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1 : : /* Get next section. 2 : : Copyright (C) 1998, 1999, 2000, 2001, 2002, 2015 Red Hat, Inc. 3 : : This file is part of elfutils. 4 : : Contributed by Ulrich Drepper <drepper@redhat.com>, 1998. 5 : : 6 : : This file is free software; you can redistribute it and/or modify 7 : : it under the terms of either 8 : : 9 : : * the GNU Lesser General Public License as published by the Free 10 : : Software Foundation; either version 3 of the License, or (at 11 : : your option) any later version 12 : : 13 : : or 14 : : 15 : : * the GNU General Public License as published by the Free 16 : : Software Foundation; either version 2 of the License, or (at 17 : : your option) any later version 18 : : 19 : : or both in parallel, as here. 20 : : 21 : : elfutils is distributed in the hope that it will be useful, but 22 : : WITHOUT ANY WARRANTY; without even the implied warranty of 23 : : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 24 : : General Public License for more details. 25 : : 26 : : You should have received copies of the GNU General Public License and 27 : : the GNU Lesser General Public License along with this program. If 28 : : not, see <http://www.gnu.org/licenses/>. */ 29 : : 30 : : #ifdef HAVE_CONFIG_H 31 : : # include <config.h> 32 : : #endif 33 : : 34 : : #include <assert.h> 35 : : #include <libelf.h> 36 : : #include <stddef.h> 37 : : 38 : : #include "libelfP.h" 39 : : 40 : : 41 : : Elf_Scn * 42 : 9433233 : elf_nextscn (Elf *elf, Elf_Scn *scn) 43 : : { 44 : 9433233 : Elf_ScnList *list; 45 : 9433233 : Elf_Scn *result = NULL; 46 : : 47 [ + - ]: 9433233 : if (elf == NULL) 48 : : return NULL; 49 : : 50 : 9433233 : rwlock_rdlock (elf->lock); 51 : : 52 [ + + ]: 9433233 : if (scn == NULL) 53 : : { 54 : : /* If no section handle is given return the first (not 0th) section. 55 : : Set scn to the 0th section and perform nextscn. */ 56 : 39552 : if (elf->class == ELFCLASS32 57 : : || (offsetof (Elf, state.elf32.scns) 58 : : == offsetof (Elf, state.elf64.scns))) 59 : 39552 : list = &elf->state.elf32.scns; 60 : : else 61 : : list = &elf->state.elf64.scns; 62 : : 63 : 39552 : scn = &list->data[0]; 64 : : } 65 : : else 66 : 9393681 : list = scn->list; 67 : : 68 [ + + ]: 9433233 : if (scn + 1 < &list->data[list->cnt]) 69 : : result = scn + 1; 70 [ + + ]: 25508 : else if (scn + 1 == &list->data[list->max] 71 [ + + ]: 24464 : && (list = list->next) != NULL) 72 : : { 73 : : /* If there is another element in the section list it must 74 : : have at least one entry. */ 75 [ - + ]: 778 : assert (list->cnt > 0); 76 : 778 : result = &list->data[0]; 77 : : } 78 : : 79 : : rwlock_unlock (elf->lock); 80 : : 81 : : return result; 82 : : } 83 : : INTDEF(elf_nextscn)