/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8                               :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2023 Justine Alexandra Roberts Tunney                              │
│                                                                              │
│ Permission to use, copy, modify, and/or distribute this software for         │
│ any purpose with or without fee is hereby granted, provided that the         │
│ above copyright notice and this permission notice appear in all copies.      │
│                                                                              │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
│ PERFORMANCE OF THIS SOFTWARE.                                                │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/elf/elf.h"
#include "libc/elf/struct/ehdr.h"
#include "libc/elf/struct/shdr.h"
#include "libc/str/str.h"

/**
 * Returns ELF section header for section with name.
 *
 * @param elf points to the start of the executable image data
 * @param mapsize is the number of bytes past `elf` we can access
 * @return pointer to section header within image, or null
 */
Elf64_Shdr *FindElfSectionByName(const Elf64_Ehdr *elf, size_t mapsize,
                                 char *shdrstrtab, const char *name) {
  long i;
  Elf64_Shdr *shdr;
  const char *secname;
  if (shdrstrtab) {
    for (i = 0; i < elf->e_shnum; ++i) {
      if ((shdr = GetElfSectionHeaderAddress(elf, mapsize, i)) &&
          (secname = GetElfString(elf, mapsize, shdrstrtab, shdr->sh_name)) &&
          !strcmp(name, secname)) {
        return shdr;
      }
    }
  }
  return 0;
}
