| 1 | /* |
| 2 | * Copyright (C) 1997,2000,2003 Ian Jackson |
| 3 | * This file is part of ipif, part of userv-utils |
| 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 | */ |
| 19 | |
| 20 | #include <stdio.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <assert.h> |
| 23 | #include <string.h> |
| 24 | #include <sysexits.h> |
| 25 | |
| 26 | #include "hex.h" |
| 27 | |
| 28 | const char *tohex(uint8_t *data, int len, char *buf) { |
| 29 | char *p; |
| 30 | |
| 31 | for (p= buf; |
| 32 | len>0; |
| 33 | len--, data++, p+=2) |
| 34 | sprintf(p,"%02x",*data); |
| 35 | return buf; |
| 36 | } |
| 37 | |
| 38 | void unhex(const char *what, const char *txt, uint8_t *datar, int *lenr, |
| 39 | int minlen, int maxlen) { |
| 40 | int l, v; |
| 41 | char buf[3], *ep; |
| 42 | |
| 43 | l= strlen(txt); |
| 44 | if (l%1) { fprintf(stderr,"odd number of hex digits in %s\n",what); exit(EX_DATAERR); } |
| 45 | l>>=1; |
| 46 | if (l<minlen) { fprintf(stderr,"too few hex digits in %s\n",what); exit(EX_DATAERR); } |
| 47 | if (l>maxlen) { fprintf(stderr,"too many hex digits in %s\n",what); exit(EX_DATAERR); } |
| 48 | |
| 49 | if (lenr) *lenr= l; |
| 50 | while (l) { |
| 51 | buf[0]= *txt++; |
| 52 | buf[1]= *txt++; |
| 53 | buf[2]= 0; |
| 54 | v= strtoul(buf,&ep,16); |
| 55 | if (*ep) { fprintf(stderr,"not hex digit in %s: %c\n",what,*ep); exit(EX_DATAERR); } |
| 56 | *datar++= v; |
| 57 | l--; |
| 58 | } |
| 59 | } |