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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /sysdeps/standalone/read.c
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initial import
Diffstat (limited to 'sysdeps/standalone/read.c')
-rw-r--r--sysdeps/standalone/read.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/sysdeps/standalone/read.c b/sysdeps/standalone/read.c
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+/* 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)