text: /* Return number of program headers in the ELF file.
     Copyright (C) 2010, 2014, 2015 Red Hat, Inc.
     This file is part of elfutils.
  
     This file is free software; you can redistribute it and/or modify
     it under the terms of either
  
       * the GNU Lesser General Public License as published by the Free
         Software Foundation; either version 3 of the License, or (at
         your option) any later version
  
     or
  
       * the GNU General Public License as published by the Free
         Software Foundation; either version 2 of the License, or (at
         your option) any later version
  
     or both in parallel, as here.
  
     elfutils is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     General Public License for more details.
  
     You should have received copies of the GNU General Public License and
     the GNU Lesser General Public License along with this program.  If
     not, see <http://www.gnu.org/licenses/>.  */
  
  #ifdef HAVE_CONFIG_H
  # include <config.h>
  #endif
  
  #include <assert.h>
  #include <gelf.h>
  #include <stddef.h>
  
  #include "libelfP.h"
  
  
  int
  internal_function
  __elf_getphdrnum_rdlock (Elf *elf, size_t *dst)
  {
   if (unlikely (elf->state.elf64.ehdr == NULL))
     {
       /* Maybe no ELF header was created yet.  */
       __libelf_seterrno (ELF_E_WRONG_ORDER_EHDR);
       return -1;
     }
  
   *dst = (elf->class == ELFCLASS32
  	 ? elf->state.elf32.ehdr->e_phnum
  	 : elf->state.elf64.ehdr->e_phnum);
  
   if (*dst == PN_XNUM)
     {
       const Elf_ScnList *const scns = (elf->class == ELFCLASS32
  				      ? &elf->state.elf32.scns
  				      : &elf->state.elf64.scns);
  
       /* If there are no section headers, perhaps this is really just 65536
  	written without PN_XNUM support.  Either that or it's bad data.  */
  
       if (elf->class == ELFCLASS32)
         {
  	 if (likely (scns->cnt > 0
  		     && elf->state.elf32.scns.data[0].shdr.e32 != NULL))
  	   *dst = scns->data[0].shdr.e32->sh_info;
         }
       else
         {
  	 if (likely (scns->cnt > 0
  		     && elf->state.elf64.scns.data[0].shdr.e64 != NULL))
  	   *dst = scns->data[0].shdr.e64->sh_info;
         }
     }
  
   return 0;
  }
  
  int
  internal_function
  __elf_getphdrnum_chk_rdlock (Elf *elf, size_t *dst)
  {
    int result = __elf_getphdrnum_rdlock (elf, dst);
  
    /* Do some sanity checking to make sure phnum and phoff are consistent.  */
    Elf64_Off off = (elf->class == ELFCLASS32
  		   ? elf->state.elf32.ehdr->e_phoff
  		   : elf->state.elf64.ehdr->e_phoff);
    if (unlikely (off == 0))
      {
        *dst = 0;
        return result;
      }
  
    if (unlikely (off >= elf->maximum_size))
      {
        __libelf_seterrno (ELF_E_INVALID_DATA);
        return -1;
      }
  
    /* Check for too many sections.  */
    size_t phdr_size = (elf->class == ELFCLASS32
  		      ? sizeof (Elf32_Phdr) : sizeof (Elf64_Phdr));
    if (unlikely (*dst > SIZE_MAX / phdr_size))
      {
        __libelf_seterrno (ELF_E_INVALID_DATA);
        return -1;
      }
  
    /* Truncated file?  Don't return more than can be indexed.  */
    if (unlikely (elf->maximum_size - off < *dst * phdr_size))
      *dst = (elf->maximum_size - off) / phdr_size;
  
    return result;
  }
  
  int
  elf_getphdrnum (Elf *elf, size_t *dst)
  {
    int result;
  
    if (elf == NULL)
      return -1;
  
    if (unlikely (elf->kind != ELF_K_ELF))
      {
        __libelf_seterrno (ELF_E_INVALID_HANDLE);
        return -1;
      }
  
    rwlock_rdlock (elf->lock);
    result = __elf_getphdrnum_chk_rdlock (elf, dst);
    rwlock_unlock (elf->lock);
  
    return result;
  }
  