/* Test program for elf_strptr function.
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Copyright (C) 2015 Red Hat, Inc.
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This file is part of elfutils.
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This file is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include ELFUTILS_HEADER(elf)
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#include <gelf.h>
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int
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main (int argc, char *argv[])
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{
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if (argc != 2)
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{
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printf ("No ELF file given as argument");
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exit (1);
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}
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const char *fname = argv[1];
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// Initialize libelf.
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elf_version (EV_CURRENT);
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/* Read the ELF from disk now. */
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int fd = open (fname, O_RDONLY);
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if (fd == -1)
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{
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printf ("cannot open `%s' read-only: %s\n", fname, strerror (errno));
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exit (1);
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}
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Elf *elf = elf_begin (fd, ELF_C_READ, NULL);
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if (elf == NULL)
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{
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printf ("cannot create ELF descriptor read-only: %s\n", elf_errmsg (-1));
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exit (1);
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}
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size_t ndx;
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if (elf_getshdrstrndx (elf, &ndx) != 0)
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{
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printf ("cannot get section header table index: %s\n", elf_errmsg (-1));
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exit (1);
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}
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if (ndx == SHN_UNDEF)
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{
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printf ("ELF file `%s' doesn't have a section header table index", fname);
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exit (1);
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}
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Elf_Scn *scn = elf_getscn (elf, ndx);
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if (scn == NULL)
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{
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printf ("Couldn't get section %zd: %s\n", ndx, elf_errmsg (-1));
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exit (1);
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}
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void print_strings (void)
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{
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GElf_Shdr shdr_mem;
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GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
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printf ("Strings in section %zd (%s):\n", ndx,
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((shdr->sh_flags & SHF_COMPRESSED) != 0
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? "compressed" : "uncompressed"));
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size_t off = 0;
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const char *str = elf_strptr (elf, ndx, off);
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while (str != NULL)
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{
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printf ("[%zx] '%s'\n", off, str);
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off += strlen (str) + 1;
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str = elf_strptr (elf, ndx, off);
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}
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}
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if (elf_compress (scn, ELFCOMPRESS_ZLIB, 0) < 0)
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{
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printf ("Couldn't compress section %zd: %s\n", ndx, elf_errmsg (-1));
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exit (1);
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}
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print_strings ();
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if (elf_compress (scn, 0, 0) < 0)
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{
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printf ("Couldn't decompress section %zd: %s\n", ndx, elf_errmsg (-1));
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exit (1);
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}
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print_strings ();
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if (elf_end (elf) != 0)
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{
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printf ("failure in elf_end: %s\n", elf_errmsg (-1));
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exit (1);
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}
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close (fd);
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return 0;
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}
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