This is libstand; a support library for standalone executables (eg. bootstrap

modules).
Obtained from: NetBSD, with some architectural changes and many additions.

1 files changed, 137 insertions, 0 deletions

diff --git a/lib/libstand/open.c b/lib/libstand/open.c
new file mode 100644
index 0000000..a3df60a
--- /dev/null
+++ b/lib/libstand/open.c
@@ -0,0 +1,137 @@
+/*	$NetBSD: open.c,v 1.16 1997/01/28 09:41:03 pk Exp $	*/
+
+/*-
+ * Copyright (c) 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * The Mach Operating System project at Carnegie-Mellon University.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)open.c	8.1 (Berkeley) 6/11/93
+ *  
+ *
+ * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University
+ * All Rights Reserved.
+ *
+ * Author: Alessandro Forin
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie the
+ * rights to redistribute these changes.
+ */
+
+#include "stand.h"
+
+struct open_file files[SOPEN_MAX];
+
+static int
+o_gethandle(void) 
+{
+    int		fd;
+    
+    for (fd = 0; fd < SOPEN_MAX; fd++)
+	if (files[fd].f_flags == 0)
+	    return(fd);
+    return(-1);
+}
+
+
+int
+open(const char *fname, int mode)
+{
+    struct open_file	*f;
+    int			fd, i, error, besterror;
+    char		*file;
+
+    if ((fd = o_gethandle()) == -1) {
+	errno = EMFILE;
+	return(-1);
+    }
+
+    f = &files[fd];
+    f->f_flags = mode + 1;
+    f->f_dev = (struct devsw *)0;
+    f->f_ops = (struct fs_ops *)0;
+    f->f_offset = 0;
+    f->f_devdata = NULL;
+    file = (char *)0;
+    error = devopen(f, fname, &file);
+    if (error ||
+	(((f->f_flags & F_NODEV) == 0) && f->f_dev == (struct devsw *)0))
+	goto err;
+
+    /* see if we opened a raw device; otherwise, 'file' is the file name. */
+    if (file == (char *)0 || *file == '\0') {
+	f->f_flags |= F_RAW;
+	return (fd);
+    }
+
+    /* pass file name to the different filesystem open routines */
+    besterror = ENOENT;
+    for (i = 0; file_system[i] != NULL; i++) {
+
+	error = ((*file_system[i]).fo_open)(file, f);
+	if (error == 0) {
+	    
+	    f->f_ops = file_system[i];
+	    return (fd);
+	}
+	if (error != EINVAL)
+	    besterror = error;
+    }
+    error = besterror;
+
+    if ((f->f_flags & F_NODEV) == 0)
+	f->f_dev->dv_close(f);
+    if (error)
+	devclose(f);
+
+ err:
+    f->f_flags = 0;
+    errno = error;
+    return (-1);
+}