/*input.c - low-level input for libelf.Copyright (C) 1995 - 2001 Michael Riepe <michael@stud.uni-hannover.de>This library is free software; you can redistribute it and/ormodify it under the terms of the GNU Library General PublicLicense as published by the Free Software Foundation; eitherversion 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 ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNULibrary General Public License for more details.You should have received a copy of the GNU Library General PublicLicense along with this library; if not, write to the Free SoftwareFoundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.*/#include <private.h>#ifndef lintstatic const char rcsid[] = "@(#) $Id: input.c,v 1.6 2001/10/15 21:38:29 michael Exp $";#endif /* lint */#if HAVE_MMAP#include <sys/mman.h>#endif /* HAVE_MMAP */void*_elf_read(Elf *elf, void *buffer, size_t off, size_t len) {    void *tmp;    elf_assert(elf);    elf_assert(elf->e_magic == ELF_MAGIC);    elf_assert(off >= 0 && off + len <= elf->e_size);    if (elf->e_disabled) {	seterr(ERROR_FDDISABLED);    }    else if (len) {	off += elf->e_base;	if (lseek(elf->e_fd, (off_t)off, SEEK_SET) != (off_t)off) {	    seterr(ERROR_IO_SEEK);	}	else if (!(tmp = buffer) && !(tmp = malloc(len))) {	    seterr(ERROR_IO_2BIG);	}	else if (read(elf->e_fd, tmp, len) != (int)len) {	    seterr(ERROR_IO_READ);	    if (tmp != buffer) {		free(tmp);	    }	}	else {	    return tmp;	}    }    return NULL;}void*_elf_mmap(Elf *elf) {#if HAVE_MMAP    void *tmp;    elf_assert(elf);    elf_assert(elf->e_magic == ELF_MAGIC);    elf_assert(elf->e_base == 0);    if (elf->e_disabled) {	seterr(ERROR_FDDISABLED);    }    else if (elf->e_size) {	tmp = (void*)mmap(0, elf->e_size, PROT_READ | PROT_WRITE,			  MAP_PRIVATE, elf->e_fd, 0);	if (tmp != (void*)-1) {	    return tmp;	}    }#endif /* HAVE_MMAP */    return NULL;}