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