1 /*
2 * mapper.c -- simple file that mmap()s a file region and prints it
3 *
4 * Copyright (C) 1998,2000,2001 Alessandro Rubini
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
19 */
20
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <unistd.h>
25 #include <sys/mman.h>
26 #include <errno.h>
27 #include <limits.h>
28
29 int main(int argc, char **argv)
30 {
31 char *fname;
32 FILE *f;
33 unsigned long offset, len;
34 void *address;
35
36 if (argc !=4
37 || sscanf(argv[2],"%li", &offset) != 1
38 || sscanf(argv[3],"%li", &len) != 1) {
39 fprintf(stderr, "%s: Usage \"%s <file> <offset> <len>\"\n", argv[0],
40 argv[0]);
41 exit(1);
42 }
43 /* the offset might be big (e.g., PCI devices), but conversion trims it */
44 if (offset == INT_MAX) {
45 if (argv[2][1]=='x')
46 sscanf(argv[2]+2, "%lx", &offset);
47 else
48 sscanf(argv[2], "%lu", &offset);
49 }
50
51 fname=argv[1];
52
53 if (!(f=fopen(fname,"r"))) {
54 fprintf(stderr, "%s: %s: %s\n", argv[0], fname, strerror(errno));
55 exit(1);
56 }
57
58 address=mmap(0, len, PROT_READ, MAP_FILE | MAP_PRIVATE, fileno(f), offset);
59
60 if (address == (void *)-1) {
61 fprintf(stderr,"%s: mmap(): %s\n",argv[0],strerror(errno));
62 exit(1);
63 }
64 fclose(f);
65 fprintf(stderr, "mapped \"%s\" from %lu (0x%08lx) to %lu (0x%08lx)\n",
66 fname, offset, offset, offset+len, offset+len);
67
68 fwrite(address, 1, len, stdout);
69 return 0;
70 }
71
72
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