114 lines
2.5 KiB
C
114 lines
2.5 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* 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 GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <mes/lib.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#define memset xmemset
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#define calloc xcalloc
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void *
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memset (void *s, int c, size_t n)
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{
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char *p = s;
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while (n--)
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*p++ = c;
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return s;
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}
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void *
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calloc (size_t nmemb, size_t size)
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{
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size_t count = nmemb * size;
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void *p = malloc (count);
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memset (p, 0, count);
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return p;
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}
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/* {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'} */
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char little_endian_table[16] =
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{ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46 };
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char *
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little_endian (unsigned value, char *c, int number_of_bytes)
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{
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char table[16] =
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{ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46 };
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switch (number_of_bytes)
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{
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case 4:
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{
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c[6] = table[value >> 28];
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c[7] = table[(value >> 24) % 16];
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}
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case 3:
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{
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c[4] = table[(value >> 20) % 16];
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c[5] = table[(value >> 16) % 16];
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}
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case 2:
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{
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c[2] = table[(value >> 12) % 16];
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c[3] = table[(value >> 8) % 16];
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}
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case 1:
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{
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c[0] = table[(value >> 4) % 16];
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c[1] = table[value % 16];
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break;
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}
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default:
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return "invalid";
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}
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return c;
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}
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int
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main ()
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{
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char table[3] = { '0', '1', '2' };
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char *s;
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s = calloc (10, sizeof (char));
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eputs ("2=");
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eputs (little_endian (2, s, 1));
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eputs ("\n");
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if (strcmp (s, "02"))
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return 1;
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eputs ("8=");
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eputs (little_endian (8, s, 2));
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eputs ("\n");
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if (strcmp (s, "0800"))
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return 2;
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eputs ("16=");
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eputs (little_endian (16, s, 4));
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eputs ("\n");
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if (strcmp (s, "10000000"))
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return 3;
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return 0;
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}
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