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1 : : /* Returns the file name and build ID stored in the .gnu_altdebuglink if found. 2 : : Copyright (C) 2014 Red Hat, Inc. 3 : : This file is part of elfutils. 4 : : 5 : : This file is free software; you can redistribute it and/or modify 6 : : it under the terms of either 7 : : 8 : : * the GNU Lesser General Public License as published by the Free 9 : : Software Foundation; either version 3 of the License, or (at 10 : : your option) any later version 11 : : 12 : : or 13 : : 14 : : * the GNU General Public License as published by the Free 15 : : Software Foundation; either version 2 of the License, or (at 16 : : your option) any later version 17 : : 18 : : or both in parallel, as here. 19 : : 20 : : elfutils is distributed in the hope that it will be useful, but 21 : : WITHOUT ANY WARRANTY; without even the implied warranty of 22 : : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 23 : : General Public License for more details. 24 : : 25 : : You should have received copies of the GNU General Public License and 26 : : the GNU Lesser General Public License along with this program. If 27 : : not, see <http://www.gnu.org/licenses/>. */ 28 : : 29 : : #ifdef HAVE_CONFIG_H 30 : : # include <config.h> 31 : : #endif 32 : : 33 : : #include "libdwelfP.h" 34 : : 35 : : ssize_t 36 : 5606 : dwelf_dwarf_gnu_debugaltlink (Dwarf *dwarf, 37 : : const char **name_p, 38 : : const void **build_idp) 39 : : { 40 : 5606 : Elf_Data *data = dwarf->sectiondata[IDX_gnu_debugaltlink]; 41 [ + + ]: 5606 : if (data == NULL) 42 : : { 43 : : return 0; 44 : : } 45 : : 46 : 117 : const void *ptr = memchr (data->d_buf, '\0', data->d_size); 47 [ - + ]: 117 : if (ptr == NULL) 48 : : { 49 : 0 : __libdw_seterrno (DWARF_E_INVALID_ELF); 50 : 0 : return -1; 51 : : } 52 : 117 : size_t build_id_len = data->d_size - (ptr - data->d_buf + 1); 53 [ - + ]: 117 : if (build_id_len == 0 || (size_t) (ssize_t) build_id_len != build_id_len) 54 : : { 55 : 0 : __libdw_seterrno (DWARF_E_INVALID_ELF); 56 : 0 : return -1; 57 : : } 58 : 117 : *name_p = data->d_buf; 59 : 117 : *build_idp = ptr + 1; 60 : 117 : return build_id_len; 61 : : } 62 : : INTDEF(dwelf_dwarf_gnu_debugaltlink)