1 /* Return string associated with given attribute.
2 Copyright (C) 2003, 2004 Red Hat, Inc.
3 Written by Ulrich Drepper <drepper@redhat.com>, 2003.
4
5 This program is Open Source software; you can redistribute it and/or
6 modify it under the terms of the Open Software License version 1.0 as
7 published by the Open Source Initiative.
8
9 You should have received a copy of the Open Software License along
10 with this program; if not, you may obtain a copy of the Open Software
11 License version 1.0 from http://www.opensource.org/licenses/osl.php or
12 by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
13 3001 King Ranch Road, Ukiah, CA 95482. */
14
15 #ifdef HAVE_CONFIG_H
16 # include <config.h>
17 #endif
18
19 #include <dwarf.h>
20 #include "libdwP.h"
21
22
23 const char *
dwarf_formstring(attrp)24 dwarf_formstring (attrp)
25 Dwarf_Attribute *attrp;
26 {
27 /* Ignore earlier errors. */
28 if (attrp == NULL)
29 return NULL;
30
31 /* We found it. Now determine where the string is stored. */
32 if (attrp->form == DW_FORM_string)
33 /* A simple inlined string. */
34 return (const char *) attrp->valp;
35
36 Dwarf *dbg = attrp->cu->dbg;
37
38 if (unlikely (attrp->form != DW_FORM_strp)
39 || dbg->sectiondata[IDX_debug_str] == NULL)
40 {
41 invalid_error:
42 __libdw_seterrno (DWARF_E_NO_STRING);
43 return NULL;
44 }
45
46 uint64_t off;
47 // XXX We need better boundary checks.
48 if (attrp->cu->offset_size == 8)
49 off = read_8ubyte_unaligned (dbg, attrp->valp);
50 else
51 off = read_4ubyte_unaligned (dbg, attrp->valp);
52
53 if (off >= dbg->sectiondata[IDX_debug_str]->d_size)
54 goto invalid_error;
55
56 return (const char *) dbg->sectiondata[IDX_debug_str]->d_buf + off;
57 }
58