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/*
* This file is part of ipif, part of userv-utils
*
* Copyright 1996-2013 Ian Jackson <ijackson@chiark.greenend.org.uk>
* Copyright 1998 David Damerell <damerell@chiark.greenend.org.uk>
* Copyright 1999,2003
* Chancellor Masters and Scholars of the University of Cambridge
* Copyright 2010 Tony Finch <fanf@dotat.at>
*
* This 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
* (at your option) any later version.
*
* This program 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 userv-utils; if not, see http://www.gnu.org/licenses/.
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <sysexits.h>
#include "hex.h"
const char *tohex(uint8_t *data, int len, char *buf) {
char *p;
for (p= buf;
len>0;
len--, data++, p+=2)
sprintf(p,"%02x",*data);
return buf;
}
void unhex(const char *what, const char *txt, uint8_t *datar, int *lenr,
int minlen, int maxlen) {
int l, v;
char buf[3], *ep;
l= strlen(txt);
if (l%1) { fprintf(stderr,"odd number of hex digits in %s\n",what); exit(EX_DATAERR); }
l>>=1;
if (l<minlen) { fprintf(stderr,"too few hex digits in %s\n",what); exit(EX_DATAERR); }
if (l>maxlen) { fprintf(stderr,"too many hex digits in %s\n",what); exit(EX_DATAERR); }
if (lenr) *lenr= l;
while (l) {
buf[0]= *txt++;
buf[1]= *txt++;
buf[2]= 0;
v= strtoul(buf,&ep,16);
if (*ep) { fprintf(stderr,"not hex digit in %s: %c\n",what,*ep); exit(EX_DATAERR); }
*datar++= v;
l--;
}
}
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