/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* lib/krb5/os/net_read.c
*
* Copyright 1987, 1988, 1990 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*/
#include "k5-int.h"
/*
* krb5_net_read() reads from the file descriptor "fd" to the buffer
* "buf", until either 1) "len" bytes have been read or 2) cannot
* read anymore from "fd". It returns the number of bytes read
* or a read() error. (The calling interface is identical to
* read(2).)
*
* XXX must not use non-blocking I/O
*/
int
krb5_net_read(krb5_context context, int fd, register char *buf, register int len)
{
int cc, len2 = 0;
do {
cc = SOCKET_READ((SOCKET)fd, buf, len);
if (cc < 0) {
if (SOCKET_ERRNO == SOCKET_EINTR)
continue;
/* XXX this interface sucks! */
errno = SOCKET_ERRNO;
return(cc); /* errno is already set */
}
else if (cc == 0) {
return(len2);
} else {
buf += cc;
len2 += cc;
len -= cc;
}
} while (len > 0);
return(len2);
}