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1 | /* |
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2 | * Copyright (C) 1997,2000,2003 Ian Jackson |
3 | * This file is part of ipif, part of userv-utils |
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4 | * |
5 | * This is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation; either version 2 of the License, or |
8 | * (at your option) any later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, but |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | * General Public License for more details. |
14 | * |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with userv-utils; if not, write to the Free Software |
17 | * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
18 | */ |
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19 | |
20 | #include <stdio.h> |
21 | #include <stdlib.h> |
22 | #include <assert.h> |
23 | #include <sysexits.h> |
24 | |
25 | #include "hex.h" |
26 | |
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27 | const char *tohex(uint8_t *data, int len, char *buf) { |
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28 | char *p; |
29 | |
30 | for (p= buf; |
31 | len>0; |
32 | len--, data++, p+=2) |
33 | sprintf(p,"%02x",*data); |
34 | return buf; |
35 | } |
36 | |
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37 | void unhex(const char *what, const char *txt, uint8_t *datar, int *lenr, |
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38 | int minlen, int maxlen) { |
39 | int l, v; |
40 | char buf[3], *ep; |
41 | |
42 | l= strlen(txt); |
43 | if (l%1) { fprintf(stderr,"odd number of hex digits in %s\n",what); exit(EX_DATAERR); } |
44 | l>>=1; |
45 | if (l<minlen) { fprintf(stderr,"too few hex digits in %s\n",what); exit(EX_DATAERR); } |
46 | if (l>maxlen) { fprintf(stderr,"too many hex digits in %s\n",what); exit(EX_DATAERR); } |
47 | |
48 | if (lenr) *lenr= l; |
49 | while (l) { |
50 | buf[0]= *txt++; |
51 | buf[1]= *txt++; |
52 | buf[2]= 0; |
53 | v= strtoul(buf,&ep,16); |
54 | if (*ep) { fprintf(stderr,"not hex digit in %s: %c\n",what,*ep); exit(EX_DATAERR); } |
55 | *datar++= v; |
56 | l--; |
57 | } |
58 | } |