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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
48 lines
3 KiB
C
48 lines
3 KiB
C
/*-*- 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/def.h"
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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/shdr.h"
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/**
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* Returns section header object at `elf.section[i]`.
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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 i is the index of the section header
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* @return pointer to section header within image, or null if
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* 1. `i` was a magic number, i.e. `i >= SHN_LORESERVE`, or
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* 2. `e_shoff` was zero (image has no section headers), or
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* 3. `e_shentsize` had fewer than the mandatory 60 bytes, or
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* 4. section header wasn't contained by `[elf,elf+mapsize)`, or
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* 5. an arithmetic overflow occurred
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*/
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Elf64_Shdr *GetElfSectionHeaderAddress(const Elf64_Ehdr *elf, //
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size_t mapsize, //
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Elf64_Half i) { //
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Elf64_Off off;
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if (i >= SHN_LORESERVE) return 0;
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if (i >= elf->e_shnum) return 0;
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if (elf->e_shoff <= 0) return 0;
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if (elf->e_shoff >= mapsize) return 0;
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if (elf->e_shentsize < sizeof(Elf64_Shdr)) return 0;
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if ((off = elf->e_shoff + (unsigned)i * elf->e_shentsize) > mapsize) return 0;
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return (Elf64_Shdr *)((char *)elf + off);
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}
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