03C0, 0x03A3, 0x03C3, 0x00B5, 0x03C4,
    0x03A6, 0x0398, 0x03A9, 0x03B4, 0x221E, 0x03C6, 0x03B5, 0x2229,
    0x2261, 0x00B1, 0x2265, 0x2264, 0x2320, 0x2321, 0x00F7, 0x2248,
    0x00B0, 0x2219, 0x00B7, 0x221A, 0x207F, 0x00B2, 0x25A0, 0x00A0
};

struct cp_list_item {
    char *name;
    int codepage;
    int cp_size;
    const wchar_t *cp_table;
};

static const struct cp_list_item cp_list[] = {
    {"UTF-8", CP_UTF8},

    {"ISO-8859-1:1998 (Latin-1, West Europe)", 0, 96, iso_8859_1},
    {"ISO-8859-2:1999 (Latin-2, East Europe)", 0, 96, iso_8859_2},
    {"ISO-8859-3:1999 (Latin-3, South Europe)", 0, 96, iso_8859_3},
    {"ISO-8859-4:1998 (Latin-4, North Europe)", 0, 96, iso_8859_4},
    {"ISO-8859-5:1999 (Latin/Cyrillic)", 0, 96, iso_8859_5},
    {"ISO-8859-6:1999 (Latin/Arabic)", 0, 96, iso_8859_6},
    {"ISO-8859-7:1987 (Latin/Greek)", 0, 96, iso_8859_7},
    {"ISO-8859-8:1999 (Latin/Hebrew)", 0, 96, iso_8859_8},
    {"ISO-8859-9:1999 (Latin-5, Turkish)", 0, 96, iso_8859_9},
    {"ISO-8859-10:1998 (Latin-6, Nordic)", 0, 96, iso_8859_10},
    {"ISO-8859-11:2001 (Latin/Thai)", 0, 96, iso_8859_11},
    {"ISO-8859-13:1998 (Latin-7, Baltic)", 0, 96, iso_8859_13},
    {"ISO-8859-14:1998 (Latin-8, Celtic)", 0, 96, iso_8859_14},
    {"ISO-8859-15:1999 (Latin-9, \"euro\")", 0, 96, iso_8859_15},
    {"ISO-8859-16:2001 (Latin-10, Balkan)", 0, 96, iso_8859_16},

    {"KOI8-U", 0, 128, koi8_u},
    {"KOI8-R", 20866},
    {"HP-ROMAN8", 0, 96, roman8},
    {"VSCII", 0, 256, vscii},
    {"DEC-MCS", 0, 96, dec_mcs},

    {"Win1250 (Central European)", 1250},
    {"Win1251 (Cyrillic)", 1251},
    {"Win1252 (Western)", 1252},
    {"Win1253 (Greek)", 1253},
    {"Win1254 (Turkish)", 1254},
    {"Win1255 (Hebrew)", 1255},
    {"Win1256 (Arabic)", 1256},
    {"Win1257 (Baltic)", 1257},
    {"Win1258 (Vietnamese)", 1258},

    {"CP437", 437},
    {"CP620 (Mazovia)", 0, 128, mazovia},
    {"CP819", 28591},
    {"CP852", 852},
    {"CP878", 20866},

    {"Use font encoding", -1},

    {0, 0}
};

static void link_font(WCHAR *line_tbl, WCHAR *font_tbl, WCHAR attr);

/*
 * We keep a collection of reverse mappings from Unicode back to code pages,
 * in the form of array[256] of array[256] of char. These live forever in a
 * local tree234, and we just make a new one whenever we find a need.
 */
typedef struct reverse_mapping {
    int codepage;
    char **blocks;
} reverse_mapping;
static tree234 *reverse_mappings = NULL;

static int reverse_mapping_cmp(void *av, void *bv)
{
    const reverse_mapping *a = (const reverse_mapping *)av;
    const reverse_mapping *b = (const reverse_mapping *)bv;
    if (a->codepage < b->codepage)
        return -1;
    if (a->codepage > b->codepage)
        return +1;
    return 0;
}

static int reverse_mapping_find(void *av, void *bv)
{
    const reverse_mapping *a = (const reverse_mapping *)av;
    int b_codepage = *(const int *)bv;
    if (a->codepage < b_codepage)
        return -1;
    if (a->codepage > b_codepage)
        return +1;
    return 0;
}

static reverse_mapping *get_existing_reverse_mapping(int codepage)
{
    if (!reverse_mappings)
        return NULL;
    return find234(reverse_mappings, &codepage, reverse_mapping_find);
}

static reverse_mapping *make_reverse_mapping_inner(
    int codepage, const wchar_t *mapping)
{
    if (!reverse_mappings)
        reverse_mappings = newtree234(reverse_mapping_cmp);

    reverse_mapping *rmap = snew(reverse_mapping);
    rmap->blocks = snewn(256, char *);
    memset(rmap->blocks, 0, 256 * sizeof(char *));

    for (size_t i = 0; i < 256; i++) {
        /* These special kinds of value correspond to no Unicode character */
        if (DIRECT_CHAR(mapping[i]))
            continue;
        if (DIRECT_FONT(mapping[i]))
            continue;

        size_t chr = mapping[i];
        size_t block = chr >> 8, index = chr & 0xFF;

        if (!rmap->blocks[block]) {
            rmap->blocks[block] = snewn(256, char);
            memset(rmap->blocks[block], 0, 256);
        }
        rmap->blocks[block][index] = i;
    }

    rmap->codepage = codepage;
    reverse_mapping *added = add234(reverse_mappings, rmap);
    assert(added == rmap); /* we already checked it wasn't already in there */
    return added;
}

static void make_reverse_mapping(int codepage, const wchar_t *mapping)
{
    if (get_existing_reverse_mapping(codepage))
        return;                        /* we've already got this one */
    make_reverse_mapping_inner(codepage, mapping);
}

static reverse_mapping *get_reverse_mapping(int codepage)
{
    /*
     * Try harder to get a reverse mapping for a codepage we implement
     * internally via a translation table, by hastily making it if it doesn't
     * already exist.
     */

    reverse_mapping *rmap = get_existing_reverse_mapping(codepage);
    if (rmap)
        return rmap;

    if (codepage < 65536)
        return NULL;
    if (codepage >= 65536 + lenof(cp_list))
        return NULL;
    const struct cp_list_item *cp = &cp_list[codepage - 65536];
    if (!cp->cp_table)
        return NULL;

    wchar_t mapping[256];
    get_unitab(codepage, mapping, 0);
    return make_reverse_mapping_inner(codepage, mapping);
}

void init_ucs(Conf *conf, struct unicode_data *ucsdata)
{
    int i;
    bool used_dtf = false;
    int vtmode;

    /* Decide on the Line and Font codepages */
    ucsdata->line_codepage = decode_codepage(conf_get_str(conf,
                                                          CONF_line_codepage));

    if (ucsdata->font_codepage <= 0) {
        ucsdata->font_codepage=0;
        ucsdata->dbcs_screenfont=false;
    }

    vtmode = conf_get_int(conf, CONF_vtmode);
    if (vtmode == VT_OEMONLY) {
        ucsdata->font_codepage = 437;
        ucsdata->dbcs_screenfont = false;
        if (ucsdata->line_codepage <= 0)
            ucsdata->line_codepage = GetACP();
    } else if (ucsdata->line_codepage <= 0)
        ucsdata->line_codepage = ucsdata->font_codepage;

    /* Collect screen font ucs table */
    if (ucsdata->dbcs_screenfont || ucsdata->font_codepage == 0) {
        get_unitab(ucsdata->font_codepage, ucsdata->unitab_font, 2);
        for (i = 128; i < 256; i++)
            ucsdata->unitab_font[i] = (WCHAR) (CSET_ACP + i);
    } else {
        get_unitab(ucsdata->font_codepage, ucsdata->unitab_font, 1);

        /* CP437 fonts are often broken ... */
        if (ucsdata->font_codepage == 437)
            ucsdata->unitab_font[0] = ucsdata->unitab_font[255] = 0xFFFF;
    }
    if (vtmode == VT_XWINDOWS)
        memcpy(ucsdata->unitab_font + 1, unitab_xterm_std,
               sizeof(unitab_xterm_std));

    /* Collect OEMCP ucs table */
    get_unitab(CP_OEMCP, ucsdata->unitab_oemcp, 1);

    /* Collect CP437 ucs table for SCO acs */
    if (vtmode == VT_OEMANSI || vtmode == VT_XWINDOWS)
        memcpy(ucsdata->unitab_scoacs, ucsdata->unitab_oemcp,
               sizeof(ucsdata->unitab_scoacs));
    else
        get_unitab(437, ucsdata->unitab_scoacs, 1);

    /* Collect line set ucs table */
    if (ucsdata->line_codepage == ucsdata->font_codepage &&
        (ucsdata->dbcs_screenfont ||
         vtmode == VT_POORMAN || ucsdata->font_codepage==0)) {

        /* For DBCS and POOR fonts force direct to font */
        used_dtf = true;
        for (i = 0; i < 32; i++)
            ucsdata->unitab_line[i] = (WCHAR) i;
        for (i = 32; i < 256; i++)
            ucsdata->unitab_line[i] = (WCHAR) (CSET_ACP + i);
        ucsdata->unitab_line[127] = (WCHAR) 127;
    } else {
        get_unitab(ucsdata->line_codepage, ucsdata->unitab_line, 0);
    }

#if 0
    debug("Line cp%d, Font cp%d%s\n", ucsdata->line_codepage,
          ucsdata->font_codepage, ucsdata->dbcs_screenfont ? " DBCS" : "");

    for (i = 0; i < 256; i += 16) {
        for (j = 0; j < 16; j++) {
            debug("%04x%s", ucsdata->unitab_line[i + j], j == 15 ? "" : ",");
        }
        debug("\n");
    }
#endif

    /* VT100 graphics - NB: Broken for non-ascii CP's */
    memcpy(ucsdata->unitab_xterm, ucsdata->unitab_line,
           sizeof(ucsdata->unitab_xterm));
    memcpy(ucsdata->unitab_xterm + '`', unitab_xterm_std,
           sizeof(unitab_xterm_std));
    ucsdata->unitab_xterm['_'] = ' ';

    if (!used_dtf) {
        /* Make sure a reverse mapping exists for this code page. */
        make_reverse_mapping(ucsdata->line_codepage, ucsdata->unitab_line);
    }

    /* Find the line control characters. */
    for (i = 0; i < 256; i++)
        if (ucsdata->unitab_line[i] < ' '
            || (ucsdata->unitab_line[i] >= 0x7F &&
                ucsdata->unitab_line[i] < 0xA0))
            ucsdata->unitab_ctrl[i] = i;
        else
            ucsdata->unitab_ctrl[i] = 0xFF;

    /* Generate line->screen direct conversion links. */
    if (vtmode == VT_OEMANSI || vtmode == VT_XWINDOWS)
        link_font(ucsdata->unitab_scoacs, ucsdata->unitab_oemcp, CSET_OEMCP);

    link_font(ucsdata->unitab_line, ucsdata->unitab_font, CSET_ACP);
    link_font(ucsdata->unitab_scoacs, ucsdata->unitab_font, CSET_ACP);
    link_font(ucsdata->unitab_xterm, ucsdata->unitab_font, CSET_ACP);

    if (vtmode == VT_OEMANSI || vtmode == VT_XWINDOWS) {
        link_font(ucsdata->unitab_line, ucsdata->unitab_oemcp, CSET_OEMCP);
        link_font(ucsdata->unitab_xterm, ucsdata->unitab_oemcp, CSET_OEMCP);
    }

    if (ucsdata->dbcs_screenfont &&
        ucsdata->font_codepage != ucsdata->line_codepage) {
        /* F***ing Microsoft fonts, Japanese and Korean codepage fonts
         * have a currency symbol at 0x5C but their unicode value is
         * still given as U+005C not the correct U+00A5. */
        ucsdata->unitab_line['\\'] = CSET_OEMCP + '\\';
    }

    /* Last chance, if !unicode then try poorman links. */
    if (vtmode != VT_UNICODE) {
        static const char poorman_scoacs[] =
            "CueaaaaceeeiiiAAE**ooouuyOUc$YPsaiounNao?++**!<>###||||++||++++++--|-+||++--|-+----++++++++##||#aBTPEsyt******EN=+><++-=... n2* ";
        static const char poorman_latin1[] =
            " !cL.Y|S\"Ca<--R~o+23'u|.,1o>///?AAAAAAACEEEEIIIIDNOOOOOxOUUUUYPBaaaaaaaceeeeiiiionooooo/ouuuuypy";
        static const char poorman_vt100[] = "*#****o~**+++++-----++++|****L.";

        for (i = 160; i < 256; i++)
            if (!DIRECT_FONT(ucsdata->unitab_line[i]) &&
                ucsdata->unitab_line[i] >= 160 &&
                ucsdata->unitab_line[i] < 256) {
                ucsdata->unitab_line[i] =
                    (WCHAR) (CSET_ACP +
                             poorman_latin1[ucsdata->unitab_line[i] - 160]);
            }
        for (i = 96; i < 127; i++)
            if (!DIRECT_FONT(ucsdata->unitab_xterm[i]))
                ucsdata->unitab_xterm[i] =
                    (WCHAR) (CSET_ACP + poorman_vt100[i - 96]);
        for(i=128;i<256;i++)
            if (!DIRECT_FONT(ucsdata->unitab_scoacs[i]))
                ucsdata->unitab_scoacs[i] =
                    (WCHAR) (CSET_ACP + poorman_scoacs[i - 128]);
    }
}

static void link_font(WCHAR *line_tbl, WCHAR *font_tbl, WCHAR attr)
{
    int font_index, line_index, i;
    for (line_index = 0; line_index < 256; line_index++) {
        if (DIRECT_FONT(line_tbl[line_index]))
            continue;
        for(i = 0; i < 256; i++) {
            font_index = ((32 + i) & 0xFF);
            if (line_tbl[line_index] == font_tbl[font_index]) {
                line_tbl[line_index] = (WCHAR) (attr + font_index);
                break;
            }
        }
    }
}

wchar_t xlat_uskbd2cyrllic(int ch)
{
    static const wchar_t cyrtab[] = {
            0,      1,       2,      3,      4,      5,      6,      7,
            8,      9,      10,     11,     12,     13,     14,     15,
            16,     17,     18,     19,     20,     21,     22,     23,
            24,     25,     26,     27,     28,     29,     30,     31,
            32,     33, 0x042d,     35,     36,     37,     38, 0x044d,
            40,     41,     42, 0x0406, 0x0431, 0x0454, 0x044e, 0x002e,
            48,     49,     50,     51,     52,     53,     54,     55,
            56,     57, 0x0416, 0x0436, 0x0411, 0x0456, 0x042e, 0x002c,
            64, 0x0424, 0x0418, 0x0421, 0x0412, 0x0423, 0x0410, 0x041f,
        0x0420, 0x0428, 0x041e, 0x041b, 0x0414, 0x042c, 0x0422, 0x0429,
        0x0417, 0x0419, 0x041a, 0x042b, 0x0415, 0x0413, 0x041c, 0x0426,
        0x0427, 0x041d, 0x042f, 0x0445, 0x0457, 0x044a,     94, 0x0404,
            96, 0x0444, 0x0438, 0x0441, 0x0432, 0x0443, 0x0430, 0x043f,
        0x0440, 0x0448, 0x043e, 0x043b, 0x0434, 0x044c, 0x0442, 0x0449,
        0x0437, 0x0439, 0x043a, 0x044b, 0x0435, 0x0433, 0x043c, 0x0446,
        0x0447, 0x043d, 0x044f, 0x0425, 0x0407, 0x042a,    126,    127
    };
    return cyrtab[ch&0x7F];
}

static int check_compose_internal(int first, int second, int recurse)
{

    static const struct {
        char first, second;
        wchar_t composed;
    } composetbl[] = {
        {0x2b, 0x2b, 0x0023},
        {0x41, 0x41, 0x0040},
        {0x28, 0x28, 0x005b},
        {0x2f, 0x2f, 0x005c},
        {0x29, 0x29, 0x005d},
        {0x28, 0x2d, 0x007b},
        {0x2d, 0x29, 0x007d},
        {0x2f, 0x5e, 0x007c},
        {0x21, 0x21, 0x00a1},
        {0x43, 0x2f, 0x00a2},
        {0x43, 0x7c, 0x00a2},
        {0x4c, 0x2d, 0x00a3},
        {0x4c, 0x3d, 0x20a4},
        {0x58, 0x4f, 0x00a4},
        {0x58, 0x30, 0x00a4},
        {0x59, 0x2d, 0x00a5},
        {0x59, 0x3d, 0x00a5},
        {0x7c, 0x7c, 0x00a6},
        {0x53, 0x4f, 0x00a7},
        {0x53, 0x21, 0x00a7},
        {0x53, 0x30, 0x00a7},
        {0x22, 0x22, 0x00a8},
        {0x43, 0x4f, 0x00a9},
        {0x43, 0x30, 0x00a9},
        {0x41, 0x5f, 0x00aa},
        {0x3c, 0x3c, 0x00ab},
        {0x2c, 0x2d, 0x00ac},
        {0x2d, 0x2d, 0x00ad},
        {0x52, 0x4f, 0x00ae},
        {0x2d, 0x5e, 0x00af},
        {0x30, 0x5e, 0x00b0},
        {0x2b, 0x2d, 0x00b1},
        {0x32, 0x5e, 0x00b2},
        {0x33, 0x5e, 0x00b3},
        {0x27, 0x27, 0x00b4},
        {0x2f, 0x55, 0x00b5},
        {0x50, 0x21, 0x00b6},
        {0x2e, 0x5e, 0x00b7},
        {0x2c, 0x2c, 0x00b8},
        {0x31, 0x5e, 0x00b9},
        {0x4f, 0x5f, 0x00ba},
        {0x3e, 0x3e, 0x00bb},
        {0x31, 0x34, 0x00bc},
        {0x31, 0x32, 0x00bd},
        {0x33, 0x34, 0x00be},
        {0x3f, 0x3f, 0x00bf},
        {0x60, 0x41, 0x00c0},
        {0x27, 0x41, 0x00c1},
        {0x5e, 0x41, 0x00c2},
        {0x7e, 0x41, 0x00c3},
        {0x22, 0x41, 0x00c4},
        {0x2a, 0x41, 0x00c5},
        {0x41, 0x45, 0x00c6},
        {0x2c, 0x43, 0x00c7},
        {0x60, 0x45, 0x00c8},
        {0x27, 0x45, 0x00c9},
        {0x5e, 0x45, 0x00ca},
        {0x22, 0x45, 0x00cb},
        {0x60, 0x49, 0x00cc},
        {0x27, 0x49, 0x00cd},
        {0x5e, 0x49, 0x00ce},
        {0x22, 0x49, 0x00cf},
        {0x2d, 0x44, 0x00d0},
        {0x7e, 0x4e, 0x00d1},
        {0x60, 0x4f, 0x00d2},
        {0x27, 0x4f, 0x00d3},
        {0x5e, 0x4f, 0x00d4},
        {0x7e, 0x4f, 0x00d5},
        {0x22, 0x4f, 0x00d6},
        {0x58, 0x58, 0x00d7},
        {0x2f, 0x4f, 0x00d8},
        {0x60, 0x55, 0x00d9},
        {0x27, 0x55, 0x00da},
        {0x5e, 0x55, 0x00db},
        {0x22, 0x55, 0x00dc},
        {0x27, 0x59, 0x00dd},
        {0x48, 0x54, 0x00de},
        {0x73, 0x73, 0x00df},
        {0x60, 0x61, 0x00e0},
        {0x27, 0x61, 0x00e1},
        {0x5e, 0x61, 0x00e2},
        {0x7e, 0x61, 0x00e3},
        {0x22, 0x61, 0x00e4},
        {0x2a, 0x61, 0x00e5},
        {0x61, 0x65, 0x00e6},
        {0x2c, 0x63, 0x00e7},
        {0x60, 0x65, 0x00e8},
        {0x27, 0x65, 0x00e9},
        {0x5e, 0x65, 0x00ea},
        {0x22, 0x65, 0x00eb},
        {0x60, 0x69, 0x00ec},
        {0x27, 0x69, 0x00ed},
        {0x5e, 0x69, 0x00ee},
        {0x22, 0x69, 0x00ef},
        {0x2d, 0x64, 0x00f0},
        {0x7e, 0x6e, 0x00f1},
        {0x60, 0x6f, 0x00f2},
        {0x27, 0x6f, 0x00f3},
        {0x5e, 0x6f, 0x00f4},
        {0x7e, 0x6f, 0x00f5},
        {0x22, 0x6f, 0x00f6},
        {0x3a, 0x2d, 0x00f7},
        {0x6f, 0x2f, 0x00f8},
        {0x60, 0x75, 0x00f9},
        {0x27, 0x75, 0x00fa},
        {0x5e, 0x75, 0x00fb},
        {0x22, 0x75, 0x00fc},
        {0x27, 0x79, 0x00fd},
        {0x68, 0x74, 0x00fe},
        {0x22, 0x79, 0x00ff},
        /* Unicode extras. */
        {0x6f, 0x65, 0x0153},
        {0x4f, 0x45, 0x0152},
        /* Compose pairs from UCS */
        {0x41, 0x2D, 0x0100},
        {0x61, 0x2D, 0x0101},
        {0x43, 0x27, 0x0106},
        {0x63, 0x27, 0x0107},
        {0x43, 0x5E, 0x0108},
        {0x63, 0x5E, 0x0109},
        {0x45, 0x2D, 0x0112},
        {0x65, 0x2D, 0x0113},
        {0x47, 0x5E, 0x011C},
        {0x67, 0x5E, 0x011D},
        {0x47, 0x2C, 0x0122},
        {0x67, 0x2C, 0x0123},
        {0x48, 0x5E, 0x0124},
        {0x68, 0x5E, 0x0125},
        {0x49, 0x7E, 0x0128},
        {0x69, 0x7E, 0x0129},
        {0x49, 0x2D, 0x012A},
        {0x69, 0x2D, 0x012B},
        {0x4A, 0x5E, 0x0134},
        {0x6A, 0x5E, 0x0135},
        {0x4B, 0x2C, 0x0136},
        {0x6B, 0x2C, 0x0137},
        {0x4C, 0x27, 0x0139},
        {0x6C, 0x27, 0x013A},
        {0x4C, 0x2C, 0x013B},
        {0x6C, 0x2C, 0x013C},
        {0x4E, 0x27, 0x0143},
        {0x6E, 0x27, 0x0144},
        {0x4E, 0x2C, 0x0145},
        {0x6E, 0x2C, 0x0146},
        {0x4F, 0x2D, 0x014C},
        {0x6F, 0x2D, 0x014D},
        {0x52, 0x27, 0x0154},
        {0x72, 0x27, 0x0155},
        {0x52, 0x2C, 0x0156},
        {0x72, 0x2C, 0x0157},
        {0x53, 0x27, 0x015A},
        {0x73, 0x27, 0x015B},
        {0x53, 0x5E, 0x015C},
        {0x73, 0x5E, 0x015D},
        {0x53, 0x2C, 0x015E},
        {0x73, 0x2C, 0x015F},
        {0x54, 0x2C, 0x0162},
        {0x74, 0x2C, 0x0163},
        {0x55, 0x7E, 0x0168},
        {0x75, 0x7E, 0x0169},
        {0x55, 0x2D, 0x016A},
        {0x75, 0x2D, 0x016B},
        {0x55, 0x2A, 0x016E},
        {0x75, 0x2A, 0x016F},
        {0x57, 0x5E, 0x0174},
        {0x77, 0x5E, 0x0175},
        {0x59, 0x5E, 0x0176},
        {0x79, 0x5E, 0x0177},
        {0x59, 0x22, 0x0178},
        {0x5A, 0x27, 0x0179},
        {0x7A, 0x27, 0x017A},
        {0x47, 0x27, 0x01F4},
        {0x67, 0x27, 0x01F5},
        {0x4E, 0x60, 0x01F8},
        {0x6E, 0x60, 0x01F9},
        {0x45, 0x2C, 0x0228},
        {0x65, 0x2C, 0x0229},
        {0x59, 0x2D, 0x0232},
        {0x79, 0x2D, 0x0233},
        {0x44, 0x2C, 0x1E10},
        {0x64, 0x2C, 0x1E11},
        {0x47, 0x2D, 0x1E20},
        {0x67, 0x2D, 0x1E21},
        {0x48, 0x22, 0x1E26},
        {0x68, 0x22, 0x1E27},
        {0x48, 0x2C, 0x1E28},
        {0x68, 0x2C, 0x1E29},
        {0x4B, 0x27, 0x1E30},
        {0x6B, 0x27, 0x1E31},
        {0x4D, 0x27, 0x1E3E},
        {0x6D, 0x27, 0x1E3F},
        {0x50, 0x27, 0x1E54},
        {0x70, 0x27, 0x1E55},
        {0x56, 0x7E, 0x1E7C},
        {0x76, 0x7E, 0x1E7D},
        {0x57, 0x60, 0x1E80},
        {0x77, 0x60, 0x1E81},
        {0x57, 0x27, 0x1E82},
        {0x77, 0x27, 0x1E83},
        {0x57, 0x22, 0x1E84},
        {0x77, 0x22, 0x1E85},
        {0x58, 0x22, 0x1E8C},
        {0x78, 0x22, 0x1E8D},
        {0x5A, 0x5E, 0x1E90},
        {0x7A, 0x5E, 0x1E91},
        {0x74, 0x22, 0x1E97},
        {0x77, 0x2A, 0x1E98},
        {0x79, 0x2A, 0x1E99},
        {0x45, 0x7E, 0x1EBC},
        {0x65, 0x7E, 0x1EBD},
        {0x59, 0x60, 0x1EF2},
        {0x79, 0x60, 0x1EF3},
        {0x59, 0x7E, 0x1EF8},
        {0x79, 0x7E, 0x1EF9},
        /* Compatible/possibles from UCS */
        {0x49, 0x4A, 0x0132},
        {0x69, 0x6A, 0x0133},
        {0x4C, 0x4A, 0x01C7},
        {0x4C, 0x6A, 0x01C8},
        {0x6C, 0x6A, 0x01C9},
        {0x4E, 0x4A, 0x01CA},
        {0x4E, 0x6A, 0x01CB},
        {0x6E, 0x6A, 0x01CC},
        {0x44, 0x5A, 0x01F1},
        {0x44, 0x7A, 0x01F2},
        {0x64, 0x7A, 0x01F3},
        {0x2E, 0x2E, 0x2025},
        {0x21, 0x21, 0x203C},
        {0x3F, 0x21, 0x2048},
        {0x21, 0x3F, 0x2049},
        {0x52, 0x73, 0x20A8},
        {0x4E, 0x6F, 0x2116},
        {0x53, 0x4D, 0x2120},
        {0x54, 0x4D, 0x2122},
        {0x49, 0x49, 0x2161},
        {0x49, 0x56, 0x2163},
        {0x56, 0x49, 0x2165},
        {0x49, 0x58, 0x2168},
        {0x58, 0x49, 0x216A},
        {0x69, 0x69, 0x2171},
        {0x69, 0x76, 0x2173},
        {0x76, 0x69, 0x2175},
        {0x69, 0x78, 0x2178},
        {0x78, 0x69, 0x217A},
        {0x31, 0x30, 0x2469},
        {0x31, 0x31, 0x246A},
        {0x31, 0x32, 0x246B},
        {0x31, 0x33, 0x246C},
        {0x31, 0x34, 0x246D},
        {0x31, 0x35, 0x246E},
        {0x31, 0x36, 0x246F},
        {0x31, 0x37, 0x2470},
        {0x31, 0x38, 0x2471},
        {0x31, 0x39, 0x2472},
        {0x32, 0x30, 0x2473},
        {0x31, 0x2E, 0x2488},
        {0x32, 0x2E, 0x2489},
        {0x33, 0x2E, 0x248A},
        {0x34, 0x2E, 0x248B},
        {0x35, 0x2E, 0x248C},
        {0x36, 0x2E, 0x248D},
        {0x37, 0x2E, 0x248E},
        {0x38, 0x2E, 0x248F},
        {0x39, 0x2E, 0x2490},
        {0x64, 0x61, 0x3372},
        {0x41, 0x55, 0x3373},
        {0x6F, 0x56, 0x3375},
        {0x70, 0x63, 0x3376},
        {0x70, 0x41, 0x3380},
        {0x6E, 0x41, 0x3381},
        {0x6D, 0x41, 0x3383},
        {0x6B, 0x41, 0x3384},
        {0x4B, 0x42, 0x3385},
        {0x4D, 0x42, 0x3386},
        {0x47, 0x42, 0x3387},
        {0x70, 0x46, 0x338A},
        {0x6E, 0x46, 0x338B},
        {0x6D, 0x67, 0x338E},
        {0x6B, 0x67, 0x338F},
        {0x48, 0x7A, 0x3390},
        {0x66, 0x6D, 0x3399},
        {0x6E, 0x6D, 0x339A},
        {0x6D, 0x6D, 0x339C},
        {0x63, 0x6D, 0x339D},
        {0x6B, 0x6D, 0x339E},
        {0x50, 0x61, 0x33A9},
        {0x70, 0x73, 0x33B0},
        {0x6E, 0x73, 0x33B1},
        {0x6D, 0x73, 0x33B3},
        {0x70, 0x56, 0x33B4},
        {0x6E, 0x56, 0x33B5},
        {0x6D, 0x56, 0x33B7},
        {0x6B, 0x56, 0x33B8},
        {0x4D, 0x56, 0x33B9},
        {0x70, 0x57, 0x33BA},
        {0x6E, 0x57, 0x33BB},
        {0x6D, 0x57, 0x33BD},
        {0x6B, 0x57, 0x33BE},
        {0x4D, 0x57, 0x33BF},
        {0x42, 0x71, 0x33C3},
        {0x63, 0x63, 0x33C4},
        {0x63, 0x64, 0x33C5},
        {0x64, 0x42, 0x33C8},
        {0x47, 0x79, 0x33C9},
        {0x68, 0x61, 0x33CA},
        {0x48, 0x50, 0x33CB},
        {0x69, 0x6E, 0x33CC},
        {0x4B, 0x4B, 0x33CD},
        {0x4B, 0x4D, 0x33CE},
        {0x6B, 0x74, 0x33CF},
        {0x6C, 0x6D, 0x33D0},
        {0x6C, 0x6E, 0x33D1},
        {0x6C, 0x78, 0x33D3},
        {0x6D, 0x62, 0x33D4},
        {0x50, 0x48, 0x33D7},
        {0x50, 0x52, 0x33DA},
        {0x73, 0x72, 0x33DB},
        {0x53, 0x76, 0x33DC},
        {0x57, 0x62, 0x33DD},
        {0x66, 0x66, 0xFB00},
        {0x66, 0x69, 0xFB01},
        {0x66, 0x6C, 0xFB02},
        {0x73, 0x74, 0xFB06},
        {0, 0, 0}
    }, *c;

    int nc = -1;

    for (c = composetbl; c->first; c++) {
        if (c->first == first && c->second == second)
            return c->composed;
    }

    if (recurse == 0) {
        nc = check_compose_internal(second, first, 1);
        if (nc == -1)
            nc = check_compose_internal(toupper((unsigned char)first),
                                        toupper((unsigned char)second), 1);
        if (nc == -1)
            nc = check_compose_internal(toupper((unsigned char)second),
                                        toupper((unsigned char)first), 1);
    }
    return nc;
}

int check_compose(int first, int second)
{
    return check_compose_internal(first, second, 0);
}

int decode_codepage(const char *cp_name)
{
    const char *s, *d;
    const struct cp_list_item *cpi;
    int codepage = -1;
    CPINFO cpinfo;

    if (!cp_name || !*cp_name)
        return CP_UTF8;                /* default */

    for (cpi = cp_list; cpi->name; cpi++) {
        s = cp_name;
        d = cpi->name;
        for (;;) {
            while (*s && !isalnum((unsigned char)*s) && *s != ':')
                s++;
            while (*d && !isalnum((unsigned char)*d) && *d != ':')
                d++;
            if (*s == 0) {
                codepage = cpi->codepage;
                if (codepage == CP_UTF8)
                    goto break_break;
                if (codepage == -1)
                    return codepage;
                if (codepage == 0) {
                    codepage = 65536 + (cpi - cp_list);
                    goto break_break;
                }

                if (GetCPInfo(codepage, &cpinfo) != 0)
                    goto break_break;
            }
            if (tolower((unsigned char)*s++) != tolower((unsigned char)*d++))
                break;
        }
    }

    d = cp_name;
    if (tolower((unsigned char)d[0]) == 'c' &&
        tolower((unsigned char)d[1]) == 'p')
        d += 2;
    if (tolower((unsigned char)d[0]) == 'i' &&
        tolower((unsigned char)d[1]) == 'b' &&
        tolower((unsigned char)d[2]) == 'm')
        d += 3;
    for (s = d; *s >= '0' && *s <= '9'; s++);
    if (*s == 0 && s != d)
        codepage = atoi(d);            /* CP999 or IBM999 */

    if (codepage == CP_ACP)
        codepage = GetACP();
    if (codepage == CP_OEMCP)
        codepage = GetOEMCP();
    if (codepage > 65535)
        codepage = -2;

  break_break:;
    if (codepage != -1) {
        if (codepage != CP_UTF8 && codepage < 65536) {
            if (GetCPInfo(codepage, &cpinfo) == 0) {
                codepage = -2;
            } else if (cpinfo.MaxCharSize > 1)
                codepage = -3;
        }
    }
    if (codepage == -1 && *cp_name)
        codepage = -2;
    return codepage;
}

const char *cp_name(int codepage)
{
    const struct cp_list_item *cpi, *cpno;
    static char buf[32];

    if (codepage == -1) {
        sprintf(buf, "Use font encoding");
        return buf;
    }

    if (codepage > 0 && codepage < 65536)
        sprintf(buf, "CP%03d", codepage);
    else
        *buf = 0;

    if (codepage >= 65536) {
        cpno = 0;
        for (cpi = cp_list; cpi->name; cpi++)
            if (cpi == cp_list + (codepage - 65536)) {
                cpno = cpi;
                break;
            }
        if (cpno)
            for (cpi = cp_list; cpi->name; cpi++) {
                if (cpno->cp_table == cpi->cp_table)
                    return cpi->name;
            }
    } else {
        for (cpi = cp_list; cpi->name; cpi++) {
            if (codepage == cpi->codepage)
                return cpi->name;
        }
    }
    return buf;
}

/*
 * Return the nth code page in the list, for use in the GUI
 * configurer.
 */
const char *cp_enumerate(int index)
{
    if (index < 0 || index >= lenof(cp_list))
        return NULL;
    return cp_list[index].name;
}

void get_unitab(int codepage, wchar_t *unitab, int ftype)
{
    char tbuf[4];
    int i, max = 256, flg = MB_ERR_INVALID_CHARS;

    if (ftype)
        flg |= MB_USEGLYPHCHARS;
    if (ftype == 2)
        max = 128;

    if (codepage == CP_UTF8) {
        for (i = 0; i < max; i++)
            unitab[i] = i;
        return;
    }

    if (codepage == CP_ACP)
        codepage = GetACP();
    else if (codepage == CP_OEMCP)
        codepage = GetOEMCP();

    if (codepage > 0 && codepage < 65536) {
        for (i = 0; i < max; i++) {
            tbuf[0] = i;

            if (mb_to_wc(codepage, flg, tbuf, 1, unitab + i, 1)
                != 1)
                unitab[i] = 0xFFFD;
        }
    } else {
        int j = 256 - cp_list[codepage & 0xFFFF].cp_size;
        for (i = 0; i < max; i++)
            unitab[i] = i;
        for (i = j; i < max; i++)
            unitab[i] = cp_list[codepage & 0xFFFF].cp_table[i - j];
    }
}

int wc_to_mb(int codepage, int flags, const wchar_t *wcstr, int wclen,
             char *mbstr, int mblen, const char *defchr)
{
    reverse_mapping *rmap = get_reverse_mapping(codepage);

    if (rmap) {
        /* Do this by array lookup if we can. */
        if (wclen < 0) {
            for (wclen = 0; wcstr[wclen++] ;);   /* will include the NUL */
        }
        char *p;
        int i;
        for (p = mbstr, i = 0; i < wclen; i++) {
            wchar_t ch = wcstr[i];
            int by;
            const char *p1;

            #define WRITECH(chr) do             \
            {                                   \
                assert(p - mbstr < mblen);      \
                *p++ = (char)(chr);             \
            } while (0)

            if ((p1 = rmap->blocks[(ch >> 8) & 0xFF]) != NULL &&
                (by = p1[ch & 0xFF]) != '\0')
                WRITECH(by);
            else if (ch < 0x80)
                WRITECH(ch);
            else if (defchr)
                for (const char *q = defchr; *q; q++)
                    WRITECH(*q);
#if 1
            else
                WRITECH('.');
#endif

            #undef WRITECH
        }
        return p - mbstr;
    } else {
        int defused, ret;
        ret = WideCharToMultiByte(codepage, flags, wcstr, wclen,
                                  mbstr, mblen, defchr, &defused);
        if (ret)
            return ret;

#ifdef LEGACY_WINDOWS
        /*
         * Fallback for legacy platforms too old to support UTF-8: if
         * the codepage is UTF-8, we can do the translation ourselves.
         */
        if (codepage == CP_UTF8 && mblen > 0 && wclen > 0) {
            size_t remaining = mblen;
            char *p = mbstr;

            while (wclen > 0) {
                unsigned long wc = (wclen--, *wcstr++);
                if (wclen > 0 && IS_SURROGATE_PAIR(wc, *wcstr)) {
                    wc = FROM_SURROGATES(wc, *wcstr);
                    wclen--, wcstr++;
                }

                char utfbuf[6];
                size_t utflen = encode_utf8(utfbuf, wc);
                if (utflen <= remaining) {
                    memcpy(p, utfbuf, utflen);
                    p += utflen;
                    remaining -= utflen;
                } else {
                    return p - mbstr;
                }
            }

            return p - mbstr;
        }
#endif

        /* No other fallbacks are available */
        return 0;
    }
}

int mb_to_wc(int codepage, int flags, const char *mbstr, int mblen,
             wchar_t *wcstr, int wclen)
{
    if (codepage >= 65536) {
        /* Character set not known to Windows, so we'll have to
         * translate it ourself */
        size_t index = codepage - 65536;
        if (index >= lenof(cp_list))
            return 0;
        const struct cp_list_item *cp = &cp_list[index];
        if (!cp->cp_table)
            return 0;

        size_t remaining = wclen;
        wchar_t *p = wcstr;
        unsigned tablebase = 256 - cp->cp_size;

        while (mblen > 0) {
            mblen--;
            unsigned c = 0xFF & *mbstr++;
            wchar_t wc = (c < tablebase ? c : cp->cp_table[c - tablebase]);
            if (remaining > 0) {
                remaining--;
                *p++ = wc;
            } else {
                return p - wcstr;
            }
        }

        return p - wcstr;
    }

    int ret = MultiByteToWideChar(codepage, flags, mbstr, mblen, wcstr, wclen);
    if (ret)
        return ret;

#ifdef LEGACY_WINDOWS
    /*
     * Fallback for legacy platforms too old to support UTF-8: if the
     * codepage is UTF-8, we can do the translation ourselves.
     */
    if (codepage == CP_UTF8 && mblen > 0 && wclen > 0) {
        size_t remaining = wclen;
        wchar_t *p = wcstr;

        while (mblen > 0) {
            char utfbuf[7];
            int thissize = mblen < 6 ? mblen : 6;
            memcpy(utfbuf, mbstr, thissize);
            utfbuf[thissize] = '\0';

            const char *utfptr = utfbuf;
            wchar_t wcbuf[2];
            size_t nwc = decode_utf8_to_wchar(&utfptr, wcbuf);

            for (size_t i = 0; i < nwc; i++) {
                if (remaining > 0) {
                    remaining--;
                    *p++ = wcbuf[i];
                } else {
                    return p - wcstr;
                }
            }

            mbstr += (utfptr - utfbuf);
            mblen -= (utfptr - utfbuf);
        }

        return p - wcstr;
    }
#endif

    /* No other fallbacks are available */
    return 0;
}

bool is_dbcs_leadbyte(int codepage, char byte)
{
    return IsDBCSLeadByteEx(codepage, byte);
}