126 lines
2.7 KiB
C
126 lines
2.7 KiB
C
/*
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* Copyright (c) 2001-2009 Stephen Williams (steve@icarus.com)
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*
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* This source code is free software; you can redistribute it
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* and/or modify it in source code form under the terms of the GNU
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* General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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# include <stdio.h>
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/*
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* The hex_digits table is not a functor truth table per say, but a
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* map of a 4-vbit value to a hex digit. The table handles the display
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* of x, X, z, Z, etc.
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*/
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static void draw_hex_table()
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{
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unsigned idx;
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printf("extern const char hex_digits[256] = {\n");
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for (idx = 0 ; idx < 256 ; idx += 1) {
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unsigned cnt_z = 0, cnt_x = 0;
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unsigned bv = 0, bdx;
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for (bdx = 0 ; bdx < 4 ; bdx += 1) {
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switch ((idx >> (bdx * 2)) & 3) {
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case 0:
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break;
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case 1:
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bv |= 1<<bdx;
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break;
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case 2:
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cnt_x += 1;
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break;
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case 3:
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cnt_z += 1;
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break;
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}
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}
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if (cnt_z == 4)
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printf(" 'z',");
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else if (cnt_x == 4)
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printf(" 'x',");
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else if ((cnt_z > 0) && (cnt_x == 0))
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printf(" 'Z',");
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else if (cnt_x > 0)
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printf(" 'X',");
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else
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printf(" '%c',", "0123456789abcdef"[bv]);
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if (((idx+1) % 8) == 0)
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printf("\n");
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}
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printf("};\n");
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}
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static void draw_oct_table()
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{
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unsigned idx;
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printf("extern const char oct_digits[64] = {\n");
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for (idx = 0 ; idx < 64 ; idx += 1) {
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unsigned cnt_z = 0, cnt_x = 0;
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unsigned bv = 0, bdx;
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for (bdx = 0 ; bdx < 3 ; bdx += 1) {
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switch ((idx >> (bdx * 2)) & 3) {
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case 0:
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break;
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case 1:
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bv |= 1<<bdx;
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break;
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case 2:
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cnt_x += 1;
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break;
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case 3:
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cnt_z += 1;
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break;
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}
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}
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if (cnt_z == 3)
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printf(" 'z',");
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else if (cnt_x == 3)
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printf(" 'x',");
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else if ((cnt_z > 0) && (cnt_x == 0))
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printf(" 'Z',");
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else if (cnt_x > 0)
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printf(" 'X',");
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else
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printf(" '%c',", "01234567"[bv]);
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if (((idx+1) % 8) == 0)
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printf("\n");
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}
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printf("};\n");
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}
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int main()
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{
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draw_hex_table();
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draw_oct_table();
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return 0;
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}
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