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/*
* spreadspace avr utils
*
*
* Copyright (C) 2012 Christian Pointner <equinox@spreadspace.org>
*
* This file is part of spreadspace avr utils.
*
* spreadspace avr utils is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* spreadspace avr utils is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
*/
#include <ctype.h>
#include <stdio.h>
#define MAX_KEY_LEN 7
char generate_csum(char* key)
{
return 0xFF;
}
int main(int argc, char* argv[])
{
char* line = NULL;
size_t len = 0;
for(;;) {
ssize_t ret = getline(&line, &len, stdin);
if(ret <= 0) return 0;
int i;
for(i=0; i<len; ++i) {
if(!isxdigit(line[i])) {
line[i] = 0;
break;
}
}
if(i & 1 || i == 0 || i > MAX_KEY_LEN*2) {
fprintf(stderr, "ignoring invalid key (odd number of digits or empty string or too long): %s\n", line);
continue;
}
char key[MAX_KEY_LEN+1];
int j;
char tmp[3];
tmp[2] = 0;
for(j = 0; j<(i/2); ++j) {
tmp[0] = line[j*2];
tmp[1] = line[j*2 + 1];
key[j] = (char)strtoul(tmp, NULL, 16);
}
for(j=i/2; j < MAX_KEY_LEN; ++j) {
key[j] = 0;
}
key[MAX_KEY_LEN] = generate_csum(key);
ret = fwrite(key, MAX_KEY_LEN+1, 1, stdout);
}
return 0;
}
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