minix/commands/aal/rd_bytes.c

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2005-04-21 16:53:53 +02:00
/* $Header$ */
/*
* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
* See the copyright notice in the ACK home directory, in the file "Copyright".
*/
#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".
*/
int
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;
}
}