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86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/* Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
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Ported to standalone by Joel Sherrill jsherril@redstone-emh2.army.mil,
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On-Line Applications Research Corporation.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <unistd.h>
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#include <stddef.h>
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#include "filedesc.h"
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#include <fcntl.h>
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#include <standalone.h>
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/* Read NBYTES into BUF from FD. Return the number read or -1. */
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ssize_t
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__libc_read (int fd, void *buf, size_t nbytes)
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{
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char *buffer = (char *) buf;
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int data;
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int poll;
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__set_errno (0);
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if (nbytes == 0)
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return 0;
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if ( !__FD_Is_valid( fd ) || !__FD_Table[ fd ].in_use )
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{
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__set_errno (EBADF);
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return -1;
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}
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if (buf == NULL)
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{
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__set_errno (EINVAL);
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return -1;
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}
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if ( __FD_Table[ fd ].flags & O_WRONLY ) /* is it write only? */
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{
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__set_errno (EBADF);
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return -1;
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}
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/* If this is a non-blocking fd, then we want to poll the console. */
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poll = ( __FD_Table[ fd ].flags & O_NONBLOCK ) ? 1 : 0;
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/* Read a single character. This is a cheap way to insure that the
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upper layers get every character because _Console_Getc can't timeout
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or otherwise know when to stop. */
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data = _Console_Getc(poll);
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if ( data == -1 ) /* if no data return */
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return -1;
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(void) _Console_Putc(data); /* echo the character */
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if ( data == '\r' ) { /* translate CR -> CR/LF */
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(void) _Console_Putc('\n');
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data = '\n';
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}
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*buffer = data;
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return 1;
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}
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weak_alias (__libc_read, __read)
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weak_alias (__libc_read, read)
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