| /******************************************************************************/ |
| /* */ |
| /* Copyright (c) International Business Machines Corp., 2008 */ |
| /* */ |
| /* This program 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 2 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 this program; if not, write to the Free Software */ |
| /* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ |
| /* */ |
| /******************************************************************************/ |
| |
| /* |
| * File: unhex.c |
| * Author: Serge Hallyn |
| * Purpose: Read a 40 char hex value from stdin, output 20 char byte |
| * value on stdout. |
| */ |
| |
| #include <stdio.h> |
| #include <unistd.h> |
| |
| int main(int argc, char *argv[]) |
| { |
| char in[41], out[20]; |
| unsigned int v; |
| int i, ret; |
| |
| ret = read(STDIN_FILENO, in, 40); |
| if (ret != 40) |
| return 1; |
| in[40] = '\0'; |
| for (i = 0; i < 20; i++) { |
| sscanf(&in[2*i], "%02x", &v); |
| out[i] = v; |
| } |
| write(STDOUT_FILENO, out, 20); |
| return 0; |
| } |