source: trunk/minix/commands/autil/rd_bytes.c@ 11

/* $Id: rd_bytes.c,v 1.1 2005/06/23 09:50:54 philip Exp $ */
/*
 * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
 * See the copyright notice in the ACK home directory, in the file "Copyright".
 */

#include "obj.h"

#define MININT          (1 << (sizeof(int) * 8 - 1))
#define MAXCHUNK        (~MININT)       /* Highest count we read(2).    */
/* Unfortunately, MAXCHUNK is too large with some  compilers. Put it in
   an int!
*/

static int maxchunk = MAXCHUNK;

/*
 * We don't have to worry about byte order here.
 * Just read "cnt" bytes from file-descriptor "fd".
 */
void 
rd_bytes(fd, string, cnt)
        register char   *string;
        register long   cnt;
{

        while (cnt) {
                register int n = cnt >= maxchunk ? maxchunk : cnt;

                if (read(fd, string, n) != n)
                        rd_fatal();
                string += n;
                cnt -= n;
        }
}