mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 23:40:10 +00:00
88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/* Copyright (C) 1994, 1995 Free Software Foundation, Inc.
|
|
Ported to standalone by Joel Sherrill jsherril@redstone-emh2.army.mil,
|
|
On-Line Applications Research Corporation.
|
|
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
#include <ansidecl.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <stddef.h>
|
|
|
|
#include "filedesc.h"
|
|
#include <fcntl.h>
|
|
#include <standalone.h>
|
|
|
|
/* Read NBYTES into BUF from FD. Return the number read or -1. */
|
|
ssize_t
|
|
DEFUN(__read, (fd, buf, nbytes),
|
|
int fd AND PTR buf AND size_t nbytes)
|
|
{
|
|
char *buffer = (char *) buf;
|
|
int data;
|
|
int poll;
|
|
|
|
errno = 0;
|
|
|
|
if (nbytes == 0)
|
|
return 0;
|
|
|
|
if ( !__FD_Is_valid( fd ) || !__FD_Table[ fd ].in_use )
|
|
{
|
|
errno = EBADF;
|
|
return -1;
|
|
}
|
|
if (buf == NULL)
|
|
{
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
if ( __FD_Table[ fd ].flags & O_WRONLY ) /* is it write only? */
|
|
{
|
|
errno = EBADF;
|
|
return -1;
|
|
}
|
|
|
|
/* If this is a non-blocking fd, then we want to poll the console. */
|
|
|
|
poll = ( __FD_Table[ fd ].flags & O_NONBLOCK ) ? 1 : 0;
|
|
|
|
/* Read a single character. This is a cheap way to insure that the
|
|
upper layers get every character because _Console_Getc can't timeout
|
|
or otherwise know when to stop. */
|
|
|
|
|
|
data = _Console_Getc(poll);
|
|
|
|
if ( data == -1 ) /* if no data return */
|
|
return -1;
|
|
|
|
(void) _Console_Putc(data); /* echo the character */
|
|
|
|
if ( data == '\r' ) { /* translate CR -> CR/LF */
|
|
(void) _Console_Putc('\n');
|
|
data = '\n';
|
|
}
|
|
|
|
*buffer = data;
|
|
return 1;
|
|
}
|
|
|
|
weak_alias (__read, read)
|