mirror of
https://github.com/jart/cosmopolitan.git
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59 lines
3.1 KiB
C
59 lines
3.1 KiB
C
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/elf/elf.h"
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#include "libc/elf/scalar.h"
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#include "libc/elf/struct/ehdr.h"
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#include "libc/elf/struct/sym.h"
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/**
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* Returns pointer to array of elf symbols.
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*
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* This is a shortcut composing GetElfSymbolTable() and
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* GetElfSectionAddress(), that can be used as follows:
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*
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* Elf64_Xword i, n;
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* Elf64_Sym *st = GetElfSymbols(map, size, SHT_SYMTAB, &n);
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* for (i = 0; st && i < n; ++i) {
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* // st[i] holds a symbol
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* }
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*
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* The above code will iterate over the relocatable and/or
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* statically-linked symbols defined by an ELF image.
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*
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* @param elf points to the start of the executable image data
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* @param mapsize is the number of bytes past `elf` we can access
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* @param section_type is usually `SHT_SYMTAB` or `SHT_DYNSYM`
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* @param out_count optionally receives number of symbols
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* @return pointer to array of elf symbol array, otherwise null
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*/
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Elf64_Sym *GetElfSymbols(const Elf64_Ehdr *elf, //
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size_t mapsize, //
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int section_type, //
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Elf64_Xword *out_count) {
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Elf64_Sym *syms;
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Elf64_Xword count;
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if ((syms = GetElfSectionAddress(
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elf, mapsize,
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GetElfSymbolTable(elf, mapsize, section_type, &count))) &&
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out_count) {
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*out_count = count;
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}
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return syms;
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}
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