1 /* Copyright (C) 2011 Red Hat, Inc.
2    This file is part of elfutils.
3    Written by Marek Polacek <mpolacek@redhat.com>, 2011.
4 
5    This file is free software; you can redistribute it and/or modify
6    it under the terms of the GNU General Public License as published by
7    the Free Software Foundation; either version 3 of the License, or
8    (at your option) any later version.
9 
10    elfutils 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
13    GNU General Public License for more details.
14 
15    You should have received a copy of the GNU General Public License
16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
17 
18 #ifdef HAVE_CONFIG_H
19 # include <config.h>
20 #endif
21 
22 #include ELFUTILS_HEADER(dwfl)
23 #include <assert.h>
24 #include <dwarf.h>
25 #include <fcntl.h>
26 #include <stdio.h>
27 #include <unistd.h>
28 
29 
30 int
31 main (int argc, char *argv[])
32 {
33   int cnt;
34 
35   for (cnt = 1; cnt < argc; ++cnt)
36     {
37       Dwarf_Off offset = 0;
38       size_t len;
39 
40       int fd = open (argv[cnt], O_RDONLY);
41       if (fd == -1)
42 	{
43 	  printf ("cannot open '%s': %m\n", argv[cnt]);
44 	  return 1;
45 	}
46 
47       Dwarf *dbg = dwarf_begin (fd, DWARF_C_READ);
48       if (dbg == NULL)
49 	{
50 	  printf ("%s not usable: %s\n", argv[cnt], dwarf_errmsg (-1));
51 	  close (fd);
52 	  return 1;
53 	}
54 
55       /* Try to use NULL Dwarf object.  */
56       const char *str = dwarf_getstring (NULL, offset, &len);
57       assert (str == NULL);
58 
59       /* Use insane offset.  */
60       str = dwarf_getstring (dbg, ~0UL, &len);
61       assert (str == NULL);
62 
63       /* Now do some real work.  */
64       for (int i = 0; i < 100; ++i)
65 	{
66 	  str = dwarf_getstring (dbg, offset, &len);
67 	  puts (str);
68 
69 	  /* Advance.  */
70 	  offset += len + 1;
71 	}
72 
73       dwarf_end (dbg);
74       close (fd);
75     }
76 
77   return 0;
78 }
79