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Add support for Visual Studio 2019
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Marius Greuel
253
external/libelf/src/nlist.c
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253
external/libelf/src/nlist.c
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/*
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* nlist.c - implementation of the nlist(3) function.
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* Copyright (C) 1995 - 2004 Michael Riepe
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <private.h>
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#include <nlist.h>
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#ifndef lint
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static const char rcsid[] = "@(#) $Id: nlist.c,v 1.15 2008/05/23 08:15:35 michael Exp $";
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#endif /* lint */
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#if !defined(_WIN32)
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#if HAVE_FCNTL_H
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#include <fcntl.h>
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#else
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extern int open();
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#endif /* HAVE_FCNTL_H */
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#endif /* defined(_WIN32) */
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#ifndef O_RDONLY
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#define O_RDONLY 0
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#endif /* O_RDONLY */
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif /* O_BINARY */
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#define FILE_OPEN_MODE (O_RDONLY | O_BINARY)
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#define PRIME 217
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struct hash {
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const char* name;
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unsigned long hash;
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unsigned next;
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};
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static const char*
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symbol_name(Elf *elf, const void *syms, const char *names, size_t nlimit, size_t index) {
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size_t off;
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if (elf->e_class == ELFCLASS32) {
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off = ((Elf32_Sym*)syms)[index].st_name;
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}
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#if __LIBELF64
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else if (elf->e_class == ELFCLASS64) {
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off = ((Elf64_Sym*)syms)[index].st_name;
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}
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#endif /* __LIBELF64 */
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else {
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return NULL;
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}
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if (off >= 0 && off < nlimit) {
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return &names[off];
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}
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return NULL;
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}
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static void
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copy_symbol(Elf *elf, struct nlist *np, const void *syms, size_t index) {
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if (elf->e_class == ELFCLASS32) {
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np->n_value = ((Elf32_Sym*)syms)[index].st_value;
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np->n_scnum = ((Elf32_Sym*)syms)[index].st_shndx;
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}
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#if __LIBELF64
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else if (elf->e_class == ELFCLASS64) {
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np->n_value = ((Elf64_Sym*)syms)[index].st_value;
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np->n_scnum = ((Elf64_Sym*)syms)[index].st_shndx;
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}
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#endif /* __LIBELF64 */
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/*
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* this needs more work
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*/
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np->n_type = 0;
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np->n_sclass = 0;
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np->n_numaux = 0;
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}
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static int
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_elf_nlist(Elf *elf, struct nlist *nl) {
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unsigned first[PRIME];
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Elf_Scn *symtab = NULL;
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Elf_Scn *strtab = NULL;
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Elf_Data *symdata;
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Elf_Data *strdata;
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size_t symsize;
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size_t nsymbols;
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const char *name;
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struct hash *table;
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unsigned long hash;
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unsigned i;
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struct nlist *np;
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/*
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* Get and translate ELF header, section table and so on.
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* Must be class independent, so don't use elf32_get*().
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*/
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if (elf->e_kind != ELF_K_ELF) {
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return -1;
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}
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if (!elf->e_ehdr && !_elf_cook(elf)) {
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return -1;
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}
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/*
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* Find symbol table. If there is none, try dynamic symbols.
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*/
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for (symtab = elf->e_scn_1; symtab; symtab = symtab->s_link) {
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if (symtab->s_type == SHT_SYMTAB) {
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break;
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}
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if (symtab->s_type == SHT_DYNSYM) {
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strtab = symtab;
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}
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}
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if (!symtab && !(symtab = strtab)) {
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return -1;
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}
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/*
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* Get associated string table.
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*/
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i = 0;
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if (elf->e_class == ELFCLASS32) {
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i = symtab->s_shdr32.sh_link;
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}
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#if __LIBELF64
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else if (elf->e_class == ELFCLASS64) {
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i = symtab->s_shdr64.sh_link;
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}
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#endif /* __LIBELF64 */
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if (i == 0) {
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return -1;
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}
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for (strtab = elf->e_scn_1; strtab; strtab = strtab->s_link) {
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if (strtab->s_index == i) {
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break;
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}
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}
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if (!strtab || strtab->s_type != SHT_STRTAB) {
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return -1;
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}
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/*
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* Get and translate section data.
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*/
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symdata = elf_getdata(symtab, NULL);
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strdata = elf_getdata(strtab, NULL);
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if (!symdata || !strdata) {
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return -1;
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}
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symsize = _msize(elf->e_class, _elf_version, ELF_T_SYM);
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elf_assert(symsize);
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nsymbols = symdata->d_size / symsize;
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if (!symdata->d_buf || !strdata->d_buf || !nsymbols || !strdata->d_size) {
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return -1;
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}
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/*
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* Build a simple hash table.
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*/
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if (!(table = (struct hash*)malloc(nsymbols * sizeof(*table)))) {
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return -1;
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}
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for (i = 0; i < PRIME; i++) {
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first[i] = 0;
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}
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for (i = 0; i < nsymbols; i++) {
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table[i].name = NULL;
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table[i].hash = 0;
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table[i].next = 0;
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}
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for (i = 1; i < nsymbols; i++) {
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name = symbol_name(elf, symdata->d_buf, strdata->d_buf,
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strdata->d_size, i);
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if (name == NULL) {
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free(table);
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return -1;
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}
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if (*name != '\0') {
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table[i].name = name;
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table[i].hash = elf_hash((unsigned char*)name);
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hash = table[i].hash % PRIME;
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table[i].next = first[hash];
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first[hash] = i;
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}
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}
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/*
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* Lookup symbols, one by one.
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*/
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for (np = nl; (name = np->n_name) && *name; np++) {
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hash = elf_hash((unsigned char*)name);
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for (i = first[hash % PRIME]; i; i = table[i].next) {
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if (table[i].hash == hash && !strcmp(table[i].name, name)) {
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break;
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}
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}
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if (i) {
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copy_symbol(elf, np, symdata->d_buf, i);
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}
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else {
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np->n_value = 0;
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np->n_scnum = 0;
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np->n_type = 0;
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np->n_sclass = 0;
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np->n_numaux = 0;
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}
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}
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free(table);
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return 0;
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}
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int
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nlist(const char *filename, struct nlist *nl) {
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int result = -1;
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unsigned oldver;
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Elf *elf;
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int fd;
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if ((oldver = elf_version(EV_CURRENT)) != EV_NONE) {
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if ((fd = open(filename, FILE_OPEN_MODE)) != -1) {
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if ((elf = elf_begin(fd, ELF_C_READ, NULL))) {
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result = _elf_nlist(elf, nl);
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elf_end(elf);
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}
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close(fd);
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}
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elf_version(oldver);
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}
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if (result) {
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while (nl->n_name && *nl->n_name) {
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nl->n_value = 0;
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nl++;
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}
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}
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return result;
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}
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