ext/libelf/elf_getident.c

/*-
 * Copyright (c) 2006 Joseph Koshy
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */


#include <ar.h>
#include <assert.h>
#include "libelf.h"

#include "_libelf.h"

char *
elf_getident(Elf *e, size_t *sz)
{

        if (e == NULL) {
                LIBELF_SET_ERROR(ARGUMENT, 0);
                goto error;
        }

        if (e->e_cmd == ELF_C_WRITE && e->e_rawfile == NULL) {
                LIBELF_SET_ERROR(SEQUENCE, 0);
                goto error;
        }

        assert(e->e_kind != ELF_K_AR || e->e_cmd == ELF_C_READ);

        if (sz) {
                if (e->e_kind == ELF_K_AR)
                        *sz = SARMAG;
                else if (e->e_kind == ELF_K_ELF)
                        *sz = EI_NIDENT;
                else
                        *sz = e->e_rawsize;
        }

        return (e->e_rawfile);

 error:
        if (sz)
                *sz = 0;
        return (NULL);
}