minix/commands/autil/rd_bytes.c
2010-05-31 20:00:08 +00:00

35 lines
742 B
C

/*
* (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;
}
}