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/*
* netread.c
*
* Copyright 1987, 1988 by the Massachusetts Institute of Technology.
*
* For copying and distribution information, please see the file
* <mit-copyright.h>.
*/
#include "mit-copyright.h"
#include <errno.h>
#define DEFINE_SOCKADDR
#include "krb.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifndef _WINDOWS
extern int errno;
#endif
/*
* krb_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
krb_net_read(fd, buf, len)
int fd;
register char *buf;
register int len;
{
int cc, len2 = 0;
do {
cc = SOCKET_READ(fd, buf, len);
if (cc < 0)
{
if (SOCKET_ERRNO == SOCKET_EINTR)
continue;
return(cc); /* errno is already set */
}
else if (cc == 0) {
return(len2);
} else {
buf += cc;
len2 += cc;
len -= cc;
}
} while (len > 0);
return(len2);
}
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