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/*
* Copyright 2001, 2002, 2003 David Mansfield and Cobite, Inc.
* See COPYING file for license information
*/
#include <stdio.h>
#ifdef WIN32
#include <io.h>
#else
#include <unistd.h>
#endif
#include <errno.h>
#include "sio.h"
#include "rcsid.h"
RCSID("$Id: sio.c,v 1.5 2001/10/25 18:36:11 adam Exp $");
ssize_t readn(int fd, void *buf, size_t len)
{
int nleft,nread;
nleft = len;
while (nleft > 0)
{
nread = read(fd,buf,nleft);
/* there is an issue which EINTR which could leave us a bit haywire
* if we get a signal after having read some bytes. special handling
* N.B: we *do* return EINTR if no data has been read yet (thanks Karl)
*/
if (nread < 0)
{
if (errno == EINTR && nleft != (int)len)
continue;
else
return (nread);
}
else if (nread == 0)
break;
nleft -= nread;
if (nleft)
buf = ((char *)buf) + nread;
}
return (len - nleft);
}
ssize_t writen(int fd, const void *buf, size_t len)
{
int nleft, nwritten;
nleft = len;
while (nleft > 0)
{
nwritten = write(fd,buf,nleft);
/* there is an issue with EINTR if we have already written
a few bytes! return if we have not written any yet */
if (nwritten < 0 && errno == EINTR)
{
if (nleft == (int)len)
return nwritten;
continue;
}
if (nwritten <= 0)
return nwritten;
nleft -= nwritten;
if (nleft)
buf = ((char *)buf) + nwritten;
}
return (len - nleft);
}
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