getident.c

linux下基于c++的处理器仿真平台。具有处理器流水线

/*
getident.c - implementation of the elf_getident(3) function.
Copyright (C) 1995 - 1998 Michael Riepe <[e-mail]>

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

This library 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

#include <private.h>

#ifndef lint
static const char rcsid[] = "@(#) $Id: getident.c,v 1.3 1998/06/12 19:42:26 michael Exp $";
#endif /* lint */

char*
elf_getident(Elf *elf, size_t *ptr) {
    size_t tmp;

    if (!ptr) {
	ptr = &tmp;
    }
    if (!elf) {
	*ptr = 0;
	return NULL;
    }
    elf_assert(elf->e_magic == ELF_MAGIC);
    if (elf->e_kind != ELF_K_ELF) {
	*ptr = elf->e_idlen;
	return elf->e_data;
    }
    if (elf->e_ehdr || _elf_cook(elf)) {
	*ptr = elf->e_idlen;
	return elf->e_ehdr;
    }
    *ptr = 0;
    return NULL;
}